| … | |
… | |
| 111 | u8 *op = (u8 *)out_data; |
111 | u8 *op = (u8 *)out_data; |
| 112 | const u8 *in_end = ip + in_len; |
112 | const u8 *in_end = ip + in_len; |
| 113 | u8 *out_end = op + out_len; |
113 | u8 *out_end = op + out_len; |
| 114 | const u8 *ref; |
114 | const u8 *ref; |
| 115 | |
115 | |
|
|
116 | /* off requires a type wide enough to hold a general pointer difference. |
|
|
117 | * ISO C doesn't have that (size_t might not be enough and ptrdiff_t only |
|
|
118 | * works for differences within a single object). We also assume that no |
|
|
119 | * no bit pattern traps. Since the only platform that is both non-POSIX |
|
|
120 | * and fails to support both assumptions is windows 64 bit, we make a |
|
|
121 | * special workaround for it. |
|
|
122 | */ |
|
|
123 | #if defined (WIN32) && defined (_M_X64) |
|
|
124 | unsigned _int64 off; /* workaround for missing POSIX compliance */ |
|
|
125 | #else |
|
|
126 | unsigned long off; |
|
|
127 | #endif |
| 116 | unsigned int hval; |
128 | unsigned int hval; |
| 117 | unsigned long off; |
|
|
| 118 | int lit; |
129 | int lit; |
| 119 | |
130 | |
| 120 | if (!in_len || !out_len) |
131 | if (!in_len || !out_len) |
| 121 | return 0; |
132 | return 0; |
| 122 | |
133 | |
| … | |
… | |
| 254 | lit = 0; op++; /* start run */ |
265 | lit = 0; op++; /* start run */ |
| 255 | } |
266 | } |
| 256 | } |
267 | } |
| 257 | } |
268 | } |
| 258 | |
269 | |
| 259 | if (op + 2 > out_end) /* at most 2 bytes can be missing here */ |
270 | if (op + 3 > out_end) /* at most 3 bytes can be missing here */ |
| 260 | return 0; |
271 | return 0; |
| 261 | |
272 | |
| 262 | while (ip < in_end) |
273 | while (ip < in_end) |
| 263 | { |
274 | { |
| 264 | lit++; *op++ = *ip++; |
275 | lit++; *op++ = *ip++; |
|
|
276 | |
|
|
277 | if (expect_false (lit == MAX_LIT)) |
|
|
278 | { |
|
|
279 | op [- lit - 1] = lit - 1; /* stop run */ |
|
|
280 | lit = 0; op++; /* start run */ |
|
|
281 | } |
| 265 | } |
282 | } |
| 266 | |
283 | |
| 267 | op [- lit - 1] = lit - 1; /* end run */ |
284 | op [- lit - 1] = lit - 1; /* end run */ |
| 268 | op -= !lit; /* undo run if length is zero */ |
285 | op -= !lit; /* undo run if length is zero */ |
| 269 | |
286 | |
