Patch for escher.c

[Robert Wilhelm]

Hi Dom,

appended patch speeds up escher.c and I can now load
#2393 and #2867 in reasonable time even if
amsofbh->cbLength is bogus. 


Robert

Index: support.c
===================================================================
RCS file: /cvsroot/wv/support.c,v
retrieving revision 1.25
diff -u -r1.25 support.c
--- support.c   19 Feb 2002 10:04:51 -0000      1.25
+++ support.c   12 Mar 2002 18:46:18 -0000
@@ -111,6 +111,27 @@
     streams = listEntry;
 }
 
+static size_t memorystream_read(MemoryStream *stream, void *buf, size_t count)
+{
+  size_t ret;
+
+  if ( stream->current + count < stream->size)
+    {  
+      memcpy(buf, stream->mem + stream->current, count);
+      stream->current += count;
+      ret = count;
+    }
+  else
+    {
+      ret = stream->size - stream->current;
+      memcpy(buf, stream->mem + stream->current, ret);
+      memset(buf + ret , 0, count - ret);
+      stream->current = stream->size;
+      wvTrace(("read out of bounds\n"));
+    }
+  return ret;
+}
+
 U32
 read_32ubit (wvStream * in)
 {
@@ -134,9 +155,7 @@
       }
     else
       {
-       ret =  *((U32 *) (in->stream.memory_stream->mem + 
-                in->stream.memory_stream->current));
-       in->stream.memory_stream->current +=4;
+       memorystream_read(in->stream.memory_stream, &ret, 4);
       }
 #endif
     return (ret);
@@ -165,9 +184,7 @@
       }
     else
       {
-       ret =  *((U16 *) (in->stream.memory_stream->mem + 
-                in->stream.memory_stream->current));
-       in->stream.memory_stream->current+=2;
+       memorystream_read(in->stream.memory_stream, &ret, 2);
       }
 
 
@@ -192,9 +209,7 @@
     else
       {
          U8 ret;
-         ret =  *((U8 *)(in->stream.memory_stream->mem + 
-                in->stream.memory_stream->current));
-         in->stream.memory_stream->current++;
+         memorystream_read(in->stream.memory_stream, &ret, 1);
          return ret;
       }
 }
@@ -213,9 +228,7 @@
       }
     else
       {
-       memcpy(ptr, in->stream.memory_stream->mem + 
-                    in->stream.memory_stream->current,size * nmemb);
-       in->stream.memory_stream->current+=size* nmemb;
+       return memorystream_read(in->stream.memory_stream, ptr, size * nmemb);
        return size * nmemb;
       }
 }