* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
+#include "avutil.h"
#include "common.h"
-//! avoid e.g. MPlayers fast_memcpy, it slows things down here
+//! Avoid e.g. MPlayers fast_memcpy, it slows things down here.
#undef memcpy
#include <string.h>
#include "lzo.h"
-//! define if we may write up to 12 bytes beyond the output buffer
+//! Define if we may write up to 12 bytes beyond the output buffer.
#define OUTBUF_PADDED 1
-//! define if we may read up to 8 bytes beyond the input buffer
+//! Define if we may read up to 8 bytes beyond the input buffer.
#define INBUF_PADDED 1
typedef struct LZOContext {
- uint8_t *in, *in_end;
+ const uint8_t *in, *in_end;
uint8_t *out_start, *out, *out_end;
int error;
} LZOContext;
/**
- * \brief read one byte from input buffer, avoiding overrun
+ * \brief Reads one byte from the input buffer, avoiding an overrun.
* \return byte read
*/
static inline int get_byte(LZOContext *c) {
if (c->in < c->in_end)
return *c->in++;
- c->error |= LZO_INPUT_DEPLETED;
+ c->error |= AV_LZO_INPUT_DEPLETED;
return 1;
}
#endif
/**
- * \brief decode a length value in the coding used by lzo
+ * \brief Decodes a length value in the coding used by lzo.
* \param x previous byte value
* \param mask bits used from x
* \return decoded length value
#endif
/**
- * \brief copy bytes from input to output buffer with checking
+ * \brief Copies bytes from input to output buffer with checking.
* \param cnt number of bytes to copy, must be >= 0
*/
static inline void copy(LZOContext *c, int cnt) {
- register uint8_t *src = c->in;
+ register const uint8_t *src = c->in;
register uint8_t *dst = c->out;
if (cnt > c->in_end - src) {
cnt = FFMAX(c->in_end - src, 0);
- c->error |= LZO_INPUT_DEPLETED;
+ c->error |= AV_LZO_INPUT_DEPLETED;
}
if (cnt > c->out_end - dst) {
cnt = FFMAX(c->out_end - dst, 0);
- c->error |= LZO_OUTPUT_FULL;
+ c->error |= AV_LZO_OUTPUT_FULL;
}
#if defined(INBUF_PADDED) && defined(OUTBUF_PADDED)
COPY4(dst, src);
c->out = dst + cnt;
}
+static inline void memcpy_backptr(uint8_t *dst, int back, int cnt);
+
/**
- * \brief copy previously decoded bytes to current position
+ * \brief Copies previously decoded bytes to current position.
* \param back how many bytes back we start
* \param cnt number of bytes to copy, must be >= 0
*
* thus creating a repeating pattern with a period length of back.
*/
static inline void copy_backptr(LZOContext *c, int back, int cnt) {
- register uint8_t *src = &c->out[-back];
+ register const uint8_t *src = &c->out[-back];
register uint8_t *dst = c->out;
if (src < c->out_start || src > dst) {
- c->error |= LZO_INVALID_BACKPTR;
+ c->error |= AV_LZO_INVALID_BACKPTR;
return;
}
if (cnt > c->out_end - dst) {
cnt = FFMAX(c->out_end - dst, 0);
- c->error |= LZO_OUTPUT_FULL;
+ c->error |= AV_LZO_OUTPUT_FULL;
}
+ memcpy_backptr(dst, back, cnt);
+ c->out = dst + cnt;
+}
+
+static inline void memcpy_backptr(uint8_t *dst, int back, int cnt) {
+ const uint8_t *src = &dst[-back];
if (back == 1) {
memset(dst, *src, cnt);
- dst += cnt;
} else {
#ifdef OUTBUF_PADDED
COPY2(dst, src);
}
memcpy(dst, src, cnt);
}
- dst += cnt;
}
- c->out = dst;
}
-/**
- * \brief decode LZO 1x compressed data
- * \param out output buffer
- * \param outlen size of output buffer, number of bytes left are returned here
- * \param in input buffer
- * \param inlen size of input buffer, number of bytes left are returned here
- * \return 0 on success, otherwise error flags, see lzo.h
- *
- * make sure all buffers are appropriately padded, in must provide
- * LZO_INPUT_PADDING, out must provide LZO_OUTPUT_PADDING additional bytes
- */
-int lzo1x_decode(void *out, int *outlen, void *in, int *inlen) {
+void av_memcpy_backptr(uint8_t *dst, int back, int cnt) {
+ memcpy_backptr(dst, back, cnt);
+}
+
+int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) {
int state= 0;
int x;
LZOContext c;
c.in = in;
- c.in_end = (uint8_t *)in + *inlen;
+ c.in_end = (const uint8_t *)in + *inlen;
c.out = c.out_start = out;
c.out_end = (uint8_t *)out + * outlen;
c.error = 0;
if (x > 17) {
copy(&c, x - 17);
x = GETB(c);
- if (x < 16) c.error |= LZO_ERROR;
+ if (x < 16) c.error |= AV_LZO_ERROR;
}
if (c.in > c.in_end)
- c.error |= LZO_INPUT_DEPLETED;
+ c.error |= AV_LZO_INPUT_DEPLETED;
while (!c.error) {
int cnt, back;
if (x > 15) {
back += (GETB(c) << 6) + (x >> 2);
if (back == (1 << 14)) {
if (cnt != 1)
- c.error |= LZO_ERROR;
+ c.error |= AV_LZO_ERROR;
break;
}
}
return c.error;
}
+#if LIBAVUTIL_VERSION_MAJOR < 50
+int lzo1x_decode(void *out, int *outlen, const void *in, int *inlen) {
+ return av_lzo1x_decode(out, outlen, in, inlen);
+}
+#endif
+
#ifdef TEST
#include <stdio.h>
#include <lzo/lzo1x.h>
#elif defined(LIBLZO_UNSAFE)
if (lzo1x_decompress(comp, inlen, decomp, &outlen, NULL))
#else
- if (lzo1x_decode(decomp, &outlen, comp, &inlen))
+ if (av_lzo1x_decode(decomp, &outlen, comp, &inlen))
#endif
av_log(NULL, AV_LOG_ERROR, "decompression error\n");
STOP_TIMER("lzod")
if (memcmp(orig, decomp, s))
av_log(NULL, AV_LOG_ERROR, "decompression incorrect\n");
else
- av_log(NULL, AV_LOG_ERROR, "decompression ok\n");
+ av_log(NULL, AV_LOG_ERROR, "decompression OK\n");
return 0;
}
#endif
projects / ffmpeg / blobdiff