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@@ -138,8 +138,8 @@ const bits16 = (d: Uint8Array, p: number) => {
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const inflt = (dat: Uint8Array, buf?: Uint8Array) => {
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// have to estimate size
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const noBuf = !buf;
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- // Slightly less than 2x - assumes ~60% compression ratio
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- if (noBuf) buf = new u8((dat.length >>> 2) << 3);
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+ // 4x - assumes ~25% compression ratio
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+ if (noBuf) buf = new u8(dat.length << 2);
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// ensure buffer can fit at least l elements
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const cbuf = (l: number) => {
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let bl = buf.length;
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@@ -166,13 +166,13 @@ const inflt = (dat: Uint8Array, buf?: Uint8Array) => {
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if (!type) {
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// go to end of byte boundary
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if (pos & 7) pos += 8 - (pos & 7);
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- const s = (pos >>> 3) + 4, l = dat[s - 4] | (dat[s - 3] << 8);
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+ let s = (pos >>> 3) + 4, l = dat[s - 4] | (dat[s - 3] << 8);
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// ensure size
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if (noBuf) cbuf(bt + l);
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// Copy over uncompressed data
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- buf.set(dat.subarray(s, s + l), bt);
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+ for (let m = s + l; s < m; ++s) buf[bt++] = dat[s];
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// Get new bitpos, update byte count
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- pos = (s + l) << 3, bt += l;
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+ pos = s << 3;
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continue;
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}
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// Make sure the buffer can hold this + the largest possible addition
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@@ -488,7 +488,7 @@ const wblk = (dat: Uint8Array, out: Uint8Array, final: number, syms: Uint32Array
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}
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// deflate options (nice << 13) | chain
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-const deo = new u32([65540, 131080, 131088, 131104, 262176, 1048704, 1048832, 2114560, 2117632]);
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+const deo = /*#__PURE__*/new u32([65540, 131080, 131088, 131104, 262176, 1048704, 1048832, 2114560, 2117632]);
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// compresses data into a raw DEFLATE buffer
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const dflt = (dat: Uint8Array, lvl: number, plvl: number, pre: number, post: number) => {
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@@ -724,7 +724,7 @@ export function gunzip(data: Uint8Array, out?: Uint8Array) {
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let st = 10 + (flg & 2);
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if (flg & 4) st += data[10] | (data[11] << 8) + 2;
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for (let zs = (flg >> 3 & 1) + (flg >> 4 & 1); zs > 0; zs -= (data[st++] == 0) as unknown as number);
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- if (!out) out = new Uint8Array(data[l - 4] | data[l - 3] << 8 | data[l - 2] << 16 | data[l - 1] << 24);
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+ if (!out) out = new u8(data[l - 4] | data[l - 3] << 8 | data[l - 2] << 16 | data[l - 1] << 24);
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return inflt(data.subarray(st, -8), out);
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}
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Arjun Barrett