mirrors/pdf.js
1
0
Fork 0
mirror of https://github.com/mozilla/pdf.js.git synced 2025-04-25 17:48:07 +02:00
Code Activity

Adjust the heuristics for handling of incomplete path operators (issue 14917)

Browse source 
This limits the heuristics for handling of incomplete path operators, see PR 9838, to only apply to *sequences* of such operators. In practice a couple of invalid path operators are (hopefully) unlikely to completely break rendering, whereas a sequence of them will easily lead to fairly chaotic rendering artifacts.
This commit is contained in:
Jonas Jenwald 2022-05-15 11:12:00 +02:00
parent 46e4a305eb
commit 5a774b7ed3
3 changed files with 18 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/core/evaluator.js
View file

@ -4765,6 +4765,7 @@ class EvaluatorPreprocessor {
});
this.stateManager = stateManager;
this.nonProcessedArgs = [];
this._isPathOp = false;
this._numInvalidPathOPS = 0;
}
@ -4810,6 +4811,13 @@ class EvaluatorPreprocessor {
const numArgs = opSpec.numArgs;
let argsLength = args !== null ? args.length : 0;
// If the *previous* command wasn't a path operator, reset the heuristic
// used with incomplete path operators below (fixes issue14917.pdf).
if (!this._isPathOp) {
this._numInvalidPathOPS = 0;
}
this._isPathOp = fn >= OPS.moveTo && fn <= OPS.endPath;
if (!opSpec.variableArgs) {
// Postscript commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
if (argsLength !== numArgs) {
@ -4837,8 +4845,7 @@ class EvaluatorPreprocessor {
// used to error, rather than just warn, once a number of invalid
// path operators have been encountered (fixes bug1443140.pdf).
if (
fn >= OPS.moveTo &&
fn <= OPS.endPath && // Path operator
this._isPathOp &&
++this._numInvalidPathOPS >
EvaluatorPreprocessor.MAX_INVALID_PATH_OPS
) {