1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2003 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
11 struct internal_state
{int dummy
;}; /* for buggy compilers */
15 extern void exit
OF((int));
18 const char * const z_errmsg
[10] = {
19 "need dictionary", /* Z_NEED_DICT 2 */
20 "stream end", /* Z_STREAM_END 1 */
22 "file error", /* Z_ERRNO (-1) */
23 "stream error", /* Z_STREAM_ERROR (-2) */
24 "data error", /* Z_DATA_ERROR (-3) */
25 "insufficient memory", /* Z_MEM_ERROR (-4) */
26 "buffer error", /* Z_BUF_ERROR (-5) */
27 "incompatible version",/* Z_VERSION_ERROR (-6) */
31 const char * ZEXPORT
zlibVersion()
36 uLong ZEXPORT
zlibCompileFlags()
41 switch (sizeof(uInt
)) {
43 case 4: flags
+= 1; break;
44 case 8: flags
+= 2; break;
47 switch (sizeof(uLong
)) {
49 case 4: flags
+= 1 << 2; break;
50 case 8: flags
+= 2 << 2; break;
51 default: flags
+= 3 << 2;
53 switch (sizeof(voidpf
)) {
55 case 4: flags
+= 1 << 4; break;
56 case 8: flags
+= 2 << 4; break;
57 default: flags
+= 3 << 4;
59 switch (sizeof(z_off_t
)) {
61 case 4: flags
+= 1 << 6; break;
62 case 8: flags
+= 2 << 6; break;
63 default: flags
+= 3 << 6;
68 #if defined(ASMV) || defined(ASMINF)
77 #ifdef DYNAMIC_CRC_TABLE
86 #ifdef PKZIP_BUG_WORKAROUND
95 # ifdef HAS_vsprintf_void
99 # ifdef HAS_vsnprintf_void
107 # ifdef HAS_sprintf_void
111 # ifdef HAS_snprintf_void
124 int z_verbose
= verbose
;
129 fprintf(stderr
, "%s\n", m
);
134 /* exported to allow conversion of error code to string for compress() and
137 const char * ZEXPORT
zError(err
)
143 #if defined(_WIN32_WCE)
144 /* does not exist on WCE */
150 void zmemcpy(dest
, source
, len
)
155 if (len
== 0) return;
157 *dest
++ = *source
++; /* ??? to be unrolled */
158 } while (--len
!= 0);
161 int zmemcmp(s1
, s2
, len
)
168 for (j
= 0; j
< len
; j
++) {
169 if (s1
[j
] != s2
[j
]) return 2*(s1
[j
] > s2
[j
])-1;
174 void zmemzero(dest
, len
)
178 if (len
== 0) return;
180 *dest
++ = 0; /* ??? to be unrolled */
181 } while (--len
!= 0);
189 /* Turbo C in 16-bit mode */
193 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
194 * and farmalloc(64K) returns a pointer with an offset of 8, so we
195 * must fix the pointer. Warning: the pointer must be put back to its
196 * original form in order to free it, use zcfree().
202 local
int next_ptr
= 0;
204 typedef struct ptr_table_s
{
209 local ptr_table table
[MAX_PTR
];
210 /* This table is used to remember the original form of pointers
211 * to large buffers (64K). Such pointers are normalized with a zero offset.
212 * Since MSDOS is not a preemptive multitasking OS, this table is not
213 * protected from concurrent access. This hack doesn't work anyway on
214 * a protected system like OS/2. Use Microsoft C instead.
217 voidpf
zcalloc (voidpf opaque
, unsigned items
, unsigned size
)
219 voidpf buf
= opaque
; /* just to make some compilers happy */
220 ulg bsize
= (ulg
)items
*size
;
222 /* If we allocate less than 65520 bytes, we assume that farmalloc
223 * will return a usable pointer which doesn't have to be normalized.
225 if (bsize
< 65520L) {
226 buf
= farmalloc(bsize
);
227 if (*(ush
*)&buf
!= 0) return buf
;
229 buf
= farmalloc(bsize
+ 16L);
231 if (buf
== NULL
|| next_ptr
>= MAX_PTR
) return NULL
;
232 table
[next_ptr
].org_ptr
= buf
;
234 /* Normalize the pointer to seg:0 */
235 *((ush
*)&buf
+1) += ((ush
)((uch
*)buf
-0) + 15) >> 4;
237 table
[next_ptr
++].new_ptr
= buf
;
241 void zcfree (voidpf opaque
, voidpf ptr
)
244 if (*(ush
*)&ptr
!= 0) { /* object < 64K */
248 /* Find the original pointer */
249 for (n
= 0; n
< next_ptr
; n
++) {
250 if (ptr
!= table
[n
].new_ptr
) continue;
252 farfree(table
[n
].org_ptr
);
253 while (++n
< next_ptr
) {
254 table
[n
-1] = table
[n
];
259 ptr
= opaque
; /* just to make some compilers happy */
260 Assert(0, "zcfree: ptr not found");
263 #endif /* __TURBOC__ */
267 /* Microsoft C in 16-bit mode */
271 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
272 # define _halloc halloc
273 # define _hfree hfree
276 voidpf
zcalloc (voidpf opaque
, unsigned items
, unsigned size
)
278 if (opaque
) opaque
= 0; /* to make compiler happy */
279 return _halloc((long)items
, size
);
282 void zcfree (voidpf opaque
, voidpf ptr
)
284 if (opaque
) opaque
= 0; /* to make compiler happy */
290 #endif /* SYS16BIT */
293 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
296 extern voidp malloc
OF((uInt size
));
297 extern voidp calloc
OF((uInt items
, uInt size
));
298 extern void free
OF((voidpf ptr
));
301 voidpf
zcalloc (opaque
, items
, size
)
306 if (opaque
) items
+= size
- size
; /* make compiler happy */
307 return sizeof(uInt
) > 2 ? (voidpf
)malloc(items
* size
) :
308 (voidpf
)calloc(items
, size
);
311 void zcfree (opaque
, ptr
)
316 if (opaque
) return; /* make compiler happy */
319 #endif /* MY_ZCALLOC */