From e26d0c62e07d1b1c1087a065242ed7ab1a2c522f Mon Sep 17 00:00:00 2001
From: Marcin Bukat <marcin.bukat@gmail.com>
Date: Sun, 31 Oct 2010 12:40:49 +0000
Subject: Fix and extend imageviewer png support. FS#11641 by me

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28413 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/imageviewer/png/tinfzlib.c | 100 ++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 apps/plugins/imageviewer/png/tinfzlib.c

(limited to 'apps/plugins/imageviewer/png/tinfzlib.c')

diff --git a/apps/plugins/imageviewer/png/tinfzlib.c b/apps/plugins/imageviewer/png/tinfzlib.c
new file mode 100644
index 0000000000..711b6cf2e9
--- /dev/null
+++ b/apps/plugins/imageviewer/png/tinfzlib.c
@@ -0,0 +1,100 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Original source:
+ * Copyright (c) 2003 by Joergen Ibsen / Jibz
+ *
+ * Rockbox adaptation:
+ * Copyright (c) 2010 by Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+/*
+ * tinfzlib  -  tiny zlib decompressor
+ *
+ * Copyright (c) 2003 by Joergen Ibsen / Jibz
+ * All Rights Reserved
+ *
+ * http://www.ibsensoftware.com/
+ *
+ * This software is provided 'as-is', without any express
+ * or implied warranty.  In no event will the authors be
+ * held liable for any damages arising from the use of
+ * this software.
+ *
+ * Permission is granted to anyone to use this software
+ * for any purpose, including commercial applications,
+ * and to alter it and redistribute it freely, subject to
+ * the following restrictions:
+ *
+ * 1. The origin of this software must not be
+ *    misrepresented; you must not claim that you
+ *    wrote the original software. If you use this
+ *    software in a product, an acknowledgment in
+ *    the product documentation would be appreciated
+ *    but is not required.
+ *
+ * 2. Altered source versions must be plainly marked
+ *    as such, and must not be misrepresented as
+ *    being the original software.
+ *
+ * 3. This notice may not be removed or altered from
+ *    any source distribution.
+ */
+
+#include "tinf.h"
+
+/* This routine do not check adler32 checksum
+ * as it is tailored to be used as PNG decompressor
+ * and PNG has crc32 check of the compressed block
+ * already
+ */
+int tinf_zlib_uncompress(void *dest, unsigned int *destLen,
+                         const void *source, unsigned int sourceLen)
+{
+   unsigned char *src = (unsigned char *)source;
+   unsigned char *dst = (unsigned char *)dest;
+   int res;
+   unsigned char cmf, flg;
+
+   /* -- get header bytes -- */
+
+   cmf = src[0];
+   flg = src[1];
+
+   /* -- check format -- */
+
+   /* check checksum */
+   if (((cmf << 8) + flg) % 31) return TINF_DATA_ERROR;
+
+   /* check method is deflate */
+   if ((cmf & 0x0f) != 8) return TINF_DATA_ERROR;
+
+   /* check window size is valid */
+   if ((cmf >> 4) > 7) return TINF_DATA_ERROR;
+
+   /* check there is no preset dictionary */
+   if (flg & 0x20) return TINF_DATA_ERROR;
+
+   /* -- inflate -- */
+
+   res = tinf_uncompress(dst, destLen, src + 2, sourceLen - 6);
+
+   if (res != TINF_OK) return TINF_DATA_ERROR;
+
+   return TINF_OK;
+}
-- 
cgit v1.2.3