libavutil/lzo.c File Reference

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

Go to the source code of this file.

Data Structures

struct LZOContext

Defines

#define OUTBUF_PADDED 1

Avoid e.g. MPlayers fast_memcpy, it slows things down here.

#define INBUF_PADDED 1

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

#define GETB(c) (*(c).in++)

#define BUILTIN_MEMCPY

#define COPY2(d, s) memcpy(d, s, 2);

#define COPY4(d, s) memcpy(d, s, 4);

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 memcpy_backptr (uint8_t *dst, int back, int cnt)

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

Copies previously decoded bytes to current position.

void av_memcpy_backptr (uint8_t *dst, int back, int cnt)

deliberately overlapping memcpy implementation

int av_lzo1x_decode (void *out, int *outlen, const void *in, int *inlen)

Decodes LZO 1x compressed data.

Define Documentation

#define BUILTIN_MEMCPY

Definition at line 72 of file lzo.c.

#define COPY2 ( d,

s ) memcpy(d, s, 2);

Definition at line 77 of file lzo.c.

Referenced by memcpy_backptr().

#define COPY4 ( d,

s ) memcpy(d, s, 4);

Definition at line 78 of file lzo.c.

Referenced by copy().

#define GETB ( c ) (*(c).in++)

Definition at line 51 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

Avoid e.g. MPlayers fast_memcpy, it slows things down here.

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

Definition at line 30 of file lzo.c.

Function Documentation

static void copy ( LZOContext * c,

int cnt

) [inline, static]

Copies bytes from input to output buffer with checking.

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

Definition at line 88 of file lzo.c.

Referenced by av_lzo1x_decode(), avfilter_register_all(), frame_thread_init(), intra_predict(), qpeg_decode_intra(), resample(), roq_decode_frame(), rtmp_write(), and swr_convert().

static void copy_backptr ( LZOContext * c,

int back,

int cnt

) [inline, static]

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 121 of file lzo.c.

Referenced by av_lzo1x_decode().

static int get_byte ( LZOContext * c ) [inline, static]

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

Returns:: byte read

Definition at line 43 of file lzo.c.

static int get_len ( LZOContext * c,

int x,

int mask

) [inline, static]

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 62 of file lzo.c.

Referenced by av_lzo1x_decode().

static void memcpy_backptr ( uint8_t * dst,

int back,

int cnt

) [inline, static]

Definition at line 136 of file lzo.c.

Referenced by av_memcpy_backptr(), and copy_backptr().

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