redis.c split into many different C files.

[redis.git] / src / lzf_d.c

diff --git a/src/lzf_d.c b/src/lzf_d.c
new file mode 100644 (file)
index 0000000..e7e48c1
--- /dev/null
+++ b/src/lzf_d.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
+ * 
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ * 
+ *   1.  Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ * 
+ *   2.  Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License ("GPL") version 2 or any later version,
+ * in which case the provisions of the GPL are applicable instead of
+ * the above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the BSD license, indicate your decision
+ * by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file under
+ * either the BSD or the GPL.
+ */
+
+#include "lzfP.h"
+
+#if AVOID_ERRNO
+# define SET_ERRNO(n)
+#else
+# include <errno.h>
+# define SET_ERRNO(n) errno = (n)
+#endif
+
+/*
+#if (__i386 || __amd64) && __GNUC__ >= 3
+# define lzf_movsb(dst, src, len)                \
+   asm ("rep movsb"                              \
+        : "=D" (dst), "=S" (src), "=c" (len)     \
+        :  "0" (dst),  "1" (src),  "2" (len));
+#endif
+*/
+
+unsigned int 
+lzf_decompress (const void *const in_data,  unsigned int in_len,
+                void             *out_data, unsigned int out_len)
+{
+  u8 const *ip = (const u8 *)in_data;
+  u8       *op = (u8 *)out_data;
+  u8 const *const in_end  = ip + in_len;
+  u8       *const out_end = op + out_len;
+
+  do
+    {
+      unsigned int ctrl = *ip++;
+
+      if (ctrl < (1 << 5)) /* literal run */
+        {
+          ctrl++;
+
+          if (op + ctrl > out_end)
+            {
+              SET_ERRNO (E2BIG);
+              return 0;
+            }
+
+#if CHECK_INPUT
+          if (ip + ctrl > in_end)
+            {
+              SET_ERRNO (EINVAL);
+              return 0;
+            }
+#endif
+
+#ifdef lzf_movsb
+          lzf_movsb (op, ip, ctrl);
+#else
+          do
+            *op++ = *ip++;
+          while (--ctrl);
+#endif
+        }
+      else /* back reference */
+        {
+          unsigned int len = ctrl >> 5;
+
+          u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
+
+#if CHECK_INPUT
+          if (ip >= in_end)
+            {
+              SET_ERRNO (EINVAL);
+              return 0;
+            }
+#endif
+          if (len == 7)
+            {
+              len += *ip++;
+#if CHECK_INPUT
+              if (ip >= in_end)
+                {
+                  SET_ERRNO (EINVAL);
+                  return 0;
+                }
+#endif
+            }
+
+          ref -= *ip++;
+
+          if (op + len + 2 > out_end)
+            {
+              SET_ERRNO (E2BIG);
+              return 0;
+            }
+
+          if (ref < (u8 *)out_data)
+            {
+              SET_ERRNO (EINVAL);
+              return 0;
+            }
+
+#ifdef lzf_movsb
+          len += 2;
+          lzf_movsb (op, ref, len);
+#else
+          *op++ = *ref++;
+          *op++ = *ref++;
+
+          do
+            *op++ = *ref++;
+          while (--len);
+#endif
+        }
+    }
+  while (ip < in_end);
+
+  return op - (u8 *)out_data;
+}
+