46 lines
1.0 KiB
JavaScript
46 lines
1.0 KiB
JavaScript
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// reduce buffer size, avoiding mem copy
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export function shrinkBuf (buf, size) {
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if (buf.length === size) { return buf; }
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if (buf.subarray) { return buf.subarray(0, size); }
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buf.length = size;
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return buf;
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};
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export function arraySet (dest, src, src_offs, len, dest_offs) {
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if (src.subarray && dest.subarray) {
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dest.set(src.subarray(src_offs, src_offs + len), dest_offs);
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return;
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}
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// Fallback to ordinary array
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for (var i = 0; i < len; i++) {
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dest[dest_offs + i] = src[src_offs + i];
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}
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}
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// Join array of chunks to single array.
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export function flattenChunks (chunks) {
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var i, l, len, pos, chunk, result;
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// calculate data length
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len = 0;
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for (i = 0, l = chunks.length; i < l; i++) {
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len += chunks[i].length;
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}
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// join chunks
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result = new Uint8Array(len);
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pos = 0;
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for (i = 0, l = chunks.length; i < l; i++) {
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chunk = chunks[i];
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result.set(chunk, pos);
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pos += chunk.length;
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}
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return result;
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}
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export var Buf8 = Uint8Array;
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export var Buf16 = Uint16Array;
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export var Buf32 = Int32Array;
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