[pcsx_rearmed.git] / deps / libchdr / deps / zlib-1.3.1 / zutil.c

/* 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(void) {
    return ZLIB_VERSION;
}

uLong ZEXPORT zlibCompileFlags(void) {
    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(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(int err) {
    return ERR_MSG(err);
}

#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
    /* The older 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(Bytef* dest, const Bytef* source, uInt len) {
    if (len == 0) return;
    do {
        *dest++ = *source++; /* ??? to be unrolled */
    } while (--len != 0);
}

int ZLIB_INTERNAL zmemcmp(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(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(uInt size);
extern voidp calloc(uInt items, uInt size);
extern void free(voidpf ptr);
#endif

voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
    (void)opaque;
    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
                              (voidpf)calloc(items, size);
}

void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
    (void)opaque;
    free(ptr);
}

#endif /* MY_ZCALLOC */

#endif /* !Z_SOLO */
Commit	Line	Data
b24e7fce	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
	4	*/
	5
	6	/* @(#) $Id$ */
	7
	8	#include "zutil.h"
	9	#ifndef Z_SOLO
	10	# include "gzguts.h"
	11	#endif
	12
	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) */
	23	(z_const char *)""
	24	};
	25
	26
648db22b	27	const char * ZEXPORT zlibVersion(void) {
b24e7fce	28	return ZLIB_VERSION;
	29	}
	30
648db22b	31	uLong ZEXPORT zlibCompileFlags(void) {
b24e7fce	32	uLong flags;
	33
	34	flags = 0;
	35	switch ((int)(sizeof(uInt))) {
	36	case 2: break;
	37	case 4: flags += 1; break;
	38	case 8: flags += 2; break;
	39	default: flags += 3;
	40	}
	41	switch ((int)(sizeof(uLong))) {
	42	case 2: break;
	43	case 4: flags += 1 << 2; break;
	44	case 8: flags += 2 << 2; break;
	45	default: flags += 3 << 2;
	46	}
	47	switch ((int)(sizeof(voidpf))) {
	48	case 2: break;
	49	case 4: flags += 1 << 4; break;
	50	case 8: flags += 2 << 4; break;
	51	default: flags += 3 << 4;
	52	}
	53	switch ((int)(sizeof(z_off_t))) {
	54	case 2: break;
	55	case 4: flags += 1 << 6; break;
	56	case 8: flags += 2 << 6; break;
	57	default: flags += 3 << 6;
	58	}
	59	#ifdef ZLIB_DEBUG
	60	flags += 1 << 8;
	61	#endif
9e052883	62	/*
b24e7fce	63	#if defined(ASMV) \|\| defined(ASMINF)
	64	flags += 1 << 9;
	65	#endif
9e052883	66	*/
b24e7fce	67	#ifdef ZLIB_WINAPI
	68	flags += 1 << 10;
	69	#endif
	70	#ifdef BUILDFIXED
	71	flags += 1 << 12;
	72	#endif
	73	#ifdef DYNAMIC_CRC_TABLE
	74	flags += 1 << 13;
	75	#endif
	76	#ifdef NO_GZCOMPRESS
	77	flags += 1L << 16;
	78	#endif
	79	#ifdef NO_GZIP
	80	flags += 1L << 17;
	81	#endif
	82	#ifdef PKZIP_BUG_WORKAROUND
	83	flags += 1L << 20;
	84	#endif
	85	#ifdef FASTEST
	86	flags += 1L << 21;
	87	#endif
	88	#if defined(STDC) \|\| defined(Z_HAVE_STDARG_H)
	89	# ifdef NO_vsnprintf
	90	flags += 1L << 25;
	91	# ifdef HAS_vsprintf_void
	92	flags += 1L << 26;
	93	# endif
	94	# else
	95	# ifdef HAS_vsnprintf_void
	96	flags += 1L << 26;
	97	# endif
	98	# endif
	99	#else
	100	flags += 1L << 24;
	101	# ifdef NO_snprintf
	102	flags += 1L << 25;
	103	# ifdef HAS_sprintf_void
	104	flags += 1L << 26;
	105	# endif
	106	# else
	107	# ifdef HAS_snprintf_void
	108	flags += 1L << 26;
	109	# endif
	110	# endif
	111	#endif
	112	return flags;
	113	}
	114
	115	#ifdef ZLIB_DEBUG
	116	#include <stdlib.h>
	117	# ifndef verbose
	118	# define verbose 0
	119	# endif
	120	int ZLIB_INTERNAL z_verbose = verbose;
	121
648db22b	122	void ZLIB_INTERNAL z_error(char *m) {
b24e7fce	123	fprintf(stderr, "%s\n", m);
	124	exit(1);
	125	}
	126	#endif
	127
	128	/* exported to allow conversion of error code to string for compress() and
	129	* uncompress()
	130	*/
648db22b	131	const char * ZEXPORT zError(int err) {
b24e7fce	132	return ERR_MSG(err);
	133	}
	134
9e052883	135	#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
9e052883	136	/* The older Microsoft C Run-Time Library for Windows CE doesn't have
b24e7fce	137	* errno. We define it as a global variable to simplify porting.
	138	* Its value is always 0 and should not be used.
	139	*/
	140	int errno = 0;
	141	#endif
	142
	143	#ifndef HAVE_MEMCPY
	144
648db22b	145	void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) {
b24e7fce	146	if (len == 0) return;
	147	do {
	148	dest++ = source++; /* ??? to be unrolled */
	149	} while (--len != 0);
	150	}
	151
648db22b	152	int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) {
b24e7fce	153	uInt j;
	154
	155	for (j = 0; j < len; j++) {
	156	if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
	157	}
	158	return 0;
	159	}
	160
648db22b	161	void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) {
b24e7fce	162	if (len == 0) return;
	163	do {
	164	dest++ = 0; / ??? to be unrolled */
	165	} while (--len != 0);
	166	}
	167	#endif
	168
	169	#ifndef Z_SOLO
	170
	171	#ifdef SYS16BIT
	172
	173	#ifdef __TURBOC__
	174	/* Turbo C in 16-bit mode */
	175
	176	# define MY_ZCALLOC
	177
	178	/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
	179	* and farmalloc(64K) returns a pointer with an offset of 8, so we
	180	* must fix the pointer. Warning: the pointer must be put back to its
	181	* original form in order to free it, use zcfree().
	182	*/
	183
	184	#define MAX_PTR 10
	185	/* 1064K = 640K /
	186
	187	local int next_ptr = 0;
	188
	189	typedef struct ptr_table_s {
	190	voidpf org_ptr;
	191	voidpf new_ptr;
	192	} ptr_table;
	193
	194	local ptr_table table[MAX_PTR];
	195	/* This table is used to remember the original form of pointers
	196	* to large buffers (64K). Such pointers are normalized with a zero offset.
	197	* Since MSDOS is not a preemptive multitasking OS, this table is not
	198	* protected from concurrent access. This hack doesn't work anyway on
	199	* a protected system like OS/2. Use Microsoft C instead.
	200	*/
	201
648db22b	202	voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
b24e7fce	203	voidpf buf;
	204	ulg bsize = (ulg)items*size;
	205
	206	(void)opaque;
	207
	208	/* If we allocate less than 65520 bytes, we assume that farmalloc
	209	* will return a usable pointer which doesn't have to be normalized.
	210	*/
	211	if (bsize < 65520L) {
	212	buf = farmalloc(bsize);
	213	if ((ush)&buf != 0) return buf;
	214	} else {
	215	buf = farmalloc(bsize + 16L);
	216	}
	217	if (buf == NULL \|\| next_ptr >= MAX_PTR) return NULL;
	218	table[next_ptr].org_ptr = buf;
	219
	220	/* Normalize the pointer to seg:0 */
	221	((ush)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
	222	(ush)&buf = 0;
	223	table[next_ptr++].new_ptr = buf;
	224	return buf;
	225	}
	226
648db22b	227	void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
b24e7fce	228	int n;
	229
	230	(void)opaque;
	231
	232	if ((ush)&ptr != 0) { /* object < 64K */
	233	farfree(ptr);
	234	return;
	235	}
	236	/* Find the original pointer */
	237	for (n = 0; n < next_ptr; n++) {
	238	if (ptr != table[n].new_ptr) continue;
	239
	240	farfree(table[n].org_ptr);
	241	while (++n < next_ptr) {
	242	table[n-1] = table[n];
	243	}
	244	next_ptr--;
	245	return;
	246	}
	247	Assert(0, "zcfree: ptr not found");
	248	}
	249
	250	#endif /* __TURBOC__ */
	251
	252
	253	#ifdef M_I86
	254	/* Microsoft C in 16-bit mode */
	255
	256	# define MY_ZCALLOC
	257
	258	#if (!defined(_MSC_VER) \|\| (_MSC_VER <= 600))
	259	# define _halloc halloc
	260	# define _hfree hfree
	261	#endif
	262
648db22b	263	voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) {
b24e7fce	264	(void)opaque;
	265	return _halloc((long)items, size);
	266	}
	267
648db22b	268	void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
b24e7fce	269	(void)opaque;
	270	_hfree(ptr);
	271	}
	272
	273	#endif /* M_I86 */
	274
	275	#endif /* SYS16BIT */
	276
	277
	278	#ifndef MY_ZCALLOC /* Any system without a special alloc function */
	279
	280	#ifndef STDC
648db22b	281	extern voidp malloc(uInt size);
	282	extern voidp calloc(uInt items, uInt size);
	283	extern void free(voidpf ptr);
b24e7fce	284	#endif
b24e7fce	285
648db22b	286	voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
b24e7fce	287	(void)opaque;
	288	return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
	289	(voidpf)calloc(items, size);
	290	}
	291
648db22b	292	void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
b24e7fce	293	(void)opaque;
	294	free(ptr);
	295	}
	296
	297	#endif /* MY_ZCALLOC */
	298
	299	#endif /* !Z_SOLO */