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fix(mcap): support LZ4 frame compression in MCAP decompress handler #18

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Merged
joaner merged 1 commit into from
Jul 3, 2026
Merged

fix(mcap): support LZ4 frame compression in MCAP decompress handler #18

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11 changes: 11 additions & 0 deletions src/infra/sources/decompressHandlers.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,17 @@ export async function loadDecompressHandlers(

return {
lz4: (buffer, decompressedSize) => {
// Check if it is an LZ4 frame (magic number 0x184D2204)
if (
buffer.length >= 4 &&
buffer[0] === 0x04 &&
buffer[1] === 0x22 &&
buffer[2] === 0x4d &&
buffer[3] === 0x18
) {
return lz4js.decompress(buffer);
}

const output = new Uint8Array(Number(decompressedSize));
const result = lz4js.decompressBlock(buffer, output, 0, buffer.byteLength, 0);
if (result < 0) {
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