[thirdparty/openssl.git] / crypto / comp / c_zlib.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/objects.h>
#include <openssl/comp.h>

COMP_METHOD *COMP_zlib(void );

static COMP_METHOD zlib_method_nozlib={
	NID_undef,
	"(undef)",
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	};

#ifdef ZLIB

#include <zlib.h>

static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen);
static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen);

static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
	uLong sourceLen);

static COMP_METHOD zlib_method={
	NID_zlib_compression,
	LN_zlib_compression,
	NULL,
	NULL,
	zlib_compress_block,
	zlib_expand_block,
	NULL,
	};

/* 
 * When OpenSSL is built on Windows, we do not want to require that
 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
 * work.  Therefore, all ZLIB routines are loaded at run time
 * and we do not link to a .LIB file.
 */
#if defined(WINDOWS) || defined(WIN32)
#include <windows.h>

/* Prototypes for built in stubs */
int stub_compress(Bytef *dest,uLongf *destLen,
	const Bytef *source, uLong sourceLen);
int stub_inflateEnd(z_streamp strm);
int stub_inflate(z_streamp strm, int flush);
int stub_inflateInit_(z_streamp strm, const char * version, int stream_size);

/* Function pointers */
typedef int (_stdcall *compress_ft)(Bytef *dest,uLongf *destLen,
	const Bytef *source, uLong sourceLen);
typedef int (_stdcall *inflateEnd_ft)(z_streamp strm);
typedef int (_stdcall *inflate_ft)(z_streamp strm, int flush);
typedef int (_stdcall *inflateInit__ft)(z_streamp strm, const char * version,
	int stream_size);
static compress_ft p_compress=NULL;
static inflateEnd_ft p_inflateEnd=NULL;
static inflate_ft p_inflate=NULL;
static inflate_Init__ft p_inflateInit_=NULL;

static int zlib_loaded = 0;     /* only attempt to init func pts once */

#define compress                stub_compress
#define inflateEnd              stub_inflateEnd
#define inflate                 stub_inflate
#define inflateInit_            stub_inflateInit_
#endif /* WINDOWS || WIN32 */

static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
	     unsigned int olen, unsigned char *in, unsigned int ilen)
	{
	unsigned long l;
	int i;
	int clear=1;

	if (ilen > 128)
		{
		out[0]=1;
		l=olen-1;
		i=compress(&(out[1]),&l,in,(unsigned long)ilen);
		if (i != Z_OK)
			return(-1);
		if (ilen > l)
			{
			clear=0;
			l++;
			}
		}
	if (clear)
		{
		out[0]=0;
		memcpy(&(out[1]),in,ilen);
		l=ilen+1;
		}
#ifdef DEBUG_ZLIB
	fprintf(stderr,"compress(%4d)->%4d %s\n",
		ilen,(int)l,(clear)?"clear":"zlib");
#endif
	return((int)l);
	}

static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
	     unsigned int olen, unsigned char *in, unsigned int ilen)
	{
	unsigned long l;
	int i;

	if (in[0])
		{
		l=olen;
		i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
		if (i != Z_OK)
			return(-1);
		}
	else
		{
		memcpy(out,&(in[1]),ilen-1);
		l=ilen-1;
		}
#ifdef DEBUG_ZLIB
        fprintf(stderr,"expand  (%4d)->%4d %s\n",
		ilen,(int)l,in[0]?"zlib":"clear");
#endif
	return((int)l);
	}

static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
	     uLong sourceLen)
{
    z_stream stream;
    int err;

    stream.next_in = (Bytef*)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;

    err = inflateInit(&stream);
    if (err != Z_OK) return err;

    err = inflate(&stream, Z_FINISH);
    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        return err;
    }
    *destLen = stream.total_out;

    err = inflateEnd(&stream);
    return err;
}

#endif

COMP_METHOD *COMP_zlib(void)
	{
	COMP_METHOD *meth = &zlib_method_nozlib;

#ifdef ZLIB
#if defined(WINDOWS) || defined(WIN32)
	if (!zlib_method)
		{
		zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
		if (dso != NULL)
			{
			(FARPROC) p_compress
				= (compress_ft) DSO_bind_func(dso, "compress");
			(FARPROC) p_inflateEnd
				= (inflateEnd_ft) DSO_bind_func(dso, "inflateEnd");
			(FARPROC) p_inflate
				= (inflate_ft) DSO_bind_func(dso, "inflate");
			(FARPROC) p_inflateInit_
				= (inflateInit__ft) DSO_bind_func(dso, "inflateInit_");
			zlib_loaded++;
			meth = &zlib_method;
			}
		}

#else
	meth = &zlib_method;
#endif
#endif

	return(meth);
	}

#ifdef ZLIB
#if defined(WINDOWS) || defined(WIN32)
/* Stubs for each function to be dynamicly loaded */
static int 
stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
	{
	if (p_compress)
		return(p_compress(dest,destLen,source,sourceLen));
	else
		return(Z_MEM_ERROR);
	}

static int
stub_inflateEnd(z_streamp strm)
	{
	if ( p_inflateEnd )
		return(p_inflateEnd(strm));
	else
		return(Z_MEM_ERROR);
	}

static int
stub_inflate(z_streamp strm, int flush)
	{
	if ( p_inflate )
		return(p_inflate(strm,flush));
	else
		return(Z_MEM_ERROR);
	}

static int
stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
	{
	if ( p_inflateInit_ )
		return(p_inflateInit_(strm,version,stream_size));
	else
		return(Z_MEM_ERROR);
	}

#endif /* WINDOWS || WIN32 */
#endif /* ZLIB */
Commit	Line	Data
dfeab068 RE	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <string.h>
ec577822 BM	4	#include <openssl/objects.h>
ec577822 BM	5	#include <openssl/comp.h>
dfeab068 RE	6
	7	COMP_METHOD *COMP_zlib(void );
	8
20f88b9b	9	static COMP_METHOD zlib_method_nozlib={
dfeab068	10	NID_undef,
20f88b9b	11	"(undef)",
dfeab068 RE	12	NULL,
	13	NULL,
	14	NULL,
	15	NULL,
	16	NULL,
	17	};
	18
20f88b9b	19	#ifdef ZLIB
dfeab068 RE	20
	21	#include <zlib.h>
	22
	23	static int zlib_compress_block(COMP_CTX ctx, unsigned char out,
	24	unsigned int olen, unsigned char *in, unsigned int ilen);
	25	static int zlib_expand_block(COMP_CTX ctx, unsigned char out,
	26	unsigned int olen, unsigned char *in, unsigned int ilen);
	27
	28	static int zz_uncompress(Bytef dest, uLongf destLen, const Bytef *source,
	29	uLong sourceLen);
	30
	31	static COMP_METHOD zlib_method={
	32	NID_zlib_compression,
	33	LN_zlib_compression,
	34	NULL,
	35	NULL,
	36	zlib_compress_block,
	37	zlib_expand_block,
	38	NULL,
	39	};
	40
20f88b9b RL	41	/*
	42	* When OpenSSL is built on Windows, we do not want to require that
	43	* the ZLIB.DLL be available in order for the OpenSSL DLLs to
	44	* work. Therefore, all ZLIB routines are loaded at run time
	45	* and we do not link to a .LIB file.
	46	*/
	47	#if defined(WINDOWS) \|\| defined(WIN32)
	48	#include <windows.h>
	49
	50	/* Prototypes for built in stubs */
	51	int stub_compress(Bytef dest,uLongf destLen,
	52	const Bytef *source, uLong sourceLen);
	53	int stub_inflateEnd(z_streamp strm);
	54	int stub_inflate(z_streamp strm, int flush);
	55	int stub_inflateInit_(z_streamp strm, const char * version, int stream_size);
	56
	57	/* Function pointers */
	58	typedef int (_stdcall compress_ft)(Bytef dest,uLongf *destLen,
	59	const Bytef *source, uLong sourceLen);
	60	typedef int (_stdcall *inflateEnd_ft)(z_streamp strm);
	61	typedef int (_stdcall *inflate_ft)(z_streamp strm, int flush);
	62	typedef int (_stdcall inflateInit__ft)(z_streamp strm, const char version,
	63	int stream_size);
	64	static compress_ft p_compress=NULL;
	65	static inflateEnd_ft p_inflateEnd=NULL;
	66	static inflate_ft p_inflate=NULL;
	67	static inflate_Init__ft p_inflateInit_=NULL;
	68
	69	static int zlib_loaded = 0; /* only attempt to init func pts once */
	70
	71	#define compress stub_compress
	72	#define inflateEnd stub_inflateEnd
	73	#define inflate stub_inflate
	74	#define inflateInit_ stub_inflateInit_
	75	#endif /* WINDOWS \|\| WIN32 */
	76
6b691a5c UM	77	static int zlib_compress_block(COMP_CTX ctx, unsigned char out,
6b691a5c UM	78	unsigned int olen, unsigned char *in, unsigned int ilen)
dfeab068 RE	79	{
	80	unsigned long l;
	81	int i;
	82	int clear=1;
	83
	84	if (ilen > 128)
	85	{
	86	out[0]=1;
	87	l=olen-1;
	88	i=compress(&(out[1]),&l,in,(unsigned long)ilen);
	89	if (i != Z_OK)
	90	return(-1);
	91	if (ilen > l)
	92	{
	93	clear=0;
	94	l++;
	95	}
	96	}
	97	if (clear)
	98	{
	99	out[0]=0;
	100	memcpy(&(out[1]),in,ilen);
	101	l=ilen+1;
	102	}
20f88b9b RL	103	#ifdef DEBUG_ZLIB
	104	fprintf(stderr,"compress(%4d)->%4d %s\n",
	105	ilen,(int)l,(clear)?"clear":"zlib");
	106	#endif
dfeab068 RE	107	return((int)l);
	108	}
	109
6b691a5c UM	110	static int zlib_expand_block(COMP_CTX ctx, unsigned char out,
6b691a5c UM	111	unsigned int olen, unsigned char *in, unsigned int ilen)
dfeab068 RE	112	{
	113	unsigned long l;
	114	int i;
	115
	116	if (in[0])
	117	{
	118	l=olen;
	119	i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
	120	if (i != Z_OK)
	121	return(-1);
	122	}
	123	else
	124	{
	125	memcpy(out,&(in[1]),ilen-1);
	126	l=ilen-1;
	127	}
20f88b9b RL	128	#ifdef DEBUG_ZLIB
	129	fprintf(stderr,"expand (%4d)->%4d %s\n",
	130	ilen,(int)l,in[0]?"zlib":"clear");
	131	#endif
dfeab068 RE	132	return((int)l);
	133	}
	134
6b691a5c UM	135	static int zz_uncompress (Bytef dest, uLongf destLen, const Bytef *source,
6b691a5c UM	136	uLong sourceLen)
dfeab068 RE	137	{
	138	z_stream stream;
	139	int err;
	140
	141	stream.next_in = (Bytef*)source;
	142	stream.avail_in = (uInt)sourceLen;
	143	/* Check for source > 64K on 16-bit machine: */
	144	if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
	145
	146	stream.next_out = dest;
	147	stream.avail_out = (uInt)*destLen;
	148	if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
	149
	150	stream.zalloc = (alloc_func)0;
	151	stream.zfree = (free_func)0;
	152
	153	err = inflateInit(&stream);
	154	if (err != Z_OK) return err;
	155
	156	err = inflate(&stream, Z_FINISH);
	157	if (err != Z_STREAM_END) {
	158	inflateEnd(&stream);
	159	return err;
	160	}
	161	*destLen = stream.total_out;
	162
	163	err = inflateEnd(&stream);
	164	return err;
	165	}
	166
	167	#endif
	168
6b691a5c	169	COMP_METHOD *COMP_zlib(void)
dfeab068	170	{
20f88b9b RL	171	COMP_METHOD *meth = &zlib_method_nozlib;
	172
	173	#ifdef ZLIB
	174	#if defined(WINDOWS) \|\| defined(WIN32)
	175	if (!zlib_method)
	176	{
	177	zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
	178	if (dso != NULL)
	179	{
	180	(FARPROC) p_compress
	181	= (compress_ft) DSO_bind_func(dso, "compress");
	182	(FARPROC) p_inflateEnd
	183	= (inflateEnd_ft) DSO_bind_func(dso, "inflateEnd");
	184	(FARPROC) p_inflate
	185	= (inflate_ft) DSO_bind_func(dso, "inflate");
	186	(FARPROC) p_inflateInit_
	187	= (inflateInit__ft) DSO_bind_func(dso, "inflateInit_");
	188	zlib_loaded++;
	189	meth = &zlib_method;
	190	}
	191	}
	192
	193	#else
	194	meth = &zlib_method;
	195	#endif
	196	#endif
	197
	198	return(meth);
	199	}
	200
	201	#ifdef ZLIB
	202	#if defined(WINDOWS) \|\| defined(WIN32)
	203	/* Stubs for each function to be dynamicly loaded */
	204	static int
	205	stub_compress(Bytef dest,uLongf destLen,const Bytef *source, uLong sourceLen)
	206	{
	207	if (p_compress)
	208	return(p_compress(dest,destLen,source,sourceLen));
	209	else
	210	return(Z_MEM_ERROR);
	211	}
	212
	213	static int
	214	stub_inflateEnd(z_streamp strm)
	215	{
	216	if ( p_inflateEnd )
	217	return(p_inflateEnd(strm));
	218	else
	219	return(Z_MEM_ERROR);
	220	}
	221
	222	static int
	223	stub_inflate(z_streamp strm, int flush)
	224	{
	225	if ( p_inflate )
	226	return(p_inflate(strm,flush));
	227	else
	228	return(Z_MEM_ERROR);
	229	}
	230
	231	static int
	232	stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
	233	{
	234	if ( p_inflateInit_ )
235	return(p_inflateInit_(strm,version,stream_size));
236	else
237	return(Z_MEM_ERROR);
dfeab068 RE	238	}
dfeab068 RE	239
20f88b9b RL	240	#endif /* WINDOWS \|\| WIN32 */
20f88b9b RL	241	#endif /* ZLIB */