1 files changed, 162 insertions, 0 deletions
diff --git a/engines/bladerunner/decompress_lcw.cpp b/engines/bladerunner/decompress_lcw.cpp
new file mode 100644
index 0000000000..e632ec7714
--- /dev/null
+++ b/engines/bladerunner/decompress_lcw.cpp
@@ -0,0 +1,162 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "bladerunner/decompress_lcw.h"
+
+#include "common/util.h"
+
+namespace BladeRunner {
+
+uint32 decompress_lcw(uint8 *inBuf, uint32 inLen, uint8 *outBuf, uint32 outLen) {
+	int version = 1;
+	int count, i, color, pos, relpos, out_remain;
+
+	uint8 *src = inBuf;
+	uint8 *dst = outBuf;
+	uint8 *outEnd = dst + outLen;
+
+	if (src[0] == 0)
+	{
+		version = 2;
+		++src;
+	}
+
+	while (src[0] != 0x80 && src < inBuf + inLen && dst < outEnd)
+	{
+		out_remain = (int)(outEnd - dst);
+
+		if (src[0] == 0xff)      // 0b11111111
+		{
+			count = src[1] | (src[2] << 8);
+			pos   = src[3] | (src[4] << 8);
+			src += 5;
+			count = MIN(count, out_remain);
+
+			if (version == 1)
+			{
+				for (i = 0; i < count; i++)
+					dst[i] = outBuf[i + pos];
+			}
+			else
+			{
+				for (i = 0; i < count; i++)
+					dst[i] = *(dst + i - pos);
+			}
+		}
+		else if (src[0] == 0xfe) // 0b11111110
+		{
+			count = src[1] | (src[2] << 8);
+			color = src[3];
+			src += 4;
+			count = MIN(count, out_remain);
+
+			memset(dst, color, count);
+		}
+		else if (src[0] >= 0xc0)  // 0b11??????
+		{
+			count = (src[0] & 0x3f) + 3;
+			pos   = src[1] | (src[2] << 8);
+			src += 3;
+			count = MIN(count, out_remain);
+
+			if (version == 1)
+			{
+				for (i = 0; i < count; i++)
+					dst[i] = outBuf[i + pos];
+			}
+			else
+			{
+				for (i = 0; i < count; i++)
+					dst[i] = *(dst + i - pos);
+			}
+		}
+		else if (src[0] >= 0x80)  // 0b10??????
+		{
+			count = src[0] & 0x3f;
+			++src;
+			count = MIN(count, out_remain);
+
+			memcpy(dst, src, count);
+			src += count;
+		}
+		else                     // 0b0???????
+		{
+			count  = ((src[0] & 0x70) >> 4) + 3;
+			relpos = ((src[0] & 0x0f) << 8) | src[1];
+			src += 2;
+			count = MIN(count, out_remain);
+
+			for (i = 0; i < count; i++)
+			{
+				dst[i] = *(dst + i - relpos);
+			}
+		}
+
+		dst += count;
+	}
+
+	return uint32(dst - outBuf);
+}
+
+uint32 decompress_lcw_output_size(uint8 *inBuf, uint32 inLen) {
+	int count;
+	uint8 *src     = inBuf;
+	uint32 outsize = 0;
+
+	if (src[0] == 0)
+		++src;
+
+	while (src[0] != 0x80 && src < inBuf + inLen)
+	{
+		if (src[0] == 0xff)      // 0b11111111
+		{
+			count = src[1] | (src[2] << 8);
+			src += 5;
+		}
+		else if (src[0] == 0xfe) // 0b11111110
+		{
+			count = src[1] | (src[2] << 8);
+			src += 4;
+		}
+		else if (src[0] >= 0xc0)  // 0b11??????
+		{
+			count = (src[0] & 0x3f) + 3;
+			src += 3;
+		}
+		else if (src[0] & 0x80)  // 0b10??????
+		{
+			count = src[0] & 0x3f;
+			src += count + 1;
+		}
+		else                     // 0b0???????
+		{
+			count  = ((src[0] & 0x70) >> 4) + 3;
+			src += 2;
+		}
+
+		outsize += count;
+	}
+
+	return outsize;
+}
+
+}; // End of namespace BladeRunner