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Don't throw when there isn't enough data to get block info in flate stream

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but just ends the stream.
This commit is contained in:
Calixte Denizet 2023-11-26 17:32:52 +01:00
parent 9d863f5180
commit 52ea20eda4
3 changed files with 24 additions and 5 deletions
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19
src/core/flate_stream.js
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@ -19,8 +19,8 @@
* license.
*/
import { FormatError, info } from "../shared/util.js";
import { DecodeStream } from "./decode_stream.js";
import { FormatError } from "../shared/util.js";
const codeLenCodeMap = new Int32Array([
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15,
@ -238,6 +238,11 @@ class FlateStream extends DecodeStream {
return [codes, maxLen];
}
#endsStreamOnError(err) {
info(err);
this.eof = true;
}
readBlock() {
let buffer, len;
const str = this.str;
@ -253,19 +258,23 @@ class FlateStream extends DecodeStream {
let b;
if ((b = str.getByte()) === -1) {
throw new FormatError("Bad block header in flate stream");
this.#endsStreamOnError("Bad block header in flate stream");
return;
}
let blockLen = b;
if ((b = str.getByte()) === -1) {
throw new FormatError("Bad block header in flate stream");
this.#endsStreamOnError("Bad block header in flate stream");
return;
}
blockLen |= b << 8;
if ((b = str.getByte()) === -1) {
throw new FormatError("Bad block header in flate stream");
this.#endsStreamOnError("Bad block header in flate stream");
return;
}
let check = b;
if ((b = str.getByte()) === -1) {
throw new FormatError("Bad block header in flate stream");
this.#endsStreamOnError("Bad block header in flate stream");
return;
}
check |= b << 8;
if (check !== (~blockLen & 0xffff) && (blockLen !== 0 || check !== 0)) {