On Darwin, only use /usr/bin/libtool if libtool is not Apple.

[zlib.git] / gzread.c

diff --git a/gzread.c b/gzread.c
index 09e586366fc7edf9db6ca1d512e72a4eb78f8fa8..8ace830273523cc42b735c9344ed2291dec4cb06 100644 (file)
--- a/gzread.c
+++ b/gzread.c
@@ -1,5 +1,5 @@
 /* gzread.c -- zlib functions for reading gzip files
- * Copyright (C) 2004, 2005, 2010, 2011 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -57,8 +57,13 @@ local int gz_avail(state)
     if (state->err != Z_OK && state->err != Z_BUF_ERROR)
         return -1;
     if (state->eof == 0) {
-        if (strm->avail_in)
-            memmove(state->in, strm->next_in, strm->avail_in);
+        if (strm->avail_in) {       /* copy what's there to the start */
+            unsigned char *p = state->in, *q = strm->next_in;
+            unsigned n = strm->avail_in;
+            do {
+                *p++ = *q++;
+            } while (--n);
+        }
         if (gz_load(state, state->in + strm->avail_in,
                     state->size - strm->avail_in, &got) == -1)
             return -1;
@@ -340,7 +345,7 @@ int ZEXPORT gzread(file, buf, len)
             /* get more output, looking for header if required */
             if (gz_fetch(state) == -1)
                 return -1;
-            continue;       /* no progress yet -- go back to memcpy() above */
+            continue;       /* no progress yet -- go back to copy above */
             /* the copy above assures that we will leave with space in the
                output buffer, allowing at least one gzungetc() to succeed */
         }
@@ -373,7 +378,12 @@ int ZEXPORT gzread(file, buf, len)
 }
 
 /* -- see zlib.h -- */
-int ZEXPORT gzgetc_(file)
+#ifdef Z_PREFIX_SET
+#  undef z_gzgetc
+#else
+#  undef gzgetc
+#endif
+int ZEXPORT gzgetc(file)
     gzFile file;
 {
     int ret;
@@ -390,10 +400,7 @@ int ZEXPORT gzgetc_(file)
         (state->err != Z_OK && state->err != Z_BUF_ERROR))
         return -1;
 
-    /* try output buffer (no need to check for skip request) -- while
-       this check really isn't required since the gzgetc() macro has
-       already determined that x.have is zero, we leave it in for
-       completeness. */
+    /* try output buffer (no need to check for skip request) */
     if (state->x.have) {
         state->x.have--;
         state->x.pos++;
@@ -405,6 +412,12 @@ int ZEXPORT gzgetc_(file)
     return ret < 1 ? -1 : buf[0];
 }
 
+int ZEXPORT gzgetc_(file)
+gzFile file;
+{
+    return gzgetc(file);
+}
+
 /* -- see zlib.h -- */
 int ZEXPORT gzungetc(c, file)
     int c;