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#ifndef PNG_H
#define PNG_H
#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include "tinyff/result.h"
#include "tinyff/common.h"
static const unsigned char PNG_SIGNATURE[8] = {
0x89, 'P', 'N', 'G', 0x0D, 0x0A, 0x1A, 0x0A
};
typedef struct {
FILE *raw;
uint32_t width;
uint32_t height;
uint8_t bit_depth;
uint8_t color_type;
uint8_t *pixels;
size_t count_pixels;
bool valid;
} ff_png_ctx;
typedef enum {
FF_PNG_CHUNK_TYPE_IHDR,
FF_PNG_CHUNK_TYPE_PLTE,
FF_PNG_CHUNK_TYPE_IDAT,
FF_PNG_CHUNK_TYPE_IEND,
// There are more,
// but these ones will be
// enough for now
FF_PNG_CHUNK_TYPE_UNKNOWN,
} ff_png_chunk_type;
typedef struct {
uint32_t length;
ff_png_chunk_type type;
uint32_t *data; // length bytes (maximum is uint32_t)
uint32_t crc;
} ff_png_chunk;
ff_result ff_png_isvalid(FILE *file);
ff_result ff_open_png(const char *filepath, ff_png_ctx **out_ctx);
ff_result ff_next_chunk(FILE *file, ff_png_chunk **out_chunk);
#endif
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