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-
+
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-
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-
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-
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+
|
#ifndef OF_INFLATE64_STREAM_M
# import "OFInflateStream.h"
#else
# import "OFInflate64Stream.h"
# define OFInflateStream OFInflate64Stream
#endif
#import "huffman_tree.h"
#import "OFHuffmanTree.h"
#import "OFInitializationFailedException.h"
#import "OFInvalidFormatException.h"
#import "OFNotOpenException.h"
#import "OFOutOfMemoryException.h"
#ifndef OF_INFLATE64_STREAM_M
# define BUFFER_SIZE OF_INFLATE_STREAM_BUFFER_SIZE
# define bufferSize OFInflateStreamBufferSize
#else
# define BUFFER_SIZE OF_INFLATE64_STREAM_BUFFER_SIZE
# define bufferSize OFInflate64StreamBufferSize
#endif
enum state {
BLOCK_HEADER,
UNCOMPRESSED_BLOCK_HEADER,
UNCOMPRESSED_BLOCK,
HUFFMAN_TREE,
HUFFMAN_BLOCK
enum State {
stateBlockHeader,
stateUncompressedBlockHeader,
stateUncompressedBlock,
stateHuffmanTree,
stateHuffmanBlock
};
enum HuffmanState {
enum huffman_state {
huffmanStateWriteValue,
WRITE_VALUE,
AWAIT_CODE,
AWAIT_LENGTH_EXTRA_BITS,
AWAIT_DISTANCE,
AWAIT_DISTANCE_EXTRA_BITS,
PROCESS_PAIR
huffmanStateAwaitCode,
huffmanStateAwaitLengthExtraBits,
huffmanStateAwaitDistance,
huffmanStateAwaitDistanceExtraBits,
huffmanStateProcessPair
};
#ifndef OF_INFLATE64_STREAM_M
static const uint8_t numDistanceCodes = 30;
static const uint8_t lengthCodes[29] = {
/* indices are -257, values -3 */
0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56,
|
︙ | | |
96
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129
|
95
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100
101
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103
104
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108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
-
+
-
+
|
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10,
10, 11, 11, 12, 12, 13, 13, 14, 14
};
#endif
static const uint8_t codeLengthsOrder[19] = {
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
};
static struct of_huffman_tree *fixedLitLenTree, *fixedDistTree;
static OFHuffmanTree fixedLitLenTree, fixedDistTree;
@implementation OFInflateStream
static OF_INLINE bool
tryReadBits(OFInflateStream *stream, uint16_t *bits, uint8_t count)
{
uint16_t ret = stream->_savedBits;
assert(stream->_savedBitsLength < count);
for (uint_fast8_t i = stream->_savedBitsLength; i < count; i++) {
if OF_UNLIKELY (stream->_bitIndex == 8) {
if OF_LIKELY (stream->_bufferIndex <
stream->_bufferLength)
stream->_byte =
stream->_buffer[stream->_bufferIndex++];
else {
size_t length = [stream->_stream
readIntoBuffer: stream->_buffer
length: BUFFER_SIZE];
length: bufferSize];
if OF_UNLIKELY (length < 1) {
stream->_savedBits = ret;
stream->_savedBitsLength = i;
return false;
}
|
︙ | | |
157
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156
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161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
-
+
-
+
|
for (uint16_t i = 144; i <= 255; i++)
lengths[i] = 9;
for (uint16_t i = 256; i <= 279; i++)
lengths[i] = 7;
for (uint16_t i = 280; i <= 287; i++)
lengths[i] = 8;
fixedLitLenTree = of_huffman_tree_construct(lengths, 288);
fixedLitLenTree = OFHuffmanTreeNew(lengths, 288);
for (uint16_t i = 0; i <= 31; i++)
lengths[i] = 5;
fixedDistTree = of_huffman_tree_construct(lengths, 32);
fixedDistTree = OFHuffmanTreeNew(lengths, 32);
}
+ (instancetype)streamWithStream: (OFStream *)stream
{
return [[[self alloc] initWithStream: stream] autorelease];
}
|
︙ | | |
190
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|
189
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|
-
+
-
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-
-
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+
-
-
+
-
+
-
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-
+
|
_bitIndex = 8;
#ifdef OF_INFLATE64_STREAM_M
_slidingWindowMask = 0xFFFF;
#else
_slidingWindowMask = 0x7FFF;
#endif
_slidingWindow = of_alloc_zeroed(_slidingWindowMask + 1, 1);
_slidingWindow = OFAllocZeroedMemory(_slidingWindowMask + 1, 1);
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
if (_stream != nil)
[self close];
free(_slidingWindow);
OFFreeMemory(_slidingWindow);
if (_state == HUFFMAN_TREE) {
free(_context.huffmanTree.lengths);
if (_state == stateHuffmanTree) {
OFFreeMemory(_context.huffmanTree.lengths);
if (_context.huffmanTree.codeLenTree != NULL)
of_huffman_tree_release(
_context.huffmanTree.codeLenTree);
OFHuffmanTreeFree(_context.huffmanTree.codeLenTree);
}
if (_state == HUFFMAN_TREE || _state == HUFFMAN_BLOCK) {
if (_state == stateHuffmanTree || _state == stateHuffmanBlock) {
if (_context.huffman.litLenTree != fixedLitLenTree)
of_huffman_tree_release(_context.huffman.litLenTree);
OFHuffmanTreeFree(_context.huffman.litLenTree);
if (_context.huffman.distTree != fixedDistTree)
of_huffman_tree_release(_context.huffman.distTree);
OFHuffmanTreeFree(_context.huffman.distTree);
}
[super dealloc];
}
- (size_t)lowlevelReadIntoBuffer: (void *)buffer_
length: (size_t)length
|
︙ | | |
240
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|
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|
-
-
+
+
-
+
-
-
+
+
-
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-
+
-
+
-
+
|
if (_stream == nil)
@throw [OFNotOpenException exceptionWithObject: self];
if (_atEndOfStream)
return 0;
start:
switch ((enum state)_state) {
case BLOCK_HEADER:
switch ((enum State)_state) {
case stateBlockHeader:
if OF_UNLIKELY (_inLastBlock) {
[_stream unreadFromBuffer: _buffer + _bufferIndex
length: _bufferLength -
_bufferIndex];
_bufferIndex = _bufferLength = 0;
_atEndOfStream = true;
return bytesWritten;
}
if OF_UNLIKELY (!tryReadBits(self, &bits, 3))
return bytesWritten;
_inLastBlock = (bits & 1);
switch (bits >> 1) {
case 0: /* No compression */
_state = UNCOMPRESSED_BLOCK_HEADER;
_state = stateUncompressedBlockHeader;
_bitIndex = 8;
_context.uncompressedHeader.position = 0;
memset(_context.uncompressedHeader.length, 0, 4);
break;
case 1: /* Fixed Huffman */
_state = HUFFMAN_BLOCK;
_context.huffman.state = AWAIT_CODE;
_state = stateHuffmanBlock;
_context.huffman.state = huffmanStateAwaitCode;
_context.huffman.litLenTree = fixedLitLenTree;
_context.huffman.distTree = fixedDistTree;
_context.huffman.treeIter = fixedLitLenTree;
break;
case 2: /* Dynamic Huffman */
_state = HUFFMAN_TREE;
_state = stateHuffmanTree;
_context.huffmanTree.lengths = NULL;
_context.huffmanTree.receivedCount = 0;
_context.huffmanTree.value = 0xFE;
_context.huffmanTree.litLenCodesCount = 0xFF;
_context.huffmanTree.distCodesCount = 0xFF;
_context.huffmanTree.codeLenCodesCount = 0xFF;
break;
default:
@throw [OFInvalidFormatException exception];
}
goto start;
case UNCOMPRESSED_BLOCK_HEADER:
case stateUncompressedBlockHeader:
#define CTX _context.uncompressedHeader
/* FIXME: This can be done more efficiently than unreading */
[_stream unreadFromBuffer: _buffer + _bufferIndex
length: _bufferLength - _bufferIndex];
_bufferIndex = _bufferLength = 0;
CTX.position += [_stream
readIntoBuffer: CTX.length + CTX.position
length: 4 - CTX.position];
if OF_UNLIKELY (CTX.position < 4)
return bytesWritten;
if OF_UNLIKELY ((CTX.length[0] | (CTX.length[1] << 8)) !=
(uint16_t)~(CTX.length[2] | (CTX.length[3] << 8)))
@throw [OFInvalidFormatException exception];
_state = UNCOMPRESSED_BLOCK;
_state = stateUncompressedBlock;
/*
* Do not reorder! _context.uncompressed.position and
* _context.uncompressedHeader.length overlap!
*/
_context.uncompressed.length =
CTX.length[0] | (CTX.length[1] << 8);
_context.uncompressed.position = 0;
goto start;
#undef CTX
case UNCOMPRESSED_BLOCK:
case stateUncompressedBlock:
#define CTX _context.uncompressed
if OF_UNLIKELY (length == 0)
return bytesWritten;
tmp = (length < (size_t)CTX.length - CTX.position
? (uint16_t)length : CTX.length - CTX.position);
|
︙ | | |
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
|
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
|
-
+
-
+
|
_slidingWindowIndex = slidingWindowIndex;
length -= tmp;
bytesWritten += tmp;
CTX.position += tmp;
if OF_UNLIKELY (CTX.position == CTX.length)
_state = BLOCK_HEADER;
_state = stateBlockHeader;
goto start;
#undef CTX
case HUFFMAN_TREE:
case stateHuffmanTree:
#define CTX _context.huffmanTree
if OF_LIKELY (CTX.value == 0xFE) {
if OF_LIKELY (CTX.litLenCodesCount == 0xFF) {
if OF_UNLIKELY (!tryReadBits(self, &bits, 5))
return bytesWritten;
if OF_UNLIKELY (bits > 29)
|
︙ | | |
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
|
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
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394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
|
-
+
-
-
+
-
+
-
+
-
+
|
if OF_UNLIKELY (!tryReadBits(self, &bits, 4))
return bytesWritten;
CTX.codeLenCodesCount = bits;
}
if OF_LIKELY (CTX.lengths == NULL)
CTX.lengths = of_alloc_zeroed(19, 1);
CTX.lengths = OFAllocZeroedMemory(19, 1);
for (uint16_t i = CTX.receivedCount;
i < CTX.codeLenCodesCount + 4; i++) {
if OF_UNLIKELY (!tryReadBits(self, &bits, 3)) {
CTX.receivedCount = i;
return bytesWritten;
}
CTX.lengths[codeLengthsOrder[i]] = bits;
}
CTX.codeLenTree = of_huffman_tree_construct(
CTX.lengths, 19);
CTX.codeLenTree = OFHuffmanTreeNew(CTX.lengths, 19);
CTX.treeIter = CTX.codeLenTree;
free(CTX.lengths);
OFFreeMemory(CTX.lengths);
CTX.lengths = NULL;
CTX.receivedCount = 0;
CTX.value = 0xFF;
}
if OF_LIKELY (CTX.lengths == NULL)
CTX.lengths = of_alloc(
CTX.lengths = OFAllocMemory(
CTX.litLenCodesCount + CTX.distCodesCount + 258, 1);
for (uint16_t i = CTX.receivedCount;
i < CTX.litLenCodesCount + CTX.distCodesCount + 258;) {
uint8_t j, count;
if OF_LIKELY (CTX.value == 0xFF) {
if OF_UNLIKELY (!of_huffman_tree_walk(self,
if OF_UNLIKELY (!OFHuffmanTreeWalk(self,
tryReadBits, &CTX.treeIter, &value)) {
CTX.receivedCount = i;
return bytesWritten;
}
CTX.treeIter = CTX.codeLenTree;
|
︙ | | |
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
|
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
|
-
+
-
+
-
+
-
+
-
-
+
+
-
+
-
+
-
+
-
+
+
-
+
-
-
+
+
+
-
+
-
+
-
-
+
+
+
-
+
-
+
|
for (j = 0; j < count; j++)
CTX.lengths[i++] = value;
CTX.value = 0xFF;
}
of_huffman_tree_release(CTX.codeLenTree);
OFHuffmanTreeFree(CTX.codeLenTree);
CTX.codeLenTree = NULL;
CTX.litLenTree = of_huffman_tree_construct(CTX.lengths,
CTX.litLenTree = OFHuffmanTreeNew(CTX.lengths,
CTX.litLenCodesCount + 257);
CTX.distTree = of_huffman_tree_construct(
CTX.distTree = OFHuffmanTreeNew(
CTX.lengths + CTX.litLenCodesCount + 257,
CTX.distCodesCount + 1);
free(CTX.lengths);
OFFreeMemory(CTX.lengths);
/*
* litLenTree and distTree are at the same location in
* _context.huffman and _context.huffmanTree, thus no need to
* set them.
*/
_state = HUFFMAN_BLOCK;
_context.huffman.state = AWAIT_CODE;
_state = stateHuffmanBlock;
_context.huffman.state = huffmanStateAwaitCode;
_context.huffman.treeIter = CTX.litLenTree;
goto start;
#undef CTX
case HUFFMAN_BLOCK:
case stateHuffmanBlock:
#define CTX _context.huffman
for (;;) {
uint8_t extraBits, lengthCodeIndex;
if OF_UNLIKELY (CTX.state == WRITE_VALUE) {
if OF_UNLIKELY (CTX.state == huffmanStateWriteValue) {
if OF_UNLIKELY (length == 0)
return bytesWritten;
buffer[bytesWritten++] = CTX.value;
length--;
_slidingWindow[_slidingWindowIndex] = CTX.value;
_slidingWindowIndex =
(_slidingWindowIndex + 1) &
_slidingWindowMask;
CTX.state = AWAIT_CODE;
CTX.state = huffmanStateAwaitCode;
CTX.treeIter = CTX.litLenTree;
}
if OF_UNLIKELY (CTX.state == AWAIT_LENGTH_EXTRA_BITS) {
if OF_UNLIKELY (CTX.state ==
huffmanStateAwaitLengthExtraBits) {
if OF_UNLIKELY (!tryReadBits(self, &bits,
CTX.extraBits))
return bytesWritten;
CTX.length += bits;
CTX.state = AWAIT_DISTANCE;
CTX.state = huffmanStateAwaitDistance;
CTX.treeIter = CTX.distTree;
}
/* Distance of length distance pair */
if (CTX.state == AWAIT_DISTANCE) {
if OF_UNLIKELY (!of_huffman_tree_walk(self,
if (CTX.state == huffmanStateAwaitDistance) {
if OF_UNLIKELY (!OFHuffmanTreeWalk(self,
tryReadBits, &CTX.treeIter, &value))
return bytesWritten;
if OF_UNLIKELY (value >= numDistanceCodes)
@throw [OFInvalidFormatException
exception];
CTX.distance = distanceCodes[value];
extraBits = distanceExtraBits[value];
if (extraBits > 0) {
if OF_UNLIKELY (!tryReadBits(self,
&bits, extraBits)) {
#define HSADEB huffmanStateAwaitDistanceExtraBits
CTX.state =
CTX.state = HSADEB;
AWAIT_DISTANCE_EXTRA_BITS;
#undef HSADEB
CTX.extraBits = extraBits;
return bytesWritten;
}
CTX.distance += bits;
}
CTX.state = PROCESS_PAIR;
} else if (CTX.state == AWAIT_DISTANCE_EXTRA_BITS) {
CTX.state = huffmanStateProcessPair;
} else if (CTX.state ==
huffmanStateAwaitDistanceExtraBits) {
if OF_UNLIKELY (!tryReadBits(self, &bits,
CTX.extraBits))
return bytesWritten;
CTX.distance += bits;
CTX.state = PROCESS_PAIR;
CTX.state = huffmanStateProcessPair;
}
/* Length distance pair */
if (CTX.state == PROCESS_PAIR) {
if (CTX.state == huffmanStateProcessPair) {
for (uint_fast16_t j = 0; j < CTX.length; j++) {
uint16_t idx;
if OF_UNLIKELY (length == 0) {
CTX.length -= j;
return bytesWritten;
}
|
︙ | | |
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
|
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
|
-
+
-
+
-
+
-
+
-
+
-
+
|
_slidingWindow[_slidingWindowIndex] =
value;
_slidingWindowIndex =
(_slidingWindowIndex + 1) &
_slidingWindowMask;
}
CTX.state = AWAIT_CODE;
CTX.state = huffmanStateAwaitCode;
CTX.treeIter = CTX.litLenTree;
}
if OF_UNLIKELY (!of_huffman_tree_walk(self, tryReadBits,
if OF_UNLIKELY (!OFHuffmanTreeWalk(self, tryReadBits,
&CTX.treeIter, &value))
return bytesWritten;
/* End of block */
if OF_UNLIKELY (value == 256) {
if (CTX.litLenTree != fixedLitLenTree)
of_huffman_tree_release(CTX.litLenTree);
OFHuffmanTreeFree(CTX.litLenTree);
if (CTX.distTree != fixedDistTree)
of_huffman_tree_release(CTX.distTree);
OFHuffmanTreeFree(CTX.distTree);
_state = BLOCK_HEADER;
_state = stateBlockHeader;
goto start;
}
/* Literal byte */
if OF_LIKELY (value < 256) {
if OF_UNLIKELY (length == 0) {
CTX.state = WRITE_VALUE;
CTX.state = huffmanStateWriteValue;
CTX.value = value;
return bytesWritten;
}
buffer[bytesWritten++] = value;
length--;
|
︙ | | |
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
|
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
|
-
+
+
-
+
|
CTX.length = lengthCodes[lengthCodeIndex] + 3;
extraBits = lengthExtraBits[lengthCodeIndex];
if (extraBits > 0) {
if OF_UNLIKELY (!tryReadBits(self, &bits,
extraBits)) {
CTX.extraBits = extraBits;
CTX.state = AWAIT_LENGTH_EXTRA_BITS;
CTX.state =
huffmanStateAwaitLengthExtraBits;
return bytesWritten;
}
CTX.length += bits;
}
CTX.treeIter = CTX.distTree;
CTX.state = AWAIT_DISTANCE;
CTX.state = huffmanStateAwaitDistance;
}
break;
#undef CTX
}
OF_UNREACHABLE
|
︙ | | |