1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
#include "egg/core/eggStreamDecomp.h"
namespace EGG {
// *********************************** LZ ********************************** //
bool StreamDecompLZ::init(void *pDest, u32 maxCompressedSize) {
mpDest = pDest;
mMaxCompressedSize = maxCompressedSize;
CXInitUncompContextLZ(&mContext);
return true;
}
bool StreamDecompLZ::decomp(const void *pSrc, u32 len) {
return CXReadUncompLZ(&mContext, pSrc, len) == CX_READ_OK;
}
// *********************************** RL ********************************** //
bool StreamDecompRL::init(void *pDest, u32 maxCompressedSize) {
mpDest = pDest;
mMaxCompressedSize = maxCompressedSize;
CXInitUncompContextRL(&mContext);
return true;
}
bool StreamDecompRL::decomp(const void *pSrc, u32 len) {
return CXReadUncompRL(&mContext, pSrc, len) == CX_READ_OK;
}
// *********************************** LH ********************************** //
bool StreamDecompLH::init(void *pDest, u32 maxCompressedSize) {
mpDest = pDest;
mMaxCompressedSize = maxCompressedSize;
CXInitUncompContextLH(&mContext);
return true;
}
bool StreamDecompLH::decomp(const void *pSrc, u32 len) {
return CXReadUncompLH(&mContext, pSrc, len) == CX_READ_OK;
}
// ********************************** LRC ********************************** //
bool StreamDecompLRC::init(void *pDest, u32 maxCompressedSize) {
mpDest = pDest;
mMaxCompressedSize = maxCompressedSize;
CXInitUncompContextLRC(&mContext);
return true;
}
bool StreamDecompLRC::decomp(const void *pSrc, u32 len) {
return CXReadUncompLRC(&mContext, pSrc, len) == CX_READ_OK;
}
// ********************************** SZS ********************************** //
u32 UncompContextSZS::getUncompressedSize(const void *pSrc) {
const u8 *pData = (u8 *)pSrc;
return (pData[4] << 24) | (pData[5] << 16) | (pData[6] << 8) | (pData[7] << 0);
}
void UncompContextSZS::initUncompContext(void *pDest) {
mpDest = (u8 *)pDest;
mUncompSize = 0;
mHeaderLen = 0x10;
mMaxUncompSize = 0;
mGroupHead = 0;
mSecondByte = 0;
mFirstByte = 0;
mState = 0;
mCopySrc = 0;
}
s32 UncompContextSZS::readHeader(u8 *pHeaderLen, s32 *pUncompSize, const u8 *src, u32 maxCompLen, s32 maxUncompSize) {
s32 read_amount = 0;
while (*pHeaderLen != 0) {
(*pHeaderLen)--;
if (*pHeaderLen == 0xF) {
if (*src != (u8)'Y') {
return -1;
}
} else if (*pHeaderLen == 0xE) {
if (*src != (u8)'a') {
return -1;
}
} else if (*pHeaderLen == 0xD) {
if (*src != (u8)'z') {
return -1;
}
} else if (*pHeaderLen == 0xC) {
if (*src != (u8)'0') {
return -1;
}
} else if (*pHeaderLen >= 0x8) {
*pUncompSize |= *src << ((*pHeaderLen - 8) << 3);
}
maxCompLen--;
src++;
read_amount++;
if (maxCompLen == 0 && *pHeaderLen != 0) {
return read_amount;
}
}
if (maxUncompSize > 0 && maxUncompSize < *pUncompSize) {
*pUncompSize = maxUncompSize;
}
return read_amount;
}
s32 UncompContextSZS::readUncomp(const void *pSrca, u32 len) {
const u8 *pSrc = static_cast<const u8 *>(pSrca);
if (mHeaderLen != 0) {
s32 read_len = readHeader(&mHeaderLen, &mUncompSize, pSrc, len, mMaxUncompSize);
pSrc += read_len;
len -= read_len;
if (len == 0) {
if (mHeaderLen == 0) {
return mUncompSize;
}
return CX_READ_ERR_1;
}
}
while (mUncompSize > 0) {
if (mState == 2) {
u32 num_bytes = *pSrc++ + 0x12;
len--;
if (num_bytes > mUncompSize) {
if (mMaxUncompSize == 0) {
return CX_READ_ERR_4;
}
num_bytes = (u16)mUncompSize;
}
mUncompSize -= num_bytes;
do {
*mpDest = *(mpDest - mCopySrc);
mpDest++;
} while (--num_bytes);
mState = 0;
} else if (mState == 1) {
len--;
u32 b1 = (mFirstByte << 8) | *pSrc++;
u32 num_bytes = b1 >> 12;
mCopySrc = (b1 & 0xFFF) + 1;
if (num_bytes == 0) {
mState = 2;
} else {
num_bytes += 2;
if (num_bytes > mUncompSize) {
if (mMaxUncompSize == 0) {
return CX_READ_ERR_4;
}
num_bytes = (u16)mUncompSize;
}
mUncompSize -= num_bytes;
do {
*mpDest = *(mpDest - mCopySrc);
mpDest++;
} while (--num_bytes);
mState = 0;
}
} else {
if (mGroupHead == 0) {
len--;
mSecondByte = *pSrc++;
mGroupHead = 0x80;
if (len == 0) {
break;
}
}
if (mSecondByte & mGroupHead) {
*mpDest++ = *pSrc++;
mUncompSize--;
} else {
mFirstByte = *pSrc++;
mState = 1;
}
len--;
mGroupHead >>= 1;
}
if (len == 0) {
break;
}
}
if (mUncompSize == 0 && mMaxUncompSize == 0 && len > 0x20) {
return CX_READ_ERR_3;
}
return mUncompSize;
}
bool StreamDecompSZS::init(void *pDest, u32 maxCompressedSize) {
mpDest = pDest;
mMaxCompressedSize = maxCompressedSize;
mContext.initUncompContext(pDest);
return true;
}
bool StreamDecompSZS::decomp(const void *pSrc, u32 len) {
return mContext.readUncomp((const u8 *)pSrc, len) == CX_READ_OK;
}
} // namespace EGG
|
