lzo.c File Reference

#include <string.h>
#include "avutil.h"
#include "common.h"
#include "intreadwrite.h"
#include "lzo.h"

Include dependency graph for lzo.c:

Go to the source code of this file.

Data Structures
struct	LZOContext

Macros
#define	OUTBUF_PADDED   1
	Define if we may write up to 12 bytes beyond the output buffer. More...
#define	INBUF_PADDED   1
	Define if we may read up to 8 bytes beyond the input buffer. More...
#define	GETB(c)   (*(c).in++)

Typedefs
typedef struct LZOContext	LZOContext

Functions
static int	get_byte (LZOContext *c)
	Reads one byte from the input buffer, avoiding an overrun. More...
static int	get_len (LZOContext *c, int x, int mask)
	Decodes a length value in the coding used by lzo. More...
static void	copy (LZOContext *c, int cnt)
	Copies bytes from input to output buffer with checking. More...
static void	copy_backptr (LZOContext *c, int back, int cnt)
	Copies previously decoded bytes to current position. More...
int	av_lzo1x_decode (void *out, int *outlen, const void *in, int *inlen)
	Decodes LZO 1x compressed data. More...

Macro Definition Documentation

#define GETB

(

c

)

(*(c).in++)

Definition at line 53 of file lzo.c.

Referenced by av_lzo1x_decode().

#define INBUF_PADDED   1

Define if we may read up to 8 bytes beyond the input buffer.

Definition at line 32 of file lzo.c.

#define OUTBUF_PADDED   1

Define if we may write up to 12 bytes beyond the output buffer.

Definition at line 30 of file lzo.c.

Typedef Documentation

typedef struct LZOContext LZOContext

Function Documentation

static void copy ( LZOContext *  c, int  cnt  )

inlinestatic

Copies bytes from input to output buffer with checking.

Parameters

cnt	number of bytes to copy, must be >= 0

Definition at line 79 of file lzo.c.

Referenced by av_buffersrc_add_frame_flags(), av_buffersrc_add_frame_internal(), av_lzo1x_decode(), avfilter_init_str(), avfilter_register_all(), avformat_queue_attached_pictures(), decode_tdlt(), frame_thread_init(), intlist_read(), intra_predict(), qpeg_decode_intra(), read_thread(), roq_decode_frame(), and rtmp_write().

static void copy_backptr ( LZOContext *  c, int  back, int  cnt  )

inlinestatic

Copies previously decoded bytes to current position.

Parameters

back	how many bytes back we start, must be > 0
cnt	number of bytes to copy, must be >= 0

cnt > back is valid, this will copy the bytes we just copied, thus creating a repeating pattern with a period length of back.

Definition at line 111 of file lzo.c.

Referenced by av_lzo1x_decode().

static int get_byte ( LZOContext *  c )

inlinestatic

Reads one byte from the input buffer, avoiding an overrun.

Returns

byte read

Definition at line 44 of file lzo.c.

Referenced by get_len().

static int get_len ( LZOContext *  c, int  x, int  mask  )

inlinestatic

Decodes a length value in the coding used by lzo.

Parameters

x	previous byte value
mask	bits used from x

Returns

decoded length value

Definition at line 64 of file lzo.c.

Referenced by av_lzo1x_decode().