From 08db1dc9428ea5bc9604b229d686af1414d461af Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Tue, 5 Sep 2023 01:31:24 -0400
Subject: little size compeitino

---
 examples/wasm-png/src/lib.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 examples/wasm-png/src/lib.rs

(limited to 'examples/wasm-png/src')

diff --git a/examples/wasm-png/src/lib.rs b/examples/wasm-png/src/lib.rs
new file mode 100644
index 0000000..1c3c150
--- /dev/null
+++ b/examples/wasm-png/src/lib.rs
@@ -0,0 +1,17 @@
+#[no_mangle]
+pub unsafe fn decode_png(input: *const u8, input_len: usize, output: *mut u8, output_len: usize) -> usize {
+	let input = core::slice::from_raw_parts(input, input_len);
+	let output = core::slice::from_raw_parts_mut(output, output_len);
+	
+	let decoder = png::Decoder::new(input);
+	let Ok(mut reader) = decoder.read_info() else {
+		return 0;
+	};
+	let required_bytes = reader.output_buffer_size();
+	if output_len >= required_bytes {
+		if reader.next_frame(output).is_err() {
+			return 0;
+		}
+	}
+	required_bytes
+}
-- 
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