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Ensure that the peekByte methods, on the various Streams, handles end of data correctly (PR 5286 follow-up)

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When the end of data has already been reached for the various Streams, the `getByte` methods will return `-1` to signal that to the caller. Note however that the current position obviously won't be incremented in this case, meaning that the `peekByte` methods will in this case *incorrectly* decrement the position.

Thankfully the corresponding `peekBytes` shouldn't be affected by this bug, since they decrement the current position with the *actually* returned number of bytes.

I'm not aware of any bugs caused by this blatant oversight, but that doesn't mean this shouldn't be fixed :-)
This commit is contained in:
Jonas Jenwald 2019-11-01 17:53:32 +01:00
parent 30ef05c161
commit 829d6ba2dc
2 changed files with 9 additions and 3 deletions
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4
src/core/chunked_stream.js
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@ -213,7 +213,9 @@ class ChunkedStream {
peekByte() {
const peekedByte = this.getByte();
this.pos--;
if (peekedByte !== -1) {
this.pos--;
}
return peekedByte;
}

8
src/core/stream.js
View file

@ -86,7 +86,9 @@ var Stream = (function StreamClosure() {
},
peekByte: function Stream_peekByte() {
var peekedByte = this.getByte();
this.pos--;
if (peekedByte !== -1) {
this.pos--;
}
return peekedByte;
},
peekBytes(length, forceClamped = false) {
@ -234,7 +236,9 @@ var DecodeStream = (function DecodeStreamClosure() {
},
peekByte: function DecodeStream_peekByte() {
var peekedByte = this.getByte();
this.pos--;
if (peekedByte !== -1) {
this.pos--;
}
return peekedByte;
},
peekBytes(length, forceClamped = false) {