1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2017 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h
6 /* @(#) $Id: zutil.c,v 1.1.1.2 2002/03/11 21:53:27 tromey Exp $ */
13 z_const
char * const z_errmsg
[10] = {
14 (z_const
char *)"need dictionary", /* Z_NEED_DICT 2 */
15 (z_const
char *)"stream end", /* Z_STREAM_END 1 */
16 (z_const
char *)"", /* Z_OK 0 */
17 (z_const
char *)"file error", /* Z_ERRNO (-1) */
18 (z_const
char *)"stream error", /* Z_STREAM_ERROR (-2) */
19 (z_const
char *)"data error", /* Z_DATA_ERROR (-3) */
20 (z_const
char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
21 (z_const
char *)"buffer error", /* Z_BUF_ERROR (-5) */
22 (z_const
char *)"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
88 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
91 # ifdef HAS_vsprintf_void
95 # ifdef HAS_vsnprintf_void
103 # ifdef HAS_sprintf_void
107 # ifdef HAS_snprintf_void
120 int ZLIB_INTERNAL z_verbose
= verbose
;
122 void ZLIB_INTERNAL
z_error (m
)
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 ZLIB_INTERNAL
zmemcpy(dest
, source
, len
)
154 if (len
== 0) return;
156 *dest
++ = *source
++; /* ??? to be unrolled */
157 } while (--len
!= 0);
160 int ZLIB_INTERNAL
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 ZLIB_INTERNAL
zmemzero(dest
, len
)
177 if (len
== 0) return;
179 *dest
++ = 0; /* ??? to be unrolled */
180 } 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 ZLIB_INTERNAL
zcalloc (voidpf opaque
, unsigned items
, unsigned size
)
220 ulg bsize
= (ulg
)items
*size
;
224 /* If we allocate less than 65520 bytes, we assume that farmalloc
225 * will return a usable pointer which doesn't have to be normalized.
227 if (bsize
< 65520L) {
228 buf
= farmalloc(bsize
);
229 if (*(ush
*)&buf
!= 0) return buf
;
231 buf
= farmalloc(bsize
+ 16L);
233 if (buf
== NULL
|| next_ptr
>= MAX_PTR
) return NULL
;
234 table
[next_ptr
].org_ptr
= buf
;
236 /* Normalize the pointer to seg:0 */
237 *((ush
*)&buf
+1) += ((ush
)((uch
*)buf
-0) + 15) >> 4;
239 table
[next_ptr
++].new_ptr
= buf
;
243 void ZLIB_INTERNAL
zcfree (voidpf opaque
, voidpf ptr
)
249 if (*(ush
*)&ptr
!= 0) { /* object < 64K */
253 /* Find the original pointer */
254 for (n
= 0; n
< next_ptr
; n
++) {
255 if (ptr
!= table
[n
].new_ptr
) continue;
257 farfree(table
[n
].org_ptr
);
258 while (++n
< next_ptr
) {
259 table
[n
-1] = table
[n
];
264 Assert(0, "zcfree: ptr not found");
267 #endif /* __TURBOC__ */
271 /* Microsoft C in 16-bit mode */
275 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
276 # define _halloc halloc
277 # define _hfree hfree
280 voidpf ZLIB_INTERNAL
zcalloc (voidpf opaque
, uInt items
, uInt size
)
283 return _halloc((long)items
, size
);
286 void ZLIB_INTERNAL
zcfree (voidpf opaque
, voidpf ptr
)
294 #endif /* SYS16BIT */
297 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
300 extern voidp malloc
OF((uInt size
));
301 extern voidp calloc
OF((uInt items
, uInt size
));
302 extern void free
OF((voidpf ptr
));
305 voidpf ZLIB_INTERNAL
zcalloc (opaque
, items
, size
)
311 return sizeof(uInt
) > 2 ? (voidpf
)malloc(items
* size
) :
312 (voidpf
)calloc(items
, size
);
315 void ZLIB_INTERNAL
zcfree (opaque
, ptr
)
323 #endif /* MY_ZCALLOC */
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