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Let Lexer.getNumber treat more invalid "numbers" as zero (issue 15604)

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In the referenced PDF document there are "numbers" which consist only of `-.`, and while that's obviously not valid Adobe Reader seems to handle it just fine.
Letting this method ignore more invalid "numbers" was suggested during the review of PR 14543, so let's simply relax our the validation here.
This commit is contained in:
Jonas Jenwald 2022-10-20 19:40:25 +02:00
parent 7dc16c237a
commit 71bd8b4de9
4 changed files with 24 additions and 22 deletions
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20
src/core/parser.js
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@ -897,21 +897,15 @@ class Lexer {
ch = this.nextChar();
}
if (ch < /* '0' = */ 0x30 || ch > /* '9' = */ 0x39) {
const msg = `Invalid number: ${String.fromCharCode(ch)} (charCode ${ch})`;
if (isWhiteSpace(ch) || ch === /* EOF = */ -1) {
// This is consistent with Adobe Reader (fixes issue9252.pdf).
if (divideBy === 10 && sign === 0) {
warn("Lexer.getNumber - treating a single decimal point as zero.");
return 0;
}
// This is consistent with Adobe Reader (fixes bug1753983.pdf).
if (divideBy === 0 && sign === -1) {
warn("Lexer.getNumber - treating a single minus sign as zero.");
return 0;
}
// This is consistent with Adobe Reader (fixes issue9252.pdf,
// issue15604.pdf, bug1753983.pdf).
info(`Lexer.getNumber - "${msg}".`);
return 0;
}
throw new FormatError(
`Invalid number: ${String.fromCharCode(ch)} (charCode ${ch})`
);
throw new FormatError(msg);
}
sign = sign || 1;

1
test/pdfs/issue15604.pdf.link Normal file
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@ -0,0 +1 @@
https://github.com/mozilla/pdf.js/files/9832017/SP_Page1.pdf

7
test/test_manifest.json
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@ -288,6 +288,13 @@
"link": true,
"type": "eq"
},
{ "id": "issue15604",
"file": "pdfs/issue15604.pdf",
"md5": "505040e5634434ae97118a4c39bf27e5",
"rounds": 1,
"link": true,
"type": "eq"
},
{ "id": "bug921760",
"file": "pdfs/bug921760.pdf",
"md5": "1aa136d786a65b0d7cce7bdb3c58c6c3",

18
test/unit/parser_spec.js
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@ -151,17 +151,17 @@ describe("parser", function () {
expect(plusLexer.getNumber()).toEqual(205.88);
});
it("should treat a single decimal point, or minus sign, as zero", function () {
const dotInput = new StringStream(".");
const dotLexer = new Lexer(dotInput);
expect(dotLexer.getNumber()).toEqual(0);
it("should treat a single decimal point, or minus/plus sign, as zero", function () {
const validNums = [".", "-", "+", "-.", "+.", "-\r\n.", "+\r\n."];
for (const number of validNums) {
const validInput = new StringStream(number);
const validLexer = new Lexer(validInput);
const minusInput = new StringStream("-");
const minusLexer = new Lexer(minusInput);
expect(minusLexer.getNumber()).toEqual(0);
expect(validLexer.getNumber()).toEqual(0);
}
const numbers = ["..", "-.", "+.", "-\r\n.", "+\r\n."];
for (const number of numbers) {
const invalidNums = ["..", ".-", ".+"];
for (const number of invalidNums) {
const invalidInput = new StringStream(number);
const invalidLexer = new Lexer(invalidInput);