diff options
Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/zlib/inffast.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/zlib/inffast.c | 680 |
1 files changed, 340 insertions, 340 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/zlib/inffast.c b/libraries/irrlicht-1.8/source/Irrlicht/zlib/inffast.c index 2dfd412..2f1d60b 100644 --- a/libraries/irrlicht-1.8/source/Irrlicht/zlib/inffast.c +++ b/libraries/irrlicht-1.8/source/Irrlicht/zlib/inffast.c | |||
@@ -1,340 +1,340 @@ | |||
1 | /* inffast.c -- fast decoding | 1 | /* inffast.c -- fast decoding |
2 | * Copyright (C) 1995-2008, 2010 Mark Adler | 2 | * Copyright (C) 1995-2008, 2010 Mark Adler |
3 | * For conditions of distribution and use, see copyright notice in zlib.h | 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
4 | */ | 4 | */ |
5 | 5 | ||
6 | #include "zutil.h" | 6 | #include "zutil.h" |
7 | #include "inftrees.h" | 7 | #include "inftrees.h" |
8 | #include "inflate.h" | 8 | #include "inflate.h" |
9 | #include "inffast.h" | 9 | #include "inffast.h" |
10 | 10 | ||
11 | #ifndef ASMINF | 11 | #ifndef ASMINF |
12 | 12 | ||
13 | /* Allow machine dependent optimization for post-increment or pre-increment. | 13 | /* Allow machine dependent optimization for post-increment or pre-increment. |
14 | Based on testing to date, | 14 | Based on testing to date, |
15 | Pre-increment preferred for: | 15 | Pre-increment preferred for: |
16 | - PowerPC G3 (Adler) | 16 | - PowerPC G3 (Adler) |
17 | - MIPS R5000 (Randers-Pehrson) | 17 | - MIPS R5000 (Randers-Pehrson) |
18 | Post-increment preferred for: | 18 | Post-increment preferred for: |
19 | - none | 19 | - none |
20 | No measurable difference: | 20 | No measurable difference: |
21 | - Pentium III (Anderson) | 21 | - Pentium III (Anderson) |
22 | - M68060 (Nikl) | 22 | - M68060 (Nikl) |
23 | */ | 23 | */ |
24 | #ifdef POSTINC | 24 | #ifdef POSTINC |
25 | # define OFF 0 | 25 | # define OFF 0 |
26 | # define PUP(a) *(a)++ | 26 | # define PUP(a) *(a)++ |
27 | #else | 27 | #else |
28 | # define OFF 1 | 28 | # define OFF 1 |
29 | # define PUP(a) *++(a) | 29 | # define PUP(a) *++(a) |
30 | #endif | 30 | #endif |
31 | 31 | ||
32 | /* | 32 | /* |
33 | Decode literal, length, and distance codes and write out the resulting | 33 | Decode literal, length, and distance codes and write out the resulting |
34 | literal and match bytes until either not enough input or output is | 34 | literal and match bytes until either not enough input or output is |
35 | available, an end-of-block is encountered, or a data error is encountered. | 35 | available, an end-of-block is encountered, or a data error is encountered. |
36 | When large enough input and output buffers are supplied to inflate(), for | 36 | When large enough input and output buffers are supplied to inflate(), for |
37 | example, a 16K input buffer and a 64K output buffer, more than 95% of the | 37 | example, a 16K input buffer and a 64K output buffer, more than 95% of the |
38 | inflate execution time is spent in this routine. | 38 | inflate execution time is spent in this routine. |
39 | 39 | ||
40 | Entry assumptions: | 40 | Entry assumptions: |
41 | 41 | ||
42 | state->mode == LEN | 42 | state->mode == LEN |
43 | strm->avail_in >= 6 | 43 | strm->avail_in >= 6 |
44 | strm->avail_out >= 258 | 44 | strm->avail_out >= 258 |
45 | start >= strm->avail_out | 45 | start >= strm->avail_out |
46 | state->bits < 8 | 46 | state->bits < 8 |
47 | 47 | ||
48 | On return, state->mode is one of: | 48 | On return, state->mode is one of: |
49 | 49 | ||
50 | LEN -- ran out of enough output space or enough available input | 50 | LEN -- ran out of enough output space or enough available input |
51 | TYPE -- reached end of block code, inflate() to interpret next block | 51 | TYPE -- reached end of block code, inflate() to interpret next block |
52 | BAD -- error in block data | 52 | BAD -- error in block data |
53 | 53 | ||
54 | Notes: | 54 | Notes: |
55 | 55 | ||
56 | - The maximum input bits used by a length/distance pair is 15 bits for the | 56 | - The maximum input bits used by a length/distance pair is 15 bits for the |
57 | length code, 5 bits for the length extra, 15 bits for the distance code, | 57 | length code, 5 bits for the length extra, 15 bits for the distance code, |
58 | and 13 bits for the distance extra. This totals 48 bits, or six bytes. | 58 | and 13 bits for the distance extra. This totals 48 bits, or six bytes. |
59 | Therefore if strm->avail_in >= 6, then there is enough input to avoid | 59 | Therefore if strm->avail_in >= 6, then there is enough input to avoid |
60 | checking for available input while decoding. | 60 | checking for available input while decoding. |
61 | 61 | ||
62 | - The maximum bytes that a single length/distance pair can output is 258 | 62 | - The maximum bytes that a single length/distance pair can output is 258 |
63 | bytes, which is the maximum length that can be coded. inflate_fast() | 63 | bytes, which is the maximum length that can be coded. inflate_fast() |
64 | requires strm->avail_out >= 258 for each loop to avoid checking for | 64 | requires strm->avail_out >= 258 for each loop to avoid checking for |
65 | output space. | 65 | output space. |
66 | */ | 66 | */ |
67 | void ZLIB_INTERNAL inflate_fast(strm, start) | 67 | void ZLIB_INTERNAL inflate_fast(strm, start) |
68 | z_streamp strm; | 68 | z_streamp strm; |
69 | unsigned start; /* inflate()'s starting value for strm->avail_out */ | 69 | unsigned start; /* inflate()'s starting value for strm->avail_out */ |
70 | { | 70 | { |
71 | struct inflate_state FAR *state; | 71 | struct inflate_state FAR *state; |
72 | unsigned char FAR *in; /* local strm->next_in */ | 72 | unsigned char FAR *in; /* local strm->next_in */ |
73 | unsigned char FAR *last; /* while in < last, enough input available */ | 73 | unsigned char FAR *last; /* while in < last, enough input available */ |
74 | unsigned char FAR *out; /* local strm->next_out */ | 74 | unsigned char FAR *out; /* local strm->next_out */ |
75 | unsigned char FAR *beg; /* inflate()'s initial strm->next_out */ | 75 | unsigned char FAR *beg; /* inflate()'s initial strm->next_out */ |
76 | unsigned char FAR *end; /* while out < end, enough space available */ | 76 | unsigned char FAR *end; /* while out < end, enough space available */ |
77 | #ifdef INFLATE_STRICT | 77 | #ifdef INFLATE_STRICT |
78 | unsigned dmax; /* maximum distance from zlib header */ | 78 | unsigned dmax; /* maximum distance from zlib header */ |
79 | #endif | 79 | #endif |
80 | unsigned wsize; /* window size or zero if not using window */ | 80 | unsigned wsize; /* window size or zero if not using window */ |
81 | unsigned whave; /* valid bytes in the window */ | 81 | unsigned whave; /* valid bytes in the window */ |
82 | unsigned wnext; /* window write index */ | 82 | unsigned wnext; /* window write index */ |
83 | unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */ | 83 | unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */ |
84 | unsigned long hold; /* local strm->hold */ | 84 | unsigned long hold; /* local strm->hold */ |
85 | unsigned bits; /* local strm->bits */ | 85 | unsigned bits; /* local strm->bits */ |
86 | code const FAR *lcode; /* local strm->lencode */ | 86 | code const FAR *lcode; /* local strm->lencode */ |
87 | code const FAR *dcode; /* local strm->distcode */ | 87 | code const FAR *dcode; /* local strm->distcode */ |
88 | unsigned lmask; /* mask for first level of length codes */ | 88 | unsigned lmask; /* mask for first level of length codes */ |
89 | unsigned dmask; /* mask for first level of distance codes */ | 89 | unsigned dmask; /* mask for first level of distance codes */ |
90 | code here; /* retrieved table entry */ | 90 | code here; /* retrieved table entry */ |
91 | unsigned op; /* code bits, operation, extra bits, or */ | 91 | unsigned op; /* code bits, operation, extra bits, or */ |
92 | /* window position, window bytes to copy */ | 92 | /* window position, window bytes to copy */ |
93 | unsigned len; /* match length, unused bytes */ | 93 | unsigned len; /* match length, unused bytes */ |
94 | unsigned dist; /* match distance */ | 94 | unsigned dist; /* match distance */ |
95 | unsigned char FAR *from; /* where to copy match from */ | 95 | unsigned char FAR *from; /* where to copy match from */ |
96 | 96 | ||
97 | /* copy state to local variables */ | 97 | /* copy state to local variables */ |
98 | state = (struct inflate_state FAR *)strm->state; | 98 | state = (struct inflate_state FAR *)strm->state; |
99 | in = strm->next_in - OFF; | 99 | in = strm->next_in - OFF; |
100 | last = in + (strm->avail_in - 5); | 100 | last = in + (strm->avail_in - 5); |
101 | out = strm->next_out - OFF; | 101 | out = strm->next_out - OFF; |
102 | beg = out - (start - strm->avail_out); | 102 | beg = out - (start - strm->avail_out); |
103 | end = out + (strm->avail_out - 257); | 103 | end = out + (strm->avail_out - 257); |
104 | #ifdef INFLATE_STRICT | 104 | #ifdef INFLATE_STRICT |
105 | dmax = state->dmax; | 105 | dmax = state->dmax; |
106 | #endif | 106 | #endif |
107 | wsize = state->wsize; | 107 | wsize = state->wsize; |
108 | whave = state->whave; | 108 | whave = state->whave; |
109 | wnext = state->wnext; | 109 | wnext = state->wnext; |
110 | window = state->window; | 110 | window = state->window; |
111 | hold = state->hold; | 111 | hold = state->hold; |
112 | bits = state->bits; | 112 | bits = state->bits; |
113 | lcode = state->lencode; | 113 | lcode = state->lencode; |
114 | dcode = state->distcode; | 114 | dcode = state->distcode; |
115 | lmask = (1U << state->lenbits) - 1; | 115 | lmask = (1U << state->lenbits) - 1; |
116 | dmask = (1U << state->distbits) - 1; | 116 | dmask = (1U << state->distbits) - 1; |
117 | 117 | ||
118 | /* decode literals and length/distances until end-of-block or not enough | 118 | /* decode literals and length/distances until end-of-block or not enough |
119 | input data or output space */ | 119 | input data or output space */ |
120 | do { | 120 | do { |
121 | if (bits < 15) { | 121 | if (bits < 15) { |
122 | hold += (unsigned long)(PUP(in)) << bits; | 122 | hold += (unsigned long)(PUP(in)) << bits; |
123 | bits += 8; | 123 | bits += 8; |
124 | hold += (unsigned long)(PUP(in)) << bits; | 124 | hold += (unsigned long)(PUP(in)) << bits; |
125 | bits += 8; | 125 | bits += 8; |
126 | } | 126 | } |
127 | here = lcode[hold & lmask]; | 127 | here = lcode[hold & lmask]; |
128 | dolen: | 128 | dolen: |
129 | op = (unsigned)(here.bits); | 129 | op = (unsigned)(here.bits); |
130 | hold >>= op; | 130 | hold >>= op; |
131 | bits -= op; | 131 | bits -= op; |
132 | op = (unsigned)(here.op); | 132 | op = (unsigned)(here.op); |
133 | if (op == 0) { /* literal */ | 133 | if (op == 0) { /* literal */ |
134 | Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ? | 134 | Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ? |
135 | "inflate: literal '%c'\n" : | 135 | "inflate: literal '%c'\n" : |
136 | "inflate: literal 0x%02x\n", here.val)); | 136 | "inflate: literal 0x%02x\n", here.val)); |
137 | PUP(out) = (unsigned char)(here.val); | 137 | PUP(out) = (unsigned char)(here.val); |
138 | } | 138 | } |
139 | else if (op & 16) { /* length base */ | 139 | else if (op & 16) { /* length base */ |
140 | len = (unsigned)(here.val); | 140 | len = (unsigned)(here.val); |
141 | op &= 15; /* number of extra bits */ | 141 | op &= 15; /* number of extra bits */ |
142 | if (op) { | 142 | if (op) { |
143 | if (bits < op) { | 143 | if (bits < op) { |
144 | hold += (unsigned long)(PUP(in)) << bits; | 144 | hold += (unsigned long)(PUP(in)) << bits; |
145 | bits += 8; | 145 | bits += 8; |
146 | } | 146 | } |
147 | len += (unsigned)hold & ((1U << op) - 1); | 147 | len += (unsigned)hold & ((1U << op) - 1); |
148 | hold >>= op; | 148 | hold >>= op; |
149 | bits -= op; | 149 | bits -= op; |
150 | } | 150 | } |
151 | Tracevv((stderr, "inflate: length %u\n", len)); | 151 | Tracevv((stderr, "inflate: length %u\n", len)); |
152 | if (bits < 15) { | 152 | if (bits < 15) { |
153 | hold += (unsigned long)(PUP(in)) << bits; | 153 | hold += (unsigned long)(PUP(in)) << bits; |
154 | bits += 8; | 154 | bits += 8; |
155 | hold += (unsigned long)(PUP(in)) << bits; | 155 | hold += (unsigned long)(PUP(in)) << bits; |
156 | bits += 8; | 156 | bits += 8; |
157 | } | 157 | } |
158 | here = dcode[hold & dmask]; | 158 | here = dcode[hold & dmask]; |
159 | dodist: | 159 | dodist: |
160 | op = (unsigned)(here.bits); | 160 | op = (unsigned)(here.bits); |
161 | hold >>= op; | 161 | hold >>= op; |
162 | bits -= op; | 162 | bits -= op; |
163 | op = (unsigned)(here.op); | 163 | op = (unsigned)(here.op); |
164 | if (op & 16) { /* distance base */ | 164 | if (op & 16) { /* distance base */ |
165 | dist = (unsigned)(here.val); | 165 | dist = (unsigned)(here.val); |
166 | op &= 15; /* number of extra bits */ | 166 | op &= 15; /* number of extra bits */ |
167 | if (bits < op) { | 167 | if (bits < op) { |
168 | hold += (unsigned long)(PUP(in)) << bits; | 168 | hold += (unsigned long)(PUP(in)) << bits; |
169 | bits += 8; | 169 | bits += 8; |
170 | if (bits < op) { | 170 | if (bits < op) { |
171 | hold += (unsigned long)(PUP(in)) << bits; | 171 | hold += (unsigned long)(PUP(in)) << bits; |
172 | bits += 8; | 172 | bits += 8; |
173 | } | 173 | } |
174 | } | 174 | } |
175 | dist += (unsigned)hold & ((1U << op) - 1); | 175 | dist += (unsigned)hold & ((1U << op) - 1); |
176 | #ifdef INFLATE_STRICT | 176 | #ifdef INFLATE_STRICT |
177 | if (dist > dmax) { | 177 | if (dist > dmax) { |
178 | strm->msg = (char *)"invalid distance too far back"; | 178 | strm->msg = (char *)"invalid distance too far back"; |
179 | state->mode = BAD; | 179 | state->mode = BAD; |
180 | break; | 180 | break; |
181 | } | 181 | } |
182 | #endif | 182 | #endif |
183 | hold >>= op; | 183 | hold >>= op; |
184 | bits -= op; | 184 | bits -= op; |
185 | Tracevv((stderr, "inflate: distance %u\n", dist)); | 185 | Tracevv((stderr, "inflate: distance %u\n", dist)); |
186 | op = (unsigned)(out - beg); /* max distance in output */ | 186 | op = (unsigned)(out - beg); /* max distance in output */ |
187 | if (dist > op) { /* see if copy from window */ | 187 | if (dist > op) { /* see if copy from window */ |
188 | op = dist - op; /* distance back in window */ | 188 | op = dist - op; /* distance back in window */ |
189 | if (op > whave) { | 189 | if (op > whave) { |
190 | if (state->sane) { | 190 | if (state->sane) { |
191 | strm->msg = | 191 | strm->msg = |
192 | (char *)"invalid distance too far back"; | 192 | (char *)"invalid distance too far back"; |
193 | state->mode = BAD; | 193 | state->mode = BAD; |
194 | break; | 194 | break; |
195 | } | 195 | } |
196 | #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR | 196 | #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR |
197 | if (len <= op - whave) { | 197 | if (len <= op - whave) { |
198 | do { | 198 | do { |
199 | PUP(out) = 0; | 199 | PUP(out) = 0; |
200 | } while (--len); | 200 | } while (--len); |
201 | continue; | 201 | continue; |
202 | } | 202 | } |
203 | len -= op - whave; | 203 | len -= op - whave; |
204 | do { | 204 | do { |
205 | PUP(out) = 0; | 205 | PUP(out) = 0; |
206 | } while (--op > whave); | 206 | } while (--op > whave); |
207 | if (op == 0) { | 207 | if (op == 0) { |
208 | from = out - dist; | 208 | from = out - dist; |
209 | do { | 209 | do { |
210 | PUP(out) = PUP(from); | 210 | PUP(out) = PUP(from); |
211 | } while (--len); | 211 | } while (--len); |
212 | continue; | 212 | continue; |
213 | } | 213 | } |
214 | #endif | 214 | #endif |
215 | } | 215 | } |
216 | from = window - OFF; | 216 | from = window - OFF; |
217 | if (wnext == 0) { /* very common case */ | 217 | if (wnext == 0) { /* very common case */ |
218 | from += wsize - op; | 218 | from += wsize - op; |
219 | if (op < len) { /* some from window */ | 219 | if (op < len) { /* some from window */ |
220 | len -= op; | 220 | len -= op; |
221 | do { | 221 | do { |
222 | PUP(out) = PUP(from); | 222 | PUP(out) = PUP(from); |
223 | } while (--op); | 223 | } while (--op); |
224 | from = out - dist; /* rest from output */ | 224 | from = out - dist; /* rest from output */ |
225 | } | 225 | } |
226 | } | 226 | } |
227 | else if (wnext < op) { /* wrap around window */ | 227 | else if (wnext < op) { /* wrap around window */ |
228 | from += wsize + wnext - op; | 228 | from += wsize + wnext - op; |
229 | op -= wnext; | 229 | op -= wnext; |
230 | if (op < len) { /* some from end of window */ | 230 | if (op < len) { /* some from end of window */ |
231 | len -= op; | 231 | len -= op; |
232 | do { | 232 | do { |
233 | PUP(out) = PUP(from); | 233 | PUP(out) = PUP(from); |
234 | } while (--op); | 234 | } while (--op); |
235 | from = window - OFF; | 235 | from = window - OFF; |
236 | if (wnext < len) { /* some from start of window */ | 236 | if (wnext < len) { /* some from start of window */ |
237 | op = wnext; | 237 | op = wnext; |
238 | len -= op; | 238 | len -= op; |
239 | do { | 239 | do { |
240 | PUP(out) = PUP(from); | 240 | PUP(out) = PUP(from); |
241 | } while (--op); | 241 | } while (--op); |
242 | from = out - dist; /* rest from output */ | 242 | from = out - dist; /* rest from output */ |
243 | } | 243 | } |
244 | } | 244 | } |
245 | } | 245 | } |
246 | else { /* contiguous in window */ | 246 | else { /* contiguous in window */ |
247 | from += wnext - op; | 247 | from += wnext - op; |
248 | if (op < len) { /* some from window */ | 248 | if (op < len) { /* some from window */ |
249 | len -= op; | 249 | len -= op; |
250 | do { | 250 | do { |
251 | PUP(out) = PUP(from); | 251 | PUP(out) = PUP(from); |
252 | } while (--op); | 252 | } while (--op); |
253 | from = out - dist; /* rest from output */ | 253 | from = out - dist; /* rest from output */ |
254 | } | 254 | } |
255 | } | 255 | } |
256 | while (len > 2) { | 256 | while (len > 2) { |
257 | PUP(out) = PUP(from); | 257 | PUP(out) = PUP(from); |
258 | PUP(out) = PUP(from); | 258 | PUP(out) = PUP(from); |
259 | PUP(out) = PUP(from); | 259 | PUP(out) = PUP(from); |
260 | len -= 3; | 260 | len -= 3; |
261 | } | 261 | } |
262 | if (len) { | 262 | if (len) { |
263 | PUP(out) = PUP(from); | 263 | PUP(out) = PUP(from); |
264 | if (len > 1) | 264 | if (len > 1) |
265 | PUP(out) = PUP(from); | 265 | PUP(out) = PUP(from); |
266 | } | 266 | } |
267 | } | 267 | } |
268 | else { | 268 | else { |
269 | from = out - dist; /* copy direct from output */ | 269 | from = out - dist; /* copy direct from output */ |
270 | do { /* minimum length is three */ | 270 | do { /* minimum length is three */ |
271 | PUP(out) = PUP(from); | 271 | PUP(out) = PUP(from); |
272 | PUP(out) = PUP(from); | 272 | PUP(out) = PUP(from); |
273 | PUP(out) = PUP(from); | 273 | PUP(out) = PUP(from); |
274 | len -= 3; | 274 | len -= 3; |
275 | } while (len > 2); | 275 | } while (len > 2); |
276 | if (len) { | 276 | if (len) { |
277 | PUP(out) = PUP(from); | 277 | PUP(out) = PUP(from); |
278 | if (len > 1) | 278 | if (len > 1) |
279 | PUP(out) = PUP(from); | 279 | PUP(out) = PUP(from); |
280 | } | 280 | } |
281 | } | 281 | } |
282 | } | 282 | } |
283 | else if ((op & 64) == 0) { /* 2nd level distance code */ | 283 | else if ((op & 64) == 0) { /* 2nd level distance code */ |
284 | here = dcode[here.val + (hold & ((1U << op) - 1))]; | 284 | here = dcode[here.val + (hold & ((1U << op) - 1))]; |
285 | goto dodist; | 285 | goto dodist; |
286 | } | 286 | } |
287 | else { | 287 | else { |
288 | strm->msg = (char *)"invalid distance code"; | 288 | strm->msg = (char *)"invalid distance code"; |
289 | state->mode = BAD; | 289 | state->mode = BAD; |
290 | break; | 290 | break; |
291 | } | 291 | } |
292 | } | 292 | } |
293 | else if ((op & 64) == 0) { /* 2nd level length code */ | 293 | else if ((op & 64) == 0) { /* 2nd level length code */ |
294 | here = lcode[here.val + (hold & ((1U << op) - 1))]; | 294 | here = lcode[here.val + (hold & ((1U << op) - 1))]; |
295 | goto dolen; | 295 | goto dolen; |
296 | } | 296 | } |
297 | else if (op & 32) { /* end-of-block */ | 297 | else if (op & 32) { /* end-of-block */ |
298 | Tracevv((stderr, "inflate: end of block\n")); | 298 | Tracevv((stderr, "inflate: end of block\n")); |
299 | state->mode = TYPE; | 299 | state->mode = TYPE; |
300 | break; | 300 | break; |
301 | } | 301 | } |
302 | else { | 302 | else { |
303 | strm->msg = (char *)"invalid literal/length code"; | 303 | strm->msg = (char *)"invalid literal/length code"; |
304 | state->mode = BAD; | 304 | state->mode = BAD; |
305 | break; | 305 | break; |
306 | } | 306 | } |
307 | } while (in < last && out < end); | 307 | } while (in < last && out < end); |
308 | 308 | ||
309 | /* return unused bytes (on entry, bits < 8, so in won't go too far back) */ | 309 | /* return unused bytes (on entry, bits < 8, so in won't go too far back) */ |
310 | len = bits >> 3; | 310 | len = bits >> 3; |
311 | in -= len; | 311 | in -= len; |
312 | bits -= len << 3; | 312 | bits -= len << 3; |
313 | hold &= (1U << bits) - 1; | 313 | hold &= (1U << bits) - 1; |
314 | 314 | ||
315 | /* update state and return */ | 315 | /* update state and return */ |
316 | strm->next_in = in + OFF; | 316 | strm->next_in = in + OFF; |
317 | strm->next_out = out + OFF; | 317 | strm->next_out = out + OFF; |
318 | strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last)); | 318 | strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last)); |
319 | strm->avail_out = (unsigned)(out < end ? | 319 | strm->avail_out = (unsigned)(out < end ? |
320 | 257 + (end - out) : 257 - (out - end)); | 320 | 257 + (end - out) : 257 - (out - end)); |
321 | state->hold = hold; | 321 | state->hold = hold; |
322 | state->bits = bits; | 322 | state->bits = bits; |
323 | return; | 323 | return; |
324 | } | 324 | } |
325 | 325 | ||
326 | /* | 326 | /* |
327 | inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe): | 327 | inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe): |
328 | - Using bit fields for code structure | 328 | - Using bit fields for code structure |
329 | - Different op definition to avoid & for extra bits (do & for table bits) | 329 | - Different op definition to avoid & for extra bits (do & for table bits) |
330 | - Three separate decoding do-loops for direct, window, and wnext == 0 | 330 | - Three separate decoding do-loops for direct, window, and wnext == 0 |
331 | - Special case for distance > 1 copies to do overlapped load and store copy | 331 | - Special case for distance > 1 copies to do overlapped load and store copy |
332 | - Explicit branch predictions (based on measured branch probabilities) | 332 | - Explicit branch predictions (based on measured branch probabilities) |
333 | - Deferring match copy and interspersed it with decoding subsequent codes | 333 | - Deferring match copy and interspersed it with decoding subsequent codes |
334 | - Swapping literal/length else | 334 | - Swapping literal/length else |
335 | - Swapping window/direct else | 335 | - Swapping window/direct else |
336 | - Larger unrolled copy loops (three is about right) | 336 | - Larger unrolled copy loops (three is about right) |
337 | - Moving len -= 3 statement into middle of loop | 337 | - Moving len -= 3 statement into middle of loop |
338 | */ | 338 | */ |
339 | 339 | ||
340 | #endif /* !ASMINF */ | 340 | #endif /* !ASMINF */ |