File:
[ELWIX - Embedded LightWeight unIX -] /
embedaddon /
sudo /
zlib /
zutil.c
Revision
1.1.1.2 (vendor branch):
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Mon Jul 22 10:46:14 2013 UTC (10 years, 11 months ago) by
misho
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MAIN
CVS tags:
v1_8_8p0,
v1_8_8,
v1_8_7p0,
v1_8_7,
v1_8_5p1,
v1_8_10p3_0,
v1_8_10p3,
HEAD
1.8.7
1: /* zutil.c -- target dependent utility functions for the compression library
2: * Copyright (C) 1995-2005, 2010, 2011 Jean-loup Gailly.
3: * For conditions of distribution and use, see copyright notice in zlib.h
4: */
5:
6: /* @(#) $Id: zutil.c,v 1.1.1.2 2013/07/22 10:46:14 misho Exp $ */
7:
8: #include "zutil.h"
9:
10: #ifndef NO_DUMMY_DECL
11: struct internal_state {int dummy;}; /* for buggy compilers */
12: #endif
13:
14: const char * const z_errmsg[10] = {
15: "need dictionary", /* Z_NEED_DICT 2 */
16: "stream end", /* Z_STREAM_END 1 */
17: "", /* Z_OK 0 */
18: "file error", /* Z_ERRNO (-1) */
19: "stream error", /* Z_STREAM_ERROR (-2) */
20: "data error", /* Z_DATA_ERROR (-3) */
21: "insufficient memory", /* Z_MEM_ERROR (-4) */
22: "buffer error", /* Z_BUF_ERROR (-5) */
23: "incompatible version",/* Z_VERSION_ERROR (-6) */
24: ""};
25:
26:
27: const char * ZEXPORT zlibVersion()
28: {
29: return ZLIB_VERSION;
30: }
31:
32: uLong ZEXPORT zlibCompileFlags()
33: {
34: uLong flags;
35:
36: flags = 0;
37: switch ((int)(sizeof(uInt))) {
38: case 2: break;
39: case 4: flags += 1; break;
40: case 8: flags += 2; break;
41: default: flags += 3;
42: }
43: switch ((int)(sizeof(uLong))) {
44: case 2: break;
45: case 4: flags += 1 << 2; break;
46: case 8: flags += 2 << 2; break;
47: default: flags += 3 << 2;
48: }
49: switch ((int)(sizeof(voidpf))) {
50: case 2: break;
51: case 4: flags += 1 << 4; break;
52: case 8: flags += 2 << 4; break;
53: default: flags += 3 << 4;
54: }
55: switch ((int)(sizeof(z_off_t))) {
56: case 2: break;
57: case 4: flags += 1 << 6; break;
58: case 8: flags += 2 << 6; break;
59: default: flags += 3 << 6;
60: }
61: #ifdef DEBUG
62: flags += 1 << 8;
63: #endif
64: #if defined(ASMV) || defined(ASMINF)
65: flags += 1 << 9;
66: #endif
67: #ifdef ZLIB_WINAPI
68: flags += 1 << 10;
69: #endif
70: #ifdef BUILDFIXED
71: flags += 1 << 12;
72: #endif
73: #ifdef DYNAMIC_CRC_TABLE
74: flags += 1 << 13;
75: #endif
76: #ifdef NO_GZCOMPRESS
77: flags += 1L << 16;
78: #endif
79: #ifdef NO_GZIP
80: flags += 1L << 17;
81: #endif
82: #ifdef PKZIP_BUG_WORKAROUND
83: flags += 1L << 20;
84: #endif
85: #ifdef FASTEST
86: flags += 1L << 21;
87: #endif
88: #ifdef Z_SOLO
89: return flags;
90: #else
91: return flags + gzflags();
92: #endif
93: }
94:
95: #ifdef DEBUG
96:
97: # ifndef verbose
98: # define verbose 0
99: # endif
100: int ZLIB_INTERNAL z_verbose = verbose;
101:
102: void ZLIB_INTERNAL z_error (m)
103: char *m;
104: {
105: fprintf(stderr, "%s\n", m);
106: exit(1);
107: }
108: #endif
109:
110: /* exported to allow conversion of error code to string for compress() and
111: * uncompress()
112: */
113: const char * ZEXPORT zError(err)
114: int err;
115: {
116: return ERR_MSG(err);
117: }
118:
119: #if defined(_WIN32_WCE)
120: /* The Microsoft C Run-Time Library for Windows CE doesn't have
121: * errno. We define it as a global variable to simplify porting.
122: * Its value is always 0 and should not be used.
123: */
124: int errno = 0;
125: #endif
126:
127: #ifndef HAVE_MEMCPY
128:
129: void ZLIB_INTERNAL zmemcpy(dest, source, len)
130: Bytef* dest;
131: const Bytef* source;
132: uInt len;
133: {
134: if (len == 0) return;
135: do {
136: *dest++ = *source++; /* ??? to be unrolled */
137: } while (--len != 0);
138: }
139:
140: int ZLIB_INTERNAL zmemcmp(s1, s2, len)
141: const Bytef* s1;
142: const Bytef* s2;
143: uInt len;
144: {
145: uInt j;
146:
147: for (j = 0; j < len; j++) {
148: if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
149: }
150: return 0;
151: }
152:
153: void ZLIB_INTERNAL zmemzero(dest, len)
154: Bytef* dest;
155: uInt len;
156: {
157: if (len == 0) return;
158: do {
159: *dest++ = 0; /* ??? to be unrolled */
160: } while (--len != 0);
161: }
162: #endif
163:
164: #ifndef Z_SOLO
165:
166: #ifdef SYS16BIT
167:
168: #ifdef __TURBOC__
169: /* Turbo C in 16-bit mode */
170:
171: # define MY_ZCALLOC
172:
173: /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
174: * and farmalloc(64K) returns a pointer with an offset of 8, so we
175: * must fix the pointer. Warning: the pointer must be put back to its
176: * original form in order to free it, use zcfree().
177: */
178:
179: #define MAX_PTR 10
180: /* 10*64K = 640K */
181:
182: local int next_ptr = 0;
183:
184: typedef struct ptr_table_s {
185: voidpf org_ptr;
186: voidpf new_ptr;
187: } ptr_table;
188:
189: local ptr_table table[MAX_PTR];
190: /* This table is used to remember the original form of pointers
191: * to large buffers (64K). Such pointers are normalized with a zero offset.
192: * Since MSDOS is not a preemptive multitasking OS, this table is not
193: * protected from concurrent access. This hack doesn't work anyway on
194: * a protected system like OS/2. Use Microsoft C instead.
195: */
196:
197: voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
198: {
199: voidpf buf = opaque; /* just to make some compilers happy */
200: ulg bsize = (ulg)items*size;
201:
202: /* If we allocate less than 65520 bytes, we assume that farmalloc
203: * will return a usable pointer which doesn't have to be normalized.
204: */
205: if (bsize < 65520L) {
206: buf = farmalloc(bsize);
207: if (*(ush*)&buf != 0) return buf;
208: } else {
209: buf = farmalloc(bsize + 16L);
210: }
211: if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
212: table[next_ptr].org_ptr = buf;
213:
214: /* Normalize the pointer to seg:0 */
215: *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
216: *(ush*)&buf = 0;
217: table[next_ptr++].new_ptr = buf;
218: return buf;
219: }
220:
221: void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
222: {
223: int n;
224: if (*(ush*)&ptr != 0) { /* object < 64K */
225: farfree(ptr);
226: return;
227: }
228: /* Find the original pointer */
229: for (n = 0; n < next_ptr; n++) {
230: if (ptr != table[n].new_ptr) continue;
231:
232: farfree(table[n].org_ptr);
233: while (++n < next_ptr) {
234: table[n-1] = table[n];
235: }
236: next_ptr--;
237: return;
238: }
239: ptr = opaque; /* just to make some compilers happy */
240: Assert(0, "zcfree: ptr not found");
241: }
242:
243: #endif /* __TURBOC__ */
244:
245:
246: #ifdef M_I86
247: /* Microsoft C in 16-bit mode */
248:
249: # define MY_ZCALLOC
250:
251: #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
252: # define _halloc halloc
253: # define _hfree hfree
254: #endif
255:
256: voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
257: {
258: if (opaque) opaque = 0; /* to make compiler happy */
259: return _halloc((long)items, size);
260: }
261:
262: void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
263: {
264: if (opaque) opaque = 0; /* to make compiler happy */
265: _hfree(ptr);
266: }
267:
268: #endif /* M_I86 */
269:
270: #endif /* SYS16BIT */
271:
272:
273: #ifndef MY_ZCALLOC /* Any system without a special alloc function */
274:
275: #ifndef STDC
276: extern voidp malloc OF((uInt size));
277: extern voidp calloc OF((uInt items, uInt size));
278: extern void free OF((voidpf ptr));
279: #endif
280:
281: voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
282: voidpf opaque;
283: unsigned items;
284: unsigned size;
285: {
286: if (opaque) items += size - size; /* make compiler happy */
287: return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
288: (voidpf)calloc(items, size);
289: }
290:
291: void ZLIB_INTERNAL zcfree (opaque, ptr)
292: voidpf opaque;
293: voidpf ptr;
294: {
295: free(ptr);
296: if (opaque) return; /* make compiler happy */
297: }
298:
299: #endif /* MY_ZCALLOC */
300:
301: #endif /* !Z_SOLO */
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