From 8198f694f52b6a6284069a37b44bcce5847acdf2 Mon Sep 17 00:00:00 2001
From: Ralf Corsepius <ralf.corsepius@rtems.org>
Date: Fri, 18 Mar 2011 10:10:55 +0000
Subject: Import zlib-1.2.3

---
 cpukit/zlib/gzio.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

(limited to 'cpukit/zlib/gzio.c')

diff --git a/cpukit/zlib/gzio.c b/cpukit/zlib/gzio.c
index 217a4cc410..7e90f4928f 100644
--- a/cpukit/zlib/gzio.c
+++ b/cpukit/zlib/gzio.c
@@ -1,5 +1,5 @@
 /* gzio.c -- IO on .gz files
- * Copyright (C) 1995-2004 Jean-loup Gailly.
+ * Copyright (C) 1995-2005 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  *
  * Compile this file with -DNO_GZCOMPRESS to avoid the compression code.
@@ -264,7 +264,7 @@ local int get_byte(s)
     if (s->z_eof) return EOF;
     if (s->stream.avail_in == 0) {
         errno = 0;
-        s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+        s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file);
         if (s->stream.avail_in == 0) {
             s->z_eof = 1;
             if (ferror(s->file)) s->z_err = Z_ERRNO;
@@ -300,7 +300,7 @@ local void check_header(s)
     if (len < 2) {
         if (len) s->inbuf[0] = s->stream.next_in[0];
         errno = 0;
-        len = fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file);
+        len = (uInt)fread(s->inbuf + len, 1, Z_BUFSIZE >> len, s->file);
         if (len == 0 && ferror(s->file)) s->z_err = Z_ERRNO;
         s->stream.avail_in += len;
         s->stream.next_in = s->inbuf;
@@ -415,6 +415,7 @@ int ZEXPORT gzread (file, buf, len)
         s->stream.avail_out--;
         s->back = EOF;
         s->out++;
+        start++;
         if (s->last) {
             s->z_err = Z_STREAM_END;
             return 1;
@@ -436,8 +437,8 @@ int ZEXPORT gzread (file, buf, len)
                 s->stream.avail_in  -= n;
             }
             if (s->stream.avail_out > 0) {
-                s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
-                                             s->file);
+                s->stream.avail_out -=
+                    (uInt)fread(next_out, 1, s->stream.avail_out, s->file);
             }
             len -= s->stream.avail_out;
             s->in  += len;
@@ -448,17 +449,13 @@ int ZEXPORT gzread (file, buf, len)
         if (s->stream.avail_in == 0 && !s->z_eof) {
 
             errno = 0;
-            s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+            s->stream.avail_in = (uInt)fread(s->inbuf, 1, Z_BUFSIZE, s->file);
             if (s->stream.avail_in == 0) {
                 s->z_eof = 1;
                 if (ferror(s->file)) {
                     s->z_err = Z_ERRNO;
                     break;
                 }
-                if (feof(s->file)) {        /* avoid error for empty file */
-                    s->z_err = Z_STREAM_END;
-                    break;
-                }
             }
             s->stream.next_in = s->inbuf;
         }
@@ -492,6 +489,9 @@ int ZEXPORT gzread (file, buf, len)
     }
     s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
 
+    if (len == s->stream.avail_out &&
+        (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO))
+        return -1;
     return (int)(len - s->stream.avail_out);
 }
 
@@ -902,6 +902,18 @@ int ZEXPORT gzeof (file)
     return s->z_err == Z_STREAM_END;
 }
 
+/* ===========================================================================
+     Returns 1 if reading and doing so transparently, otherwise zero.
+*/
+int ZEXPORT gzdirect (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || s->mode != 'r') return 0;
+    return s->transparent;
+}
+
 /* ===========================================================================
    Outputs a long in LSB order to the given file
 */
@@ -966,9 +978,9 @@ int ZEXPORT gzclose (file)
 #endif
 
 /* ===========================================================================
-     Returns the error message for the last error which occured on the
+     Returns the error message for the last error which occurred on the
    given compressed file. errnum is set to zlib error number. If an
-   error occured in the file system and not in the compression library,
+   error occurred in the file system and not in the compression library,
    errnum is set to Z_ERRNO and the application may consult errno
    to get the exact error code.
 */
-- 
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