diff options
| -rw-r--r-- | include/tinyff/image/png.h | 29 | ||||
| -rw-r--r-- | src/format/image/png.c | 37 |
2 files changed, 66 insertions, 0 deletions
diff --git a/include/tinyff/image/png.h b/include/tinyff/image/png.h new file mode 100644 index 0000000..caed675 --- /dev/null +++ b/include/tinyff/image/png.h @@ -0,0 +1,29 @@ +#ifndef PNG_H +#define PNG_H + +#include <stdint.h> +#include <stdio.h> +#include <stdbool.h> +#include <string.h> + +#include "tinyff/result.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; + +ff_result ff_png_isvalid(FILE *file); +ff_png_ctx *ff_open_png(const char *filepath); + +#endif diff --git a/src/format/image/png.c b/src/format/image/png.c new file mode 100644 index 0000000..b29e271 --- /dev/null +++ b/src/format/image/png.c @@ -0,0 +1,37 @@ +#include "tinyff/image/png.h" +#include "png.h" + +ff_result ff_png_isvalid(FILE *file) +{ + char raw_sig[8]; + if (fread(raw_sig, sizeof(char), 8, file) != 8) { + // Inable to read first 8 bytes + fclose(file); + return FF_RESULT_ERROR_INVALID_FILE; + } + + if (memcmp(raw_sig, PNG_SIGNATURE, 8) != 0) { + // Signiture did not match + fclose(file); + return FF_RESULT_ERROR_INVALID_FILE_SIGNITURE; + } + + return FF_RESULT_OK; +} + +ff_png_ctx *ff_open_png(const char *filepath) { + // Validate + + ff_png_ctx ctx; + ctx.raw = fopen(filepath, "rb"); + + if (!ctx.raw) { + return NULL; + } + + if (ff_png_isvalid(ctx.raw) != FF_RESULT_OK) { + return NULL; + } + + // TODO: Parse +}
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