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LURE: Converted the AnimationDecoder::decode_data routine to remove GOTO usage

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This commit is contained in:
Paul Gilbert 2011-12-09 14:15:00 +11:00
parent f169e17eca
commit 77326a5e27
1 changed files with 108 additions and 102 deletions
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210
engines/lure/decode.cpp
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@ -372,92 +372,54 @@ uint32 AnimationDecoder::decode_data(MemoryBlock *src, MemoryBlock *dest, uint32
currData <<= 4;
dx = 1;
for (;;) {
carry = false;
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
if (carry) goto loc_1441;
tableOffset = BX_VAL(0);
loc_1439:
dx ^= 1;
if ((dx & 1) != 0) {
SET_HI_BYTE(dx, tableOffset << 4);
*pDest = dx >> 8;
} else {
*pDest++ |= tableOffset;
}
continue;
loc_1441:
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
if (!carry) {
// Main loop
bool loopFlag = true;
while (loopFlag) {
for (;;) {
carry = false;
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
if (!carry) {
tableOffset = BX_VAL(0x10);
} else {
tableOffset = BX_VAL(0x20);
tableOffset = BX_VAL(0);
break;
}
goto loc_1439;
}
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
if (!carry) {
tableOffset = BX_VAL(0x30);
goto loc_1439;
}
SET_HI_BYTE(dx, currData >> 12);
carry = false;
for (int ctr = 0; ctr < 4; ++ctr) {
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
}
if (!carry) {
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
byte dxHigh = dx >> 8;
if (dxHigh == BX_VAL(0)) {
tempReg1 = bitCtr;
tempReg2 = dx;
decode_data_2(src, pSrc, currData, bitCtr, dx, carry);
SET_LO_BYTE(dx, dx >> 8);
decode_data_2(src, pSrc, currData, bitCtr, dx, carry);
SET_HI_BYTE(bitCtr, dx & 0xff);
SET_LO_BYTE(bitCtr, dx >> 8);
dx = tempReg2;
if (bitCtr == 0)
// Exit out of infinite loop
if (!carry) {
tableOffset = BX_VAL(0x10);
} else {
tableOffset = BX_VAL(0x20);
}
break;
}
} else if (dxHigh == BX_VAL(0x10)) {
tempReg1 = bitCtr;
decode_data_2(src, pSrc, currData, bitCtr, dx, carry);
bitCtr = dx >> 8;
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
if (!carry) {
tableOffset = BX_VAL(0x30);
break;
}
} else if (dxHigh == BX_VAL(0x20)) {
SET_HI_BYTE(dx, currData >> 10);
for (v = 0; v < 6; ++v) {
SET_HI_BYTE(dx, currData >> 12);
carry = false;
for (int ctr = 0; ctr < 4; ++ctr) {
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
@ -465,48 +427,92 @@ loc_1441:
}
}
tempReg1 = bitCtr;
bitCtr = dx >> 8;
byte dxHigh = dx >> 8;
if (dxHigh == BX_VAL(0)) {
tempReg1 = bitCtr;
tempReg2 = dx;
decode_data_2(src, pSrc, currData, bitCtr, dx, carry);
} else if (dxHigh == BX_VAL(0x30)) {
SET_HI_BYTE(dx, currData >> 11);
SET_LO_BYTE(dx, dx >> 8);
decode_data_2(src, pSrc, currData, bitCtr, dx, carry);
SET_HI_BYTE(bitCtr, dx & 0xff);
SET_LO_BYTE(bitCtr, dx >> 8);
dx = tempReg2;
for (v = 0; v < 5; ++v) {
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
if (bitCtr == 0) {
// End of decompression
loopFlag = false;
break;
}
} else if (dxHigh == BX_VAL(0x10)) {
tempReg1 = bitCtr;
decode_data_2(src, pSrc, currData, bitCtr, dx, carry);
bitCtr = dx >> 8;
} else if (dxHigh == BX_VAL(0x20)) {
SET_HI_BYTE(dx, currData >> 10);
for (v = 0; v < 6; ++v) {
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
}
tempReg1 = bitCtr;
bitCtr = dx >> 8;
} else if (dxHigh == BX_VAL(0x30)) {
SET_HI_BYTE(dx, currData >> 11);
for (v = 0; v < 5; ++v) {
rcl(currData, carry);
if (--bitCtr == 0) {
GET_BYTE;
bitCtr = 8;
}
}
tempReg1 = bitCtr;
bitCtr = dx >> 8;
} else {
tableOffset = dx >> 8;
break;
}
tempReg1 = bitCtr;
bitCtr = dx >> 8;
if ((dx & 1) == 1) {
*pDest++ |= tableOffset;
--bitCtr;
dx &= 0xfffe;
}
} else {
tableOffset = dx >> 8;
goto loc_1439;
SET_HI_BYTE(dx, tableOffset << 4);
tableOffset |= dx >> 8;
v = bitCtr >> 1;
while (v-- > 0) *pDest++ = tableOffset;
bitCtr &= 1;
if (bitCtr != 0) {
*pDest = tableOffset & 0xf0;
dx |= 1; //dx.l
}
bitCtr = tempReg1;
tableOffset &= 0x0f;
}
if ((dx & 1) == 1) {
*pDest++ |= tableOffset;
--bitCtr;
dx &= 0xfffe;
if (loopFlag) {
dx ^= 1;
if ((dx & 1) != 0) {
SET_HI_BYTE(dx, tableOffset << 4);
*pDest = dx >> 8;
} else {
*pDest++ |= tableOffset;
}
}
SET_HI_BYTE(dx, tableOffset << 4);
tableOffset |= dx >> 8;
v = bitCtr >> 1;
while (v-- > 0) *pDest++ = tableOffset;
bitCtr &= 1;
if (bitCtr != 0) {
*pDest = tableOffset & 0xf0;
dx |= 1; //dx.l
}
bitCtr = tempReg1;
tableOffset &= 0x0f;
}
// Return number of bytes written