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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
/*
* LZ4 - Fast LZ compression algorithm
* Header File
* Copyright (C) 2011-2013, Yann Collet.
* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You can contact the author at :
* - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
* - LZ4 source repository : http://code.google.com/p/lz4/
*/
#include <grub/err.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/types.h>
static int LZ4_uncompress_unknownOutputSize(const char *source, char *dest,
int isize, int maxOutputSize);
/*
* CPU Feature Detection
*/
/* 32 or 64 bits ? */
#if (GRUB_CPU_SIZEOF_VOID_P == 8)
#define LZ4_ARCH64 1
#else
#define LZ4_ARCH64 0
#endif
/*
* Compiler Options
*/
#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
#if (GCC_VERSION >= 302) || (defined (__INTEL_COMPILER) && __INTEL_COMPILER >= 800) || defined(__clang__)
#define expect(expr, value) (__builtin_expect((expr), (value)))
#else
#define expect(expr, value) (expr)
#endif
#define likely(expr) expect((expr) != 0, 1)
#define unlikely(expr) expect((expr) != 0, 0)
/* Basic types */
#define BYTE grub_uint8_t
#define U16 grub_uint16_t
#define U32 grub_uint32_t
#define S32 grub_int32_t
#define U64 grub_uint64_t
typedef struct _U16_S {
U16 v;
} GRUB_PACKED U16_S;
typedef struct _U32_S {
U32 v;
} GRUB_PACKED U32_S;
typedef struct _U64_S {
U64 v;
} GRUB_PACKED U64_S;
#define A64(x) (((U64_S *)(x))->v)
#define A32(x) (((U32_S *)(x))->v)
#define A16(x) (((U16_S *)(x))->v)
/*
* Constants
*/
#define MINMATCH 4
#define COPYLENGTH 8
#define LASTLITERALS 5
#define ML_BITS 4
#define ML_MASK ((1U<<ML_BITS)-1)
#define RUN_BITS (8-ML_BITS)
#define RUN_MASK ((1U<<RUN_BITS)-1)
/*
* Architecture-specific macros
*/
#if LZ4_ARCH64
#define STEPSIZE 8
#define UARCH U64
#define AARCH A64
#define LZ4_COPYSTEP(s, d) A64(d) = A64(s); d += 8; s += 8;
#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
#define LZ4_SECURECOPY(s, d, e) if (d < e) LZ4_WILDCOPY(s, d, e)
#define HTYPE U32
#define INITBASE(base) const BYTE* const base = ip
#else
#define STEPSIZE 4
#define UARCH U32
#define AARCH A32
#define LZ4_COPYSTEP(s, d) A32(d) = A32(s); d += 4; s += 4;
#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d); LZ4_COPYSTEP(s, d);
#define LZ4_SECURECOPY LZ4_WILDCOPY
#define HTYPE const BYTE*
#define INITBASE(base) const int base = 0
#endif
#define LZ4_READ_LITTLEENDIAN_16(d, s, p) { d = (s) - grub_le_to_cpu16 (A16 (p)); }
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) { A16(p) = grub_cpu_to_le16 (v); p += 2; }
/* Macros */
#define LZ4_WILDCOPY(s, d, e) do { LZ4_COPYPACKET(s, d) } while (d < e);
/* Decompression functions */
grub_err_t
lz4_decompress(void *s_start, void *d_start, grub_size_t s_len, grub_size_t d_len);
grub_err_t
lz4_decompress(void *s_start, void *d_start, grub_size_t s_len, grub_size_t d_len)
{
const BYTE *src = s_start;
U32 bufsiz = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) |
src[3];
/* invalid compressed buffer size encoded at start */
if (bufsiz + 4 > s_len)
return grub_error(GRUB_ERR_BAD_FS,"lz4 decompression failed.");
/*
* Returns 0 on success (decompression function returned non-negative)
* and appropriate error on failure (decompression function returned negative).
*/
return (LZ4_uncompress_unknownOutputSize((char*)s_start + 4, d_start, bufsiz,
d_len) < 0)?grub_error(GRUB_ERR_BAD_FS,"lz4 decompression failed."):0;
}
static int
LZ4_uncompress_unknownOutputSize(const char *source,
char *dest, int isize, int maxOutputSize)
{
/* Local Variables */
const BYTE * ip = (const BYTE *) source;
const BYTE *const iend = ip + isize;
const BYTE * ref;
BYTE * op = (BYTE *) dest;
BYTE *const oend = op + maxOutputSize;
BYTE *cpy;
grub_size_t dec[] = { 0, 3, 2, 3, 0, 0, 0, 0 };
/* Main Loop */
while (ip < iend) {
BYTE token;
int length;
/* get runlength */
token = *ip++;
if ((length = (token >> ML_BITS)) == RUN_MASK) {
int s = 255;
while ((ip < iend) && (s == 255)) {
s = *ip++;
length += s;
}
}
/* copy literals */
if ((grub_addr_t) length > ~(grub_addr_t)op)
goto _output_error;
cpy = op + length;
if ((cpy > oend - COPYLENGTH) ||
(ip + length > iend - COPYLENGTH)) {
if (cpy > oend)
/*
* Error: request to write beyond destination
* buffer.
*/
goto _output_error;
if (ip + length > iend)
/*
* Error : request to read beyond source
* buffer.
*/
goto _output_error;
grub_memcpy(op, ip, length);
op += length;
ip += length;
if (ip < iend)
/* Error : LZ4 format violation */
goto _output_error;
/* Necessarily EOF, due to parsing restrictions. */
break;
}
LZ4_WILDCOPY(ip, op, cpy);
ip -= (op - cpy);
op = cpy;
/* get offset */
LZ4_READ_LITTLEENDIAN_16(ref, cpy, ip);
ip += 2;
if (ref < (BYTE * const) dest)
/*
* Error: offset creates reference outside of
* destination buffer.
*/
goto _output_error;
/* get matchlength */
if ((length = (token & ML_MASK)) == ML_MASK) {
while (ip < iend) {
int s = *ip++;
length += s;
if (s == 255)
continue;
break;
}
}
/* copy repeated sequence */
if unlikely(op - ref < STEPSIZE) {
#if LZ4_ARCH64
grub_size_t dec2table[] = { 0, 0, 0, -1, 0, 1, 2, 3 };
grub_size_t dec2 = dec2table[op - ref];
#else
const int dec2 = 0;
#endif
*op++ = *ref++;
*op++ = *ref++;
*op++ = *ref++;
*op++ = *ref++;
ref -= dec[op - ref];
A32(op) = A32(ref);
op += STEPSIZE - 4;
ref -= dec2;
} else {
LZ4_COPYSTEP(ref, op);
}
cpy = op + length - (STEPSIZE - 4);
if (cpy > oend - COPYLENGTH) {
if (cpy > oend)
/*
* Error: request to write outside of
* destination buffer.
*/
goto _output_error;
LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH));
while (op < cpy)
*op++ = *ref++;
op = cpy;
if (op == oend)
/*
* Check EOF (should never happen, since last
* 5 bytes are supposed to be literals).
*/
break;
continue;
}
LZ4_SECURECOPY(ref, op, cpy);
op = cpy; /* correction */
}
/* end of decoding */
return (int)(((char *)op) - dest);
/* write overflow error detected */
_output_error:
return (int)(-(((char *)ip) - source));
}
|
