1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005 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 */
14 const char * const z_errmsg
[10] = {
15 "need dictionary", /* Z_NEED_DICT 2 */
16 "stream end", /* Z_STREAM_END 1 */
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) */
27 const char * ZEXPORT
zlibVersion()
32 uLong ZEXPORT
zlibCompileFlags()
37 switch ((int)(sizeof(uInt
))) {
39 case 4: flags
+= 1; break;
40 case 8: flags
+= 2; break;
43 switch ((int)(sizeof(uLong
))) {
45 case 4: flags
+= 1 << 2; break;
46 case 8: flags
+= 2 << 2; break;
47 default: flags
+= 3 << 2;
49 switch ((int)(sizeof(voidpf
))) {
51 case 4: flags
+= 1 << 4; break;
52 case 8: flags
+= 2 << 4; break;
53 default: flags
+= 3 << 4;
55 switch ((int)(sizeof(z_off_t
))) {
57 case 4: flags
+= 1 << 6; break;
58 case 8: flags
+= 2 << 6; break;
59 default: flags
+= 3 << 6;
64 #if defined(ASMV) || defined(ASMINF)
73 #ifdef DYNAMIC_CRC_TABLE
82 #ifdef PKZIP_BUG_WORKAROUND
91 # ifdef HAS_vsprintf_void
95 # ifdef HAS_vsnprintf_void
103 # ifdef HAS_sprintf_void
107 # ifdef HAS_snprintf_void
120 int z_verbose
= verbose
;
125 fprintf(stderr
, "%s\n", m
);
130 /* exported to allow conversion of error code to string for compress() and
133 const char * ZEXPORT
zError(err
)
139 #if defined(_WIN32_WCE)
140 /* The Microsoft C Run-Time Library for Windows CE doesn't have
141 * errno. We define it as a global variable to simplify porting.
142 * Its value is always 0 and should not be used.
149 void zmemcpy(dest
, source
, len
)
154 if (len
== 0) return;
156 *dest
++ = *source
++; /* ??? to be unrolled */
157 } while (--len
!= 0);
160 int zmemcmp(s1
, s2
, len
)
167 for (j
= 0; j
< len
; j
++) {
168 if (s1
[j
] != s2
[j
]) return 2*(s1
[j
] > s2
[j
])-1;
173 void zmemzero(dest
, len
)
177 if (len
== 0) return;
179 *dest
++ = 0; /* ??? to be unrolled */
180 } while (--len
!= 0);
188 /* Turbo C in 16-bit mode */
192 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
193 * and farmalloc(64K) returns a pointer with an offset of 8, so we
194 * must fix the pointer. Warning: the pointer must be put back to its
195 * original form in order to free it, use zcfree().
201 local
int next_ptr
= 0;
203 typedef struct ptr_table_s
{
208 local ptr_table table
[MAX_PTR
];
209 /* This table is used to remember the original form of pointers
210 * to large buffers (64K). Such pointers are normalized with a zero offset.
211 * Since MSDOS is not a preemptive multitasking OS, this table is not
212 * protected from concurrent access. This hack doesn't work anyway on
213 * a protected system like OS/2. Use Microsoft C instead.
216 voidpf
zcalloc (voidpf opaque
, unsigned items
, unsigned size
)
218 voidpf buf
= opaque
; /* just to make some compilers happy */
219 ulg bsize
= (ulg
)items
*size
;
221 /* If we allocate less than 65520 bytes, we assume that farmalloc
222 * will return a usable pointer which doesn't have to be normalized.
224 if (bsize
< 65520L) {
225 buf
= farmalloc(bsize
);
226 if (*(ush
*)&buf
!= 0) return buf
;
228 buf
= farmalloc(bsize
+ 16L);
230 if (buf
== NULL
|| next_ptr
>= MAX_PTR
) return NULL
;
231 table
[next_ptr
].org_ptr
= buf
;
233 /* Normalize the pointer to seg:0 */
234 *((ush
*)&buf
+1) += ((ush
)((uch
*)buf
-0) + 15) >> 4;
236 table
[next_ptr
++].new_ptr
= buf
;
240 void zcfree (voidpf opaque
, voidpf ptr
)
243 if (*(ush
*)&ptr
!= 0) { /* object < 64K */
247 /* Find the original pointer */
248 for (n
= 0; n
< next_ptr
; n
++) {
249 if (ptr
!= table
[n
].new_ptr
) continue;
251 farfree(table
[n
].org_ptr
);
252 while (++n
< next_ptr
) {
253 table
[n
-1] = table
[n
];
258 ptr
= opaque
; /* just to make some compilers happy */
259 Assert(0, "zcfree: ptr not found");
262 #endif /* __TURBOC__ */
266 /* Microsoft C in 16-bit mode */
270 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
271 # define _halloc halloc
272 # define _hfree hfree
275 voidpf
zcalloc (voidpf opaque
, unsigned items
, unsigned size
)
277 if (opaque
) opaque
= 0; /* to make compiler happy */
278 return _halloc((long)items
, size
);
281 void zcfree (voidpf opaque
, voidpf ptr
)
283 if (opaque
) opaque
= 0; /* to make compiler happy */
289 #endif /* SYS16BIT */
292 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
295 extern voidp malloc
OF((uInt size
));
296 extern voidp calloc
OF((uInt items
, uInt size
));
297 extern void free
OF((voidpf ptr
));
300 voidpf
zcalloc (opaque
, items
, size
)
305 if (opaque
) items
+= size
- size
; /* make compiler happy */
306 return sizeof(uInt
) > 2 ? (voidpf
)malloc(items
* size
) :
307 (voidpf
)calloc(items
, size
);
310 void zcfree (opaque
, ptr
)
315 if (opaque
) return; /* make compiler happy */
318 #endif /* MY_ZCALLOC */