lzo.c File Reference

#include <limits.h>
#include <stdint.h>
#include <string.h>
#include "avassert.h"
#include "intreadwrite.h"
#include "lzo.h"
#include "macros.h"
#include "mem.h"

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.
#define	INBUF_PADDED   1
	Define if we may read up to 8 bytes beyond the input buffer.
#define	GETB(c)

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

Macro Definition Documentation

OUTBUF_PADDED

#define OUTBUF_PADDED   1

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

Definition at line 33 of file lzo.c.

INBUF_PADDED

#define INBUF_PADDED   1

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

Definition at line 35 of file lzo.c.

GETB

#define GETB

(

c

)

Value:

(*(c).in++)

Definition at line 56 of file lzo.c.

Referenced by av_lzo1x_decode().

Function Documentation

get_byte()

static int get_byte ( LZOContext * c )

inlinestatic

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

Returns

byte read

Definition at line 47 of file lzo.c.

Referenced by get_len().

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 67 of file lzo.c.

Referenced by av_lzo1x_decode().

copy()

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 87 of file lzo.c.

Referenced by av_lzo1x_decode().

copy_backptr()

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 120 of file lzo.c.

Referenced by av_lzo1x_decode().