Differences From Artifact [2f21e16d6f]:
- File
src/OFDeflateStream.h
— part of check-in
[d83d3aa719]
at
2013-10-10 13:18:35
on branch trunk
— Add OFDeflateStream.
No compression support yet, only decompression.
Decompression speed is acceptable for productive use, but there is still
a lot of room for optimization as this is a very straightforward
implementation without much optimization. (user: js, size: 2827) [annotate] [blame] [check-ins using]
To Artifact [ee0596ab39]:
- File src/OFDeflateStream.h — part of check-in [7aef43d648] at 2013-11-06 20:29:17 on branch trunk — Add OFDeflate64Stream. (user: js, size: 3037) [annotate] [blame] [check-ins using]
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15 16 17 18 19 20 21 | */ #import "OFStream.h" #define OF_DEFLATE_STREAM_BUFFER_SIZE 4096 /*! | | | | > > > > > > > | 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 |
*/
#import "OFStream.h"
#define OF_DEFLATE_STREAM_BUFFER_SIZE 4096
/*!
* @brief A class for a stream that handles Deflate compression or decompression
* transparently for an underlying stream.
*/
@interface OFDeflateStream: OFStream
{
#ifdef OF_DEFLATE_STREAM_M
@public
#endif
OFStream *_stream;
uint8_t _buffer[OF_DEFLATE_STREAM_BUFFER_SIZE];
uint_fast16_t _bufferIndex, _bufferLength;
uint8_t _byte;
uint_fast8_t _bitIndex, _savedBitsLength;
uint_fast16_t _savedBits;
@protected
uint8_t *_slidingWindow;
uint_fast16_t _slidingWindowIndex, _slidingWindowMask;
struct {
uint_fast8_t numDistanceCodes;
const uint8_t *lengthCodes;
const uint8_t *lengthExtraBits;
const uint16_t *distanceCodes;
const uint8_t *distanceExtraBits;
} _codes;
enum {
OF_DEFLATE_STREAM_BLOCK_HEADER,
OF_DEFLATE_STREAM_UNCOMPRESSED_BLOCK_HEADER,
OF_DEFLATE_STREAM_UNCOMPRESSED_BLOCK,
OF_DEFLATE_STREAM_HUFFMAN_TREE,
OF_DEFLATE_STREAM_HUFFMAN_BLOCK
} _state;
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