lzw.h File Reference

LZW decoding routines. More...

#include <stdint.h>

Go to the source code of this file.

Typedefs
typedef void	LZWState

Enumerations
enum	FF_LZW_MODES { FF_LZW_GIF, FF_LZW_TIFF }

Functions
void	ff_lzw_decode_open (LZWState **p)
void	ff_lzw_decode_close (LZWState **p)
int	ff_lzw_decode_init (LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode)
	Initialize LZW decoder. More...
int	ff_lzw_decode (LZWState *s, 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...
int	ff_lzw_decode_tail (LZWState *lzw)
void	ff_lzw_encode_init (struct LZWEncodeState *s, uint8_t *outbuf, int outsize, int maxbits, enum FF_LZW_MODES mode, void(*lzw_put_bits)(struct PutBitContext *, int, unsigned int))
int	ff_lzw_encode (struct LZWEncodeState *s, const uint8_t *inbuf, int insize)
	LZW main compress function. More...
int	ff_lzw_encode_flush (struct LZWEncodeState *s, void(*lzw_flush_put_bits)(struct PutBitContext *))

Variables
const int	ff_lzw_encode_state_size

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

ff_lzw_encode()

int ff_lzw_encode	(	LZWEncodeState *	s,
		const uint8_t *	inbuf,
		int	insize
	)

LZW main compress function.

Parameters

s	LZW state
inbuf	Input buffer
insize	Size of input buffer

Returns

Number of bytes written or -1 on error