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opencode-agent[bot]
30 lines
1.0 KiB
TypeScript
30 lines
1.0 KiB
TypeScript
export const dimensions = (data: Uint8Array) => {
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if (data[0] === 0x89 && data[1] === 0x50 && data[2] === 0x4e && data[3] === 0x47)
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return {
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width: readUint32(data, 16),
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height: readUint32(data, 20),
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}
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if (data[0] === 0xff && data[1] === 0xd8) {
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for (let offset = 2; offset + 8 < data.length; ) {
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if (data[offset] !== 0xff) {
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offset++
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continue
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}
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const marker = data[offset + 1]
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if (
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marker !== undefined &&
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[0xc0, 0xc1, 0xc2, 0xc3, 0xc5, 0xc6, 0xc7, 0xc9, 0xca, 0xcb, 0xcd, 0xce, 0xcf].includes(marker)
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)
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return {
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width: (data[offset + 7] << 8) | data[offset + 8],
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height: (data[offset + 5] << 8) | data[offset + 6],
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}
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offset += 2 + ((data[offset + 2] << 8) | data[offset + 3])
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}
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}
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throw new Error("Unsupported image fixture format")
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}
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const readUint32 = (data: Uint8Array, offset: number) =>
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((data[offset] << 24) | (data[offset + 1] << 16) | (data[offset + 2] << 8) | data[offset + 3]) >>> 0
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