LZW decoder as separate module plus TIFF LZW support

Originally committed as revision 6795 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 49 insertions, 0 deletions

diff --git a/libavcodec/lzw.h b/libavcodec/lzw.h
new file mode 100644
index 0000000000..60f115caf7
--- /dev/null
+++ b/libavcodec/lzw.h
@@ -0,0 +1,49 @@
+/*
+ * LZW decoder
+ * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2006 Konstantin Shishkov.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file lzw.h
+ * @brief LZW decoding routines
+ * @author Fabrice Bellard
+ * Modified for use in TIFF by Konstantin Shishkov
+ */
+
+#ifndef LZW_H
+#define LZW_H
+
+enum FF_LZW_MODES{
+    FF_LZW_GIF,
+    FF_LZW_TIFF
+};
+
+/* clients should not know what LZWState is */
+typedef void LZWState;
+
+/* first two functions de/allocate memory for LZWState */
+void ff_lzw_decode_open(LZWState **p);
+void ff_lzw_decode_close(LZWState **p);
+int ff_lzw_decode_init(LZWState *s, int csize, uint8_t *buf, int buf_size, int mode);
+int ff_lzw_decode(LZWState *s, uint8_t *buf, int len);
+uint8_t* ff_lzw_cur_ptr(LZWState *lzw);
+void ff_lzw_decode_tail(LZWState *lzw);
+
+#endif