Sprinter-SDCC/applications/PoP/roomtest/pop_qsave.c

/*
 * pop_qsave.c — файловая транзакция и схема игрового снимка.
 * Живёт в холодном банке: в обычном кадре исполняется только проверка
 * резидентного флага запроса, вся тяжёлая работа бывает по F6/F9.
 */
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>                 /* rename */
#include <sprinter_mem.h>
#include <sprite.h>
#include "pop_qsave.h"
#include "pop_kid.h"
#include "pop_guard.h"
#include "pop_map.h"
#include "pop_level.h"
#include "pop_trob.h"
#include "pop_bg.h"
#include "pop_state.h"
#include "pop_tile.h"
#include "pop_sfx.h"
#include "pop_pace.h"
#include "roomtest_cold.h"

#define QS_VERSION 3
#define QS_SAVE 1
#define QS_LOAD 2
#define QS_LIMIT 4096
#define QS_BASE 0x100

extern uint8_t pop_qsave_request;

static void qs_char(pop_qs_io_t *io, pop_char_t *c)
{
    pop_qs_u8(io, &c->frame); pop_qs_u8(io, &c->x); pop_qs_u8(io, &c->y);
    pop_qs_i8(io, &c->direction); pop_qs_i8(io, &c->curr_col);
    pop_qs_i8(io, &c->curr_row); pop_qs_u8(io, &c->action);
    pop_qs_i8(io, &c->fall_x); pop_qs_i8(io, &c->fall_y);
    pop_qs_u8(io, &c->room); pop_qs_u8(io, &c->repeat);
    pop_qs_u8(io, &c->charid); pop_qs_u8(io, &c->sword);
    pop_qs_i8(io, &c->alive); pop_qs_u16(io, &c->curr_seq);
}

static void qs_payload(pop_qs_io_t *io)
{
    uint8_t speed=pop_speed_mode, immortal=pop_immortal, sound=pop_snd_want;

    /* Пользовательские параметры входят в снимок, а не остаются свойством
     * текущего запуска.  Читаем сначала во временные байты: повреждённые
     * значения не должны частично применить остальное игровое состояние. */
    pop_qs_u8(io, &speed); pop_qs_u8(io, &immortal); pop_qs_u8(io, &sound);
    if (io->reading && io->apply) {
        if (speed >= POP_SPEED_MODES || immortal > 2 || sound > 1) {
            io->failed=1; return;
        }
        pop_speed_mode=speed; pop_immortal=immortal; pop_snd_want=sound;
    }

    qs_char(io, &Kid); qs_char(io, &Guard);
    pop_qs_u8(io, &cur_room); pop_qs_u8(io, &kid_room);
    pop_qs_u8(io, &pop_checkpoint); pop_qs_u8(io, &pop_next_level);
    pop_qs_i8(io, &knock);

    pop_qs_u8(io, &hitp_curr); pop_qs_u8(io, &hitp_max);
    pop_qs_u8(io, &hitp_beg_lev); pop_qs_i8(io, &hitp_delta);
    pop_qs_u8(io, &guardhp_curr); pop_qs_u8(io, &guardhp_max);
    pop_qs_i8(io, &guardhp_delta); pop_qs_u8(io, &guard_skill);
    pop_qs_i8(io, &guard_refrac); pop_qs_i8(io, &justblocked);
    pop_qs_i8(io, &kid_sword_strike); pop_qs_i8(io, &offguard);
    pop_qs_i8(io, &holding_sword); pop_qs_u8(io, &pop_guard_hurt);
    pop_qs_i8(io, &can_guard_see_kid); pop_qs_i8(io, &is_guard_notice);
    pop_qs_i8(io, &pop_united_shadow); pop_qs_u8(io, &pop_shadow_init);
    pop_qs_i8(io, &pop_guard_notice_timer);
    pop_qs_u16(io, &pop_fight_seed.lo); pop_qs_u16(io, &pop_fight_seed.hi);

    pop_qs_u8(io, &pop_kid_dead); pop_qs_u8(io, &pop_kid_hurt);
    pop_qs_u8(io, &pop_have_sword); pop_qs_u8(io, &pop_item_taken);
    pop_qs_u8(io, &pop_flash_time); pop_qs_u8(io, &pop_flash_color);
    pop_qs_u8(io, &pop_feather); pop_qs_u8(io, &pop_upside);
    pop_qs_u8(io, &pop_upside_want); pop_qs_u8(io, &pop_upside_dirty);
    pop_qs_u8(io, &pop_leave_dir); pop_qs_u8(io, &pop_leave_timer);
    pop_qs_u8(io, &pop_loose_fell); pop_qs_u8(io, &pop_ceil_fell);
    pop_qs_u8(io, &pop_debris_at); pop_qs_u8(io, &pop_fell_out);
    pop_qs_bytes(io, pop_loose_modif, sizeof(pop_loose_modif));
    pop_qs_bytes(io, pop_ceil_modif, sizeof(pop_ceil_modif));

    pop_qs_u8(io, &pop_loose_landed); pop_qs_u8(io, &pop_loose_exit);
    pop_qs_u8(io, &pop_loose_exit_room); pop_qs_u8(io, &pop_droppedout);
    pop_qs_u16(io, &pop_leveldoor_open); pop_qs_i8(io, &pop_jumped_mirror);
    pop_qs_u8(io, &pop_seamless); pop_qs_u8(io, &pop_nav_hold);

    pop_level_qsave(io);
    pop_trob_qsave(io);
    pop_loose_mob_qsave(io);
    pop_map_qsave(io);
    pop_guard_ai_qsave(io);
}

static void qs_init(pop_qs_io_t *io, uint8_t page, uint16_t limit,
                    uint8_t reading, uint8_t apply)
{
    io->page=page; io->pos=QS_BASE; io->limit=(uint16_t)(QS_BASE+limit);
    io->checksum=0;
    io->count=0; io->reading=reading; io->apply=apply; io->failed=0;
}

static uint8_t qs_header_read(pop_qs_io_t *io, uint8_t *level)
{
    uint8_t h[7];
    if (!pop_qs_raw_get(io,h,sizeof(h))) return 0;
    if (h[0]!='P' || h[1]!='O' || h[2]!='P' || h[3]!='Q' ||
        h[4] != QS_VERSION || h[5] < 1 || h[5] > 15 || h[6] != 0) return 0;
    *level = h[5]; return 1;
}

static uint8_t qs_validate_page(uint8_t page, uint16_t size,
                                uint8_t *level, uint16_t *payload_size)
{
    pop_qs_io_t io;
    uint8_t tail[4];
    uint16_t n, sum;
    if (size < 11) return 0;
    qs_init(&io,page,size,1,0);
    if (!qs_header_read(&io,level)) return 0;
    io.pos=(uint16_t)(QS_BASE+size-4);
    if (!pop_qs_raw_get(&io,tail,4)) return 0;
    n = (uint16_t)(tail[0] | ((uint16_t)tail[1] << 8));
    sum = (uint16_t)(tail[2] | ((uint16_t)tail[3] << 8));
    if (n != (uint16_t)(size-11) ||
        sum != pop_qs_checksum_page(page,QS_BASE+7,n)) return 0;
    *payload_size=n; return 1;
}

static uint8_t qs_apply(uint8_t page, uint16_t size, uint16_t payload_size,
                        uint8_t *level)
{
    pop_qs_io_t io;
    qs_init(&io,page,size,1,1);
    if (!qs_header_read(&io,level)) return 0;
    qs_payload(&io);
    return (uint8_t)(!io.failed && io.count == payload_size &&
                     io.pos == (uint16_t)(QS_BASE+7+payload_size));
}

static int8_t qs_save(uint8_t page)
{
    pop_qs_io_t io;
    uint8_t tail[4];
    const uint8_t h[7]={'P','O','P','Q',QS_VERSION,pop_current_level,0};
    uint16_t size;
    qs_init(&io,page,QS_LIMIT,0,0);
    pop_qs_raw_put(&io,h,sizeof(h));
    qs_payload(&io);
    tail[0]=(uint8_t)io.count; tail[1]=(uint8_t)(io.count >> 8);
    io.checksum=pop_qs_checksum_page(page,QS_BASE+7,io.count);
    tail[2]=(uint8_t)io.checksum; tail[3]=(uint8_t)(io.checksum >> 8);
    pop_qs_raw_put(&io,tail,4); size=(uint16_t)(io.pos-QS_BASE);
    if (io.failed) return -1;
    unlink("POP.NEW");
    if (bank_save_file(page,QS_BASE,"POP.NEW",size) != size) {
        unlink("POP.NEW"); return -1;
    }
    unlink("POP.BAK");
    (void)rename("POP.SAV", "POP.BAK");
    if (rename("POP.NEW", "POP.SAV") != 0) {
        (void)rename("POP.BAK", "POP.SAV"); return -1;
    }
    return 1;
}

static int8_t qs_load_one(const char *name, uint8_t page)
{
    uint8_t level;
    uint16_t payload_size;
    int size=bank_load_file(page,QS_BASE,name,QS_LIMIT);
    if (size <= 0 || !qs_validate_page(page,(uint16_t)size,&level,
                                       &payload_size)) return -1;
    if (level != pop_current_level) {
        pop_next_level = level;
        if (pop_level_switch() != 0 || pop_current_level != level) return -1;
    }
    if (!qs_apply(page,(uint16_t)size,payload_size,&level)) return -1;
    Char = Kid; Opp = Guard;
    pop_qsave_restore_room(cur_room);
    return 1;
}

int8_t pop_qsave_process(void) __banked
{
    uint8_t request = pop_qsave_request;
    uint8_t blk,page;
    int8_t rc=-1;
    pop_qsave_request = 0;
    if (!request) return 0;
    blk=mem_alloc_pages(1);
    if (!blk) return -1;
    page=mem_get_page(blk,0);
    gfx_w0_page_prepare(page);
    pop_sfx_pause();
    if (request == QS_SAVE) rc = qs_save(page);
    else {
        rc = qs_load_one("POP.SAV",page);
        if (rc < 0) rc = qs_load_one("POP.BAK",page);
    }
    pop_sfx_start();
    mem_free_block(blk);
    return rc;
}