From a65f99a64e1937411a9268213c55f1b030df7af5 Mon Sep 17 00:00:00 2001
From: Garden <gardendistrict0x0@outlook.com>
Date: Thu, 18 Dec 2025 21:14:42 +1100
Subject: feat(png): Validate signiture header

---
 include/tinyff/image/png.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 include/tinyff/image/png.h

(limited to 'include/tinyff/image/png.h')

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
-- 
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