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zlb.c
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// data is ptr to just after ZLB header
// always returns 0
// DISPLAY WARNING: Type casts are NOT being printed
int zlbDecompress(void *data,uint compLen,void *out) {
byte bVar1;
byte bVar2;
ushort uVar3;
ushort *pIn;
ushort *puVar4;
byte *pOut;
uint iBit;
byte *lengths;
word *tbl2;
int iVar5;
byte *distances;
byte *tbl4;
int iVar6;
uint distance2;
uint distance;
uint blockType;
uint length;
byte *tbl5;
word *tbl6;
byte *pbVar7;
int iVar8;
int iVar9;
uint uVar10;
uint code;
int iVar11;
int pbVar16;
uint uVar12;
bool bVar13;
byte curByte;
uint shift;
uint shift2;
pOut = out + -1;
iBit = 0;
shift2 = 0;
pIn = data + 2;
do {
curByte = *pIn;
shift = shift2 & 0x1f;
distances = pIn + (iBit + 1 >> 3);
iBit = iBit + 1 & 7;
shift2 = 0x20 - iBit & 0x1f;
blockType = (*distances << shift2 & 0xff | *distances >> 0x20 - shift2 |
distances[1] << 8 - iBit) & 3;
pIn = distances + (iBit + 2 >> 3);
iBit = iBit + 2 & 7;
bVar13 = iBit < 0x21;
shift2 = 0x20 - iBit;
if (blockType == 0) {
// copy data to output
if (iBit != 0) {
pIn = pIn + 1;
iBit = 0;
}
uVar3 = *pIn;
puVar4 = pIn + 1;
pIn = pIn + 2;
length = uVar3 | *puVar4 << 8;
do {
bVar1 = *pIn;
pIn = pIn + 1;
pOut = pOut + 1;
*pOut = bVar1;
blockType = bVar13;
bVar13 = CARRY4(length,blockType - 1);
length += blockType - 1;
} while (length != 0);
}
else {
if (blockType == 1) {
// static huffman block with standard tree
lengths = zlb_symbols_std;
tbl2 = zlb_tbl2_std;
iVar5 = 9;
distances = zlb_distances_std;
tbl4 = zlb_tbl4_std;
iVar6 = 5;
}
else {
// compressed block with table
lengths = zlb_symbols_custom;
tbl2 = zlb_tbl2_custom;
distances = zlb_distances_custom;
tbl4 = zlb_tbl4_custom;
iVar5 = 8;
tbl5 = zlb_tree1;
do {
// read the trees
*tbl5 = 0;
tbl5 = tbl5 + 1;
iVar5 += -1;
} while (iVar5 != 0);
iVar5 = 0x13;
tbl5 = zlb_tree2;
do {
*tbl5 = 0;
tbl5 = tbl5 + 1;
iVar5 += -1;
} while (iVar5 != 0);
iVar5 = 0x10;
tbl6 = zlb_tree3;
do {
*tbl6 = 0;
tbl6 = tbl6 + 1;
iVar5 += -1;
} while (iVar5 != 0);
iVar5 = 0x120;
tbl5 = lengths;
do {
*tbl5 = 0;
tbl5 = tbl5 + 1;
iVar5 += -1;
} while (iVar5 != 0);
iVar5 = 0x10;
tbl6 = zlb_tree4;
do {
*tbl6 = 0;
tbl6 = tbl6 + 1;
iVar5 += -1;
} while (iVar5 != 0);
iVar5 = 0x20;
tbl5 = distances;
do {
*tbl5 = 0;
tbl5 = tbl5 + 1;
iVar5 += -1;
} while (iVar5 != 0);
iVar6 = ((*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit) & 0x1f) + 0x101;
tbl5 = pIn + (iBit + 5 >> 3);
iBit = iBit + 5 & 7;
shift2 = 0x20 - iBit & 0x1f;
iVar9 = ((*tbl5 << shift2 & 0xff | *tbl5 >> 0x20 - shift2 | tbl5[1] << 8 - iBit) & 0x1f) + 1
;
tbl5 = tbl5 + (iBit + 5 >> 3);
uVar12 = iBit + 5 & 7;
bVar1 = tbl5[1];
bVar2 = *tbl5;
blockType = 0x20 - uVar12 & 0x1f;
iBit = uVar12 + 4;
pIn = tbl5 + (iBit >> 3);
tbl5 = zlb_order;
iVar5 = 0;
while( true ) {
iBit &= 7;
shift2 = 0x20 - iBit;
if (iVar5 == ((bVar2 << blockType & 0xff | bVar2 >> 0x20 - blockType | bVar1 << 8 - uVar12
) & 0xf) + 4) break;
shift2 = (*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit) & 7;
zlb_tree2[zlb_order[iVar5]] = shift2;
iBit += 3;
zlb_tree1[shift2] = zlb_tree1[shift2] + 1;
pIn = pIn + (iBit >> 3);
iVar5 += 1;
}
iVar5 = 7;
while (zlb_tree1[iVar5] == 0) {
iVar5 += -1;
}
iVar11 = 1;
iVar8 = 0;
while (iVar11 <= iVar5) {
if (zlb_tree1[iVar11] != 0) {
zlb_tbl10[iVar11] = iVar8;
iVar8 += zlb_tree1[iVar11] << iVar5 - iVar11;
}
iVar11 += 1;
}
iVar8 = 0;
while (iVar8 < 0x13) {
tbl5 = zlb_tbl10;
blockType = zlb_tree2[iVar8];
if (blockType != 0) {
iVar11 = 0;
while (iVar11 < 1 << iVar5 - blockType) {
bVar1 = zlb_tbl10[blockType];
zlb_tbl10[blockType] = bVar1 + 1;
zlb_tbl11[bVar1] = iVar8;
iVar11 += 1;
}
}
iVar8 += 1;
}
tbl6 = zlb_tree3;
iVar8 = 0;
pbVar7 = lengths;
do {
blockType = 0;
if (8 - iVar5 < iBit) {
blockType = *(pIn + 1) << 8 - iBit;
}
uVar12 = iVar5 + 0x18U & 0x1f;
pbVar16 = ZEXT14(zlb_tbl11[zlb_tbl12[(*pIn << (shift2 & 0x1f) & 0xff |
*pIn >> 0x20 - (shift2 & 0x1f) | blockType) &
(1 << iVar5) - 1U] << uVar12 & 0xff |
zlb_tbl12[(*pIn << (shift2 & 0x1f) & 0xff |
*pIn >> 0x20 - (shift2 & 0x1f) | blockType) &
(1 << iVar5) - 1U] >> 0x20 - uVar12]);
pIn = pIn + (iBit + zlb_tree2[pbVar16] >> 3);
iBit = iBit + zlb_tree2[pbVar16] & 7;
bVar13 = iBit < 0x21;
shift2 = 0x20 - iBit;
if (pbVar16 == 0x10) {
blockType = ((*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit) & 3) + 3;
pIn = pIn + (iBit + 2 >> 3);
iBit = iBit + 2 & 7;
bVar13 = iBit < 0x21;
shift2 = 0x20 - iBit;
pbVar16 = tbl5;
}
else {
if (pbVar16 == 0x11) {
pbVar16 = 0;
blockType = ((*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit) & 7) + 3;
pIn = pIn + (iBit + 3 >> 3);
iBit = iBit + 3 & 7;
bVar13 = iBit < 0x21;
shift2 = 0x20 - iBit;
}
else {
if (pbVar16 == 0x12) {
pbVar16 = 0;
blockType = ((*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit) & 0x7f) + 0xb;
pIn = pIn + (iBit + 7 >> 3);
iBit = iBit + 7 & 7;
bVar13 = iBit < 0x21;
shift2 = 0x20 - iBit;
}
else {
blockType = 1;
}
}
}
do {
pbVar7[iVar8] = pbVar16;
iVar8 += 1;
tbl6[pbVar16] = tbl6[pbVar16] + 1;
if ((pbVar7 == zlb_symbols_custom) && (iVar8 == iVar6)) {
tbl6 = zlb_tree4;
iVar8 = 0;
pbVar7 = distances;
}
uVar12 = bVar13;
bVar13 = CARRY4(blockType,uVar12 - 1);
blockType += uVar12 - 1;
} while (blockType != 0);
tbl5 = pbVar16;
} while ((pbVar7 == zlb_symbols_custom) || (iVar8 < iVar9));
iVar5 = 0xf;
tbl6 = zlb_tree3 + 0xf;
while (*tbl6 == 0) {
tbl6 = tbl6 + -1;
iVar5 += -1;
}
iVar11 = 1;
iVar8 = 0;
while (iVar11 <= iVar5) {
if (zlb_tree3[iVar11] != 0) {
zlb_tbl13[iVar11] = iVar8;
iVar8 += zlb_tree3[iVar11] << iVar5 - iVar11;
}
iVar11 += 1;
}
iVar8 = 0;
while (iVar8 < iVar6) {
distance2 = zlb_symbols_custom[iVar8];
if (distance2 != 0) {
iVar11 = 0;
while (iVar11 < 1 << iVar5 - distance2) {
uVar3 = zlb_tbl13[distance2];
zlb_tbl13[distance2] = uVar3 + 1;
zlb_tbl2_custom[uVar3] = iVar8;
iVar11 += 1;
}
}
iVar8 += 1;
}
iVar6 = 0xf;
while (zlb_tree4[iVar6] == 0) {
iVar6 += -1;
}
iVar11 = 1;
iVar8 = 0;
while (iVar11 <= iVar6) {
if (zlb_tree4[iVar11] != 0) {
zlb_tbl14[iVar11] = iVar8;
iVar8 += zlb_tree4[iVar11] << iVar6 - iVar11;
}
iVar11 += 1;
}
iVar8 = 0;
while (iVar8 < iVar9) {
distance = zlb_distances_custom[iVar8];
if (distance != 0) {
iVar11 = 0;
while (iVar11 < 1 << iVar6 - distance) {
uVar3 = zlb_tbl14[distance];
zlb_tbl14[distance] = uVar3 + 1;
zlb_tbl4_custom[uVar3] = iVar8;
iVar11 += 1;
}
}
iVar8 += 1;
}
}
do {
uVar10 = (*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit | *(pIn + 1) << 0x10 - iBit) & (1 << iVar5) - 1U;
blockType = iVar5 - 8U & 0x1f;
uVar12 = iVar5 + 0x10U & 0x1f;
code = tbl2[zlb_tbl12[uVar10 & 0xff] << blockType & 0xffff |
zlb_tbl12[uVar10 & 0xff] >> 0x20 - blockType |
zlb_tbl12[uVar10 >> 8] << uVar12 & 0xff |
zlb_tbl12[uVar10 >> 8] >> 0x20 - uVar12];
pIn = pIn + (iBit + lengths[code] >> 3);
iBit = iBit + lengths[code] & 7;
shift2 = 0x20 - iBit;
if (code < 0x100) {
pOut = pOut + 1;
*pOut = tbl2[zlb_tbl12[uVar10 & 0xff] << blockType & 0xffff |
zlb_tbl12[uVar10 & 0xff] >> 0x20 - blockType |
zlb_tbl12[uVar10 >> 8] << uVar12 & 0xff |
zlb_tbl12[uVar10 >> 8] >> 0x20 - uVar12];
}
else {
if (code == 0x100) break;
uVar12 = zlb_lbase[(code - 0x101) * 2];
blockType = zlb_lbase[(code - 0x101) * 2 + 1];
if (blockType != 0) {
uVar12 += (*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit) & (1 << blockType) - 1U;
pIn = pIn + (iBit + blockType >> 3);
iBit = iBit + blockType & 7;
shift2 = 0x20 - iBit;
}
uVar10 = (*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit | *(pIn + 1) << 0x10 - iBit) & (1 << iVar6) - 1U;
shift2 = iVar6 - 8U & 0x1f;
blockType = iVar6 + 0x10U & 0x1f;
blockType = tbl4[zlb_tbl12[uVar10 & 0xff] << shift2 & 0xffff |
zlb_tbl12[uVar10 & 0xff] >> 0x20 - shift2 |
zlb_tbl12[uVar10 >> 8] << blockType & 0xff |
zlb_tbl12[uVar10 >> 8] >> 0x20 - blockType];
pIn = pIn + (iBit + distances[blockType] >> 3);
iBit = iBit + distances[blockType] & 7;
shift2 = 0x20 - iBit;
uVar10 = zlb_dbase[blockType * 2];
blockType = zlb_dbase[blockType * 2 + 1];
if (blockType != 0) {
uVar10 += (*pIn << (shift2 & 0x1f) & 0xff | *pIn >> 0x20 - (shift2 & 0x1f) |
*(pIn + 1) << 8 - iBit | *(pIn + 1) << 0x10 - iBit) & (1 << blockType) - 1U;
pIn = pIn + (iBit + blockType >> 3);
iBit = iBit + blockType & 7;
shift2 = 0x20 - iBit;
}
tbl5 = pOut + -uVar10;
do {
tbl5 = tbl5 + 1;
pOut = pOut + 1;
*pOut = *tbl5;
uVar12 -= 1;
} while (uVar12 != 0);
}
} while (code != 0x100);
}
if (((curByte << shift | curByte >> 0x20 - shift) & 1) != 0) {
return 0;
}
} while( true );
}