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Avoid hanging the worker-thread for CMap data with ridiculously large ranges (issue 11922)

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This patch was inspired by ad2b64f124/xpdf/CharCodeToUnicode.cc (L480-L484)
This commit is contained in:
Jonas Jenwald 2020-05-22 14:07:28 +02:00
parent 4a3a24b002
commit 56ebf01ae0
4 changed files with 10492 additions and 0 deletions
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13
src/core/cmap.js
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@ -198,6 +198,10 @@ var BUILT_IN_CMAPS = [
"WP-Symbol",
];
// Heuristic to avoid hanging the worker-thread for CMap data with ridiculously
// large ranges, such as e.g. 0xFFFFFFFF (fixes issue11922_reduced.pdf).
const MAX_MAP_RANGE = 2 ** 24 - 1; // = 0xFFFFFF
// CMap, not to be confused with TrueType's cmap.
class CMap {
constructor(builtInCMap = false) {
@ -223,12 +227,18 @@ class CMap {
}
mapCidRange(low, high, dstLow) {
if (high - low > MAX_MAP_RANGE) {
throw new Error("mapCidRange - ignoring data above MAX_MAP_RANGE.");
}
while (low <= high) {
this._map[low++] = dstLow++;
}
}
mapBfRange(low, high, dstLow) {
if (high - low > MAX_MAP_RANGE) {
throw new Error("mapBfRange - ignoring data above MAX_MAP_RANGE.");
}
var lastByte = dstLow.length - 1;
while (low <= high) {
this._map[low++] = dstLow;
@ -240,6 +250,9 @@ class CMap {
}
mapBfRangeToArray(low, high, array) {
if (high - low > MAX_MAP_RANGE) {
throw new Error("mapBfRangeToArray - ignoring data above MAX_MAP_RANGE.");
}
const ii = array.length;
let i = 0;
while (low <= high && i < ii) {