1: /* zutil.c -- target dependent utility functions for the compression library
2: * Copyright (C) 1995-2005, 2010, 2011, 2012 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 2013/10/14 07:51:14 misho Exp $ */
7:
8: #include "zutil.h"
9: #ifndef Z_SOLO
10: # include "gzguts.h"
11: #endif
12:
13: #ifndef NO_DUMMY_DECL
14: struct internal_state {int dummy;}; /* for buggy compilers */
15: #endif
16:
17: z_const char * const z_errmsg[10] = {
18: "need dictionary", /* Z_NEED_DICT 2 */
19: "stream end", /* Z_STREAM_END 1 */
20: "", /* Z_OK 0 */
21: "file error", /* Z_ERRNO (-1) */
22: "stream error", /* Z_STREAM_ERROR (-2) */
23: "data error", /* Z_DATA_ERROR (-3) */
24: "insufficient memory", /* Z_MEM_ERROR (-4) */
25: "buffer error", /* Z_BUF_ERROR (-5) */
26: "incompatible version",/* Z_VERSION_ERROR (-6) */
27: ""};
28:
29:
30: const char * ZEXPORT zlibVersion()
31: {
32: return ZLIB_VERSION;
33: }
34:
35: uLong ZEXPORT zlibCompileFlags()
36: {
37: uLong flags;
38:
39: flags = 0;
40: switch ((int)(sizeof(uInt))) {
41: case 2: break; /* CONSTANT CONDITION */
42: case 4: flags += 1; break; /* CONSTANT CONDITION */
43: case 8: flags += 2; break; /* CONSTANT CONDITION */
44: default: flags += 3;
45: }
46: switch ((int)(sizeof(uLong))) {
47: case 2: break; /* CONSTANT CONDITION */
48: case 4: flags += 1 << 2; break; /* CONSTANT CONDITION */
49: case 8: flags += 2 << 2; break; /* CONSTANT CONDITION */
50: default: flags += 3 << 2;
51: }
52: switch ((int)(sizeof(voidpf))) {
53: case 2: break; /* CONSTANT CONDITION */
54: case 4: flags += 1 << 4; break; /* CONSTANT CONDITION */
55: case 8: flags += 2 << 4; break; /* CONSTANT CONDITION */
56: default: flags += 3 << 4;
57: }
58: switch ((int)(sizeof(z_off_t))) {
59: case 2: break; /* CONSTANT CONDITION */
60: case 4: flags += 1 << 6; break; /* CONSTANT CONDITION */
61: case 8: flags += 2 << 6; break; /* CONSTANT CONDITION */
62: default: flags += 3 << 6;
63: }
64: #ifdef DEBUG
65: flags += 1 << 8;
66: #endif
67: #if defined(ASMV) || defined(ASMINF)
68: flags += 1 << 9;
69: #endif
70: #ifdef ZLIB_WINAPI
71: flags += 1 << 10;
72: #endif
73: #ifdef BUILDFIXED
74: flags += 1 << 12;
75: #endif
76: #ifdef DYNAMIC_CRC_TABLE
77: flags += 1 << 13;
78: #endif
79: #ifdef NO_GZCOMPRESS
80: flags += 1L << 16;
81: #endif
82: #ifdef NO_GZIP
83: flags += 1L << 17;
84: #endif
85: #ifdef PKZIP_BUG_WORKAROUND
86: flags += 1L << 20;
87: #endif
88: #ifdef FASTEST
89: flags += 1L << 21;
90: #endif
91: #if defined(STDC) || defined(Z_HAVE_STDARG_H)
92: # ifdef NO_vsnprintf
93: flags += 1L << 25;
94: # ifdef HAS_vsprintf_void
95: flags += 1L << 26;
96: # endif
97: # else
98: # ifdef HAS_vsnprintf_void
99: flags += 1L << 26;
100: # endif
101: # endif
102: #else
103: flags += 1L << 24;
104: # ifdef NO_snprintf
105: flags += 1L << 25;
106: # ifdef HAS_sprintf_void
107: flags += 1L << 26;
108: # endif
109: # else
110: # ifdef HAS_snprintf_void
111: flags += 1L << 26;
112: # endif
113: # endif
114: #endif
115: return flags;
116: }
117:
118: #ifdef DEBUG
119:
120: # ifndef verbose
121: # define verbose 0
122: # endif
123: int ZLIB_INTERNAL z_verbose = verbose;
124:
125: void ZLIB_INTERNAL z_error (m)
126: char *m;
127: {
128: fprintf(stderr, "%s\n", m);
129: exit(1);
130: }
131: #endif
132:
133: /* exported to allow conversion of error code to string for compress() and
134: * uncompress()
135: */
136: const char * ZEXPORT zError(err)
137: int err;
138: {
139: return ERR_MSG(err);
140: }
141:
142: #if defined(_WIN32_WCE)
143: /* The Microsoft C Run-Time Library for Windows CE doesn't have
144: * errno. We define it as a global variable to simplify porting.
145: * Its value is always 0 and should not be used.
146: */
147: int errno = 0;
148: #endif
149:
150: #ifndef HAVE_MEMCPY
151:
152: void ZLIB_INTERNAL zmemcpy(dest, source, len)
153: Bytef* dest;
154: const Bytef* source;
155: uInt len;
156: {
157: if (len == 0) return;
158: do {
159: *dest++ = *source++; /* ??? to be unrolled */
160: } while (--len != 0);
161: }
162:
163: int ZLIB_INTERNAL zmemcmp(s1, s2, len)
164: const Bytef* s1;
165: const Bytef* s2;
166: uInt len;
167: {
168: uInt j;
169:
170: for (j = 0; j < len; j++) {
171: if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
172: }
173: return 0;
174: }
175:
176: void ZLIB_INTERNAL zmemzero(dest, len)
177: Bytef* dest;
178: uInt len;
179: {
180: if (len == 0) return;
181: do {
182: *dest++ = 0; /* ??? to be unrolled */
183: } while (--len != 0);
184: }
185: #endif
186:
187: #ifndef Z_SOLO
188:
189: #ifdef SYS16BIT
190:
191: #ifdef __TURBOC__
192: /* Turbo C in 16-bit mode */
193:
194: # define MY_ZCALLOC
195:
196: /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
197: * and farmalloc(64K) returns a pointer with an offset of 8, so we
198: * must fix the pointer. Warning: the pointer must be put back to its
199: * original form in order to free it, use zcfree().
200: */
201:
202: #define MAX_PTR 10
203: /* 10*64K = 640K */
204:
205: local int next_ptr = 0;
206:
207: typedef struct ptr_table_s {
208: voidpf org_ptr;
209: voidpf new_ptr;
210: } ptr_table;
211:
212: local ptr_table table[MAX_PTR];
213: /* This table is used to remember the original form of pointers
214: * to large buffers (64K). Such pointers are normalized with a zero offset.
215: * Since MSDOS is not a preemptive multitasking OS, this table is not
216: * protected from concurrent access. This hack doesn't work anyway on
217: * a protected system like OS/2. Use Microsoft C instead.
218: */
219:
220: voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
221: {
222: voidpf buf = opaque; /* just to make some compilers happy */
223: ulg bsize = (ulg)items*size;
224:
225: /* If we allocate less than 65520 bytes, we assume that farmalloc
226: * will return a usable pointer which doesn't have to be normalized.
227: */
228: if (bsize < 65520L) {
229: buf = farmalloc(bsize);
230: if (*(ush*)&buf != 0) return buf;
231: } else {
232: buf = farmalloc(bsize + 16L);
233: }
234: if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
235: table[next_ptr].org_ptr = buf;
236:
237: /* Normalize the pointer to seg:0 */
238: *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
239: *(ush*)&buf = 0;
240: table[next_ptr++].new_ptr = buf;
241: return buf;
242: }
243:
244: void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
245: {
246: int n;
247: if (*(ush*)&ptr != 0) { /* object < 64K */
248: farfree(ptr);
249: return;
250: }
251: /* Find the original pointer */
252: for (n = 0; n < next_ptr; n++) {
253: if (ptr != table[n].new_ptr) continue;
254:
255: farfree(table[n].org_ptr);
256: while (++n < next_ptr) {
257: table[n-1] = table[n];
258: }
259: next_ptr--;
260: return;
261: }
262: ptr = opaque; /* just to make some compilers happy */
263: Assert(0, "zcfree: ptr not found");
264: }
265:
266: #endif /* __TURBOC__ */
267:
268:
269: #ifdef M_I86
270: /* Microsoft C in 16-bit mode */
271:
272: # define MY_ZCALLOC
273:
274: #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
275: # define _halloc halloc
276: # define _hfree hfree
277: #endif
278:
279: voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
280: {
281: if (opaque) opaque = 0; /* to make compiler happy */
282: return _halloc((long)items, size);
283: }
284:
285: void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
286: {
287: if (opaque) opaque = 0; /* to make compiler happy */
288: _hfree(ptr);
289: }
290:
291: #endif /* M_I86 */
292:
293: #endif /* SYS16BIT */
294:
295:
296: #ifndef MY_ZCALLOC /* Any system without a special alloc function */
297:
298: #ifndef STDC
299: extern voidp malloc OF((uInt size));
300: extern voidp calloc OF((uInt items, uInt size));
301: extern void free OF((voidpf ptr));
302: #endif
303:
304: voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
305: voidpf opaque;
306: unsigned items;
307: unsigned size;
308: {
309: if (opaque) items += size - size; /* make compiler happy */
310: return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
311: (voidpf)calloc(items, size);
312: }
313:
314: void ZLIB_INTERNAL zcfree (opaque, ptr)
315: voidpf opaque;
316: voidpf ptr;
317: {
318: free(ptr);
319: if (opaque) return; /* make compiler happy */
320: }
321:
322: #endif /* MY_ZCALLOC */
323:
324: #endif /* !Z_SOLO */
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