mirror of
https://github.com/openclaw/openclaw.git
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0ed4f8a72b
* fix(media): cap oversized image inputs * chore(changelog): add media input guard note * fix(media): address input guard review feedback * fix(media): fail closed on unknown sips dimensions * fix(media): avoid sips fallback in input guard
52 lines
1.5 KiB
TypeScript
52 lines
1.5 KiB
TypeScript
export function createPngBufferWithDimensions(params: { width: number; height: number }): Buffer {
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const signature = Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]);
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const ihdrLength = Buffer.from([0x00, 0x00, 0x00, 0x0d]);
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const ihdrType = Buffer.from("IHDR", "ascii");
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const ihdrData = Buffer.alloc(13);
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ihdrData.writeUInt32BE(params.width, 0);
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ihdrData.writeUInt32BE(params.height, 4);
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ihdrData[8] = 8;
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ihdrData[9] = 6;
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const ihdrCrc = Buffer.alloc(4);
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const iend = Buffer.from([
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0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82,
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]);
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return Buffer.concat([signature, ihdrLength, ihdrType, ihdrData, ihdrCrc, iend]);
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}
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export function createJpegBufferWithDimensions(params: { width: number; height: number }): Buffer {
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if (params.width > 0xffff || params.height > 0xffff) {
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throw new Error("Synthetic JPEG helper only supports 16-bit dimensions");
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}
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const app0 = Buffer.from([
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0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01,
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0x00, 0x00,
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]);
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const sof0 = Buffer.from([
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0xff,
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0xc0,
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0x00,
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0x11,
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0x08,
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params.height >> 8,
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params.height & 0xff,
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params.width >> 8,
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params.width & 0xff,
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0x03,
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0x01,
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0x11,
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0x00,
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0x02,
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0x11,
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0x00,
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0x03,
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0x11,
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0x00,
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]);
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const sos = Buffer.from([
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0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00,
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]);
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return Buffer.concat([Buffer.from([0xff, 0xd8]), app0, sof0, sos, Buffer.from([0xff, 0xd9])]);
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}
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