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authorMark Adler <madler@alumni.caltech.edu>2011-09-09 23:08:07 -0700
committerMark Adler <madler@alumni.caltech.edu>2011-09-09 23:08:07 -0700
commitbdde4e09d21edff02ea5093b7f6eccbf166b272f (patch)
treea64632a98a6bea6e5df864d6e5b6f2e51ea69c1c /infcodes.c
parent1c71d8b13b54f91ddec361d3053ecce26e6ff761 (diff)
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zlib 0.92v0.92
Diffstat (limited to 'infcodes.c')
-rw-r--r--infcodes.c184
1 files changed, 92 insertions, 92 deletions
diff --git a/infcodes.c b/infcodes.c
index fc56547..87e661b 100644
--- a/infcodes.c
+++ b/infcodes.c
@@ -19,38 +19,38 @@
19struct inflate_codes_state { 19struct inflate_codes_state {
20 20
21 /* mode */ 21 /* mode */
22 enum { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */ 22 enum { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
23 START, /* x: set up for LEN */ 23 START, /* x: set up for LEN */
24 LEN, /* i: get length/literal/eob next */ 24 LEN, /* i: get length/literal/eob next */
25 LENEXT, /* i: getting length extra (have base) */ 25 LENEXT, /* i: getting length extra (have base) */
26 DIST, /* i: get distance next */ 26 DIST, /* i: get distance next */
27 DISTEXT, /* i: getting distance extra */ 27 DISTEXT, /* i: getting distance extra */
28 COPY, /* o: copying bytes in window, waiting for space */ 28 COPY, /* o: copying bytes in window, waiting for space */
29 LIT, /* o: got literal, waiting for output space */ 29 LIT, /* o: got literal, waiting for output space */
30 WASH, /* o: got eob, possibly still output waiting */ 30 WASH, /* o: got eob, possibly still output waiting */
31 END, /* x: got eob and all data flushed */ 31 END, /* x: got eob and all data flushed */
32 BADCODE} /* x: got error */ 32 BADCODE} /* x: got error */
33 mode; /* current inflate_codes mode */ 33 mode; /* current inflate_codes mode */
34 34
35 /* mode dependent information */ 35 /* mode dependent information */
36 uInt len; 36 uInt len;
37 union { 37 union {
38 struct { 38 struct {
39 inflate_huft *tree; /* pointer into tree */ 39 inflate_huft *tree; /* pointer into tree */
40 uInt need; /* bits needed */ 40 uInt need; /* bits needed */
41 } code; /* if LEN or DIST, where in tree */ 41 } code; /* if LEN or DIST, where in tree */
42 uInt lit; /* if LIT, literal */ 42 uInt lit; /* if LIT, literal */
43 struct { 43 struct {
44 uInt get; /* bits to get for extra */ 44 uInt get; /* bits to get for extra */
45 uInt dist; /* distance back to copy from */ 45 uInt dist; /* distance back to copy from */
46 } copy; /* if EXT or COPY, where and how much */ 46 } copy; /* if EXT or COPY, where and how much */
47 } sub; /* submode */ 47 } sub; /* submode */
48 48
49 /* mode independent information */ 49 /* mode independent information */
50 Byte lbits; /* ltree bits decoded per branch */ 50 Byte lbits; /* ltree bits decoded per branch */
51 Byte dbits; /* dtree bits decoder per branch */ 51 Byte dbits; /* dtree bits decoder per branch */
52 inflate_huft *ltree; /* literal/length/eob tree */ 52 inflate_huft *ltree; /* literal/length/eob tree */
53 inflate_huft *dtree; /* distance tree */ 53 inflate_huft *dtree; /* distance tree */
54 54
55}; 55};
56 56
@@ -81,79 +81,79 @@ struct inflate_blocks_state *s;
81z_stream *z; 81z_stream *z;
82int r; 82int r;
83{ 83{
84 uInt j; /* temporary storage */ 84 uInt j; /* temporary storage */
85 inflate_huft *t; /* temporary pointer */ 85 inflate_huft *t; /* temporary pointer */
86 int e; /* extra bits or operation */ 86 int e; /* extra bits or operation */
87 uLong b; /* bit buffer */ 87 uLong b; /* bit buffer */
88 uInt k; /* bits in bit buffer */ 88 uInt k; /* bits in bit buffer */
89 Byte *p; /* input data pointer */ 89 Byte *p; /* input data pointer */
90 uInt n; /* bytes available there */ 90 uInt n; /* bytes available there */
91 Byte *q; /* output window write pointer */ 91 Byte *q; /* output window write pointer */
92 uInt m; /* bytes to end of window or read pointer */ 92 uInt m; /* bytes to end of window or read pointer */
93 Byte *f; /* pointer to copy strings from */ 93 Byte *f; /* pointer to copy strings from */
94 struct inflate_codes_state *c = s->sub.codes; /* codes state */ 94 struct inflate_codes_state *c = s->sub.codes; /* codes state */
95 95
96 /* copy input/output information to locals (UPDATE macro restores) */ 96 /* copy input/output information to locals (UPDATE macro restores) */
97 LOAD 97 LOAD
98 98
99 /* process input and output based on current state */ 99 /* process input and output based on current state */
100 while (1) switch (c->mode) 100 while (1) switch (c->mode)
101 { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */ 101 { /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
102 case START: /* x: set up for LEN */ 102 case START: /* x: set up for LEN */
103#ifndef SLOW 103#ifndef SLOW
104 if (m >= 258 && n >= 10) 104 if (m >= 258 && n >= 10)
105 { 105 {
106 UPDATE 106 UPDATE
107 r = inflate_fast(c->lbits, c->dbits, c->ltree, c->dtree, s, z); 107 r = inflate_fast(c->lbits, c->dbits, c->ltree, c->dtree, s, z);
108 LOAD 108 LOAD
109 if (r != Z_OK) 109 if (r != Z_OK)
110 { 110 {
111 c->mode = r == Z_STREAM_END ? WASH : BADCODE; 111 c->mode = r == Z_STREAM_END ? WASH : BADCODE;
112 break; 112 break;
113 } 113 }
114 } 114 }
115#endif /* !SLOW */ 115#endif /* !SLOW */
116 c->sub.code.need = c->lbits; 116 c->sub.code.need = c->lbits;
117 c->sub.code.tree = c->ltree; 117 c->sub.code.tree = c->ltree;
118 c->mode = LEN; 118 c->mode = LEN;
119 case LEN: /* i: get length/literal/eob next */ 119 case LEN: /* i: get length/literal/eob next */
120 j = c->sub.code.need; 120 j = c->sub.code.need;
121 NEEDBITS(j) 121 NEEDBITS(j)
122 t = c->sub.code.tree + ((uInt)b & inflate_mask[j]); 122 t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
123 DUMPBITS(t->bits) 123 DUMPBITS(t->bits)
124 if ((e = (int)(t->exop)) < 0) 124 if ((e = (int)(t->exop)) < 0)
125 { 125 {
126 if (e == -128) /* invalid code */ 126 if (e == -128) /* invalid code */
127 { 127 {
128 c->mode = BADCODE; 128 c->mode = BADCODE;
129 z->msg = "invalid literal/length code"; 129 z->msg = "invalid literal/length code";
130 r = Z_DATA_ERROR; 130 r = Z_DATA_ERROR;
131 LEAVE 131 LEAVE
132 } 132 }
133 e = -e; 133 e = -e;
134 if (e & 64) /* end of block */ 134 if (e & 64) /* end of block */
135 { 135 {
136 Tracevv((stderr, "inflate: end of block\n")); 136 Tracevv((stderr, "inflate: end of block\n"));
137 c->mode = WASH; 137 c->mode = WASH;
138 break; 138 break;
139 } 139 }
140 c->sub.code.need = e; 140 c->sub.code.need = e;
141 c->sub.code.tree = t->next; 141 c->sub.code.tree = t->next;
142 break; 142 break;
143 } 143 }
144 if (e & 16) /* literal */ 144 if (e & 16) /* literal */
145 { 145 {
146 c->sub.lit = t->base; 146 c->sub.lit = t->base;
147 Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ? 147 Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
148 "inflate: literal '%c'\n" : 148 "inflate: literal '%c'\n" :
149 "inflate: literal 0x%02x\n", t->base)); 149 "inflate: literal 0x%02x\n", t->base));
150 c->mode = LIT; 150 c->mode = LIT;
151 break; 151 break;
152 } 152 }
153 c->sub.copy.get = e; 153 c->sub.copy.get = e;
154 c->len = t->base; 154 c->len = t->base;
155 c->mode = LENEXT; 155 c->mode = LENEXT;
156 case LENEXT: /* i: getting length extra (have base) */ 156 case LENEXT: /* i: getting length extra (have base) */
157 j = c->sub.copy.get; 157 j = c->sub.copy.get;
158 NEEDBITS(j) 158 NEEDBITS(j)
159 c->len += (uInt)b & inflate_mask[j]; 159 c->len += (uInt)b & inflate_mask[j];
@@ -162,7 +162,7 @@ int r;
162 c->sub.code.tree = c->dtree; 162 c->sub.code.tree = c->dtree;
163 Tracevv((stderr, "inflate: length %u\n", c->len)); 163 Tracevv((stderr, "inflate: length %u\n", c->len));
164 c->mode = DIST; 164 c->mode = DIST;
165 case DIST: /* i: get distance next */ 165 case DIST: /* i: get distance next */
166 j = c->sub.code.need; 166 j = c->sub.code.need;
167 NEEDBITS(j) 167 NEEDBITS(j)
168 t = c->sub.code.tree + ((uInt)b & inflate_mask[j]); 168 t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
@@ -170,46 +170,46 @@ int r;
170 if ((e = (int)(t->exop)) < 0) 170 if ((e = (int)(t->exop)) < 0)
171 { 171 {
172 if (e == -128) 172 if (e == -128)
173 { 173 {
174 c->mode = BADCODE; 174 c->mode = BADCODE;
175 z->msg = "invalid distance code"; 175 z->msg = "invalid distance code";
176 r = Z_DATA_ERROR; 176 r = Z_DATA_ERROR;
177 LEAVE 177 LEAVE
178 } 178 }
179 c->sub.code.need = -e; 179 c->sub.code.need = -e;
180 c->sub.code.tree = t->next; 180 c->sub.code.tree = t->next;
181 break; 181 break;
182 } 182 }
183 c->sub.copy.dist = t->base; 183 c->sub.copy.dist = t->base;
184 c->sub.copy.get = e; 184 c->sub.copy.get = e;
185 c->mode = DISTEXT; 185 c->mode = DISTEXT;
186 case DISTEXT: /* i: getting distance extra */ 186 case DISTEXT: /* i: getting distance extra */
187 j = c->sub.copy.get; 187 j = c->sub.copy.get;
188 NEEDBITS(j) 188 NEEDBITS(j)
189 c->sub.copy.dist += (uInt)b & inflate_mask[j]; 189 c->sub.copy.dist += (uInt)b & inflate_mask[j];
190 DUMPBITS(j) 190 DUMPBITS(j)
191 Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist)); 191 Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist));
192 c->mode = COPY; 192 c->mode = COPY;
193 case COPY: /* o: copying bytes in window, waiting for space */ 193 case COPY: /* o: copying bytes in window, waiting for space */
194 f = (uInt)(q - s->window) < c->sub.copy.dist ? 194 f = (uInt)(q - s->window) < c->sub.copy.dist ?
195 s->end - (c->sub.copy.dist - (q - s->window)) : 195 s->end - (c->sub.copy.dist - (q - s->window)) :
196 q - c->sub.copy.dist; 196 q - c->sub.copy.dist;
197 while (c->len) 197 while (c->len)
198 { 198 {
199 NEEDOUT 199 NEEDOUT
200 OUTBYTE(*f++) 200 OUTBYTE(*f++)
201 if (f == s->end) 201 if (f == s->end)
202 f = s->window; 202 f = s->window;
203 c->len--; 203 c->len--;
204 } 204 }
205 c->mode = START; 205 c->mode = START;
206 break; 206 break;
207 case LIT: /* o: got literal, waiting for output space */ 207 case LIT: /* o: got literal, waiting for output space */
208 NEEDOUT 208 NEEDOUT
209 OUTBYTE(c->sub.lit) 209 OUTBYTE(c->sub.lit)
210 c->mode = START; 210 c->mode = START;
211 break; 211 break;
212 case WASH: /* o: got eob, possibly more output */ 212 case WASH: /* o: got eob, possibly more output */
213 FLUSH 213 FLUSH
214 if (s->read != s->write) 214 if (s->read != s->write)
215 LEAVE 215 LEAVE
@@ -217,7 +217,7 @@ int r;
217 case END: 217 case END:
218 r = Z_STREAM_END; 218 r = Z_STREAM_END;
219 LEAVE 219 LEAVE
220 case BADCODE: /* x: got error */ 220 case BADCODE: /* x: got error */
221 r = Z_DATA_ERROR; 221 r = Z_DATA_ERROR;
222 LEAVE 222 LEAVE
223 default: 223 default:
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-17 00:24:52 +0000