1 files changed, 60 insertions, 0 deletions
diff --git a/common/lz_common.h b/common/lz_common.h
new file mode 100644
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--- /dev/null
+++ b/common/lz_common.h
@@ -0,0 +1,60 @@
+/*
+   Copyright (C) 2009 Red Hat, Inc.
+
+   This library 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.
+
+   This library 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 this library; if not, write to the Free Software
+
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+/*common header for encoder and decoder*/
+
+#ifndef _LZ_COMMON_H
+#define _LZ_COMMON_H
+
+//#define DEBUG
+
+/* change the max window size will require change in the encoding format*/
+#define LZ_MAX_WINDOW_SIZE (1 << 25)
+#define MAX_COPY 32
+
+typedef enum {
+    LZ_IMAGE_TYPE_INVALID,
+    LZ_IMAGE_TYPE_PLT1_LE,
+    LZ_IMAGE_TYPE_PLT1_BE,      // PLT stands for palette
+    LZ_IMAGE_TYPE_PLT4_LE,
+    LZ_IMAGE_TYPE_PLT4_BE,
+    LZ_IMAGE_TYPE_PLT8,
+    LZ_IMAGE_TYPE_RGB16,
+    LZ_IMAGE_TYPE_RGB24,
+    LZ_IMAGE_TYPE_RGB32,
+    LZ_IMAGE_TYPE_RGBA
+} LzImageType;
+
+#define LZ_IMAGE_TYPE_MASK 0x0f
+#define LZ_IMAGE_TYPE_LOG 4 // number of bits required for coding the image type
+
+/* access to the arrays is based on the image types */
+static const int IS_IMAGE_TYPE_PLT[] = {0, 1, 1, 1, 1, 1, 0, 0, 0, 0};
+static const int IS_IMAGE_TYPE_RGB[] = {0, 0, 0, 0, 0, 0, 1, 1, 1, 1};
+static const int PLT_PIXELS_PER_BYTE[] = {0, 8, 8, 2, 2, 1};
+static const int RGB_BYTES_PER_PIXEL[] = {0, 1, 1, 1, 1, 1, 2, 3, 4, 4};
+
+
+#define LZ_MAGIC (*(uint32_t *)"LZ  ")
+#define LZ_VERSION_MAJOR 1U
+#define LZ_VERSION_MINOR 1U
+#define LZ_VERSION ((LZ_VERSION_MAJOR << 16) | (LZ_VERSION_MINOR & 0xffff))
+
+
+#endif  // _LZ_COMMON_H