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James Richie
2026-08-30 22:02:02 +00:00
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vendor/tecnickcom/tc-lib-pdf-parser/test/XrefTest.php
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<?php
/**
* XrefTest.php
*
* @since 2011-05-23
* @category Library
* @package Pdfparser
* @author Nicola Asuni <info@tecnick.com>
* @copyright 2011-2026 Nicola Asuni - Tecnick.com LTD
* @license https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
* @link https://github.com/tecnickcom/tc-lib-pdf-parser
*
* This file is part of tc-lib-pdf-parser software library.
*/
namespace Test;
use Com\Tecnick\Pdf\Parser\Exception as PPException;
class XrefTest extends TestCase
{
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testProcessObjIndexesHandlesInUseAndCompressedObjects(): void
{
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
$obj_num = 3;
$sdata = [
[1, 42, 0],
[2, 7, 4],
[0, 0, 0],
];
$parser = new XrefStreamHarness();
$parser->processObjIndexesPublic($xref, $obj_num, $sdata);
$this->assertSame(6, $obj_num);
$this->assertSame(42, $xref['xref']['3_0'] ?? null);
$this->assertSame('7_0_4', $xref['xref']['4_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testPngUnpredictorDecodesAndRejectsUnknownPredictor(): void
{
$parser = new XrefStreamHarness();
$decoded = [];
$parser->pngUnpredictorPublic([[0, 10]], $decoded, 1, [0]);
if (!isset($decoded[0][0])) {
$this->fail('Decoded first row value is missing.');
}
$this->assertSame(10, $decoded[0][0]);
$decoded = [];
$parser->pngUnpredictorPublic([[1, 5]], $decoded, 1, [0]);
if (!isset($decoded[0][0])) {
$this->fail('Decoded first row value is missing.');
}
$this->assertSame(5, $decoded[0][0]);
$decoded = [];
$parser->pngUnpredictorPublic([[2, 3]], $decoded, 1, [4]);
if (!isset($decoded[0][0])) {
$this->fail('Decoded first row value is missing.');
}
$this->assertSame(7, $decoded[0][0]);
$decoded = [];
$parser->pngUnpredictorPublic([[4, 8]], $decoded, 1, [1]);
if (!isset($decoded[0][0])) {
$this->fail('Decoded first row value is missing.');
}
$this->assertSame(9, $decoded[0][0]);
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Unknown PNG predictor');
$decoded = [];
$parser->pngUnpredictorPublic([[9, 1]], $decoded, 1, [0]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefParsesEntriesAndTrailer(): void
{
$pdf =
"xref\r\n"
. "0 2\r\n"
. "0000000000 65535 f\r\n"
. "0000000017 00000 n\r\n"
. "trailer << /Size 2 /Root 1 0 R /Info 2 0 R /Encrypt 3 0 R /ID [<AA><BB>] >>\r\n";
$parser = new XrefHarness();
$parser->setPdfDataPublic($pdf);
$xref = $parser->decodeXrefPublic(0, ['xref' => []]);
$this->assertSame(17, $xref['xref']['1_0'] ?? null);
$this->assertSame(2, $xref['trailer']['size']);
$this->assertSame('1_0', $xref['trailer']['root']);
$this->assertSame('2_0', $xref['trailer']['info']);
$this->assertSame('3_0', $xref['trailer']['encrypt'] ?? null);
$this->assertSame(['AA', 'BB'], $xref['trailer']['id']);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefLeavesEncryptUnsetWhenMissing(): void
{
$pdf =
"xref\r\n"
. "0 1\r\n"
. "0000000017 00000 n\r\n"
. "trailer << /Size 1 /Root 1 0 R /Info 2 0 R /ID [<AA><BB>] >>\r\n";
$parser = new XrefHarness();
$parser->setPdfDataPublic($pdf);
$xref = $parser->decodeXrefPublic(0, ['xref' => []]);
$this->assertArrayNotHasKey('encrypt', $xref['trailer']);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamParsesRowsAndTrailer(): void
{
$stream_data = \pack('C*', 0, 1, 10, 0, 0, 2, 5, 1);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '1', 0], ['numeric', '1', 0]], 0],
['/', 'Index', 0],
['[', [['numeric', '0', 0], ['numeric', '2', 0]], 0],
['/', 'Size', 0],
['numeric', '2', 0],
['/', 'Root', 0],
['objref', '1_0', 0],
['/', 'ID', 0],
['[', [['hex', 'AA', 0], ['hex', 'BB', 0]], 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '3', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->decodeXrefStreamPublic(100, ['xref' => []]);
$this->assertSame(10, $xref['xref']['0_0'] ?? null);
$this->assertSame('5_0_1', $xref['xref']['1_0'] ?? null);
$this->assertSame('1_0', $xref['trailer']['root']);
$this->assertSame(2, $xref['trailer']['size']);
$this->assertSame(['AA', 'BB'], $xref['trailer']['id']);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamMapsMultiRangeIndexSections(): void
{
$stream_data = \pack(
'C*',
0,
1,
0,
0,
30,
0,
1,
0,
0,
31,
0,
1,
0,
0,
32,
0,
1,
0,
0,
33,
0,
1,
0,
0,
34,
0,
1,
0,
0,
35,
0,
1,
0,
0,
36,
);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '3', 0], ['numeric', '0', 0]], 0],
['/', 'Index', 0],
[
'[',
[
['numeric', '3', 0],
['numeric', '1', 0],
['numeric', '15', 0],
['numeric', '1', 0],
['numeric', '17', 0],
['numeric', '2', 0],
['numeric', '41', 0],
['numeric', '3', 0],
],
0,
],
['/', 'Size', 0],
['numeric', '44', 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '4', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->decodeXrefStreamPublic(100, ['xref' => []]);
$this->assertSame(30, $xref['xref']['3_0'] ?? null);
$this->assertSame(31, $xref['xref']['15_0'] ?? null);
$this->assertSame(32, $xref['xref']['17_0'] ?? null);
$this->assertSame(33, $xref['xref']['18_0'] ?? null);
$this->assertSame(34, $xref['xref']['41_0'] ?? null);
$this->assertSame(35, $xref['xref']['42_0'] ?? null);
$this->assertSame(36, $xref['xref']['43_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamFallsBackToSizeWhenIndexIsMissing(): void
{
$stream_data = \pack('C*', 0, 1, 0, 0, 20, 0, 1, 0, 0, 21);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '3', 0], ['numeric', '0', 0]], 0],
['/', 'Size', 0],
['numeric', '2', 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '4', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->decodeXrefStreamPublic(100, ['xref' => []]);
$this->assertSame(20, $xref['xref']['0_0'] ?? null);
$this->assertSame(21, $xref['xref']['1_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamRejectsOddIndexArrayLength(): void
{
$stream_data = \pack('C*', 0, 1, 0, 0, 20);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '3', 0], ['numeric', '0', 0]], 0],
['/', 'Index', 0],
['[', [['numeric', '3', 0], ['numeric', '1', 0], ['numeric', '15', 0]], 0],
['/', 'Size', 0],
['numeric', '16', 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '4', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Invalid xref stream Index array: expected even number of values');
$parser->decodeXrefStreamPublic(100, ['xref' => []]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamRejectsRowCountMismatchAgainstIndexCoverage(): void
{
$stream_data = \pack('C*', 0, 1, 0, 0, 20, 0, 1, 0, 0, 21);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '3', 0], ['numeric', '0', 0]], 0],
['/', 'Index', 0],
['[', [['numeric', '3', 0], ['numeric', '3', 0]], 0],
['/', 'Size', 0],
['numeric', '20', 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '4', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Invalid xref stream row count: expected 3 rows from Index, got 2');
$parser->decodeXrefStreamPublic(100, ['xref' => []]);
}
public function testProcessDdataUsesDefaultTypeWhenFirstFieldWidthIsZero(): void
{
$parser = new XrefHarness();
$sdata = [];
$parser->processDdataPublic($sdata, [[9, 3]], [0, 1, 1]);
$this->assertSame([1, 9, 3], $sdata[0] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testGetXrefDataThrowsWhenStartxrefIsMissing(): void
{
$parser = new XrefHarness();
$parser->setPdfDataPublic("%PDF-1.7\nNo xref markers here");
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Unable to find startxref (1)');
$parser->getXrefDataPublic();
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testProcessObjIndexesIgnoresUnknownEntryTypes(): void
{
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
$obj_num = 9;
$parser = new XrefStreamHarness();
$parser->processObjIndexesPublic($xref, $obj_num, [[9, 1, 2]]);
$this->assertSame(10, $obj_num);
$this->assertSame([], $xref['xref']);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testPngUnpredictorCoversAveragePredictor(): void
{
$parser = new XrefStreamHarness();
$decoded = [];
$parser->pngUnpredictorPublic([[3, 4]], $decoded, 1, [2]);
if (!isset($decoded[0][0])) {
$this->fail('Decoded first row value is missing.');
}
$this->assertSame(5, $decoded[0][0]);
}
public function testMinDistanceCoversAllOutcomeBranches(): void
{
$parser = new XrefStreamHarness();
$ddata = [[0]];
$parser->minDistancePublic($ddata, 0, 5, 0, [7, 2, 0]);
$this->assertSame(12, $ddata[0][0] ?? null);
$parser->minDistancePublic($ddata, 0, 5, 0, [10, 3, 9]);
$this->assertSame(8, $ddata[0][0] ?? null);
$parser->minDistancePublic($ddata, 0, 5, 0, [0, 10, 4]);
$this->assertSame(9, $ddata[0][0] ?? null);
}
public function testProcessXrefPrevAndDecodeParmsHandleInvalidInput(): void
{
$parser = new XrefStreamHarness();
$prevxref = null;
$parser->processXrefPrevPublic(['name', 'x', 0], $prevxref);
$this->assertNull($prevxref);
$parser->processXrefPrevPublic(['numeric', '17', 0], $prevxref);
$this->assertSame(17, $prevxref);
$columns = 9;
$predictor = 3;
$parser->processXrefDecodeParmsPublic(['name', 'x', 0], $columns, $predictor);
$this->assertSame(9, $columns);
$this->assertSame(3, $predictor);
$parser->processXrefDecodeParmsPublic(
['<<', [['/', 'Columns', 0], ['numeric', '-5', 0], ['/', 'Predictor', 0], ['numeric', '12', 0]], 0],
$columns,
$predictor,
);
$this->assertSame(0, $columns);
$this->assertSame(12, $predictor);
}
public function testProcessXrefTypeFtAndObjrefCoverTrailerBranches(): void
{
$parser = new XrefStreamHarness();
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
$sarr = [
['/', 'Root', 0],
['objref', '1_0', 0],
['/', 'Info', 0],
['objref', '2_0', 0],
['/', 'Encrypt', 0],
['objref', '3_0', 0],
['/', 'Size', 0],
['numeric', '4', 0],
['/', 'ID', 0],
['[', [['hex', 'AA', 0], ['hex', 'BB', 0]], 0],
['/', 'ID', 0],
['[', [['hex', '', 0], ['hex', 'BB', 0]], 0],
];
$parser->processXrefTypeFtPublic('Root', $sarr, 0, $xref, true);
$parser->processXrefTypeFtPublic('Info', $sarr, 2, $xref, true);
$parser->processXrefTypeFtPublic('Encrypt', $sarr, 4, $xref, true);
$parser->processXrefTypeFtPublic('Size', $sarr, 6, $xref, true);
$parser->processXrefTypeFtPublic('ID', $sarr, 8, $xref, true);
$parser->processXrefTypeFtPublic('ID', $sarr, 10, $xref, true);
$this->assertSame('1_0', $xref['trailer']['root']);
$this->assertSame('2_0', $xref['trailer']['info']);
$this->assertSame('3_0', $xref['trailer']['encrypt'] ?? null);
$this->assertSame(4, $xref['trailer']['size']);
$this->assertSame(['AA', 'BB'], $xref['trailer']['id']);
$before = $xref;
$parser->processXrefTypeFtPublic('Size', $sarr, 6, $xref, false);
$this->assertSame($before, $xref);
$objref = $parser->processXrefObjrefPublic('Root', [['/', 'Root', 0], ['name', 'x', 0]], 0, $xref);
$this->assertSame($xref, $objref);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefThrowsWhenTrailerIsMissing(): void
{
$parser = new XrefHarness();
$parser->setPdfDataPublic("xref\r\n0 1\r\n0000000000 65535 f\r\n");
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Unable to find trailer');
$parser->decodeXrefPublic(0, ['xref' => []]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testGetXrefDataDetectsRepeatedOffsetLoop(): void
{
$parser = new XrefHarness();
$parser->setPdfDataPublic("%PDF-1.7\ninvalid\n");
try {
$parser->getXrefDataPublic(5, ['xref' => []]);
} catch (PPException $exception) {
$this->assertContains($exception->getMessage(), [
'Unable to find startxref (3)',
'Unable to find xref (4)',
]);
}
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('LOOP: this XRef offset has been already processed');
$parser->getXrefDataPublic(5, ['xref' => []]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testGetXrefDataFindsObjectStreamStartxrefFromOffset(): void
{
$stream_data = \pack('C*', 0, 1, 9, 0);
$parser = new XrefHarness();
$parser->setPdfDataPublic('AAAAA12 0 obj .... xref');
$parser->setStubRawObject(['objref', '12_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '1', 0], ['numeric', '1', 0]], 0],
['/', 'Index', 0],
['[', [['numeric', '0', 0], ['numeric', '1', 0]], 0],
['/', 'Size', 0],
['numeric', '1', 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '3', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->getXrefDataPublic(5, ['xref' => []]);
$this->assertSame(9, $xref['xref']['0_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testGetXrefDataFindsStartxrefMarkerWhenOffsetIsNonZero(): void
{
$body = 'xxxxxxxxxxxxxxxxxxxx';
$pdf =
$body
. "xref\r\n"
. "0 1\r\n"
. "0000000001 00000 n\r\n"
. "trailer << /Size 1 >>\r\n"
. "startxref\n20\n%%EOF";
$parser = new XrefHarness();
$parser->setPdfDataPublic($pdf);
$start = (int) \strpos($pdf, 'startxref');
$xref = $parser->getXrefDataPublic($start - 1, ['xref' => []]);
$this->assertSame(1, $xref['xref']['0_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testGetXrefDataThrowsStartxref3ForNonZeroOffsetWithoutMarkers(): void
{
$parser = new XrefHarness();
$parser->setPdfDataPublic('%PDF-1.7\nbody without xref hints');
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Unable to find startxref (3)');
$parser->getXrefDataPublic(5, ['xref' => []]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefCallsGetXrefDataWhenTrailerContainsPrev(): void
{
$parser = new class() extends XrefHarness {
public int $capturedOffset = -1;
protected function getXrefData(int $offset = 0, array $xref = []): array
{
$this->capturedOffset = $offset;
$xref['xref']['prev_0'] = $offset;
return [
'trailer' => $xref['trailer'] ?? ['id' => [], 'info' => '', 'root' => '', 'size' => 0],
'xref' => $xref['xref'],
];
}
};
$parser->setPdfDataPublic("xref\r\n0 1\r\n0000000001 00000 n\r\ntrailer << /Size 1 /Prev 11 >>\r\n");
$xref = $parser->decodeXrefPublic(0, ['xref' => []]);
$this->assertSame(11, $parser->capturedOffset);
$this->assertSame(11, $xref['xref']['prev_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamThrowsWhenRawObjectValueIsNotString(): void
{
$parser = new XrefHarness();
$parser->setStubRawObject(['numeric', [], 0]);
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Unable to find xref stream');
$parser->decodeXrefStreamPublic(0, ['xref' => []]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamHandlesNonArrayDictionaryPayload(): void
{
$stream_data = \pack('C*', 0, 1, 9, 0);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '1_0', 0]);
$parser->setStubIndirectObject([
['<<', 'not-array', 0],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->decodeXrefStreamPublic(0, ['xref' => ['9_0' => 99]]);
$this->assertSame(99, $xref['xref']['9_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamCallsGetXrefDataWhenPrevIsPresent(): void
{
$stream_data = \pack('C*', 0, 1, 9, 0);
$parser = new class() extends XrefHarness {
public int $capturedOffset = -1;
protected function getXrefData(int $offset = 0, array $xref = []): array
{
$this->capturedOffset = $offset;
$xref['xref']['prev_0'] = $offset;
return [
'trailer' => $xref['trailer'] ?? ['id' => [], 'info' => '', 'root' => '', 'size' => 0],
'xref' => $xref['xref'],
];
}
};
$parser->setStubRawObject(['objref', '1_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '1', 0], ['numeric', '1', 0]], 0],
['/', 'Index', 0],
['[', [['numeric', '0', 0], ['numeric', '1', 0]], 0],
['/', 'Size', 0],
['numeric', '1', 0],
['/', 'Prev', 0],
['numeric', '77', 0],
['/', 'DecodeParms', 0],
['<<', [['/', 'Columns', 0], ['numeric', '3', 0], ['/', 'Predictor', 0], ['numeric', '10', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->decodeXrefStreamPublic(0, ['xref' => []]);
$this->assertSame(77, $parser->capturedOffset);
$this->assertSame(77, $xref['xref']['prev_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testProcessObjIndexesMapRejectsSparseRowLookup(): void
{
$parser = new XrefStreamHarness();
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Invalid xref stream row at index 2');
$parser->processObjIndexesMapPublic($xref, [2 => 10], [[1, 20, 0]]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testProcessSingleObjIndexRejectsMissingMandatoryFields(): void
{
$parser = new XrefStreamHarness();
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
try {
$parser->processSingleObjIndexPublic($xref, 8, [1]);
$this->fail('Expected missing offset exception for in-use entry.');
} catch (PPException $exception) {
$this->assertSame(
'Invalid xref stream entry for object 8: missing offset for in-use entry',
$exception->getMessage(),
);
}
$this->expectException(PPException::class);
$this->expectExceptionMessageContains(
'Invalid xref stream entry for object 9: missing object stream reference for compressed entry',
);
$parser->processSingleObjIndexPublic($xref, 9, [2, 55]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testParseXrefIndexSectionsCoversNullAndValidationErrors(): void
{
$parser = new XrefStreamHarness();
$this->assertNull($parser->parseXrefIndexSectionsPublic(null));
$this->assertNull($parser->parseXrefIndexSectionsPublic(['[', 'oops', 0]));
try {
$parser->parseXrefIndexSectionsPublic(['[', [['name', 'x', 0], ['numeric', '1', 0]], 0]);
$this->fail('Expected invalid numeric token exception.');
} catch (PPException $exception) {
$this->assertSame('Invalid xref stream Index array: expected numeric values', $exception->getMessage());
}
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Invalid xref stream Index array: values must be non-negative');
$parser->parseXrefIndexSectionsPublic(['[', [['numeric', '-1', 0], ['numeric', '1', 0]], 0]);
}
public function testBuildXrefObjectNumbersExpandsSections(): void
{
$parser = new XrefStreamHarness();
$this->assertSame([3, 4, 5, 10], $parser->buildXrefObjectNumbersPublic([[3, 3], [10, 1]]));
$this->assertSame([], $parser->buildXrefObjectNumbersPublic([]));
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamThrowsWhenIndexAndSizeAreMissing(): void
{
$stream_data = \pack('C*', 1, 9, 0);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '1', 0], ['numeric', '1', 0]], 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Unable to determine xref stream Index coverage: missing Index and Size');
$parser->decodeXrefStreamPublic(100, ['xref' => []]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefStreamWithoutPredictorUsesRawRows(): void
{
$stream_data = \pack('C*', 1, 9, 0);
$parser = new XrefHarness();
$parser->setStubRawObject(['objref', '5_0', 0]);
$parser->setStubIndirectObject([
[
'<<',
[
['/', 'Type', 0],
['/', 'XRef', 0],
['/', 'W', 0],
['[', [['numeric', '1', 0], ['numeric', '1', 0], ['numeric', '1', 0]], 0],
['/', 'Index', 0],
['[', [['numeric', '0', 0], ['numeric', '1', 0]], 0],
['/', 'Size', 0],
['numeric', '1', 0],
],
0,
],
['stream', $stream_data, 0, [$stream_data, []]],
]);
$xref = $parser->decodeXrefStreamPublic(100, ['xref' => []]);
$this->assertSame(9, $xref['xref']['0_0'] ?? null);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testDecodeXrefBreaksWhenEntryPatternStartsAtDifferentOffset(): void
{
$pdf = "xref\r\nabc\r\n0 1 n\r\ntrailer << /Size 1 >>\r\n";
$parser = new XrefHarness();
$parser->setPdfDataPublic($pdf);
$xref = $parser->decodeXrefPublic(0, ['xref' => ['9_0' => 99]]);
$this->assertSame(99, $xref['xref']['9_0'] ?? null);
$this->assertSame(1, $xref['trailer']['size']);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testParseXrefIndexSectionsRejectsNonArrayTokens(): void
{
$parser = new XrefStreamHarness();
$this->expectException(PPException::class);
$this->expectExceptionMessageContains('Invalid xref stream Index array: expected numeric values');
$parser->parseXrefIndexSectionsPublic(['[', [1 => ['numeric', '1', 0], 2 => ['numeric', '2', 0]], 0]);
}
/**
* @throws \Com\Tecnick\Pdf\Parser\Exception
*/
public function testProcessXrefTypeSkipsSlashTokenWithNonStringName(): void
{
$parser = new XrefStreamHarness();
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
$wbt = [0, 0, 0];
$state = [
'index_sections' => null,
'prevxref' => null,
'predictor' => 0,
'columns' => 0,
'size' => null,
'valid_crs' => false,
];
$parser->processXrefTypePublic(
[
['/', [['numeric', '1', 0]], 0],
['numeric', '7', 0],
],
$xref,
$wbt,
$state,
true,
);
$this->assertSame([], $xref['xref']);
$this->assertFalse($state['valid_crs']);
}
public function testProcessXrefObjrefReturnsWhenObjrefValueIsNotString(): void
{
$parser = new XrefStreamHarness();
$xref = [
'trailer' => [
'id' => [],
'info' => '',
'root' => '',
'size' => 0,
],
'xref' => [],
];
$result = $parser->processXrefObjrefPublic(
'Root',
[
['/', 'Root', 0],
['objref', [['numeric', '1', 0]], 0],
],
0,
$xref,
);
$this->assertSame($xref, $result);
}
}