Merge branch 'master' into hyphenation-v2

.github/workflows/ci.yml

@@ -12,12 +12,6 @@ jobs:
       - uses: actions/checkout@v6
         with:
           submodules: recursive
-      - uses: actions/cache@v5
-        with:
-          path: |
-            ~/.cache/pip
-            ~/.platformio/.cache
-          key: ${{ runner.os }}-pio
       - uses: actions/setup-python@v6
         with:
           python-version: '3.14'

README.md

@@ -25,7 +25,7 @@ This project is **not affiliated with Xteink**; it's built as a community projec
 
 ## Features & Usage
 
-- [x] EPUB parsing and rendering
+- [x] EPUB parsing and rendering (EPUB 2 and EPUB 3)
 - [ ] Image support within EPUB
 - [x] Saved reading position
 - [x] File explorer with file picker
@@ -33,11 +33,13 @@ This project is **not affiliated with Xteink**; it's built as a community projec
   - [x] Support nested folders
   - [ ] EPUB picker with cover art
 - [x] Custom sleep screen
-  - [ ] Cover sleep screen
+  - [x] Cover sleep screen
 - [x] Wifi book upload
-- [ ] Wifi OTA updates
+- [x] Wifi OTA updates
-- [ ] Configurable font, layout, and display options
+- [x] Configurable font, layout, and display options
-- [ ] Screen rotation
+  - [ ] User provided fonts
+  - [ ] Full UTF support
+- [x] Screen rotation
 
 See [the user guide](./USER_GUIDE.md) for instructions on operating CrossPoint.
 
@@ -98,9 +100,9 @@ CrossPoint Reader is pretty aggressive about caching data down to the SD card to
 has ~380KB of usable RAM, so we have to be careful. A lot of the decisions made in the design of the firmware were based
 on this constraint.
 
-### EPUB caching
+### Data caching
 
-The first time chapters of an EPUB are loaded, they are cached to the SD card. Subsequent loads are served from the 
+The first time chapters of a book are loaded, they are cached to the SD card. Subsequent loads are served from the 
 cache. This cache directory exists at `.crosspoint` on the SD card. The structure is as follows:
 
 
@@ -108,25 +110,22 @@ cache. This cache directory exists at `.crosspoint` on the SD card. The structur
 .crosspoint/
 ├── epub_12471232/       # Each EPUB is cached to a subdirectory named `epub_<hash>`
 │   ├── progress.bin     # Stores reading progress (chapter, page, etc.)
-│   ├── 0/               # Each chapter is stored in a subdirectory named by its index (based on the spine order)
+│   ├── cover.bmp        # Book cover image (once generated)
-│   │   ├── section.bin  # Section metadata (page count)
+│   ├── book.bin         # Book metadata (title, author, spine, table of contents, etc.)
-│   │   ├── page_0.bin   # Each page is stored in a separate file, it
+│   └── sections/        # All chapter data is stored in the sections subdirectory
-│   │   ├── page_1.bin   #   contains the position (x, y) and text for each word
+│       ├── 0.bin        # Chapter data (screen count, all text layout info, etc.)
-│   │   └── ...
+│       ├── 1.bin        #     files are named by their index in the spine
-│   ├── 1/
+│       └── ...
-│   │   ├── section.bin
-│   │   ├── page_0.bin
-│   │   ├── page_1.bin
-│   │   └── ...
-│   └── ...
 │
 └── epub_189013891/
 ```
 
-Deleting the `.crosspoint` directory will clear the cache. 
+Deleting the `.crosspoint` directory will clear the entire cache. 
 
-Due the way it's currently implemented, the cache is not automatically cleared when the EPUB is deleted and moving an 
+Due the way it's currently implemented, the cache is not automatically cleared when a book is deleted and moving a book
-EPUB file will reset the reading progress.
+file will use a new cache directory, resetting the reading progress.
+
+For more details on the internal file structures, see the [file formats document](./docs/file-formats.md).
 
 ## Contributing
 

USER_GUIDE.md

@@ -5,7 +5,7 @@ the device.
 
 ## 1. Hardware Overview
 
-The device utilises the standard buttons on the Xtink X4 in the same layout:
+The device utilises the standard buttons on the Xtink X4 (in the same layout as the manufacturer firmware, by default):
 
 ### Button Layout
 | Location        | Buttons                                    |
@@ -13,20 +13,23 @@ The device utilises the standard buttons on the Xtink X4 in the same layout:
 | **Bottom Edge** | **Back**, **Confirm**, **Left**, **Right** |
 | **Right Side**  | **Power**, **Volume Up**, **Volume Down**  |
 
+Button layout can be customized in **[Settings](#35-settings)**.
+
 ---
 
 ## 2. Power & Startup
 
 ### Power On / Off
 
-To turn the device on or off, **press and hold the Power button for half a second**. In **Settings** you can configure
+To turn the device on or off, **press and hold the Power button for half a second**. In **[Settings](#35-settings)** you can configure
 the power button to trigger on a short press instead of a long one.
 
 ### First Launch
 
-Upon turning the device on for the first time, you will be placed on the **Home** screen.
+Upon turning the device on for the first time, you will be placed on the **[Home](#31-home-screen)** screen.
 
-> **Note:** On subsequent restarts, the firmware will automatically reopen the last book you were reading.
+> [!NOTE]
+> On subsequent restarts, the firmware will automatically reopen the last book you were reading.
 
 ---
 
@@ -34,10 +37,10 @@ Upon turning the device on for the first time, you will be placed on the **Home*
 
 ### 3.1 Home Screen
 
-The Home Screen is the main entry point to the firmware. From here you can navigate to the **Book Selection** screen,
+The Home Screen is the main entry point to the firmware. From here you can navigate to **[Reading Mode](#4-reading-mode)** with the most recently read book, **[Book Selection](#32-book-selection)**,
-**Settings** screen, or **File Upload** screen.
+**[Settings](#35-settings)**, or the **[File Upload](#34-file-upload-screen)** screen.
 
-### 3.2 Book Selection (Read)
+### 3.2 Book Selection
 
 The Book Selection acts as a folder and file browser.
 
@@ -45,13 +48,13 @@ The Book Selection acts as a folder and file browser.
   and down through folders and books.
 * **Open Selection:** Press **Confirm** to open a folder or read a selected book.
 
-### 3.3 Reading Screen
+### 3.3 Reading Mode
 
-See [4. Reading Mode](#4-reading-mode) below for more information.
+See [Reading Mode](#4-reading-mode) below for more information.
 
 ### 3.4 File Upload Screen
 
-The File Upload screen allows you to upload new e-books to the device. When you enter the screen you'll be prompted with
+The File Upload screen allows you to upload new e-books to the device. When you enter the screen, you'll be prompted with
 a WiFi selection dialog and then your X4 will start hosting a web server.
 
 See the [webserver docs](./docs/webserver.md) for more information on how to connect to the web server and upload files.
@@ -62,11 +65,32 @@ The Settings screen allows you to configure the device's behavior. There are a f
 - **Sleep Screen**: Which sleep screen to display when the device sleeps, options are:
   - "Dark" (default) - The default dark sleep screen
   - "Light" - The same default sleep screen, on a white background
-  - "Custom" - Custom images from the SD card, see [3.6 Sleep Screen](#36-sleep-screen) below for more information
+  - "Custom" - Custom images from the SD card, see [Sleep Screen](#36-sleep-screen) below for more information
   - "Cover" - The book cover image (Note: this is experimental and may not work as expected)
+- **Status Bar**: Configure the status bar displayed while reading, options are:
+  - "None" - No status bar
+  - "No Progress" - Show status bar without reading progress
+  - "Full" - Show status bar with reading progress
 - **Extra Paragraph Spacing**: If enabled, vertical space will be added between paragraphs in the book, if disabled,
   paragraphs will not have vertical space between them, but will have first word indentation.
 - **Short Power Button Click**: Whether to trigger the power button on a short press or a long press.
+- **Reading Orientation**: Set the screen orientation for reading, options are:
+  - "Portrait" (default) - Standard portrait orientation
+  - "Landscape CW" - Landscape, rotated clockwise
+  - "Inverted" - Portrait, upside down
+  - "Landscape CCW" - Landscape, rotated counter-clockwise
+- **Front Button Layout**: Configure the order of the bottom edge buttons, options are:
+  - "Bck, Cnfrm, Lft, Rght" (default) - Back, Confirm, Left, Right
+  - "Lft, Rght, Bck, Cnfrm" - Left, Right, Back, Confirm
+  - "Lft, Bck, Cnfrm, Rght" - Left, Back, Confirm, Right
+- **Side Button Layout**: Swap the order of the volume buttons from Previous/Next to Next/Previous. This change is only in effect when reading.
+- **Reader Font Family**: Choose the font used for reading, options are:
+  - "Bookerly" (default) - Amazon's reading font
+  - "Noto Sans" - Google's sans-serif font
+  - "Open Dyslexic" - Font designed for readers with dyslexia
+- **Reader Font Size**: Adjust the text size for reading, options are "Small", "Medium", "Large", or "X Large".
+- **Reader Line Spacing**: Adjust the spacing between lines, options are "Tight", "Normal", or "Wide".
+- **Check for updates**: Check for firmware updates over WiFi.
 
 ### 3.6 Sleep Screen
 
@@ -74,7 +98,7 @@ You can customize the sleep screen by placing custom images in specific location
 
 - **Single Image:** Place a file named `sleep.bmp` in the root directory.
 - **Multiple Images:** Create a `sleep` directory in the root of the SD card and place any number of `.bmp` images
-  inside. If images are found in this directory, they will take priority over the `sleep.png` file, and one will be
+  inside. If images are found in this directory, they will take priority over the `sleep.bmp` file, and one will be
   randomly selected each time the device sleeps.
 
 > [!NOTE]
@@ -102,8 +126,9 @@ Once you have opened a book, the button layout changes to facilitate reading.
 * **Previous Chapter:** Press and **hold** the **Left** (or **Volume Up**) button briefly, then release.
 
 ### System Navigation
-* **Return to Home:** Press **Back** to close the book and return to the Book Selection screen.
+* **Return to Book Selection:** Press **Back** to close the book and return to the **[Book Selection](#32-book-selection)** screen.
-* **Chapter Menu:** Press **Confirm** to open the Table of Contents/Chapter Selection screen.
+* **Return to Home:** Press and hold **Back** to close the book and return to the **[Home](#31-home-screen)** screen.
+* **Chapter Menu:** Press **Confirm** to open the **[Table of Contents/Chapter Selection](#5-chapter-selection-screen)**.
 
 ---
 
@@ -123,5 +148,3 @@ Please note that this firmware is currently in active development. The following
 are planned for future updates:
 
 * **Images:** Embedded images in e-books will not render.
-* **Text Formatting:** There are currently no settings to adjust font type, size, line spacing, or margins.
-* **Rotation**: Different rotation options are not supported.

bin/clang-format-fix

@@ -1,3 +1,19 @@
 #!/bin/bash
 
-find src lib \( -name "*.c" -o -name "*.cpp" -o -name "*.h" -o -name "*.hpp" \) -exec clang-format -style=file -i {} +
+GIT_LS_FILES_FLAGS=""
+if [[ "$1" == "-g" ]]; then
+  GIT_LS_FILES_FLAGS="--modified"
+fi
+
+# --- Main Logic ---
+
+# Format all files (or only modified files if -g is passed)
+
+# Use 'git ls-files' to get a list of all files tracked by git:
+# --modified: files tracked by git that have been modified (staged or unstaged)
+# --exclude-standard: ignores files in .gitignore
+# Additionally exclude files in 'lib/EpdFont/builtinFonts/' as they are script-generated.
+git ls-files  --exclude-standard ${GIT_LS_FILES_FLAGS} \
+    | grep -E '\.(c|cpp|h|hpp)$' \
+    | grep -v -E '^lib/EpdFont/builtinFonts/' \
+    | xargs -r clang-format -style=file -i

docs/file-formats.md

@@ -0,0 +1,221 @@
+# File Formats
+
+## `book.bin`
+
+### Version 3
+
+ImHex Pattern:
+
+```c++
+import std.mem;
+import std.string;
+import std.core;
+
+// === Configuration ===
+#define EXPECTED_VERSION 3
+#define MAX_STRING_LENGTH 65535
+
+// === String Structure ===
+
+struct String {
+    u32 length [[hidden, comment("String byte length")]];
+    if (length > MAX_STRING_LENGTH) {
+        std::warning(std::format("Unusually large string length: {} bytes", length));
+    }
+    char data[length] [[comment("UTF-8 string data")]];
+} [[sealed, format("format_string"), comment("Length-prefixed UTF-8 string")]];
+
+fn format_string(String s) {
+    return s.data;
+};
+
+// === Metadata Structure ===
+
+struct Metadata {
+    String title [[comment("Book title")]];
+    String author [[comment("Book author")]];
+    String coverItemHref [[comment("Path to cover image")]];
+    String textReferenceHref [[comment("Path to guided first text reference")]];
+} [[comment("Book metadata information")]];
+
+// === Spine Entry Structure ===
+
+struct SpineEntry {
+    String href [[comment("Resource path")]];
+    u32 cumulativeSize [[comment("Cumulative size in bytes"), color("FF6B6B")]];
+    s16 tocIndex [[comment("Index into TOC (-1 if none)"), color("4ECDC4")]];
+} [[comment("Spine entry defining reading order")]];
+
+// === TOC Entry Structure ===
+
+struct TocEntry {
+    String title [[comment("Chapter/section title")]];
+    String href [[comment("Resource path")]];
+    String anchor [[comment("Fragment identifier")]];
+    u8 level [[comment("Nesting level (0-255)"), color("95E1D3")]];
+    s16 spineIndex [[comment("Index into spine (-1 if none)"), color("F38181")]];
+} [[comment("Table of contents entry")]];
+
+// === Book Bin Structure ===
+
+struct BookBin {
+    // Header
+    u8 version [[comment("Format version"), color("FFD93D")]];
+    
+    // Version validation
+    if (version != EXPECTED_VERSION) {
+        std::error(std::format("Unsupported version: {} (expected {})", version, EXPECTED_VERSION));
+    }
+    
+    u32 lutOffset [[comment("Offset to lookup tables"), color("6BCB77")]];
+    u16 spineCount [[comment("Number of spine entries"), color("4D96FF")]];
+    u16 tocCount [[comment("Number of TOC entries"), color("FF6B9D")]];
+    
+    // Metadata section
+    Metadata metadata [[comment("Book metadata")]];
+    
+    // Validate LUT offset alignment
+    u32 currentOffset = $;
+    if (currentOffset != lutOffset) {
+        std::warning(std::format("LUT offset mismatch: expected 0x{:X}, got 0x{:X}", lutOffset, currentOffset));
+    }
+    
+    // Lookup Tables
+    u32 spineLut[spineCount] [[comment("Spine entry offsets"), color("4D96FF")]];
+    u32 tocLut[tocCount] [[comment("TOC entry offsets"), color("FF6B9D")]];
+    
+    // Data Entries
+    SpineEntry spines[spineCount] [[comment("Spine entries (reading order)")]];
+    TocEntry toc[tocCount] [[comment("Table of contents entries")]];
+};
+
+// === File Parsing ===
+
+BookBin book @ 0x00;
+
+// Validate we've consumed the entire file
+u32 fileSize = std::mem::size();
+u32 parsedSize = $;
+
+if (parsedSize != fileSize) {
+    std::warning(std::format("Unparsed data detected: {} bytes remaining at offset 0x{:X}", fileSize - parsedSize, parsedSize));
+}
+```
+
+## `section.bin`
+
+### Version 8
+
+ImHex Pattern:
+
+```c++
+import std.mem;
+import std.string;
+import std.core;
+
+// === Configuration ===
+#define EXPECTED_VERSION 8
+#define MAX_STRING_LENGTH 65535
+
+// === String Structure ===
+
+struct String {
+    u32 length [[hidden, comment("String byte length")]];
+    if (length > MAX_STRING_LENGTH) {
+        std::warning(std::format("Unusually large string length: {} bytes", length));
+    }
+    char data[length] [[comment("UTF-8 string data")]];
+} [[sealed, format("format_string"), comment("Length-prefixed UTF-8 string")]];
+
+fn format_string(String s) {
+    return s.data;
+};
+
+// === Page Structure ===
+
+enum StorageType : u8 {
+    PageLine = 1
+};
+
+enum WordStyle : u8 {
+    REGULAR = 0,
+    BOLD = 1,
+    ITALIC = 2,
+    BOLD_ITALIC = 3
+};
+
+enum BlockStyle : u8 {
+    JUSTIFIED = 0,
+    LEFT_ALIGN = 1,
+    CENTER_ALIGN = 2,
+    RIGHT_ALIGN = 3,
+};
+
+struct PageLine {
+  s16 xPos;
+  s16 yPos;
+  u16 wordCount;
+  String words[wordCount];
+  u16 wordXPos[wordCount];
+  WordStyle wordStyle[wordCount];
+  BlockStyle blockStyle;
+};
+
+struct PageElement {
+    u8 pageElementType;
+    if (pageElementType == 1) {
+        PageLine pageLine [[inline]];
+    } else {
+        std::error(std::format("Unknown page element type: {}", pageElementType));
+    }
+};
+
+struct Page {
+    u16 elementCount;
+    PageElement elements[elementCount] [[inline]];
+};
+
+// === Section Bin Structure ===
+
+struct SectionBin {
+    // Header
+    u8 version [[comment("Format version"), color("FFD93D")]];
+    
+    // Version validation
+    if (version != EXPECTED_VERSION) {
+        std::error(std::format("Unsupported version: {} (expected {})", version, EXPECTED_VERSION));
+    }
+    
+    // Cache busting parameters
+    s32 fontId;
+    float lineCompression;
+    bool extraParagraphSpacing;
+    u16 viewportWidth;
+    u16 vieportHeight;
+    u16 pageCount;
+    u32 lutOffset;
+    
+    Page page[pageCount];
+    
+    // Validate LUT offset alignment
+    u32 currentOffset = $;
+    if (currentOffset != lutOffset) {
+        std::warning(std::format("LUT offset mismatch: expected 0x{:X}, got 0x{:X}", lutOffset, currentOffset));
+    }
+    
+    // Lookup Tables
+    u32 lut[pageCount];
+};
+
+// === File Parsing ===
+
+SectionBin book @ 0x00;
+
+// Validate we've consumed the entire file
+u32 fileSize = std::mem::size();
+u32 parsedSize = $;
+
+if (parsedSize != fileSize) {
+    std::warning(std::format("Unparsed data detected: {} bytes remaining at offset 0x{:X}", fileSize - parsedSize, parsedSize));
+}
+```

lib/EpdFont/EpdFont.cpp

@@ -2,8 +2,7 @@
 
 #include <Utf8.h>
 
-inline int min(const int a, const int b) { return a < b ? a : b; }
+#include <algorithm>
-inline int max(const int a, const int b) { return a < b ? b : a; }
 
 void EpdFont::getTextBounds(const char* string, const int startX, const int startY, int* minX, int* minY, int* maxX,
                             int* maxY) const {
@@ -32,10 +31,10 @@ void EpdFont::getTextBounds(const char* string, const int startX, const int star
       continue;
     }
 
-    *minX = min(*minX, cursorX + glyph->left);
+    *minX = std::min(*minX, cursorX + glyph->left);
-    *maxX = max(*maxX, cursorX + glyph->left + glyph->width);
+    *maxX = std::max(*maxX, cursorX + glyph->left + glyph->width);
-    *minY = min(*minY, cursorY + glyph->top - glyph->height);
+    *minY = std::min(*minY, cursorY + glyph->top - glyph->height);
-    *maxY = max(*maxY, cursorY + glyph->top);
+    *maxY = std::max(*maxY, cursorY + glyph->top);
     cursorX += glyph->advanceX;
   }
 }
@@ -59,14 +58,28 @@ bool EpdFont::hasPrintableChars(const char* string) const {
 
 const EpdGlyph* EpdFont::getGlyph(const uint32_t cp) const {
   const EpdUnicodeInterval* intervals = data->intervals;
-  for (int i = 0; i < data->intervalCount; i++) {
+  const int count = data->intervalCount;
-    const EpdUnicodeInterval* interval = &intervals[i];
+
-    if (cp >= interval->first && cp <= interval->last) {
+  if (count == 0) return nullptr;
+
+  // Binary search for O(log n) lookup instead of O(n)
+  // Critical for Korean fonts with many unicode intervals
+  int left = 0;
+  int right = count - 1;
+
+  while (left <= right) {
+    const int mid = left + (right - left) / 2;
+    const EpdUnicodeInterval* interval = &intervals[mid];
+
+    if (cp < interval->first) {
+      right = mid - 1;
+    } else if (cp > interval->last) {
+      left = mid + 1;
+    } else {
+      // Found: cp >= interval->first && cp <= interval->last
       return &data->glyph[interval->offset + (cp - interval->first)];
     }
-    if (cp < interval->first) {
-      return nullptr;
-    }
   }
+
   return nullptr;
 }

lib/EpdFont/EpdFontFamily.cpp

@@ -1,6 +1,6 @@
 #include "EpdFontFamily.h"
 
-const EpdFont* EpdFontFamily::getFont(const EpdFontStyle style) const {
+const EpdFont* EpdFontFamily::getFont(const Style style) const {
   if (style == BOLD && bold) {
     return bold;
   }
@@ -22,16 +22,16 @@ const EpdFont* EpdFontFamily::getFont(const EpdFontStyle style) const {
   return regular;
 }
 
-void EpdFontFamily::getTextDimensions(const char* string, int* w, int* h, const EpdFontStyle style) const {
+void EpdFontFamily::getTextDimensions(const char* string, int* w, int* h, const Style style) const {
   getFont(style)->getTextDimensions(string, w, h);
 }
 
-bool EpdFontFamily::hasPrintableChars(const char* string, const EpdFontStyle style) const {
+bool EpdFontFamily::hasPrintableChars(const char* string, const Style style) const {
   return getFont(style)->hasPrintableChars(string);
 }
 
-const EpdFontData* EpdFontFamily::getData(const EpdFontStyle style) const { return getFont(style)->data; }
+const EpdFontData* EpdFontFamily::getData(const Style style) const { return getFont(style)->data; }
 
-const EpdGlyph* EpdFontFamily::getGlyph(const uint32_t cp, const EpdFontStyle style) const {
+const EpdGlyph* EpdFontFamily::getGlyph(const uint32_t cp, const Style style) const {
   return getFont(style)->getGlyph(cp);
 };

lib/EpdFont/EpdFontFamily.h

@@ -1,24 +1,24 @@
 #pragma once
 #include "EpdFont.h"
 
-enum EpdFontStyle { REGULAR, BOLD, ITALIC, BOLD_ITALIC };
-
 class EpdFontFamily {
+ public:
+  enum Style : uint8_t { REGULAR = 0, BOLD = 1, ITALIC = 2, BOLD_ITALIC = 3 };
+
+  explicit EpdFontFamily(const EpdFont* regular, const EpdFont* bold = nullptr, const EpdFont* italic = nullptr,
+                         const EpdFont* boldItalic = nullptr)
+      : regular(regular), bold(bold), italic(italic), boldItalic(boldItalic) {}
+  ~EpdFontFamily() = default;
+  void getTextDimensions(const char* string, int* w, int* h, Style style = REGULAR) const;
+  bool hasPrintableChars(const char* string, Style style = REGULAR) const;
+  const EpdFontData* getData(Style style = REGULAR) const;
+  const EpdGlyph* getGlyph(uint32_t cp, Style style = REGULAR) const;
+
+ private:
   const EpdFont* regular;
   const EpdFont* bold;
   const EpdFont* italic;
   const EpdFont* boldItalic;
 
-  const EpdFont* getFont(EpdFontStyle style) const;
+  const EpdFont* getFont(Style style) const;
-
- public:
-  explicit EpdFontFamily(const EpdFont* regular, const EpdFont* bold = nullptr, const EpdFont* italic = nullptr,
-                         const EpdFont* boldItalic = nullptr)
-      : regular(regular), bold(bold), italic(italic), boldItalic(boldItalic) {}
-  ~EpdFontFamily() = default;
-  void getTextDimensions(const char* string, int* w, int* h, EpdFontStyle style = REGULAR) const;
-  bool hasPrintableChars(const char* string, EpdFontStyle style = REGULAR) const;
-
-  const EpdFontData* getData(EpdFontStyle style = REGULAR) const;
-  const EpdGlyph* getGlyph(uint32_t cp, EpdFontStyle style = REGULAR) const;
 };

lib/EpdFont/builtinFonts/all.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include <builtinFonts/bookerly_12_bold.h>
+#include <builtinFonts/bookerly_12_bolditalic.h>
+#include <builtinFonts/bookerly_12_italic.h>
+#include <builtinFonts/bookerly_12_regular.h>
+#include <builtinFonts/bookerly_14_bold.h>
+#include <builtinFonts/bookerly_14_bolditalic.h>
+#include <builtinFonts/bookerly_14_italic.h>
+#include <builtinFonts/bookerly_14_regular.h>
+#include <builtinFonts/bookerly_16_bold.h>
+#include <builtinFonts/bookerly_16_bolditalic.h>
+#include <builtinFonts/bookerly_16_italic.h>
+#include <builtinFonts/bookerly_16_regular.h>
+#include <builtinFonts/bookerly_18_bold.h>
+#include <builtinFonts/bookerly_18_bolditalic.h>
+#include <builtinFonts/bookerly_18_italic.h>
+#include <builtinFonts/bookerly_18_regular.h>
+#include <builtinFonts/notosans_8_regular.h>
+#include <builtinFonts/notosans_12_bold.h>
+#include <builtinFonts/notosans_12_bolditalic.h>
+#include <builtinFonts/notosans_12_italic.h>
+#include <builtinFonts/notosans_12_regular.h>
+#include <builtinFonts/notosans_14_bold.h>
+#include <builtinFonts/notosans_14_bolditalic.h>
+#include <builtinFonts/notosans_14_italic.h>
+#include <builtinFonts/notosans_14_regular.h>
+#include <builtinFonts/notosans_16_bold.h>
+#include <builtinFonts/notosans_16_bolditalic.h>
+#include <builtinFonts/notosans_16_italic.h>
+#include <builtinFonts/notosans_16_regular.h>
+#include <builtinFonts/notosans_18_bold.h>
+#include <builtinFonts/notosans_18_bolditalic.h>
+#include <builtinFonts/notosans_18_italic.h>
+#include <builtinFonts/notosans_18_regular.h>
+#include <builtinFonts/opendyslexic_10_bold.h>
+#include <builtinFonts/opendyslexic_10_bolditalic.h>
+#include <builtinFonts/opendyslexic_10_italic.h>
+#include <builtinFonts/opendyslexic_10_regular.h>
+#include <builtinFonts/opendyslexic_12_bold.h>
+#include <builtinFonts/opendyslexic_12_bolditalic.h>
+#include <builtinFonts/opendyslexic_12_italic.h>
+#include <builtinFonts/opendyslexic_12_regular.h>
+#include <builtinFonts/opendyslexic_14_bold.h>
+#include <builtinFonts/opendyslexic_14_bolditalic.h>
+#include <builtinFonts/opendyslexic_14_italic.h>
+#include <builtinFonts/opendyslexic_14_regular.h>
+#include <builtinFonts/opendyslexic_8_bold.h>
+#include <builtinFonts/opendyslexic_8_bolditalic.h>
+#include <builtinFonts/opendyslexic_8_italic.h>
+#include <builtinFonts/opendyslexic_8_regular.h>
+#include <builtinFonts/ubuntu_10_bold.h>
+#include <builtinFonts/ubuntu_10_regular.h>
+#include <builtinFonts/ubuntu_12_bold.h>
+#include <builtinFonts/ubuntu_12_regular.h>

lib/EpdFont/builtinFonts/source/NotoSans/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2022 The Noto Project Authors (https://github.com/notofonts/latin-greek-cyrillic)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

lib/EpdFont/builtinFonts/source/OpenDyslexic/OFL.txt

@@ -0,0 +1,94 @@
+Copyright (c) 2019-07-29, Abbie Gonzalez (https://abbiecod.es|support@abbiecod.es),
+with Reserved Font Name OpenDyslexic.
+Copyright (c) 12/2012 - 2019
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

lib/EpdFont/builtinFonts/source/Ubuntu/UFL.txt

@@ -0,0 +1,96 @@
+-------------------------------
+UBUNTU FONT LICENCE Version 1.0
+-------------------------------
+
+PREAMBLE
+This licence allows the licensed fonts to be used, studied, modified and
+redistributed freely. The fonts, including any derivative works, can be
+bundled, embedded, and redistributed provided the terms of this licence
+are met. The fonts and derivatives, however, cannot be released under
+any other licence. The requirement for fonts to remain under this
+licence does not require any document created using the fonts or their
+derivatives to be published under this licence, as long as the primary
+purpose of the document is not to be a vehicle for the distribution of
+the fonts.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this licence and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Original Version" refers to the collection of Font Software components
+as received under this licence.
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to
+a new environment.
+
+"Copyright Holder(s)" refers to all individuals and companies who have a
+copyright ownership of the Font Software.
+
+"Substantially Changed" refers to Modified Versions which can be easily
+identified as dissimilar to the Font Software by users of the Font
+Software comparing the Original Version with the Modified Version.
+
+To "Propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy. Propagation includes copying,
+distribution (with or without modification and with or without charging
+a redistribution fee), making available to the public, and in some
+countries other activities as well.
+
+PERMISSION & CONDITIONS
+This licence does not grant any rights under trademark law and all such
+rights are reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of the Font Software, to propagate the Font Software, subject to
+the below conditions:
+
+1) Each copy of the Font Software must contain the above copyright
+notice and this licence. These can be included either as stand-alone
+text files, human-readable headers or in the appropriate machine-
+readable metadata fields within text or binary files as long as those
+fields can be easily viewed by the user.
+
+2) The font name complies with the following:
+(a) The Original Version must retain its name, unmodified.
+(b) Modified Versions which are Substantially Changed must be renamed to
+avoid use of the name of the Original Version or similar names entirely.
+(c) Modified Versions which are not Substantially Changed must be
+renamed to both (i) retain the name of the Original Version and (ii) add
+additional naming elements to distinguish the Modified Version from the
+Original Version. The name of such Modified Versions must be the name of
+the Original Version, with "derivative X" where X represents the name of
+the new work, appended to that name.
+
+3) The name(s) of the Copyright Holder(s) and any contributor to the
+Font Software shall not be used to promote, endorse or advertise any
+Modified Version, except (i) as required by this licence, (ii) to
+acknowledge the contribution(s) of the Copyright Holder(s) or (iii) with
+their explicit written permission.
+
+4) The Font Software, modified or unmodified, in part or in whole, must
+be distributed entirely under this licence, and must not be distributed
+under any other licence. The requirement for fonts to remain under this
+licence does not affect any document created using the Font Software,
+except any version of the Font Software extracted from a document
+created using the Font Software may only be distributed under this
+licence.
+
+TERMINATION
+This licence becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
+COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER
+DEALINGS IN THE FONT SOFTWARE.

lib/EpdFont/scripts/build-font-ids.sh

@@ -0,0 +1,137 @@
+#!/bin/bash
+
+set -e
+
+cd "$(dirname "$0")/../builtinFonts"
+
+echo "// The contents of this file are generated by ./lib/EpdFont/scripts/build-font-ids.sh"
+echo "#pragma once"
+echo ""
+
+echo "#define BOOKERLY_12_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./bookerly_12_regular.h",
+  "./bookerly_12_bold.h",
+  "./bookerly_12_bolditalic.h",
+  "./bookerly_12_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define BOOKERLY_14_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./bookerly_14_regular.h",
+  "./bookerly_14_bold.h",
+  "./bookerly_14_bolditalic.h",
+  "./bookerly_14_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define BOOKERLY_16_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./bookerly_16_regular.h",
+  "./bookerly_16_bold.h",
+  "./bookerly_16_bolditalic.h",
+  "./bookerly_16_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define BOOKERLY_18_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./bookerly_18_regular.h",
+  "./bookerly_18_bold.h",
+  "./bookerly_18_bolditalic.h",
+  "./bookerly_18_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define NOTOSANS_12_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./notosans_12_regular.h",
+  "./notosans_12_bold.h",
+  "./notosans_12_bolditalic.h",
+  "./notosans_12_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define NOTOSANS_14_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./notosans_14_regular.h",
+  "./notosans_14_bold.h",
+  "./notosans_14_bolditalic.h",
+  "./notosans_14_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define NOTOSANS_16_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./notosans_16_regular.h",
+  "./notosans_16_bold.h",
+  "./notosans_16_bolditalic.h",
+  "./notosans_16_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define NOTOSANS_18_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./notosans_18_regular.h",
+  "./notosans_18_bold.h",
+  "./notosans_18_bolditalic.h",
+  "./notosans_18_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define OPENDYSLEXIC_8_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./opendyslexic_8_regular.h",
+  "./opendyslexic_8_bold.h",
+  "./opendyslexic_8_bolditalic.h",
+  "./opendyslexic_8_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define OPENDYSLEXIC_10_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./opendyslexic_10_regular.h",
+  "./opendyslexic_10_bold.h",
+  "./opendyslexic_10_bolditalic.h",
+  "./opendyslexic_10_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define OPENDYSLEXIC_12_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./opendyslexic_12_regular.h",
+  "./opendyslexic_12_bold.h",
+  "./opendyslexic_12_bolditalic.h",
+  "./opendyslexic_12_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define OPENDYSLEXIC_14_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./opendyslexic_14_regular.h",
+  "./opendyslexic_14_bold.h",
+  "./opendyslexic_14_bolditalic.h",
+  "./opendyslexic_14_italic.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define UI_10_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./ubuntu_10_regular.h",
+  "./ubuntu_10_bold.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define UI_12_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./ubuntu_12_regular.h",
+  "./ubuntu_12_bold.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"
+
+echo "#define SMALL_FONT_ID ($(
+ruby -rdigest -e 'puts [
+  "./notosans_8_regular.h",
+].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
+))"

lib/EpdFont/scripts/convert-builtin-fonts.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+set -e
+
+cd "$(dirname "$0")"
+
+READER_FONT_STYLES=("Regular" "Italic" "Bold" "BoldItalic")
+BOOKERLY_FONT_SIZES=(12 14 16 18)
+NOTOSANS_FONT_SIZES=(12 14 16 18)
+OPENDYSLEXIC_FONT_SIZES=(8 10 12 14)
+
+for size in ${BOOKERLY_FONT_SIZES[@]}; do
+  for style in ${READER_FONT_STYLES[@]}; do
+    font_name="bookerly_${size}_$(echo $style | tr '[:upper:]' '[:lower:]')"
+    font_path="../builtinFonts/source/Bookerly/Bookerly-${style}.ttf"
+    output_path="../builtinFonts/${font_name}.h"
+    python fontconvert.py $font_name $size $font_path --2bit > $output_path
+    echo "Generated $output_path"
+  done
+done
+
+for size in ${NOTOSANS_FONT_SIZES[@]}; do
+  for style in ${READER_FONT_STYLES[@]}; do
+    font_name="notosans_${size}_$(echo $style | tr '[:upper:]' '[:lower:]')"
+    font_path="../builtinFonts/source/NotoSans/NotoSans-${style}.ttf"
+    output_path="../builtinFonts/${font_name}.h"
+    python fontconvert.py $font_name $size $font_path --2bit > $output_path
+    echo "Generated $output_path"
+  done
+done
+
+for size in ${OPENDYSLEXIC_FONT_SIZES[@]}; do
+  for style in ${READER_FONT_STYLES[@]}; do
+    font_name="opendyslexic_${size}_$(echo $style | tr '[:upper:]' '[:lower:]')"
+    font_path="../builtinFonts/source/OpenDyslexic/OpenDyslexic-${style}.otf"
+    output_path="../builtinFonts/${font_name}.h"
+    python fontconvert.py $font_name $size $font_path --2bit > $output_path
+    echo "Generated $output_path"
+  done
+done
+
+UI_FONT_SIZES=(10 12)
+UI_FONT_STYLES=("Regular" "Bold")
+
+for size in ${UI_FONT_SIZES[@]}; do
+  for style in ${UI_FONT_STYLES[@]}; do
+    font_name="ubuntu_${size}_$(echo $style | tr '[:upper:]' '[:lower:]')"
+    font_path="../builtinFonts/source/Ubuntu/Ubuntu-${style}.ttf"
+    output_path="../builtinFonts/${font_name}.h"
+    python fontconvert.py $font_name $size $font_path > $output_path
+    echo "Generated $output_path"
+  done
+done
+
+python fontconvert.py notosans_8_regular 8 ../builtinFonts/source/NotoSans/NotoSans-Regular.ttf > ../builtinFonts/notosans_8_regular.h

lib/Epub/Epub.cpp

@@ -3,11 +3,12 @@
 #include <FsHelpers.h>
 #include <HardwareSerial.h>
 #include <JpegToBmpConverter.h>
-#include <SD.h>
+#include <SDCardManager.h>
 #include <ZipFile.h>
 
 #include "Epub/parsers/ContainerParser.h"
 #include "Epub/parsers/ContentOpfParser.h"
+#include "Epub/parsers/TocNavParser.h"
 #include "Epub/parsers/TocNcxParser.h"
 
 bool Epub::findContentOpfFile(std::string* contentOpfFile) const {
@@ -60,9 +61,6 @@ bool Epub::parseContentOpf(BookMetadataCache::BookMetadata& bookMetadata) {
   }
 
   ContentOpfParser opfParser(getCachePath(), getBasePath(), contentOpfSize, bookMetadataCache.get());
-  Serial.printf("[%lu] [MEM] Free: %d bytes, Total: %d bytes, Min Free: %d bytes\n", millis(), ESP.getFreeHeap(),
-                ESP.getHeapSize(), ESP.getMinFreeHeap());
-
   if (!opfParser.setup()) {
     Serial.printf("[%lu] [EBP] Could not setup content.opf parser\n", millis());
     return false;
@@ -75,14 +73,18 @@ bool Epub::parseContentOpf(BookMetadataCache::BookMetadata& bookMetadata) {
 
   // Grab data from opfParser into epub
   bookMetadata.title = opfParser.title;
-  // TODO: Parse author
+  bookMetadata.author = opfParser.author;
-  bookMetadata.author = "";
   bookMetadata.coverItemHref = opfParser.coverItemHref;
+  bookMetadata.textReferenceHref = opfParser.textReferenceHref;
 
   if (!opfParser.tocNcxPath.empty()) {
     tocNcxItem = opfParser.tocNcxPath;
   }
 
+  if (!opfParser.tocNavPath.empty()) {
+    tocNavItem = opfParser.tocNavPath;
+  }
+
   Serial.printf("[%lu] [EBP] Successfully parsed content.opf\n", millis());
   return true;
 }
@@ -97,13 +99,13 @@ bool Epub::parseTocNcxFile() const {
   Serial.printf("[%lu] [EBP] Parsing toc ncx file: %s\n", millis(), tocNcxItem.c_str());
 
   const auto tmpNcxPath = getCachePath() + "/toc.ncx";
-  File tempNcxFile;
+  FsFile tempNcxFile;
-  if (!FsHelpers::openFileForWrite("EBP", tmpNcxPath, tempNcxFile)) {
+  if (!SdMan.openFileForWrite("EBP", tmpNcxPath, tempNcxFile)) {
     return false;
   }
   readItemContentsToStream(tocNcxItem, tempNcxFile, 1024);
   tempNcxFile.close();
-  if (!FsHelpers::openFileForRead("EBP", tmpNcxPath, tempNcxFile)) {
+  if (!SdMan.openFileForRead("EBP", tmpNcxPath, tempNcxFile)) {
     return false;
   }
   const auto ncxSize = tempNcxFile.size();
@@ -112,17 +114,20 @@ bool Epub::parseTocNcxFile() const {
 
   if (!ncxParser.setup()) {
     Serial.printf("[%lu] [EBP] Could not setup toc ncx parser\n", millis());
+    tempNcxFile.close();
     return false;
   }
 
   const auto ncxBuffer = static_cast<uint8_t*>(malloc(1024));
   if (!ncxBuffer) {
     Serial.printf("[%lu] [EBP] Could not allocate memory for toc ncx parser\n", millis());
+    tempNcxFile.close();
     return false;
   }
 
   while (tempNcxFile.available()) {
     const auto readSize = tempNcxFile.read(ncxBuffer, 1024);
+    if (readSize == 0) break;
     const auto processedSize = ncxParser.write(ncxBuffer, readSize);
 
     if (processedSize != readSize) {
@@ -135,14 +140,68 @@ bool Epub::parseTocNcxFile() const {
 
   free(ncxBuffer);
   tempNcxFile.close();
-  SD.remove(tmpNcxPath.c_str());
+  SdMan.remove(tmpNcxPath.c_str());
 
   Serial.printf("[%lu] [EBP] Parsed TOC items\n", millis());
   return true;
 }
 
+bool Epub::parseTocNavFile() const {
+  // the nav file should have been specified in the content.opf file (EPUB 3)
+  if (tocNavItem.empty()) {
+    Serial.printf("[%lu] [EBP] No nav file specified\n", millis());
+    return false;
+  }
+
+  Serial.printf("[%lu] [EBP] Parsing toc nav file: %s\n", millis(), tocNavItem.c_str());
+
+  const auto tmpNavPath = getCachePath() + "/toc.nav";
+  FsFile tempNavFile;
+  if (!SdMan.openFileForWrite("EBP", tmpNavPath, tempNavFile)) {
+    return false;
+  }
+  readItemContentsToStream(tocNavItem, tempNavFile, 1024);
+  tempNavFile.close();
+  if (!SdMan.openFileForRead("EBP", tmpNavPath, tempNavFile)) {
+    return false;
+  }
+  const auto navSize = tempNavFile.size();
+
+  TocNavParser navParser(contentBasePath, navSize, bookMetadataCache.get());
+
+  if (!navParser.setup()) {
+    Serial.printf("[%lu] [EBP] Could not setup toc nav parser\n", millis());
+    return false;
+  }
+
+  const auto navBuffer = static_cast<uint8_t*>(malloc(1024));
+  if (!navBuffer) {
+    Serial.printf("[%lu] [EBP] Could not allocate memory for toc nav parser\n", millis());
+    return false;
+  }
+
+  while (tempNavFile.available()) {
+    const auto readSize = tempNavFile.read(navBuffer, 1024);
+    const auto processedSize = navParser.write(navBuffer, readSize);
+
+    if (processedSize != readSize) {
+      Serial.printf("[%lu] [EBP] Could not process all toc nav data\n", millis());
+      free(navBuffer);
+      tempNavFile.close();
+      return false;
+    }
+  }
+
+  free(navBuffer);
+  tempNavFile.close();
+  SdMan.remove(tmpNavPath.c_str());
+
+  Serial.printf("[%lu] [EBP] Parsed TOC nav items\n", millis());
+  return true;
+}
+
 // load in the meta data for the epub file
-bool Epub::load() {
+bool Epub::load(const bool buildIfMissing) {
   Serial.printf("[%lu] [EBP] Loading ePub: %s\n", millis(), filepath.c_str());
 
   // Initialize spine/TOC cache
@@ -154,6 +213,11 @@ bool Epub::load() {
     return true;
   }
 
+  // If we didn't load from cache above and we aren't allowed to build, fail now
+  if (!buildIfMissing) {
+    return false;
+  }
+
   // Cache doesn't exist or is invalid, build it
   Serial.printf("[%lu] [EBP] Cache not found, building spine/TOC cache\n", millis());
   setupCacheDir();
@@ -179,15 +243,31 @@ bool Epub::load() {
     return false;
   }
 
-  // TOC Pass
+  // TOC Pass - try EPUB 3 nav first, fall back to NCX
   if (!bookMetadataCache->beginTocPass()) {
     Serial.printf("[%lu] [EBP] Could not begin writing toc pass\n", millis());
     return false;
   }
-  if (!parseTocNcxFile()) {
+
-    Serial.printf("[%lu] [EBP] Could not parse toc\n", millis());
+  bool tocParsed = false;
-    return false;
+
+  // Try EPUB 3 nav document first (preferred)
+  if (!tocNavItem.empty()) {
+    Serial.printf("[%lu] [EBP] Attempting to parse EPUB 3 nav document\n", millis());
+    tocParsed = parseTocNavFile();
   }
+
+  // Fall back to NCX if nav parsing failed or wasn't available
+  if (!tocParsed && !tocNcxItem.empty()) {
+    Serial.printf("[%lu] [EBP] Falling back to NCX TOC\n", millis());
+    tocParsed = parseTocNcxFile();
+  }
+
+  if (!tocParsed) {
+    Serial.printf("[%lu] [EBP] Warning: Could not parse any TOC format\n", millis());
+    // Continue anyway - book will work without TOC
+  }
+
   if (!bookMetadataCache->endTocPass()) {
     Serial.printf("[%lu] [EBP] Could not end writing toc pass\n", millis());
     return false;
@@ -221,12 +301,12 @@ bool Epub::load() {
 }
 
 bool Epub::clearCache() const {
-  if (!SD.exists(cachePath.c_str())) {
+  if (!SdMan.exists(cachePath.c_str())) {
     Serial.printf("[%lu] [EPB] Cache does not exist, no action needed\n", millis());
     return true;
   }
 
-  if (!FsHelpers::removeDir(cachePath.c_str())) {
+  if (!SdMan.removeDir(cachePath.c_str())) {
     Serial.printf("[%lu] [EPB] Failed to clear cache\n", millis());
     return false;
   }
@@ -236,17 +316,11 @@ bool Epub::clearCache() const {
 }
 
 void Epub::setupCacheDir() const {
-  if (SD.exists(cachePath.c_str())) {
+  if (SdMan.exists(cachePath.c_str())) {
     return;
   }
 
-  // Loop over each segment of the cache path and create directories as needed
+  SdMan.mkdir(cachePath.c_str());
-  for (size_t i = 1; i < cachePath.length(); i++) {
-    if (cachePath[i] == '/') {
-      SD.mkdir(cachePath.substr(0, i).c_str());
-    }
-  }
-  SD.mkdir(cachePath.c_str());
 }
 
 const std::string& Epub::getCachePath() const { return cachePath; }
@@ -262,11 +336,20 @@ const std::string& Epub::getTitle() const {
   return bookMetadataCache->coreMetadata.title;
 }
 
+const std::string& Epub::getAuthor() const {
+  static std::string blank;
+  if (!bookMetadataCache || !bookMetadataCache->isLoaded()) {
+    return blank;
+  }
+
+  return bookMetadataCache->coreMetadata.author;
+}
+
 std::string Epub::getCoverBmpPath() const { return cachePath + "/cover.bmp"; }
 
 bool Epub::generateCoverBmp() const {
   // Already generated, return true
-  if (SD.exists(getCoverBmpPath().c_str())) {
+  if (SdMan.exists(getCoverBmpPath().c_str())) {
     return true;
   }
 
@@ -286,30 +369,30 @@ bool Epub::generateCoverBmp() const {
     Serial.printf("[%lu] [EBP] Generating BMP from JPG cover image\n", millis());
     const auto coverJpgTempPath = getCachePath() + "/.cover.jpg";
 
-    File coverJpg;
+    FsFile coverJpg;
-    if (!FsHelpers::openFileForWrite("EBP", coverJpgTempPath, coverJpg)) {
+    if (!SdMan.openFileForWrite("EBP", coverJpgTempPath, coverJpg)) {
       return false;
     }
     readItemContentsToStream(coverImageHref, coverJpg, 1024);
     coverJpg.close();
 
-    if (!FsHelpers::openFileForRead("EBP", coverJpgTempPath, coverJpg)) {
+    if (!SdMan.openFileForRead("EBP", coverJpgTempPath, coverJpg)) {
       return false;
     }
 
-    File coverBmp;
+    FsFile coverBmp;
-    if (!FsHelpers::openFileForWrite("EBP", getCoverBmpPath(), coverBmp)) {
+    if (!SdMan.openFileForWrite("EBP", getCoverBmpPath(), coverBmp)) {
       coverJpg.close();
       return false;
     }
     const bool success = JpegToBmpConverter::jpegFileToBmpStream(coverJpg, coverBmp);
     coverJpg.close();
     coverBmp.close();
-    SD.remove(coverJpgTempPath.c_str());
+    SdMan.remove(coverJpgTempPath.c_str());
 
     if (!success) {
       Serial.printf("[%lu] [EBP] Failed to generate BMP from JPG cover image\n", millis());
-      SD.remove(getCoverBmpPath().c_str());
+      SdMan.remove(getCoverBmpPath().c_str());
     }
     Serial.printf("[%lu] [EBP] Generated BMP from JPG cover image, success: %s\n", millis(), success ? "yes" : "no");
     return success;
@@ -321,10 +404,14 @@ bool Epub::generateCoverBmp() const {
 }
 
 uint8_t* Epub::readItemContentsToBytes(const std::string& itemHref, size_t* size, const bool trailingNullByte) const {
-  const ZipFile zip("/sd" + filepath);
+  if (itemHref.empty()) {
+    Serial.printf("[%lu] [EBP] Failed to read item, empty href\n", millis());
+    return nullptr;
+  }
+
   const std::string path = FsHelpers::normalisePath(itemHref);
 
-  const auto content = zip.readFileToMemory(path.c_str(), size, trailingNullByte);
+  const auto content = ZipFile(filepath).readFileToMemory(path.c_str(), size, trailingNullByte);
   if (!content) {
     Serial.printf("[%lu] [EBP] Failed to read item %s\n", millis(), path.c_str());
     return nullptr;
@@ -334,20 +421,18 @@ uint8_t* Epub::readItemContentsToBytes(const std::string& itemHref, size_t* size
 }
 
 bool Epub::readItemContentsToStream(const std::string& itemHref, Print& out, const size_t chunkSize) const {
-  const ZipFile zip("/sd" + filepath);
+  if (itemHref.empty()) {
-  const std::string path = FsHelpers::normalisePath(itemHref);
+    Serial.printf("[%lu] [EBP] Failed to read item, empty href\n", millis());
+    return false;
+  }
 
-  return zip.readFileToStream(path.c_str(), out, chunkSize);
+  const std::string path = FsHelpers::normalisePath(itemHref);
+  return ZipFile(filepath).readFileToStream(path.c_str(), out, chunkSize);
 }
 
 bool Epub::getItemSize(const std::string& itemHref, size_t* size) const {
-  const ZipFile zip("/sd" + filepath);
-  return getItemSize(zip, itemHref, size);
-}
-
-bool Epub::getItemSize(const ZipFile& zip, const std::string& itemHref, size_t* size) {
   const std::string path = FsHelpers::normalisePath(itemHref);
-  return zip.getInflatedFileSize(path.c_str(), size);
+  return ZipFile(filepath).getInflatedFileSize(path.c_str(), size);
 }
 
 int Epub::getSpineItemsCount() const {
@@ -425,6 +510,35 @@ size_t Epub::getBookSize() const {
   return getCumulativeSpineItemSize(getSpineItemsCount() - 1);
 }
 
+int Epub::getSpineIndexForTextReference() const {
+  if (!bookMetadataCache || !bookMetadataCache->isLoaded()) {
+    Serial.printf("[%lu] [EBP] getSpineIndexForTextReference called but cache not loaded\n", millis());
+    return 0;
+  }
+  Serial.printf("[%lu] [ERS] Core Metadata: cover(%d)=%s, textReference(%d)=%s\n", millis(),
+                bookMetadataCache->coreMetadata.coverItemHref.size(),
+                bookMetadataCache->coreMetadata.coverItemHref.c_str(),
+                bookMetadataCache->coreMetadata.textReferenceHref.size(),
+                bookMetadataCache->coreMetadata.textReferenceHref.c_str());
+
+  if (bookMetadataCache->coreMetadata.textReferenceHref.empty()) {
+    // there was no textReference in epub, so we return 0 (the first chapter)
+    return 0;
+  }
+
+  // loop through spine items to get the correct index matching the text href
+  for (size_t i = 0; i < getSpineItemsCount(); i++) {
+    if (getSpineItem(i).href == bookMetadataCache->coreMetadata.textReferenceHref) {
+      Serial.printf("[%lu] [ERS] Text reference %s found at index %d\n", millis(),
+                    bookMetadataCache->coreMetadata.textReferenceHref.c_str(), i);
+      return i;
+    }
+  }
+  // This should not happen, as we checked for empty textReferenceHref earlier
+  Serial.printf("[%lu] [EBP] Section not found for text reference\n", millis());
+  return 0;
+}
+
 // Calculate progress in book
 uint8_t Epub::calculateProgress(const int currentSpineIndex, const float currentSpineRead) const {
   const size_t bookSize = getBookSize();

lib/Epub/Epub.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <Print.h>
+
 #include <memory>
 #include <string>
 #include <unordered_map>
@@ -10,8 +12,10 @@
 class ZipFile;
 
 class Epub {
-  // the ncx file
+  // the ncx file (EPUB 2)
   std::string tocNcxItem;
+  // the nav file (EPUB 3)
+  std::string tocNavItem;
   // where is the EPUBfile?
   std::string filepath;
   // the base path for items in the EPUB file
@@ -24,7 +28,7 @@ class Epub {
   bool findContentOpfFile(std::string* contentOpfFile) const;
   bool parseContentOpf(BookMetadataCache::BookMetadata& bookMetadata);
   bool parseTocNcxFile() const;
-  static bool getItemSize(const ZipFile& zip, const std::string& itemHref, size_t* size);
+  bool parseTocNavFile() const;
 
  public:
   explicit Epub(std::string filepath, const std::string& cacheDir) : filepath(std::move(filepath)) {
@@ -33,12 +37,13 @@ class Epub {
   }
   ~Epub() = default;
   std::string& getBasePath() { return contentBasePath; }
-  bool load();
+  bool load(bool buildIfMissing = true);
   bool clearCache() const;
   void setupCacheDir() const;
   const std::string& getCachePath() const;
   const std::string& getPath() const;
   const std::string& getTitle() const;
+  const std::string& getAuthor() const;
   std::string getCoverBmpPath() const;
   bool generateCoverBmp() const;
   uint8_t* readItemContentsToBytes(const std::string& itemHref, size_t* size = nullptr,
@@ -52,7 +57,8 @@ class Epub {
   int getSpineIndexForTocIndex(int tocIndex) const;
   int getTocIndexForSpineIndex(int spineIndex) const;
   size_t getCumulativeSpineItemSize(int spineIndex) const;
+  int getSpineIndexForTextReference() const;
 
   size_t getBookSize() const;
-  uint8_t calculateProgress(const int currentSpineIndex, const float currentSpineRead) const;
+  uint8_t calculateProgress(int currentSpineIndex, float currentSpineRead) const;
 };

lib/Epub/Epub/BookMetadataCache.cpp

@@ -1,7 +1,6 @@
 #include "BookMetadataCache.h"
 
 #include <HardwareSerial.h>
-#include <SD.h>
 #include <Serialization.h>
 #include <ZipFile.h>
 
@@ -10,7 +9,7 @@
 #include "FsHelpers.h"
 
 namespace {
-constexpr uint8_t BOOK_CACHE_VERSION = 1;
+constexpr uint8_t BOOK_CACHE_VERSION = 3;
 constexpr char bookBinFile[] = "/book.bin";
 constexpr char tmpSpineBinFile[] = "/spine.bin.tmp";
 constexpr char tmpTocBinFile[] = "/toc.bin.tmp";
@@ -30,7 +29,7 @@ bool BookMetadataCache::beginContentOpfPass() {
   Serial.printf("[%lu] [BMC] Beginning content opf pass\n", millis());
 
   // Open spine file for writing
-  return FsHelpers::openFileForWrite("BMC", cachePath + tmpSpineBinFile, spineFile);
+  return SdMan.openFileForWrite("BMC", cachePath + tmpSpineBinFile, spineFile);
 }
 
 bool BookMetadataCache::endContentOpfPass() {
@@ -42,10 +41,10 @@ bool BookMetadataCache::beginTocPass() {
   Serial.printf("[%lu] [BMC] Beginning toc pass\n", millis());
 
   // Open spine file for reading
-  if (!FsHelpers::openFileForRead("BMC", cachePath + tmpSpineBinFile, spineFile)) {
+  if (!SdMan.openFileForRead("BMC", cachePath + tmpSpineBinFile, spineFile)) {
     return false;
   }
-  if (!FsHelpers::openFileForWrite("BMC", cachePath + tmpTocBinFile, tocFile)) {
+  if (!SdMan.openFileForWrite("BMC", cachePath + tmpTocBinFile, tocFile)) {
     spineFile.close();
     return false;
   }
@@ -71,27 +70,27 @@ bool BookMetadataCache::endWrite() {
 
 bool BookMetadataCache::buildBookBin(const std::string& epubPath, const BookMetadata& metadata) {
   // Open all three files, writing to meta, reading from spine and toc
-  if (!FsHelpers::openFileForWrite("BMC", cachePath + bookBinFile, bookFile)) {
+  if (!SdMan.openFileForWrite("BMC", cachePath + bookBinFile, bookFile)) {
     return false;
   }
 
-  if (!FsHelpers::openFileForRead("BMC", cachePath + tmpSpineBinFile, spineFile)) {
+  if (!SdMan.openFileForRead("BMC", cachePath + tmpSpineBinFile, spineFile)) {
     bookFile.close();
     return false;
   }
 
-  if (!FsHelpers::openFileForRead("BMC", cachePath + tmpTocBinFile, tocFile)) {
+  if (!SdMan.openFileForRead("BMC", cachePath + tmpTocBinFile, tocFile)) {
     bookFile.close();
     spineFile.close();
     return false;
   }
 
-  constexpr size_t headerASize =
+  constexpr uint32_t headerASize =
-      sizeof(BOOK_CACHE_VERSION) + /* LUT Offset */ sizeof(size_t) + sizeof(spineCount) + sizeof(tocCount);
+      sizeof(BOOK_CACHE_VERSION) + /* LUT Offset */ sizeof(uint32_t) + sizeof(spineCount) + sizeof(tocCount);
-  const size_t metadataSize =
+  const uint32_t metadataSize = metadata.title.size() + metadata.author.size() + metadata.coverItemHref.size() +
-      metadata.title.size() + metadata.author.size() + metadata.coverItemHref.size() + sizeof(uint32_t) * 3;
+                                metadata.textReferenceHref.size() + sizeof(uint32_t) * 4;
-  const size_t lutSize = sizeof(size_t) * spineCount + sizeof(size_t) * tocCount;
+  const uint32_t lutSize = sizeof(uint32_t) * spineCount + sizeof(uint32_t) * tocCount;
-  const size_t lutOffset = headerASize + metadataSize;
+  const uint32_t lutOffset = headerASize + metadataSize;
 
   // Header A
   serialization::writePod(bookFile, BOOK_CACHE_VERSION);
@@ -102,11 +101,12 @@ bool BookMetadataCache::buildBookBin(const std::string& epubPath, const BookMeta
   serialization::writeString(bookFile, metadata.title);
   serialization::writeString(bookFile, metadata.author);
   serialization::writeString(bookFile, metadata.coverItemHref);
+  serialization::writeString(bookFile, metadata.textReferenceHref);
 
   // Loop through spine entries, writing LUT positions
   spineFile.seek(0);
   for (int i = 0; i < spineCount; i++) {
-    auto pos = spineFile.position();
+    uint32_t pos = spineFile.position();
     auto spineEntry = readSpineEntry(spineFile);
     serialization::writePod(bookFile, pos + lutOffset + lutSize);
   }
@@ -114,17 +114,37 @@ bool BookMetadataCache::buildBookBin(const std::string& epubPath, const BookMeta
   // Loop through toc entries, writing LUT positions
   tocFile.seek(0);
   for (int i = 0; i < tocCount; i++) {
-    auto pos = tocFile.position();
+    uint32_t pos = tocFile.position();
     auto tocEntry = readTocEntry(tocFile);
-    serialization::writePod(bookFile, pos + lutOffset + lutSize + spineFile.position());
+    serialization::writePod(bookFile, pos + lutOffset + lutSize + static_cast<uint32_t>(spineFile.position()));
   }
 
   // LUTs complete
   // Loop through spines from spine file matching up TOC indexes, calculating cumulative size and writing to book.bin
 
-  const ZipFile zip("/sd" + epubPath);
+  ZipFile zip(epubPath);
-  size_t cumSize = 0;
+  // Pre-open zip file to speed up size calculations
+  if (!zip.open()) {
+    Serial.printf("[%lu] [BMC] Could not open EPUB zip for size calculations\n", millis());
+    bookFile.close();
+    spineFile.close();
+    tocFile.close();
+    return false;
+  }
+  // TODO: For large ZIPs loading the all localHeaderOffsets will crash.
+  //       However not having them loaded is extremely slow. Need a better solution here.
+  //       Perhaps only a cache of spine items or a better way to speedup lookups?
+  if (!zip.loadAllFileStatSlims()) {
+    Serial.printf("[%lu] [BMC] Could not load zip local header offsets for size calculations\n", millis());
+    bookFile.close();
+    spineFile.close();
+    tocFile.close();
+    zip.close();
+    return false;
+  }
+  uint32_t cumSize = 0;
   spineFile.seek(0);
+  int lastSpineTocIndex = -1;
   for (int i = 0; i < spineCount; i++) {
     auto spineEntry = readSpineEntry(spineFile);
 
@@ -140,9 +160,12 @@ bool BookMetadataCache::buildBookBin(const std::string& epubPath, const BookMeta
     // Not a huge deal if we don't fine a TOC entry for the spine entry, this is expected behaviour for EPUBs
     // Logging here is for debugging
     if (spineEntry.tocIndex == -1) {
-      Serial.printf("[%lu] [BMC] Warning: Could not find TOC entry for spine item %d: %s\n", millis(), i,
+      Serial.printf(
-                    spineEntry.href.c_str());
+          "[%lu] [BMC] Warning: Could not find TOC entry for spine item %d: %s, using title from last section\n",
+          millis(), i, spineEntry.href.c_str());
+      spineEntry.tocIndex = lastSpineTocIndex;
     }
+    lastSpineTocIndex = spineEntry.tocIndex;
 
     // Calculate size for cumulative size
     size_t itemSize = 0;
@@ -157,6 +180,8 @@ bool BookMetadataCache::buildBookBin(const std::string& epubPath, const BookMeta
     // Write out spine data to book.bin
     writeSpineEntry(bookFile, spineEntry);
   }
+  // Close opened zip file
+  zip.close();
 
   // Loop through toc entries from toc file writing to book.bin
   tocFile.seek(0);
@@ -174,25 +199,25 @@ bool BookMetadataCache::buildBookBin(const std::string& epubPath, const BookMeta
 }
 
 bool BookMetadataCache::cleanupTmpFiles() const {
-  if (SD.exists((cachePath + tmpSpineBinFile).c_str())) {
+  if (SdMan.exists((cachePath + tmpSpineBinFile).c_str())) {
-    SD.remove((cachePath + tmpSpineBinFile).c_str());
+    SdMan.remove((cachePath + tmpSpineBinFile).c_str());
   }
-  if (SD.exists((cachePath + tmpTocBinFile).c_str())) {
+  if (SdMan.exists((cachePath + tmpTocBinFile).c_str())) {
-    SD.remove((cachePath + tmpTocBinFile).c_str());
+    SdMan.remove((cachePath + tmpTocBinFile).c_str());
   }
   return true;
 }
 
-size_t BookMetadataCache::writeSpineEntry(File& file, const SpineEntry& entry) const {
+uint32_t BookMetadataCache::writeSpineEntry(FsFile& file, const SpineEntry& entry) const {
-  const auto pos = file.position();
+  const uint32_t pos = file.position();
   serialization::writeString(file, entry.href);
   serialization::writePod(file, entry.cumulativeSize);
   serialization::writePod(file, entry.tocIndex);
   return pos;
 }
 
-size_t BookMetadataCache::writeTocEntry(File& file, const TocEntry& entry) const {
+uint32_t BookMetadataCache::writeTocEntry(FsFile& file, const TocEntry& entry) const {
-  const auto pos = file.position();
+  const uint32_t pos = file.position();
   serialization::writeString(file, entry.title);
   serialization::writeString(file, entry.href);
   serialization::writeString(file, entry.anchor);
@@ -223,6 +248,8 @@ void BookMetadataCache::createTocEntry(const std::string& title, const std::stri
 
   int spineIndex = -1;
   // find spine index
+  // TODO: This lookup is slow as need to scan through all items each time. We can't hold it all in memory due to size.
+  //       But perhaps we can load just the hrefs in a vector/list to do an index lookup?
   spineFile.seek(0);
   for (int i = 0; i < spineCount; i++) {
     auto spineEntry = readSpineEntry(spineFile);
@@ -244,7 +271,7 @@ void BookMetadataCache::createTocEntry(const std::string& title, const std::stri
 /* ============= READING / LOADING FUNCTIONS ================ */
 
 bool BookMetadataCache::load() {
-  if (!FsHelpers::openFileForRead("BMC", cachePath + bookBinFile, bookFile)) {
+  if (!SdMan.openFileForRead("BMC", cachePath + bookBinFile, bookFile)) {
     return false;
   }
 
@@ -263,6 +290,7 @@ bool BookMetadataCache::load() {
   serialization::readString(bookFile, coreMetadata.title);
   serialization::readString(bookFile, coreMetadata.author);
   serialization::readString(bookFile, coreMetadata.coverItemHref);
+  serialization::readString(bookFile, coreMetadata.textReferenceHref);
 
   loaded = true;
   Serial.printf("[%lu] [BMC] Loaded cache data: %d spine, %d TOC entries\n", millis(), spineCount, tocCount);
@@ -281,8 +309,8 @@ BookMetadataCache::SpineEntry BookMetadataCache::getSpineEntry(const int index)
   }
 
   // Seek to spine LUT item, read from LUT and get out data
-  bookFile.seek(lutOffset + sizeof(size_t) * index);
+  bookFile.seek(lutOffset + sizeof(uint32_t) * index);
-  size_t spineEntryPos;
+  uint32_t spineEntryPos;
   serialization::readPod(bookFile, spineEntryPos);
   bookFile.seek(spineEntryPos);
   return readSpineEntry(bookFile);
@@ -300,14 +328,14 @@ BookMetadataCache::TocEntry BookMetadataCache::getTocEntry(const int index) {
   }
 
   // Seek to TOC LUT item, read from LUT and get out data
-  bookFile.seek(lutOffset + sizeof(size_t) * spineCount + sizeof(size_t) * index);
+  bookFile.seek(lutOffset + sizeof(uint32_t) * spineCount + sizeof(uint32_t) * index);
-  size_t tocEntryPos;
+  uint32_t tocEntryPos;
   serialization::readPod(bookFile, tocEntryPos);
   bookFile.seek(tocEntryPos);
   return readTocEntry(bookFile);
 }
 
-BookMetadataCache::SpineEntry BookMetadataCache::readSpineEntry(File& file) const {
+BookMetadataCache::SpineEntry BookMetadataCache::readSpineEntry(FsFile& file) const {
   SpineEntry entry;
   serialization::readString(file, entry.href);
   serialization::readPod(file, entry.cumulativeSize);
@@ -315,7 +343,7 @@ BookMetadataCache::SpineEntry BookMetadataCache::readSpineEntry(File& file) cons
   return entry;
 }
 
-BookMetadataCache::TocEntry BookMetadataCache::readTocEntry(File& file) const {
+BookMetadataCache::TocEntry BookMetadataCache::readTocEntry(FsFile& file) const {
   TocEntry entry;
   serialization::readString(file, entry.title);
   serialization::readString(file, entry.href);

lib/Epub/Epub/BookMetadataCache.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <SD.h>
+#include <SDCardManager.h>
 
 #include <string>
 
@@ -10,6 +10,7 @@ class BookMetadataCache {
     std::string title;
     std::string author;
     std::string coverItemHref;
+    std::string textReferenceHref;
   };
 
   struct SpineEntry {
@@ -46,15 +47,15 @@ class BookMetadataCache {
   bool loaded;
   bool buildMode;
 
-  File bookFile;
+  FsFile bookFile;
   // Temp file handles during build
-  File spineFile;
+  FsFile spineFile;
-  File tocFile;
+  FsFile tocFile;
 
-  size_t writeSpineEntry(File& file, const SpineEntry& entry) const;
+  uint32_t writeSpineEntry(FsFile& file, const SpineEntry& entry) const;
-  size_t writeTocEntry(File& file, const TocEntry& entry) const;
+  uint32_t writeTocEntry(FsFile& file, const TocEntry& entry) const;
-  SpineEntry readSpineEntry(File& file) const;
+  SpineEntry readSpineEntry(FsFile& file) const;
-  TocEntry readTocEntry(File& file) const;
+  TocEntry readTocEntry(FsFile& file) const;
 
  public:
   BookMetadata coreMetadata;

lib/Epub/Epub/FsHelpers.cpp

@@ -1,92 +0,0 @@
-#include "FsHelpers.h"
-
-#include <SD.h>
-
-#include <vector>
-
-bool FsHelpers::openFileForRead(const char* moduleName, const std::string& path, File& file) {
-  file = SD.open(path.c_str(), FILE_READ);
-  if (!file) {
-    Serial.printf("[%lu] [%s] Failed to open file for reading: %s\n", millis(), moduleName, path.c_str());
-    return false;
-  }
-  return true;
-}
-
-bool FsHelpers::openFileForWrite(const char* moduleName, const std::string& path, File& file) {
-  file = SD.open(path.c_str(), FILE_WRITE, true);
-  if (!file) {
-    Serial.printf("[%lu] [%s] Failed to open file for writing: %s\n", millis(), moduleName, path.c_str());
-    return false;
-  }
-  return true;
-}
-
-bool FsHelpers::removeDir(const char* path) {
-  // 1. Open the directory
-  File dir = SD.open(path);
-  if (!dir) {
-    return false;
-  }
-  if (!dir.isDirectory()) {
-    return false;
-  }
-
-  File file = dir.openNextFile();
-  while (file) {
-    String filePath = path;
-    if (!filePath.endsWith("/")) {
-      filePath += "/";
-    }
-    filePath += file.name();
-
-    if (file.isDirectory()) {
-      if (!removeDir(filePath.c_str())) {
-        return false;
-      }
-    } else {
-      if (!SD.remove(filePath.c_str())) {
-        return false;
-      }
-    }
-    file = dir.openNextFile();
-  }
-
-  return SD.rmdir(path);
-}
-
-std::string FsHelpers::normalisePath(const std::string& path) {
-  std::vector<std::string> components;
-  std::string component;
-
-  for (const auto c : path) {
-    if (c == '/') {
-      if (!component.empty()) {
-        if (component == "..") {
-          if (!components.empty()) {
-            components.pop_back();
-          }
-        } else {
-          components.push_back(component);
-        }
-        component.clear();
-      }
-    } else {
-      component += c;
-    }
-  }
-
-  if (!component.empty()) {
-    components.push_back(component);
-  }
-
-  std::string result;
-  for (const auto& c : components) {
-    if (!result.empty()) {
-      result += "/";
-    }
-    result += c;
-  }
-
-  return result;
-}

lib/Epub/Epub/FsHelpers.h

@@ -1,12 +0,0 @@
-#pragma once
-#include <FS.h>
-
-#include <string>
-
-class FsHelpers {
- public:
-  static bool openFileForRead(const char* moduleName, const std::string& path, File& file);
-  static bool openFileForWrite(const char* moduleName, const std::string& path, File& file);
-  static bool removeDir(const char* path);
-  static std::string normalisePath(const std::string& path);
-};

lib/Epub/Epub/Page.cpp

@@ -3,21 +3,19 @@
 #include <HardwareSerial.h>
 #include <Serialization.h>
 
-namespace {
+void PageLine::render(GfxRenderer& renderer, const int fontId, const int xOffset, const int yOffset) {
-constexpr uint8_t PAGE_FILE_VERSION = 3;
+  block->render(renderer, fontId, xPos + xOffset, yPos + yOffset);
 }
 
-void PageLine::render(GfxRenderer& renderer, const int fontId) { block->render(renderer, fontId, xPos, yPos); }
+bool PageLine::serialize(FsFile& file) {
-
-void PageLine::serialize(File& file) {
   serialization::writePod(file, xPos);
   serialization::writePod(file, yPos);
 
   // serialize TextBlock pointed to by PageLine
-  block->serialize(file);
+  return block->serialize(file);
 }
 
-std::unique_ptr<PageLine> PageLine::deserialize(File& file) {
+std::unique_ptr<PageLine> PageLine::deserialize(FsFile& file) {
   int16_t xPos;
   int16_t yPos;
   serialization::readPod(file, xPos);
@@ -27,39 +25,34 @@ std::unique_ptr<PageLine> PageLine::deserialize(File& file) {
   return std::unique_ptr<PageLine>(new PageLine(std::move(tb), xPos, yPos));
 }
 
-void Page::render(GfxRenderer& renderer, const int fontId) const {
+void Page::render(GfxRenderer& renderer, const int fontId, const int xOffset, const int yOffset) const {
   for (auto& element : elements) {
-    element->render(renderer, fontId);
+    element->render(renderer, fontId, xOffset, yOffset);
   }
 }
 
-void Page::serialize(File& file) const {
+bool Page::serialize(FsFile& file) const {
-  serialization::writePod(file, PAGE_FILE_VERSION);
+  const uint16_t count = elements.size();
-
-  const uint32_t count = elements.size();
   serialization::writePod(file, count);
 
   for (const auto& el : elements) {
     // Only PageLine exists currently
     serialization::writePod(file, static_cast<uint8_t>(TAG_PageLine));
-    el->serialize(file);
+    if (!el->serialize(file)) {
+      return false;
+    }
   }
+
+  return true;
 }
 
-std::unique_ptr<Page> Page::deserialize(File& file) {
+std::unique_ptr<Page> Page::deserialize(FsFile& file) {
-  uint8_t version;
-  serialization::readPod(file, version);
-  if (version != PAGE_FILE_VERSION) {
-    Serial.printf("[%lu] [PGE] Deserialization failed: Unknown version %u\n", millis(), version);
-    return nullptr;
-  }
-
   auto page = std::unique_ptr<Page>(new Page());
 
-  uint32_t count;
+  uint16_t count;
   serialization::readPod(file, count);
 
-  for (uint32_t i = 0; i < count; i++) {
+  for (uint16_t i = 0; i < count; i++) {
     uint8_t tag;
     serialization::readPod(file, tag);
 

lib/Epub/Epub/Page.h

@@ -1,5 +1,5 @@
 #pragma once
-#include <FS.h>
+#include <SdFat.h>
 
 #include <utility>
 #include <vector>
@@ -17,8 +17,8 @@ class PageElement {
   int16_t yPos;
   explicit PageElement(const int16_t xPos, const int16_t yPos) : xPos(xPos), yPos(yPos) {}
   virtual ~PageElement() = default;
-  virtual void render(GfxRenderer& renderer, int fontId) = 0;
+  virtual void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) = 0;
-  virtual void serialize(File& file) = 0;
+  virtual bool serialize(FsFile& file) = 0;
 };
 
 // a line from a block element
@@ -28,16 +28,16 @@ class PageLine final : public PageElement {
  public:
   PageLine(std::shared_ptr<TextBlock> block, const int16_t xPos, const int16_t yPos)
       : PageElement(xPos, yPos), block(std::move(block)) {}
-  void render(GfxRenderer& renderer, int fontId) override;
+  void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) override;
-  void serialize(File& file) override;
+  bool serialize(FsFile& file) override;
-  static std::unique_ptr<PageLine> deserialize(File& file);
+  static std::unique_ptr<PageLine> deserialize(FsFile& file);
 };
 
 class Page {
  public:
   // the list of block index and line numbers on this page
   std::vector<std::shared_ptr<PageElement>> elements;
-  void render(GfxRenderer& renderer, int fontId) const;
+  void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) const;
-  void serialize(File& file) const;
+  bool serialize(FsFile& file) const;
-  static std::unique_ptr<Page> deserialize(File& file);
+  static std::unique_ptr<Page> deserialize(FsFile& file);
 };

lib/Epub/Epub/ParsedText.cpp

@@ -99,7 +99,91 @@ bool chooseSplitForWidth(const GfxRenderer& renderer, const int fontId, const st
 
 }  // namespace
 
-void ParsedText::addWord(std::string word, const EpdFontStyle fontStyle) {
+namespace {
+
+struct HyphenSplitDecision {
+  size_t byteOffset;
+  uint16_t prefixWidth;
+  bool appendHyphen;  // true when we must draw an extra hyphen after the prefix glyphs
+};
+
+// Verifies whether the substring ending at `offset` already contains a literal hyphen glyph, so we can avoid
+// drawing a duplicate hyphen when breaking the word.
+bool endsWithExplicitHyphen(const std::string& word, const size_t offset) {
+  if (offset == 0 || offset > word.size()) {
+    return false;
+  }
+
+  const unsigned char* base = reinterpret_cast<const unsigned char*>(word.data());
+  const unsigned char* ptr = base;
+  const unsigned char* target = base + offset;
+  const unsigned char* lastStart = nullptr;
+
+  while (ptr < target) {
+    lastStart = ptr;
+    utf8NextCodepoint(&ptr);
+    if (ptr > target) {
+      return false;
+    }
+  }
+
+  if (!lastStart || ptr != target) {
+    return false;
+  }
+
+  const unsigned char* tmp = lastStart;
+  const uint32_t cp = utf8NextCodepoint(&tmp);  // decode the codepoint immediately prior to the break
+  return isExplicitHyphen(cp);
+}
+
+bool chooseSplitForWidth(const GfxRenderer& renderer, const int fontId, const std::string& word,
+                         const EpdFontFamily::Style style, const int availableWidth, const bool includeFallback,
+                         HyphenSplitDecision* decision) {
+  if (!decision || availableWidth <= 0) {
+    return false;
+  }
+
+  const int hyphenWidth = renderer.getTextWidth(fontId, "-", style);
+
+  auto offsets = Hyphenator::breakOffsets(word, includeFallback);
+  if (offsets.empty()) {
+    return false;
+  }
+
+  size_t chosenOffset = std::numeric_limits<size_t>::max();
+  uint16_t chosenWidth = 0;
+  bool chosenAppendHyphen = true;
+
+  for (const size_t offset : offsets) {
+    const bool needsInsertedHyphen = !endsWithExplicitHyphen(word, offset);
+    const int budget = availableWidth - (needsInsertedHyphen ? hyphenWidth : 0);
+    if (budget <= 0) {
+      continue;
+    }
+    const std::string prefix = word.substr(0, offset);
+    const int prefixWidth = renderer.getTextWidth(fontId, prefix.c_str(), style);
+    if (prefixWidth <= budget) {
+      chosenOffset = offset;
+      chosenWidth = static_cast<uint16_t>(prefixWidth + (needsInsertedHyphen ? hyphenWidth : 0));
+      chosenAppendHyphen = needsInsertedHyphen;
+    } else {
+      break;
+    }
+  }
+
+  if (chosenOffset == std::numeric_limits<size_t>::max()) {
+    return false;
+  }
+
+  decision->byteOffset = chosenOffset;
+  decision->prefixWidth = chosenWidth;
+  decision->appendHyphen = chosenAppendHyphen;
+  return true;
+}
+
+}  // namespace
+
+void ParsedText::addWord(std::string word, const EpdFontFamily::Style fontStyle) {
   if (word.empty()) return;
 
   words.push_back(std::move(word));
@@ -107,14 +191,14 @@ void ParsedText::addWord(std::string word, const EpdFontStyle fontStyle) {
 }
 
 // Consumes data to minimize memory usage
-void ParsedText::layoutAndExtractLines(const GfxRenderer& renderer, const int fontId, const int horizontalMargin,
+void ParsedText::layoutAndExtractLines(const GfxRenderer& renderer, const int fontId, const uint16_t viewportWidth,
                                        const std::function<void(std::shared_ptr<TextBlock>)>& processLine,
                                        const bool includeLastLine) {
   if (words.empty()) {
     return;
   }
 
-  const int pageWidth = renderer.getScreenWidth() - horizontalMargin;
+  const int pageWidth = viewportWidth;
   const int spaceWidth = renderer.getSpaceWidth(fontId);
   // Pre-split oversized tokens so the DP step always has feasible line candidates.
   auto wordWidths = calculateWordWidths(renderer, fontId, pageWidth);
@@ -364,7 +448,7 @@ void ParsedText::extractLine(const size_t breakIndex, const int pageWidth, const
 
   std::list<std::string> lineWords;
   lineWords.splice(lineWords.begin(), words, words.begin(), wordEndIt);
-  std::list<EpdFontStyle> lineWordStyles;
+  std::list<EpdFontFamily::Style> lineWordStyles;
   lineWordStyles.splice(lineWordStyles.begin(), wordStyles, wordStyles.begin(), wordStyleEndIt);
 
   processLine(std::make_shared<TextBlock>(std::move(lineWords), std::move(lineXPos), std::move(lineWordStyles), style));

lib/Epub/Epub/ParsedText.h

@@ -14,8 +14,8 @@ class GfxRenderer;
 
 class ParsedText {
   std::list<std::string> words;
-  std::list<EpdFontStyle> wordStyles;
+  std::list<EpdFontFamily::Style> wordStyles;
-  TextBlock::BLOCK_STYLE style;
+  TextBlock::Style style;
   bool extraParagraphSpacing;
   bool hyphenationEnabled;
 
@@ -27,17 +27,17 @@ class ParsedText {
   std::vector<uint16_t> calculateWordWidths(const GfxRenderer& renderer, int fontId, int pageWidth);
 
  public:
-  explicit ParsedText(const TextBlock::BLOCK_STYLE style, const bool extraParagraphSpacing,
+  explicit ParsedText(const TextBlock::Style style, const bool extraParagraphSpacing,
                       const bool hyphenationEnabled)
       : style(style), extraParagraphSpacing(extraParagraphSpacing), hyphenationEnabled(hyphenationEnabled) {}
   ~ParsedText() = default;
 
-  void addWord(std::string word, EpdFontStyle fontStyle);
+  void addWord(std::string word, EpdFontFamily::Style fontStyle);
-  void setStyle(const TextBlock::BLOCK_STYLE style) { this->style = style; }
+  void setStyle(const TextBlock::Style style) { this->style = style; }
-  TextBlock::BLOCK_STYLE getStyle() const { return style; }
+  TextBlock::Style getStyle() const { return style; }
   size_t size() const { return words.size(); }
   bool isEmpty() const { return words.empty(); }
-  void layoutAndExtractLines(const GfxRenderer& renderer, int fontId, int horizontalMargin,
+  void layoutAndExtractLines(const GfxRenderer& renderer, int fontId, uint16_t viewportWidth,
                              const std::function<void(std::shared_ptr<TextBlock>)>& processLine,
                              bool includeLastLine = true);
 };

lib/Epub/Epub/Section.cpp

@@ -1,113 +1,113 @@
 #include "Section.h"
 
-#include <FsHelpers.h>
+#include <SDCardManager.h>
-#include <SD.h>
 #include <Serialization.h>
 
 #include "Page.h"
 #include "parsers/ChapterHtmlSlimParser.h"
 
 namespace {
-constexpr uint8_t SECTION_FILE_VERSION = 6;
+constexpr uint8_t SECTION_FILE_VERSION = 9;
-}
+constexpr uint32_t HEADER_SIZE = sizeof(uint8_t) + sizeof(int) + sizeof(float) + sizeof(bool) + sizeof(uint8_t) +
+                                 sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t);
+}  // namespace
 
-void Section::onPageComplete(std::unique_ptr<Page> page) {
+uint32_t Section::onPageComplete(std::unique_ptr<Page> page) {
-  const auto filePath = cachePath + "/page_" + std::to_string(pageCount) + ".bin";
+  if (!file) {
-
+    Serial.printf("[%lu] [SCT] File not open for writing page %d\n", millis(), pageCount);
-  File outputFile;
+    return 0;
-  if (!FsHelpers::openFileForWrite("SCT", filePath, outputFile)) {
-    return;
   }
-  page->serialize(outputFile);
-  outputFile.close();
 
+  const uint32_t position = file.position();
+  if (!page->serialize(file)) {
+    Serial.printf("[%lu] [SCT] Failed to serialize page %d\n", millis(), pageCount);
+    return 0;
+  }
   Serial.printf("[%lu] [SCT] Page %d processed\n", millis(), pageCount);
 
   pageCount++;
+  return position;
 }
 
-void Section::writeCacheMetadata(const int fontId, const float lineCompression, const int marginTop,
+void Section::writeSectionFileHeader(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                 const int marginRight, const int marginBottom, const int marginLeft,
+                                     const uint8_t paragraphAlignment, const uint16_t viewportWidth,
-                                 const bool extraParagraphSpacing, const bool hyphenationEnabled) const {
+                                     const uint16_t viewportHeight, const bool hyphenationEnabled) {
-  File outputFile;
+  if (!file) {
-  if (!FsHelpers::openFileForWrite("SCT", cachePath + "/section.bin", outputFile)) {
+    Serial.printf("[%lu] [SCT] File not open for writing header\n", millis());
     return;
   }
-  serialization::writePod(outputFile, SECTION_FILE_VERSION);
+  static_assert(HEADER_SIZE == sizeof(SECTION_FILE_VERSION) + sizeof(fontId) + sizeof(lineCompression) +
-  serialization::writePod(outputFile, fontId);
+                                   sizeof(extraParagraphSpacing) + sizeof(paragraphAlignment) + sizeof(viewportWidth) +
-  serialization::writePod(outputFile, lineCompression);
+                                   sizeof(viewportHeight) + sizeof(pageCount) + sizeof(uint32_t),
-  serialization::writePod(outputFile, marginTop);
+                "Header size mismatch");
-  serialization::writePod(outputFile, marginRight);
+  serialization::writePod(file, SECTION_FILE_VERSION);
-  serialization::writePod(outputFile, marginBottom);
+  serialization::writePod(file, fontId);
-  serialization::writePod(outputFile, marginLeft);
+  serialization::writePod(file, lineCompression);
-  serialization::writePod(outputFile, extraParagraphSpacing);
+  serialization::writePod(file, extraParagraphSpacing);
-  serialization::writePod(outputFile, hyphenationEnabled);
+  serialization::writePod(file, paragraphAlignment);
-  serialization::writePod(outputFile, pageCount);
+  serialization::writePod(file, viewportWidth);
-  outputFile.close();
+  serialization::writePod(file, viewportHeight);
+  serialization::writePod(file, pageCount);  // Placeholder for page count (will be initially 0 when written)
+  serialization::writePod(file, hyphenationEnabled);
+  serialization::writePod(file, static_cast<uint32_t>(0));  // Placeholder for LUT offset
 }
 
-bool Section::loadCacheMetadata(const int fontId, const float lineCompression, const int marginTop,
+bool Section::loadSectionFile(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                const int marginRight, const int marginBottom, const int marginLeft,
+                              const uint8_t paragraphAlignment, const uint16_t viewportWidth,
-                                const bool extraParagraphSpacing, const bool hyphenationEnabled) {
+                              const uint16_t viewportHeight, const bool hyphenationEnabled) {
-  const auto sectionFilePath = cachePath + "/section.bin";
+  if (!SdMan.openFileForRead("SCT", filePath, file)) {
-  File inputFile;
-  if (!FsHelpers::openFileForRead("SCT", sectionFilePath, inputFile)) {
     return false;
   }
 
   // Match parameters
   {
     uint8_t version;
-    serialization::readPod(inputFile, version);
+    serialization::readPod(file, version);
     if (version != SECTION_FILE_VERSION) {
-      inputFile.close();
+      file.close();
       Serial.printf("[%lu] [SCT] Deserialization failed: Unknown version %u\n", millis(), version);
       clearCache();
       return false;
     }
 
-    int fileFontId, fileMarginTop, fileMarginRight, fileMarginBottom, fileMarginLeft;
+    int fileFontId;
+    uint16_t fileViewportWidth, fileViewportHeight;
     float fileLineCompression;
     bool fileExtraParagraphSpacing;
+    uint8_t fileParagraphAlignment;
     bool fileHyphenationEnabled;
-    serialization::readPod(inputFile, fileFontId);
+    serialization::readPod(file, fileFontId);
-    serialization::readPod(inputFile, fileLineCompression);
+    serialization::readPod(file, fileLineCompression);
-    serialization::readPod(inputFile, fileMarginTop);
+    serialization::readPod(file, fileExtraParagraphSpacing);
-    serialization::readPod(inputFile, fileMarginRight);
+    serialization::readPod(file, fileParagraphAlignment);
-    serialization::readPod(inputFile, fileMarginBottom);
+    serialization::readPod(file, fileViewportWidth);
-    serialization::readPod(inputFile, fileMarginLeft);
+    serialization::readPod(file, fileViewportHeight);
-    serialization::readPod(inputFile, fileExtraParagraphSpacing);
+    serialization::readPod(file, fileHyphenationEnabled);
-    serialization::readPod(inputFile, fileHyphenationEnabled);
 
-    if (fontId != fileFontId || lineCompression != fileLineCompression || marginTop != fileMarginTop ||
+    if (fontId != fileFontId || lineCompression != fileLineCompression ||
-        marginRight != fileMarginRight || marginBottom != fileMarginBottom || marginLeft != fileMarginLeft ||
+        extraParagraphSpacing != fileExtraParagraphSpacing || paragraphAlignment != fileParagraphAlignment ||
-        extraParagraphSpacing != fileExtraParagraphSpacing || hyphenationEnabled != fileHyphenationEnabled) {
+        viewportWidth != fileViewportWidth || viewportHeight != fileViewportHeight || hyphenationEnabled != fileHyphenationEnabled) {
-      inputFile.close();
+      file.close();
       Serial.printf("[%lu] [SCT] Deserialization failed: Parameters do not match\n", millis());
       clearCache();
       return false;
     }
   }
 
-  serialization::readPod(inputFile, pageCount);
+  serialization::readPod(file, pageCount);
-  inputFile.close();
+  file.close();
   Serial.printf("[%lu] [SCT] Deserialization succeeded: %d pages\n", millis(), pageCount);
   return true;
 }
 
-void Section::setupCacheDir() const {
-  epub->setupCacheDir();
-  SD.mkdir(cachePath.c_str());
-}
-
 // Your updated class method (assuming you are using the 'SD' object, which is a wrapper for a specific filesystem)
 bool Section::clearCache() const {
-  if (!SD.exists(cachePath.c_str())) {
+  if (!SdMan.exists(filePath.c_str())) {
     Serial.printf("[%lu] [SCT] Cache does not exist, no action needed\n", millis());
     return true;
   }
 
-  if (!FsHelpers::removeDir(cachePath.c_str())) {
+  if (!SdMan.remove(filePath.c_str())) {
     Serial.printf("[%lu] [SCT] Failed to clear cache\n", millis());
     return false;
   }
@@ -116,50 +116,123 @@ bool Section::clearCache() const {
   return true;
 }
 
-bool Section::persistPageDataToSD(const int fontId, const float lineCompression, const int marginTop,
+bool Section::createSectionFile(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                  const int marginRight, const int marginBottom, const int marginLeft,
+                                const uint8_t paragraphAlignment, const uint16_t viewportWidth,
-                                  const bool extraParagraphSpacing, const bool hyphenationEnabled) {
+                                const uint16_t viewportHeight, const std::function<void()>& progressSetupFn,
+                                const std::function<void(int)>& progressFn, const bool hyphenationEnabled) {
+  constexpr uint32_t MIN_SIZE_FOR_PROGRESS = 50 * 1024;  // 50KB
   const auto localPath = epub->getSpineItem(spineIndex).href;
   const auto tmpHtmlPath = epub->getCachePath() + "/.tmp_" + std::to_string(spineIndex) + ".html";
-  File tmpHtml;
+
-  if (!FsHelpers::openFileForWrite("SCT", tmpHtmlPath, tmpHtml)) {
+  // Create cache directory if it doesn't exist
-    return false;
+  {
+    const auto sectionsDir = epub->getCachePath() + "/sections";
+    SdMan.mkdir(sectionsDir.c_str());
+  }
+
+  // Retry logic for SD card timing issues
+  bool success = false;
+  uint32_t fileSize = 0;
+  for (int attempt = 0; attempt < 3 && !success; attempt++) {
+    if (attempt > 0) {
+      Serial.printf("[%lu] [SCT] Retrying stream (attempt %d)...\n", millis(), attempt + 1);
+      delay(50);  // Brief delay before retry
+    }
+
+    // Remove any incomplete file from previous attempt before retrying
+    if (SdMan.exists(tmpHtmlPath.c_str())) {
+      SdMan.remove(tmpHtmlPath.c_str());
+    }
+
+    FsFile tmpHtml;
+    if (!SdMan.openFileForWrite("SCT", tmpHtmlPath, tmpHtml)) {
+      continue;
+    }
+    success = epub->readItemContentsToStream(localPath, tmpHtml, 1024);
+    fileSize = tmpHtml.size();
+    tmpHtml.close();
+
+    // If streaming failed, remove the incomplete file immediately
+    if (!success && SdMan.exists(tmpHtmlPath.c_str())) {
+      SdMan.remove(tmpHtmlPath.c_str());
+      Serial.printf("[%lu] [SCT] Removed incomplete temp file after failed attempt\n", millis());
+    }
   }
-  bool success = epub->readItemContentsToStream(localPath, tmpHtml, 1024);
-  tmpHtml.close();
 
   if (!success) {
-    Serial.printf("[%lu] [SCT] Failed to stream item contents to temp file\n", millis());
+    Serial.printf("[%lu] [SCT] Failed to stream item contents to temp file after retries\n", millis());
     return false;
   }
 
-  Serial.printf("[%lu] [SCT] Streamed temp HTML to %s\n", millis(), tmpHtmlPath.c_str());
+  Serial.printf("[%lu] [SCT] Streamed temp HTML to %s (%d bytes)\n", millis(), tmpHtmlPath.c_str(), fileSize);
 
-  ChapterHtmlSlimParser visitor(tmpHtmlPath, renderer, fontId, lineCompression, marginTop, marginRight, marginBottom,
+  // Only show progress bar for larger chapters where rendering overhead is worth it
-                                marginLeft, extraParagraphSpacing, hyphenationEnabled,
+  if (progressSetupFn && fileSize >= MIN_SIZE_FOR_PROGRESS) {
-                                [this](std::unique_ptr<Page> page) { this->onPageComplete(std::move(page)); });
+    progressSetupFn();
+  }
+
+  if (!SdMan.openFileForWrite("SCT", filePath, file)) {
+    return false;
+  }
+  writeSectionFileHeader(fontId, lineCompression, extraParagraphSpacing, paragraphAlignment, viewportWidth,
+                         viewportHeight, hyphenationEnabled);
+  std::vector<uint32_t> lut = {};
+
+  ChapterHtmlSlimParser visitor(
+      tmpHtmlPath, renderer, fontId, lineCompression, extraParagraphSpacing, hyphenationEnabled, paragraphAlignment, viewportWidth,
+      viewportHeight,
+      [this, &lut](std::unique_ptr<Page> page) { lut.emplace_back(this->onPageComplete(std::move(page))); },
+      progressFn);
   success = visitor.parseAndBuildPages();
 
-  SD.remove(tmpHtmlPath.c_str());
+  SdMan.remove(tmpHtmlPath.c_str());
   if (!success) {
     Serial.printf("[%lu] [SCT] Failed to parse XML and build pages\n", millis());
+    file.close();
+    SdMan.remove(filePath.c_str());
     return false;
   }
 
-  writeCacheMetadata(fontId, lineCompression, marginTop, marginRight, marginBottom, marginLeft, extraParagraphSpacing,
+  const uint32_t lutOffset = file.position();
-                     hyphenationEnabled);
+  bool hasFailedLutRecords = false;
+  // Write LUT
+  for (const uint32_t& pos : lut) {
+    if (pos == 0) {
+      hasFailedLutRecords = true;
+      break;
+    }
+    serialization::writePod(file, pos);
+  }
 
+  if (hasFailedLutRecords) {
+    Serial.printf("[%lu] [SCT] Failed to write LUT due to invalid page positions\n", millis());
+    file.close();
+    SdMan.remove(filePath.c_str());
+    return false;
+  }
+
+  // Go back and write LUT offset
+  file.seek(HEADER_SIZE - sizeof(uint32_t) - sizeof(pageCount));
+  serialization::writePod(file, pageCount);
+  serialization::writePod(file, lutOffset);
+  file.close();
   return true;
 }
 
-std::unique_ptr<Page> Section::loadPageFromSD() const {
+std::unique_ptr<Page> Section::loadPageFromSectionFile() {
-  const auto filePath = cachePath + "/page_" + std::to_string(currentPage) + ".bin";
+  if (!SdMan.openFileForRead("SCT", filePath, file)) {
-
-  File inputFile;
-  if (!FsHelpers::openFileForRead("SCT", filePath, inputFile)) {
     return nullptr;
   }
-  auto page = Page::deserialize(inputFile);
+
-  inputFile.close();
+  file.seek(HEADER_SIZE - sizeof(uint32_t));
+  uint32_t lutOffset;
+  serialization::readPod(file, lutOffset);
+  file.seek(lutOffset + sizeof(uint32_t) * currentPage);
+  uint32_t pagePos;
+  serialization::readPod(file, pagePos);
+  file.seek(pagePos);
+
+  auto page = Page::deserialize(file);
+  file.close();
   return page;
 }

lib/Epub/Epub/Section.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <functional>
 #include <memory>
 
 #include "Epub.h"
@@ -10,27 +11,29 @@ class Section {
   std::shared_ptr<Epub> epub;
   const int spineIndex;
   GfxRenderer& renderer;
-  std::string cachePath;
+  std::string filePath;
+  FsFile file;
 
-  void writeCacheMetadata(int fontId, float lineCompression, int marginTop, int marginRight, int marginBottom,
+  void writeSectionFileHeader(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
-                          int marginLeft, bool extraParagraphSpacing, bool hyphenationEnabled) const;
+                              uint16_t viewportWidth, uint16_t viewportHeight, bool hyphenationEnabled);
-  void onPageComplete(std::unique_ptr<Page> page);
+  uint32_t onPageComplete(std::unique_ptr<Page> page);
 
  public:
-  int pageCount = 0;
+  uint16_t pageCount = 0;
   int currentPage = 0;
 
   explicit Section(const std::shared_ptr<Epub>& epub, const int spineIndex, GfxRenderer& renderer)
       : epub(epub),
         spineIndex(spineIndex),
         renderer(renderer),
-        cachePath(epub->getCachePath() + "/" + std::to_string(spineIndex)) {}
+        filePath(epub->getCachePath() + "/sections/" + std::to_string(spineIndex) + ".bin") {}
   ~Section() = default;
-  bool loadCacheMetadata(int fontId, float lineCompression, int marginTop, int marginRight, int marginBottom,
+  bool loadSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
-                         int marginLeft, bool extraParagraphSpacing, bool hyphenationEnabled);
+                       uint16_t viewportWidth, uint16_t viewportHeight, bool hyphenationEnabled);
-  void setupCacheDir() const;
   bool clearCache() const;
-  bool persistPageDataToSD(int fontId, float lineCompression, int marginTop, int marginRight, int marginBottom,
+  bool createSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
-                           int marginLeft, bool extraParagraphSpacing, bool hyphenationEnabled);
+                         uint16_t viewportWidth, uint16_t viewportHeight,
-  std::unique_ptr<Page> loadPageFromSD() const;
+                         const std::function<void()>& progressSetupFn = nullptr,
+                         const std::function<void(int)>& progressFn = nullptr, bool hyphenationEnabled);
+  std::unique_ptr<Page> loadPageFromSectionFile();
 };