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Let Lexer.getObj return a dummy-Cmd for commands that start with a non-visible ASCII character (issue 13999)

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This way we avoid breaking badly generated PDF documents where a non-visible ASCII character is "glued" to a valid command.
This commit is contained in:
Jonas Jenwald 2021-09-11 18:29:31 +02:00
parent 99e442941c
commit a47844d1fc
4 changed files with 46 additions and 2 deletions
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28
test/unit/parser_spec.js
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@ -13,9 +13,9 @@
* limitations under the License.
*/
import { Cmd, EOF, Name } from "../../src/core/primitives.js";
import { Lexer, Linearization, Parser } from "../../src/core/parser.js";
import { FormatError } from "../../src/shared/util.js";
import { Name } from "../../src/core/primitives.js";
import { StringStream } from "../../src/core/stream.js";
describe("parser", function () {
@ -217,6 +217,32 @@ describe("parser", function () {
}
});
});
describe("getObj", function () {
it(
"should stop immediately when the start of a command is " +
"a non-visible ASCII character (issue 13999)",
function () {
const input = new StringStream("\x14q\nQ");
const lexer = new Lexer(input);
let obj = lexer.getObj();
expect(obj instanceof Cmd).toEqual(true);
expect(obj.cmd).toEqual("\x14");
obj = lexer.getObj();
expect(obj instanceof Cmd).toEqual(true);
expect(obj.cmd).toEqual("q");
obj = lexer.getObj();
expect(obj instanceof Cmd).toEqual(true);
expect(obj.cmd).toEqual("Q");
obj = lexer.getObj();
expect(obj).toEqual(EOF);
}
);
});
});
describe("Linearization", function () {