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Use getBytes, rather than looping over getByte, in FlateStream.prototype.readBlock

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*Please note:* A a similar change was attempted in PR 5005, but it was subsequently backed out (in PR 5069) since other parts of the patch caused issues.

With these changes, it's possible to replace repeated function calls within a loop with just a single function call and subsequent assignment instead.
This commit is contained in:
Jonas Jenwald 2019-11-15 15:35:22 +01:00
parent f7aafcb218
commit 688d15526e
1 changed files with 7 additions and 9 deletions
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16
src/core/stream.js
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@ -580,21 +580,19 @@ var FlateStream = (function FlateStreamClosure() {
this.codeBuf = 0;
this.codeSize = 0;
var bufferLength = this.bufferLength;
buffer = this.ensureBuffer(bufferLength + blockLen);
var end = bufferLength + blockLen;
const bufferLength = this.bufferLength, end = bufferLength + blockLen;
buffer = this.ensureBuffer(end);
this.bufferLength = end;
if (blockLen === 0) {
if (str.peekByte() === -1) {
this.eof = true;
}
} else {
for (var n = bufferLength; n < end; ++n) {
if ((b = str.getByte()) === -1) {
this.eof = true;
break;
}
buffer[n] = b;
const block = str.getBytes(blockLen);
buffer.set(block, bufferLength);
if (block.length < blockLen) {
this.eof = true;
}
}
return;