extending calculation of visible region

[wxWidgets.git] / src / zlib / infcodes.c

diff --git a/src/zlib/infcodes.c b/src/zlib/infcodes.c
index bd0e94745aa90b84e62e2ee442adf7075f3b9aa8..04788d51a99a277c11f577f611750710a43b2b5d 100644 (file)
--- a/src/zlib/infcodes.c
+++ b/src/zlib/infcodes.c
@@ -1,5 +1,5 @@
 /* infcodes.c -- process literals and length/distance pairs
- * Copyright (C) 1995-1998 Mark Adler
+ * Copyright (C) 1995-2002 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -55,7 +55,7 @@ struct inflate_codes_state {
 
 };
 
-#if defined(__VISAGECPP__) // Visual game can't handle this antiquated interface
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
 inflate_codes_statef* inflate_codes_new(uInt bl, uInt bd, inflate_huft* tl, inflate_huft* td, z_streamp z)
 #else
 inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
@@ -80,7 +80,7 @@ z_streamp z;
   return c;
 }
 
-#if defined(__VISAGECPP__) // Visual game can't handle this antiquated interface
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
 int inflate_codes(inflate_blocks_statef* s, z_streamp z, int r)
 #else
 int inflate_codes(s, z, r)
@@ -202,15 +202,9 @@ int r;
       Tracevv((stderr, "inflate:         distance %u\n", c->sub.copy.dist));
       c->mode = COPY;
     case COPY:          /* o: copying bytes in window, waiting for space */
-#ifndef __TURBOC__ /* Turbo C bug for following expression */
-      f = (uInt)(q - s->window) < c->sub.copy.dist ?
-          s->end - (c->sub.copy.dist - (q - s->window)) :
-          q - c->sub.copy.dist;
-#else
       f = q - c->sub.copy.dist;
-      if ((uInt)(q - s->window) < c->sub.copy.dist)
-        f = s->end - (c->sub.copy.dist - (uInt)(q - s->window));
-#endif
+      while (f < s->window)             /* modulo window size-"while" instead */
+        f += s->end - s->window;        /* of "if" handles invalid distances */
       while (c->len)
       {
         NEEDOUT
@@ -227,6 +221,13 @@ int r;
       c->mode = START;
       break;
     case WASH:          /* o: got eob, possibly more output */
+      if (k > 7)        /* return unused byte, if any */
+      {
+        Assert(k < 16, "inflate_codes grabbed too many bytes")
+        k -= 8;
+        n++;
+        p--;            /* can always return one */
+      }
       FLUSH
       if (s->read != s->write)
         LEAVE
@@ -246,7 +247,7 @@ int r;
 #endif
 }
 
-#if defined(__VISAGECPP__) // Visual game can't handle this antiquated interface
+#if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
 void inflate_codes_free(inflate_codes_statef* c, z_streamp z)
 #else
 void inflate_codes_free(c, z)