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engines/toon/tools.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * This file is dual-licensed.
+ * In addition to the GPLv3 license mentioned above, MojoTouch has
+ * exclusively licensed this code on March 23th, 2024, to be used in
+ * closed-source products.
+ * Therefore, any contributions (commits) to it will also be dual-licensed.
+ *
+ */
+
+#include "common/debug.h"
+
+#include "toon/tools.h"
+#include "toon/toon.h"
+
+namespace Toon {
+
+uint32 decompressLZSS(byte *src, byte *dst, int dstsize) {
+	debugC(5, kDebugTools, "decompressLZSS(src, dst, %d)", dstsize);
+
+	byte *srcp = src;
+	byte *dstp = dst;
+	uint16 bitbuf;
+	int32 len, ofs;
+	len = 0;
+	while (dstsize > 0) {
+		bitbuf = 0x100 | *(srcp++);
+		while (bitbuf != 1 && dstsize > 0) {
+			if (bitbuf & 1) {
+				ofs = READ_LE_UINT16(srcp);
+				srcp += 2;
+				len = ((ofs & 0xF000) >> 12) + 3;
+				ofs = ofs | 0xF000;
+				dstsize -= len;
+				if (dstsize < 0)
+					break;
+				while (len--) {
+					*dstp = *(byte *)(dstp + (signed short)ofs);
+					dstp++;
+				}
+			} else {
+				len = 0;
+				while ((bitbuf & 2) == 0) {
+					len++;
+					bitbuf >>= 1;
+				}
+				len++;
+				dstsize -= len;
+				if (dstsize < 0)
+					break;
+				while (len--)
+					*(dstp++) = *(srcp++);
+			}
+			bitbuf >>= 1;
+		}
+	}
+
+	if (len == -1 && dstsize == 0) {
+		return (dstp - dst);
+	}
+
+	len += dstsize;
+	if (len < 0)
+		return 0;
+
+	while (len--)
+		*(dstp++) = *(srcp++);
+
+	return (dstp - dst);
+}
+
+uint32 decompressSPCN(byte *src, byte *dst, uint32 dstsize) {
+	debugC(1, kDebugTools, "decompressSPCN(src, dst, %d)", dstsize);
+
+	byte *srcp = src;
+	byte *dstp = dst, *dste = dst + dstsize;
+	byte val;
+	uint16 len, ofs;
+	if (!(*srcp & 0x80)) srcp++;
+	while (dstp < dste) {
+		val = *(srcp++);
+		if (val & 0x80) {
+			if (val & 0x40) {
+				if (val == 0xFE) {
+					len = READ_LE_UINT16(srcp);
+					while (len--)
+						*(dstp++) = srcp[2];
+					srcp += 3;
+				} else {
+					if (val == 0xFF) {
+						len = READ_LE_UINT16(srcp);
+						srcp += 2;
+					} else {
+						len = (val & 0x3F) + 3;
+					}
+					ofs = READ_LE_UINT16(srcp);
+					srcp += 2;
+					while (len--) {
+						*dstp = *(byte *)(dstp - ofs);
+						dstp++;
+					}
+				}
+			} else {
+				len = val & 0x3F;
+				while (len--)
+					*(dstp++) = *(srcp++);
+			}
+		} else {
+			len = (val >> 4) + 3;
+			ofs = ((val & 0x0F) << 8) | *(srcp++);
+			while (len--) {
+				*dstp = *(byte *)(dstp - ofs);
+				dstp++;
+			}
+		}
+	}
+	return (dstp - dst);
+}
+
+} // End of namespace Toon