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#include "tinyff/image/bmp.h"
#include "tinyff/dbg.h"
ff_result ff_bmp_isvalid(ff_stream* stream)
{
ff_dprintf("png: validating signature\n");
char raw_sig[2];
if (stream->read(raw_sig, 2, stream->user) != 2) {
ff_dprintf("bmp: failed to read signature bytes\n");
return FF_RESULT_ERROR_INVALID_FILE;
}
ff_dprintf(
"bmp: signature read: %02X %02X \n",
raw_sig[0], raw_sig[1]
);
if (memcmp(raw_sig, BMP_SIGNATURE, 2) != 0) {
ff_dprintf("bmp: signature mismatch\n");
return FF_RESULT_ERROR_INVALID_PNG_SIGNATURE;
}
ff_dprintf("bmp: signature valid\n");
return FF_RESULT_OK;
}
ff_result ff_open_bmp(ff_stream *stream, ff_bmp_ctx **out_ctx)
{
ff_bmp_ctx *ctx = malloc(sizeof(ff_bmp_ctx));
if (!ctx) return FF_RESULT_ERROR_MEMORY_ALLOCATION;
// Init
memset(ctx, 0, sizeof(*ctx));
ctx->raw = stream;
ctx->last_error = FF_RESULT_OK;
if (ctx->raw->read == NULL) {
ff_dprintf("bmp: stream failed to read\n");
free(ctx);
ctx->last_error = FF_RESULT_ERROR_READ_FILE_FAILURE;
return FF_RESULT_ERROR_READ_FILE_FAILURE;
}
ff_dprintf("bmp: stream read successfully\n");
ff_result res = ff_bmp_isvalid(ctx->raw);
if (res != FF_RESULT_OK) {
ff_dprintf("bmp: validation failed (%d)\n", res);
free(ctx);
ctx->last_error = res;
return res;
}
ff_dprintf("bmp: validation passed\n");
ctx->valid = true;
*out_ctx = ctx;
ff_dprintf("bmp: open_bmp reached WIP end\n");
return FF_RESULT_WARN_NO_IMPL;
}
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