feat(bmp): Implement ff_open_bmp function for BMP context initialization

2 files changed, 45 insertions, 0 deletions

diff --git a/include/tinyff/image/bmp.h b/include/tinyff/image/bmp.h
index 8c4fd56..6381cea 100644
--- a/include/tinyff/image/bmp.h
+++ b/include/tinyff/image/bmp.h
@@ -17,6 +17,10 @@ static const unsigned char BMP_SIGNATURE[2] = {
 };
 
 typedef struct {
+    // Raw stream handle
+    ff_stream *raw;
+
+    
     uint32_t file_size; // tbh, i actually have no idea why this is needed
     uint32_t data_offset;
     
@@ -34,6 +38,9 @@ typedef struct {
     
     uint8_t* pixels;
     
+
+    bool valid;
+    ff_result last_error;
 } ff_bmp_ctx;
 
 ff_result ff_bmp_isvalid(ff_stream *stream);
diff --git a/src/format/image/bmp.c b/src/format/image/bmp.c
index d947a83..d1d343c 100644
--- a/src/format/image/bmp.c
+++ b/src/format/image/bmp.c
@@ -24,4 +24,42 @@ ff_result ff_bmp_isvalid(ff_stream* stream)
 
     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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