avutil: Move memcpy_backptr() to mem.c

The function is used elsewhere and does not belong with the LZO code.

libavcodec/dfa.c

@@ -24,7 +24,7 @@
 #include "bytestream.h"
 
 #include "libavutil/imgutils.h"
-#include "libavutil/lzo.h" // for av_memcpy_backptr
+#include "libavutil/mem.h"
 
 typedef struct DfaContext {
     AVFrame pic;

libavcodec/eatgv.c

@@ -31,8 +31,8 @@
 #include "avcodec.h"
 #define BITSTREAM_READER_LE
 #include "get_bits.h"
-#include "libavutil/lzo.h"
 #include "libavutil/imgutils.h"
+#include "libavutil/mem.h"
 
 #define EA_PREAMBLE_SIZE    8
 #define kVGT_TAG MKTAG('k', 'V', 'G', 'T')

libavcodec/g723_1.c

@@ -27,7 +27,7 @@
 
 #define BITSTREAM_READER_LE
 #include "libavutil/audioconvert.h"
-#include "libavutil/lzo.h"
+#include "libavutil/mem.h"
 #include "libavutil/opt.h"
 #include "avcodec.h"
 #include "get_bits.h"

libavcodec/lcldec.c

@@ -41,10 +41,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "libavutil/mem.h"
 #include "avcodec.h"
 #include "bytestream.h"
 #include "lcl.h"
-#include "libavutil/lzo.h"
 
 #if CONFIG_ZLIB_DECODER
 #include <zlib.h>

libavcodec/wmavoice.c

@@ -29,6 +29,7 @@
 
 #include <math.h>
 
+#include "libavutil/mem.h"
 #include "dsputil.h"
 #include "avcodec.h"
 #include "get_bits.h"
@@ -38,7 +39,6 @@
 #include "acelp_vectors.h"
 #include "acelp_filters.h"
 #include "lsp.h"
-#include "libavutil/lzo.h"
 #include "dct.h"
 #include "rdft.h"
 #include "sinewin.h"

libavcodec/xan.c

@@ -33,12 +33,11 @@
 #include <string.h>
 
 #include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
 #include "avcodec.h"
 #include "bytestream.h"
 #define BITSTREAM_READER_LE
 #include "get_bits.h"
-// for av_memcpy_backptr
-#include "libavutil/lzo.h"
 
 #define RUNTIME_GAMMA 0
 

libavcodec/xxan.c

@@ -22,11 +22,10 @@
 
 #include "avcodec.h"
 #include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
 #include "bytestream.h"
 #define BITSTREAM_READER_LE
 #include "get_bits.h"
-// for av_memcpy_backptr
-#include "libavutil/lzo.h"
 
 typedef struct XanContext {
     AVCodecContext *avctx;

libavutil/lzo.c

@@ -100,8 +100,6 @@ static inline void copy(LZOContext *c, int cnt)
     c->out = dst + cnt;
 }
 
-static inline void memcpy_backptr(uint8_t *dst, int back, int cnt);
-
 /**
  * @brief Copies previously decoded bytes to current position.
  * @param back how many bytes back we start
@@ -122,50 +120,10 @@ static inline void copy_backptr(LZOContext *c, int back, int cnt)
         cnt       = FFMAX(c->out_end - dst, 0);
         c->error |= AV_LZO_OUTPUT_FULL;
     }
-    memcpy_backptr(dst, back, cnt);
+    av_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);
-    } else {
-        if (cnt >= 4) {
-            AV_COPY16U(dst,     src);
-            AV_COPY16U(dst + 2, src + 2);
-            src += 4;
-            dst += 4;
-            cnt -= 4;
-        }
-        if (cnt >= 8) {
-            AV_COPY16U(dst,     src);
-            AV_COPY16U(dst + 2, src + 2);
-            AV_COPY16U(dst + 4, src + 4);
-            AV_COPY16U(dst + 6, src + 6);
-            src += 8;
-            dst += 8;
-            cnt -= 8;
-        }
-        if (cnt > 0) {
-            int blocklen = back;
-            while (cnt > blocklen) {
-                memcpy(dst, src, blocklen);
-                dst       += blocklen;
-                cnt       -= blocklen;
-                blocklen <<= 1;
-            }
-            memcpy(dst, src, cnt);
-        }
-    }
-}
-
-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;

libavutil/lzo.h

@@ -59,17 +59,6 @@
  */
 int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen);
 
-/**
- * @brief deliberately overlapping memcpy implementation
- * @param dst destination buffer
- * @param back how many bytes back we start (the initial size of the overlapping window)
- * @param 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.
- */
-void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
-
 /**
  * @}
  */

libavutil/mem.c

@@ -27,6 +27,7 @@
 #include "config.h"
 
 #include <limits.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #if HAVE_MALLOC_H
@@ -34,6 +35,7 @@
 #endif
 
 #include "avutil.h"
+#include "intreadwrite.h"
 #include "mem.h"
 
 /* here we can use OS-dependent allocation functions */
@@ -177,3 +179,38 @@ char *av_strdup(const char *s)
     }
     return ptr;
 }
+
+void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
+{
+    const uint8_t *src = &dst[-back];
+    if (back == 1) {
+        memset(dst, *src, cnt);
+    } else {
+        if (cnt >= 4) {
+            AV_COPY16U(dst,     src);
+            AV_COPY16U(dst + 2, src + 2);
+            src += 4;
+            dst += 4;
+            cnt -= 4;
+        }
+        if (cnt >= 8) {
+            AV_COPY16U(dst,     src);
+            AV_COPY16U(dst + 2, src + 2);
+            AV_COPY16U(dst + 4, src + 4);
+            AV_COPY16U(dst + 6, src + 6);
+            src += 8;
+            dst += 8;
+            cnt -= 8;
+        }
+        if (cnt > 0) {
+            int blocklen = back;
+            while (cnt > blocklen) {
+                memcpy(dst, src, blocklen);
+                dst       += blocklen;
+                cnt       -= blocklen;
+                blocklen <<= 1;
+            }
+            memcpy(dst, src, cnt);
+        }
+    }
+}

libavutil/mem.h

@@ -27,6 +27,7 @@
 #define AVUTIL_MEM_H
 
 #include <limits.h>
+#include <stdint.h>
 
 #include "attributes.h"
 #include "avutil.h"
@@ -164,6 +165,17 @@ char *av_strdup(const char *s) av_malloc_attrib;
  */
 void av_freep(void *ptr);
 
+/**
+ * @brief deliberately overlapping memcpy implementation
+ * @param dst destination buffer
+ * @param back how many bytes back we start (the initial size of the overlapping window)
+ * @param 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.
+ */
+void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
+
 /**
  * @}
  */