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export default class ChunkCache {
private chunks: Array<Uint8Array> = [];
public dataLength: number = 0;
push(chunk: Uint8Array) {
this.chunks.push(chunk);
this.dataLength += chunk.length;
}
flush(): Uint8Array {
const { chunks, dataLength } = this;
let result;
if (!chunks.length) {
return new Uint8Array(0);
} else if (chunks.length === 1) {
result = chunks[0];
} else {
result = concatUint8Arrays(chunks, dataLength);
}
this.reset();
return result;
}
reset() {
this.chunks.length = 0;
this.dataLength = 0;
}
}
function concatUint8Arrays(
chunks: Array<Uint8Array>,
dataLength: number
): Uint8Array {
const result = new Uint8Array(dataLength);
let offset = 0;
for (let i = 0; i < chunks.length; i++) {
const chunk = chunks[i];
result.set(chunk, offset);
offset += chunk.length;
}
return result;
}