| // SPDX-License-Identifier: Zlib |
| /* zutil.c -- target dependent utility functions for the compression library |
| * Copyright (C) 1995-2017 Jean-loup Gailly |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* @(#) $Id$ */ |
| |
| #include "zutil.h" |
| #ifndef Z_SOLO |
| # include "gzguts.h" |
| #endif |
| |
| z_const char * const z_errmsg[10] = { |
| (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */ |
| (z_const char *)"stream end", /* Z_STREAM_END 1 */ |
| (z_const char *)"", /* Z_OK 0 */ |
| (z_const char *)"file error", /* Z_ERRNO (-1) */ |
| (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */ |
| (z_const char *)"data error", /* Z_DATA_ERROR (-3) */ |
| (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */ |
| (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */ |
| (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */ |
| (z_const char *)"" |
| }; |
| |
| |
| const char * ZEXPORT zlibVersion() |
| { |
| return ZLIB_VERSION; |
| } |
| |
| uLong ZEXPORT zlibCompileFlags() |
| { |
| uLong flags; |
| |
| flags = 0; |
| switch ((int)(sizeof(uInt))) { |
| case 2: break; |
| case 4: flags += 1; break; |
| case 8: flags += 2; break; |
| default: flags += 3; |
| } |
| switch ((int)(sizeof(uLong))) { |
| case 2: break; |
| case 4: flags += 1 << 2; break; |
| case 8: flags += 2 << 2; break; |
| default: flags += 3 << 2; |
| } |
| switch ((int)(sizeof(voidpf))) { |
| case 2: break; |
| case 4: flags += 1 << 4; break; |
| case 8: flags += 2 << 4; break; |
| default: flags += 3 << 4; |
| } |
| switch ((int)(sizeof(z_off_t))) { |
| case 2: break; |
| case 4: flags += 1 << 6; break; |
| case 8: flags += 2 << 6; break; |
| default: flags += 3 << 6; |
| } |
| #ifdef ZLIB_DEBUG |
| flags += 1 << 8; |
| #endif |
| #if defined(ASMV) || defined(ASMINF) |
| flags += 1 << 9; |
| #endif |
| #ifdef ZLIB_WINAPI |
| flags += 1 << 10; |
| #endif |
| #ifdef BUILDFIXED |
| flags += 1 << 12; |
| #endif |
| #ifdef DYNAMIC_CRC_TABLE |
| flags += 1 << 13; |
| #endif |
| #ifdef NO_GZCOMPRESS |
| flags += 1L << 16; |
| #endif |
| #ifdef NO_GZIP |
| flags += 1L << 17; |
| #endif |
| #ifdef PKZIP_BUG_WORKAROUND |
| flags += 1L << 20; |
| #endif |
| #ifdef FASTEST |
| flags += 1L << 21; |
| #endif |
| #if defined(STDC) || defined(Z_HAVE_STDARG_H) |
| # ifdef NO_vsnprintf |
| flags += 1L << 25; |
| # ifdef HAS_vsprintf_void |
| flags += 1L << 26; |
| # endif |
| # else |
| # ifdef HAS_vsnprintf_void |
| flags += 1L << 26; |
| # endif |
| # endif |
| #else |
| flags += 1L << 24; |
| # ifdef NO_snprintf |
| flags += 1L << 25; |
| # ifdef HAS_sprintf_void |
| flags += 1L << 26; |
| # endif |
| # else |
| # ifdef HAS_snprintf_void |
| flags += 1L << 26; |
| # endif |
| # endif |
| #endif |
| return flags; |
| } |
| |
| #ifdef ZLIB_DEBUG |
| #include <stdlib.h> |
| # ifndef verbose |
| # define verbose 0 |
| # endif |
| int ZLIB_INTERNAL z_verbose = verbose; |
| |
| void ZLIB_INTERNAL z_error (m) |
| char *m; |
| { |
| fprintf(stderr, "%s\n", m); |
| exit(1); |
| } |
| #endif |
| |
| /* exported to allow conversion of error code to string for compress() and |
| * uncompress() |
| */ |
| const char * ZEXPORT zError(err) |
| int err; |
| { |
| return ERR_MSG(err); |
| } |
| |
| #if defined(_WIN32_WCE) |
| /* The Microsoft C Run-Time Library for Windows CE doesn't have |
| * errno. We define it as a global variable to simplify porting. |
| * Its value is always 0 and should not be used. |
| */ |
| int errno = 0; |
| #endif |
| |
| #ifndef HAVE_MEMCPY |
| |
| void ZLIB_INTERNAL zmemcpy(dest, source, len) |
| Bytef* dest; |
| const Bytef* source; |
| uInt len; |
| { |
| if (len == 0) return; |
| do { |
| *dest++ = *source++; /* ??? to be unrolled */ |
| } while (--len != 0); |
| } |
| |
| int ZLIB_INTERNAL zmemcmp(s1, s2, len) |
| const Bytef* s1; |
| const Bytef* s2; |
| uInt len; |
| { |
| uInt j; |
| |
| for (j = 0; j < len; j++) { |
| if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
| } |
| return 0; |
| } |
| |
| void ZLIB_INTERNAL zmemzero(dest, len) |
| Bytef* dest; |
| uInt len; |
| { |
| if (len == 0) return; |
| do { |
| *dest++ = 0; /* ??? to be unrolled */ |
| } while (--len != 0); |
| } |
| #endif |
| |
| #ifndef Z_SOLO |
| |
| #ifdef SYS16BIT |
| |
| #ifdef __TURBOC__ |
| /* Turbo C in 16-bit mode */ |
| |
| # define MY_ZCALLOC |
| |
| /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
| * and farmalloc(64K) returns a pointer with an offset of 8, so we |
| * must fix the pointer. Warning: the pointer must be put back to its |
| * original form in order to free it, use zcfree(). |
| */ |
| |
| #define MAX_PTR 10 |
| /* 10*64K = 640K */ |
| |
| local int next_ptr = 0; |
| |
| typedef struct ptr_table_s { |
| voidpf org_ptr; |
| voidpf new_ptr; |
| } ptr_table; |
| |
| local ptr_table table[MAX_PTR]; |
| /* This table is used to remember the original form of pointers |
| * to large buffers (64K). Such pointers are normalized with a zero offset. |
| * Since MSDOS is not a preemptive multitasking OS, this table is not |
| * protected from concurrent access. This hack doesn't work anyway on |
| * a protected system like OS/2. Use Microsoft C instead. |
| */ |
| |
| voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) |
| { |
| voidpf buf; |
| ulg bsize = (ulg)items*size; |
| |
| (void)opaque; |
| |
| /* If we allocate less than 65520 bytes, we assume that farmalloc |
| * will return a usable pointer which doesn't have to be normalized. |
| */ |
| if (bsize < 65520L) { |
| buf = farmalloc(bsize); |
| if (*(ush*)&buf != 0) return buf; |
| } else { |
| buf = farmalloc(bsize + 16L); |
| } |
| if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
| table[next_ptr].org_ptr = buf; |
| |
| /* Normalize the pointer to seg:0 */ |
| *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
| *(ush*)&buf = 0; |
| table[next_ptr++].new_ptr = buf; |
| return buf; |
| } |
| |
| void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
| { |
| int n; |
| |
| (void)opaque; |
| |
| if (*(ush*)&ptr != 0) { /* object < 64K */ |
| farfree(ptr); |
| return; |
| } |
| /* Find the original pointer */ |
| for (n = 0; n < next_ptr; n++) { |
| if (ptr != table[n].new_ptr) continue; |
| |
| farfree(table[n].org_ptr); |
| while (++n < next_ptr) { |
| table[n-1] = table[n]; |
| } |
| next_ptr--; |
| return; |
| } |
| Assert(0, "zcfree: ptr not found"); |
| } |
| |
| #endif /* __TURBOC__ */ |
| |
| |
| #ifdef M_I86 |
| /* Microsoft C in 16-bit mode */ |
| |
| # define MY_ZCALLOC |
| |
| #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
| # define _halloc halloc |
| # define _hfree hfree |
| #endif |
| |
| voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) |
| { |
| (void)opaque; |
| return _halloc((long)items, size); |
| } |
| |
| void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
| { |
| (void)opaque; |
| _hfree(ptr); |
| } |
| |
| #endif /* M_I86 */ |
| |
| #endif /* SYS16BIT */ |
| |
| |
| #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
| |
| #ifndef STDC |
| extern voidp malloc OF((uInt size)); |
| extern voidp calloc OF((uInt items, uInt size)); |
| extern void free OF((voidpf ptr)); |
| #endif |
| |
| voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) |
| voidpf opaque; |
| unsigned items; |
| unsigned size; |
| { |
| (void)opaque; |
| return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
| (voidpf)calloc(items, size); |
| } |
| |
| void ZLIB_INTERNAL zcfree (opaque, ptr) |
| voidpf opaque; |
| voidpf ptr; |
| { |
| (void)opaque; |
| free(ptr); |
| } |
| |
| #endif /* MY_ZCALLOC */ |
| |
| #endif /* !Z_SOLO */ |