lzw.c File Reference

LZW decoding routines. More...

#include "avcodec.h"
#include "bytestream.h"
#include "lzw.h"
#include "libavutil/mem.h"

Classes
struct	LZWState

Macros
#define	LZW_MAXBITS   12
#define	LZW_SIZTABLE   (1<<LZW_MAXBITS)

Functions
int	ff_lzw_decode_tail (LZWState *p)
av_cold void	ff_lzw_decode_open (LZWState **p)
av_cold void	ff_lzw_decode_close (LZWState **p)
int	ff_lzw_decode_init (LZWState *p, int csize, const uint8_t *buf, int buf_size, int mode)
	Initialize LZW decoder. More...
int	ff_lzw_decode (LZWState *p, uint8_t *buf, int len)
	Decode given number of bytes NOTE: the algorithm here is inspired from the LZW GIF decoder written by Steven A. More...

Detailed Description

LZW decoding routines.

Author

Fabrice Bellard

modified for use in TIFF by Konstantin Shishkov

Function Documentation

ff_lzw_decode()

int ff_lzw_decode	(	LZWState *	p,
		uint8_t *	buf,
		int	len
	)

Decode given number of bytes NOTE: the algorithm here is inspired from the LZW GIF decoder written by Steven A.

Bennett in 1987.

Parameters

p	LZW context
buf	output buffer
len	number of bytes to decode

Returns

number of bytes decoded

ff_lzw_decode_init()

int ff_lzw_decode_init	(	LZWState *	p,
		int	csize,
		const uint8_t *	buf,
		int	buf_size,
		int	mode
	)

Initialize LZW decoder.

Parameters

p	LZW context
csize	initial code size in bits
buf	input data
buf_size	input data size
mode	decoder working mode - either GIF or TIFF