62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
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#include "dungeonman.h"
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#include "common/file.h"
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namespace DM {
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DungeonMan::DungeonMan(DMEngine *dmEngine) : _vm(dmEngine), _dungeonDataSize(0), _dungeonData(NULL) {}
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DungeonMan::~DungeonMan() { delete[] _dungeonData; }
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void DungeonMan::loadDungeonFile() {
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Common::File f;
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f.open("Dungeon.dat");
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if (f.readUint16BE() == 0x8104) {
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_dungeonDataSize = f.readUint32BE();
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_dungeonData = new byte[_dungeonDataSize];
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f.readUint16BE();
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byte common[4];
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for (uint16 i = 0; i < 4; ++i)
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common[i] = f.readByte();
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byte lessCommon[16];
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for (uint16 i = 0; i < 16; ++i)
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lessCommon[i] = f.readByte();
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// start unpacking
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uint32 uncompIndex = 0;
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uint8 bitsUsedInWord = 0;
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uint16 wordBuff = f.readUint16BE();
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uint8 bitsLeftInByte = 8;
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byte byteBuff = f.readByte();
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while (uncompIndex < _dungeonDataSize) {
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while (bitsUsedInWord != 0) {
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uint8 shiftVal;
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if (f.eos()) {
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shiftVal = bitsUsedInWord;
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wordBuff <<= shiftVal;
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} else {
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shiftVal = MIN(bitsLeftInByte, bitsUsedInWord);
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wordBuff <<= shiftVal;
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wordBuff |= (byteBuff >> (8 - shiftVal));
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byteBuff <<= shiftVal;
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bitsLeftInByte -= shiftVal;
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if (!bitsLeftInByte) {
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byteBuff = f.readByte();
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bitsLeftInByte = 8;
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}
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}
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bitsUsedInWord -= shiftVal;
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}
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if (((wordBuff >> 15) & 1) == 0) {
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_dungeonData[uncompIndex++] = common[(wordBuff >> 13) & 3];
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bitsUsedInWord += 3;
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} else if (((wordBuff >> 14) & 3) == 2) {
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_dungeonData[uncompIndex++] = lessCommon[(wordBuff >> 10) & 15];
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bitsUsedInWord += 6;
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} else if (((wordBuff >> 14) & 3) == 3) {
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_dungeonData[uncompIndex++] = (wordBuff >> 6) & 255;
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bitsUsedInWord += 10;
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}
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}
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}
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f.close();
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}
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}
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