Change opds parser interface

lib/OpdsParser/OpdsParser.cpp

@@ -22,9 +22,14 @@ OpdsParser::~OpdsParser() {
   }
 }
 
-void OpdsParser::push(const char* xmlData, const size_t length) {
+size_t OpdsParser::write(uint8_t c) {
+  return write(&c, 1);
+}
+
+size_t OpdsParser::write(const uint8_t* xmlData, const size_t length) {
+  Serial.printf("Got %d bytes to parse\n", length);
   if (errorOccured) {
-    return;
+    return length;
   }
 
   XML_SetUserData(parser, this);
@@ -32,7 +37,7 @@ void OpdsParser::push(const char* xmlData, const size_t length) {
   XML_SetCharacterDataHandler(parser, characterData);
 
   // Parse in chunks to avoid large buffer allocations
-  const char* currentPos = xmlData;
+  const char* currentPos = reinterpret_cast<const char*>(xmlData);
   size_t remaining = length;
   constexpr size_t chunkSize = 1024;
 
@@ -43,7 +48,7 @@ void OpdsParser::push(const char* xmlData, const size_t length) {
       Serial.printf("[%lu] [OPDS] Couldn't allocate memory for buffer\n", millis());
       XML_ParserFree(parser);
       parser = nullptr;
-      return;
+      return length;
     }
 
     const size_t toRead = remaining < chunkSize ? remaining : chunkSize;
@@ -55,7 +60,7 @@ void OpdsParser::push(const char* xmlData, const size_t length) {
                     XML_ErrorString(XML_GetErrorCode(parser)));
       XML_ParserFree(parser);
       parser = nullptr;
-      return;
+      return length;
     }
 
     currentPos += toRead;
@@ -63,7 +68,7 @@ void OpdsParser::push(const char* xmlData, const size_t length) {
   }
 }
 
-void OpdsParser::finish() {
+void OpdsParser::flush() {
   if (XML_Parse(parser, nullptr, 0, XML_TRUE) != XML_STATUS_OK) {
     errorOccured = true;
     XML_ParserFree(parser);

lib/OpdsParser/OpdsParser.h

@@ -3,6 +3,7 @@
 
 #include <string>
 #include <vector>
+#include "Print.h"
 
 /**
  * Type of OPDS entry.
@@ -42,7 +43,7 @@ using OpdsBook = OpdsEntry;
  *     }
  *   }
  */
-class OpdsParser {
+class OpdsParser final : public Print {
  public:
   OpdsParser();
   ~OpdsParser();
@@ -51,10 +52,17 @@ class OpdsParser {
   OpdsParser(const OpdsParser&) = delete;
   OpdsParser& operator=(const OpdsParser&) = delete;
 
-  void push(const char* xmlData, size_t length);
-  void finish();
+  size_t write(uint8_t) override;
+  size_t write(const uint8_t*, size_t) override;
+
+  void flush() override;
+
   bool error() const;
 
+  operator bool() {
+    return !error();
+  }
+
   /**
    * Get the parsed entries (both navigation and book entries).
    * @return Vector of OpdsEntry entries

lib/OpdsParser/OpdsStream.cpp

@@ -9,13 +9,11 @@ int OpdsParserStream::peek() { abort(); }
 int OpdsParserStream::read() { abort(); }
 
 size_t OpdsParserStream::write(uint8_t c) {
-  parser.push(reinterpret_cast<const char*>(&c), 1);
-  return 1;
+  return parser.write(c);
 }
 
 size_t OpdsParserStream::write(const uint8_t* buffer, size_t size) {
-  parser.push(reinterpret_cast<const char*>(buffer), size);
-  return size;
+  return parser.write(buffer, size);
 }
 
-OpdsParserStream::~OpdsParserStream() { parser.finish(); }
+OpdsParserStream::~OpdsParserStream() { parser.flush(); }

src/activities/browser/OpdsBookBrowserActivity.cpp

@@ -17,7 +17,7 @@
 namespace {
 constexpr int PAGE_ITEMS = 23;
 constexpr int SKIP_PAGE_MS = 700;
-constexpr char OPDS_ROOT_PATH[] = "opds";  // No leading slash - relative to server URL
+constexpr char OPDS_ROOT_PATH[] = "api/opds/c7f8522c-5539-4f60-b978-3626a33245b6";  // No leading slash - relative to server URL
 }  // namespace
 
 void OpdsBookBrowserActivity::taskTrampoline(void* param) {
@@ -277,7 +277,7 @@ void OpdsBookBrowserActivity::fetchFeed(const std::string& path) {
     }
   }
 
-  if (parser.error()) {
+  if (!parser) {
     state = BrowserState::ERROR;
     errorMessage = "Failed to parse feed";
     updateRequired = true;