1 files changed, 151 insertions, 0 deletions
diff --git a/src/net/messagein.cpp b/src/net/messagein.cpp
new file mode 100644
index 00000000..2710d132
--- /dev/null
+++ b/src/net/messagein.cpp
@@ -0,0 +1,151 @@
+/*
+ *  The Mana World
+ *  Copyright 2004 The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  The Mana World 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
+ *  any later version.
+ *
+ *  The Mana World 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 The Mana World; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  $Id$
+ */
+
+#include "messagein.h"
+#include <SDL_net.h>
+#ifdef MACOSX
+#include "win2mac.h"
+#endif
+
+#define MAKEWORD(low,high) \
+    ((unsigned short)(((unsigned char)(low)) | \
+    ((unsigned short)((unsigned char)(high))) << 8))
+
+
+MessageIn::MessageIn(const char *data, unsigned int length):
+    mData(data),
+    mLength(length),
+    mPos(0)
+{
+    // Read the message ID
+    mId = readShort();
+}
+
+char
+MessageIn::readByte()
+{
+    assert(mPos < mLength);
+    return mData[mPos++];
+}
+
+short
+MessageIn::readShort()
+{
+    assert(mPos + 2 <= mLength);
+    mPos += 2;
+#ifdef MACOSX
+    return DR_SwapTwoBytes(*(short*)(mData + (mPos - 2)));
+#else
+    return (*(short*)(mData + (mPos - 2)));
+#endif
+}
+
+long
+MessageIn::readLong()
+{
+    assert(mPos + 4 <= mLength);
+    mPos += 4;
+#ifdef MACOSX
+    return DR_SwapFourBytes(*(long*)(mData + (mPos - 4)));
+#else
+    return (*(long*)(mData + (mPos - 4)));
+#endif
+}
+
+void
+MessageIn::readCoordinates(unsigned short &x,
+                           unsigned short &y,
+                           unsigned char &direction)
+{
+    assert(mPos + 3 <= mLength);
+
+    const char *data = mData + mPos;
+    short temp;
+
+    temp = MAKEWORD(data[1] & 0x00c0, data[0] & 0x00ff);
+    x = temp >> 6;
+    temp = MAKEWORD(data[2] & 0x00f0, data[1] & 0x003f);
+    y = temp >> 4;
+
+    direction = data[2] & 0x000f;
+
+    mPos += 3;
+}
+
+void
+MessageIn::readCoordinatePair(unsigned short &srcX, unsigned short &srcY,
+                   unsigned short &dstX, unsigned short &dstY)
+{
+    assert(mPos + 5 <= mLength);
+
+    const char *data = mData + mPos;
+    short temp;
+
+    temp = MAKEWORD(data[3], data[2] & 0x000f);
+    dstX = temp >> 2;
+
+    dstY = MAKEWORD(data[4], data[3] & 0x0003);
+
+    temp = MAKEWORD(data[1], data[0]);
+    srcX = temp >> 6;
+
+    temp = MAKEWORD(data[2], data[1] & 0x003f);
+    srcY = temp >> 4;
+
+    mPos += 5;
+}
+
+void
+MessageIn::skip(unsigned int length)
+{
+    assert(mPos + length <= mLength);
+    mPos += length;
+}
+
+std::string
+MessageIn::readString(int length)
+{
+    int stringLength = 0;
+    std::string readString = "";
+
+    // Get string length
+    if (length < 0) {
+        stringLength = readShort();
+    } else {
+        stringLength = length;
+    }
+
+    // Make sure there is enough data available
+    assert(mPos + length <= mLength);
+
+    // Read the string
+    char *tmpString = new char[stringLength + 1];
+    memcpy(tmpString, (void*)&mData[mPos], stringLength);
+    tmpString[stringLength] = 0;
+    mPos += stringLength;
+
+    readString = tmpString;
+    delete tmpString;
+
+    return readString;
+}