[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>
#include <openssl/err.h>

COMP_METHOD *COMP_zlib(void );

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

#ifndef ZLIB
#undef ZLIB_SHARED
#else

#include <zlib.h>

static int zlib_stateful_init(COMP_CTX *ctx);
static void zlib_stateful_finish(COMP_CTX *ctx);
static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen);
static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen);

#if 0
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_stateless_method={
	NID_zlib_compression,
	LN_zlib_compression,
	NULL,
	NULL,
	zlib_compress_block,
	zlib_expand_block,
	NULL,
	NULL,
	};
#endif

static COMP_METHOD zlib_stateful_method={
	NID_zlib_compression,
	LN_zlib_compression,
	zlib_stateful_init,
	zlib_stateful_finish,
	zlib_stateful_compress_block,
	zlib_stateful_expand_block,
	NULL,
	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 when ZLIB_SHARED is set.
 */
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
# include <windows.h>
#endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */

#ifdef ZLIB_SHARED
#include <openssl/dso.h>

/* Function pointers */
typedef int (*compress_ft)(Bytef *dest,uLongf *destLen,
	const Bytef *source, uLong sourceLen);
typedef int (*inflateEnd_ft)(z_streamp strm);
typedef int (*inflate_ft)(z_streamp strm, int flush);
typedef int (*inflateInit__ft)(z_streamp strm,
	const char * version, int stream_size);
typedef int (*deflateEnd_ft)(z_streamp strm);
typedef int (*deflate_ft)(z_streamp strm, int flush);
typedef int (*deflateInit__ft)(z_streamp strm, int level,
	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 inflateInit__ft	p_inflateInit_=NULL;
static deflateEnd_ft	p_deflateEnd=NULL;
static deflate_ft	p_deflate=NULL;
static deflateInit__ft	p_deflateInit_=NULL;

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

#define compress                p_compress
#define inflateEnd              p_inflateEnd
#define inflate                 p_inflate
#define inflateInit_            p_inflateInit_
#define deflateEnd              p_deflateEnd
#define deflate                 p_deflate
#define deflateInit_            p_deflateInit_
#endif /* ZLIB_SHARED */

struct zlib_state
	{
	z_stream istream;
	z_stream ostream;
	};

static int zlib_stateful_ex_idx = -1;

static void zlib_stateful_free_ex_data(void *obj, void *item,
	CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
	{
	struct zlib_state *state = (struct zlib_state *)item;
	inflateEnd(&state->istream);
	deflateEnd(&state->ostream);
	OPENSSL_free(state);
	}

static int zlib_stateful_init(COMP_CTX *ctx)
	{
	int err;
	struct zlib_state *state =
		(struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));

	if (state == NULL)
		goto err;

	state->istream.zalloc = Z_NULL;
	state->istream.zfree = Z_NULL;
	state->istream.opaque = Z_NULL;
	state->istream.next_in = Z_NULL;
	state->istream.next_out = Z_NULL;
	state->istream.avail_in = 0;
	state->istream.avail_out = 0;
	err = inflateInit_(&state->istream,
		ZLIB_VERSION, sizeof(z_stream));
	if (err != Z_OK)
		goto err;

	state->ostream.zalloc = Z_NULL;
	state->ostream.zfree = Z_NULL;
	state->ostream.opaque = Z_NULL;
	state->ostream.next_in = Z_NULL;
	state->ostream.next_out = Z_NULL;
	state->ostream.avail_in = 0;
	state->ostream.avail_out = 0;
	err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
		ZLIB_VERSION, sizeof(z_stream));
	if (err != Z_OK)
		goto err;

	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
	if (zlib_stateful_ex_idx == -1)
		{
		CRYPTO_w_lock(CRYPTO_LOCK_COMP);
		if (zlib_stateful_ex_idx == -1)
			zlib_stateful_ex_idx =
				CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
					0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
		CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
		if (zlib_stateful_ex_idx == -1)
			goto err;
		}
	CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
	return 1;
 err:
	if (state) OPENSSL_free(state);
	return 0;
	}

static void zlib_stateful_finish(COMP_CTX *ctx)
	{
	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
	}

static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen)
	{
	int err = Z_OK;
	struct zlib_state *state =
		(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
			zlib_stateful_ex_idx);

	if (state == NULL)
		return -1;

	state->ostream.next_in = in;
	state->ostream.avail_in = ilen;
	state->ostream.next_out = out;
	state->ostream.avail_out = olen;
	if (ilen > 0)
		err = deflate(&state->ostream, Z_SYNC_FLUSH);
	if (err != Z_OK)
		return -1;
#ifdef DEBUG_ZLIB
	fprintf(stderr,"compress(%4d)->%4d %s\n",
		ilen,olen - state->ostream.avail_out,
		(ilen != olen - state->ostream.avail_out)?"zlib":"clear");
#endif
	return olen - state->ostream.avail_out;
	}

static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen)
	{
	int err = Z_OK;

	struct zlib_state *state =
		(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
			zlib_stateful_ex_idx);

	if (state == NULL)
		return 0;

	state->istream.next_in = in;
	state->istream.avail_in = ilen;
	state->istream.next_out = out;
	state->istream.avail_out = olen;
	if (ilen > 0)
		err = inflate(&state->istream, Z_SYNC_FLUSH);
	if (err != Z_OK)
		return -1;
#ifdef DEBUG_ZLIB
	fprintf(stderr,"expand(%4d)->%4d %s\n",
		ilen,olen - state->istream.avail_out,
		(ilen != olen - state->istream.avail_out)?"zlib":"clear");
#endif
	return olen - state->istream.avail_out;
	}

#if 0
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,
	    ZLIB_VERSION, sizeof(z_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

#endif

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

#ifdef ZLIB_SHARED
	if (!zlib_loaded)
		{
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
		zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
#else
		zlib_dso = DSO_load(NULL, "z", NULL, 0);
#endif
		if (zlib_dso != NULL)
			{
			p_compress
				= (compress_ft) DSO_bind_func(zlib_dso,
					"compress");
			p_inflateEnd
				= (inflateEnd_ft) DSO_bind_func(zlib_dso,
					"inflateEnd");
			p_inflate
				= (inflate_ft) DSO_bind_func(zlib_dso,
					"inflate");
			p_inflateInit_
				= (inflateInit__ft) DSO_bind_func(zlib_dso,
					"inflateInit_");
			p_deflateEnd
				= (deflateEnd_ft) DSO_bind_func(zlib_dso,
					"deflateEnd");
			p_deflate
				= (deflate_ft) DSO_bind_func(zlib_dso,
					"deflate");
			p_deflateInit_
				= (deflateInit__ft) DSO_bind_func(zlib_dso,
					"deflateInit_");

			if (p_compress && p_inflateEnd && p_inflate
				&& p_inflateInit_ && p_deflateEnd
				&& p_deflate && p_deflateInit_)
				zlib_loaded++;
			}
		}

#endif
#ifdef ZLIB_SHARED
	if (zlib_loaded)
#endif
#if defined(ZLIB) || defined(ZLIB_SHARED)
		meth = &zlib_stateful_method;
#endif

	return(meth);
	}
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>
bdbc9b4d	6	#include <openssl/err.h>
dfeab068 RE	7
	8	COMP_METHOD *COMP_zlib(void );
	9
20f88b9b	10	static COMP_METHOD zlib_method_nozlib={
dfeab068	11	NID_undef,
20f88b9b	12	"(undef)",
dfeab068 RE	13	NULL,
	14	NULL,
	15	NULL,
	16	NULL,
	17	NULL,
a4614bf0	18	NULL,
dfeab068 RE	19	};
dfeab068 RE	20
c4438dc0 RL	21	#ifndef ZLIB
	22	#undef ZLIB_SHARED
	23	#else
dfeab068 RE	24
	25	#include <zlib.h>
	26
86a62cf1 RL	27	static int zlib_stateful_init(COMP_CTX *ctx);
	28	static void zlib_stateful_finish(COMP_CTX *ctx);
	29	static int zlib_stateful_compress_block(COMP_CTX ctx, unsigned char out,
	30	unsigned int olen, unsigned char *in, unsigned int ilen);
	31	static int zlib_stateful_expand_block(COMP_CTX ctx, unsigned char out,
	32	unsigned int olen, unsigned char *in, unsigned int ilen);
	33
6895cca8	34	#if 0
dfeab068 RE	35	static int zlib_compress_block(COMP_CTX ctx, unsigned char out,
	36	unsigned int olen, unsigned char *in, unsigned int ilen);
	37	static int zlib_expand_block(COMP_CTX ctx, unsigned char out,
	38	unsigned int olen, unsigned char *in, unsigned int ilen);
	39
	40	static int zz_uncompress(Bytef dest, uLongf destLen, const Bytef *source,
	41	uLong sourceLen);
	42
86a62cf1	43	static COMP_METHOD zlib_stateless_method={
dfeab068 RE	44	NID_zlib_compression,
	45	LN_zlib_compression,
	46	NULL,
	47	NULL,
	48	zlib_compress_block,
	49	zlib_expand_block,
	50	NULL,
a4614bf0	51	NULL,
dfeab068	52	};
6895cca8	53	#endif
dfeab068	54
86a62cf1 RL	55	static COMP_METHOD zlib_stateful_method={
	56	NID_zlib_compression,
	57	LN_zlib_compression,
	58	zlib_stateful_init,
	59	zlib_stateful_finish,
	60	zlib_stateful_compress_block,
	61	zlib_stateful_expand_block,
	62	NULL,
	63	NULL,
	64	};
	65
20f88b9b RL	66	/*
	67	* When OpenSSL is built on Windows, we do not want to require that
	68	* the ZLIB.DLL be available in order for the OpenSSL DLLs to
	69	* work. Therefore, all ZLIB routines are loaded at run time
ad2695b1	70	* and we do not link to a .LIB file when ZLIB_SHARED is set.
20f88b9b	71	*/
bc36ee62	72	#if defined(OPENSSL_SYS_WINDOWS) \|\| defined(OPENSSL_SYS_WIN32)
c4438dc0	73	# include <windows.h>
bc36ee62	74	#endif /* !(OPENSSL_SYS_WINDOWS \|\| OPENSSL_SYS_WIN32) */
c4438dc0 RL	75
	76	#ifdef ZLIB_SHARED
	77	#include <openssl/dso.h>
20f88b9b	78
20f88b9b	79	/* Function pointers */
ad2695b1	80	typedef int (compress_ft)(Bytef dest,uLongf *destLen,
20f88b9b	81	const Bytef *source, uLong sourceLen);
ad2695b1 DSH	82	typedef int (*inflateEnd_ft)(z_streamp strm);
	83	typedef int (*inflate_ft)(z_streamp strm, int flush);
	84	typedef int (*inflateInit__ft)(z_streamp strm,
c4438dc0	85	const char * version, int stream_size);
ad2695b1 DSH	86	typedef int (*deflateEnd_ft)(z_streamp strm);
	87	typedef int (*deflate_ft)(z_streamp strm, int flush);
	88	typedef int (*deflateInit__ft)(z_streamp strm, int level,
86a62cf1	89	const char * version, int stream_size);
c4438dc0 RL	90	static compress_ft p_compress=NULL;
	91	static inflateEnd_ft p_inflateEnd=NULL;
	92	static inflate_ft p_inflate=NULL;
	93	static inflateInit__ft p_inflateInit_=NULL;
86a62cf1 RL	94	static deflateEnd_ft p_deflateEnd=NULL;
	95	static deflate_ft p_deflate=NULL;
	96	static deflateInit__ft p_deflateInit_=NULL;
20f88b9b RL	97
20f88b9b RL	98	static int zlib_loaded = 0; /* only attempt to init func pts once */
c4438dc0	99	static DSO *zlib_dso = NULL;
20f88b9b	100
ad2695b1 DSH	101	#define compress p_compress
	102	#define inflateEnd p_inflateEnd
	103	#define inflate p_inflate
	104	#define inflateInit_ p_inflateInit_
	105	#define deflateEnd p_deflateEnd
	106	#define deflate p_deflate
	107	#define deflateInit_ p_deflateInit_
c4438dc0	108	#endif /* ZLIB_SHARED */
20f88b9b	109
86a62cf1 RL	110	struct zlib_state
	111	{
	112	z_stream istream;
	113	z_stream ostream;
	114	};
	115
	116	static int zlib_stateful_ex_idx = -1;
	117
	118	static void zlib_stateful_free_ex_data(void obj, void item,
	119	CRYPTO_EX_DATA ad, int ind,long argl, void argp)
	120	{
	121	struct zlib_state state = (struct zlib_state )item;
	122	inflateEnd(&state->istream);
	123	deflateEnd(&state->ostream);
	124	OPENSSL_free(state);
	125	}
	126
	127	static int zlib_stateful_init(COMP_CTX *ctx)
	128	{
	129	int err;
	130	struct zlib_state *state =
	131	(struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
	132
	133	if (state == NULL)
	134	goto err;
	135
	136	state->istream.zalloc = Z_NULL;
	137	state->istream.zfree = Z_NULL;
	138	state->istream.opaque = Z_NULL;
	139	state->istream.next_in = Z_NULL;
	140	state->istream.next_out = Z_NULL;
	141	state->istream.avail_in = 0;
	142	state->istream.avail_out = 0;
6895cca8 RL	143	err = inflateInit_(&state->istream,
6895cca8 RL	144	ZLIB_VERSION, sizeof(z_stream));
86a62cf1 RL	145	if (err != Z_OK)
	146	goto err;
	147
	148	state->ostream.zalloc = Z_NULL;
	149	state->ostream.zfree = Z_NULL;
	150	state->ostream.opaque = Z_NULL;
	151	state->ostream.next_in = Z_NULL;
	152	state->ostream.next_out = Z_NULL;
	153	state->ostream.avail_in = 0;
	154	state->ostream.avail_out = 0;
6895cca8 RL	155	err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
6895cca8 RL	156	ZLIB_VERSION, sizeof(z_stream));
86a62cf1 RL	157	if (err != Z_OK)
	158	goto err;
	159
	160	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
	161	if (zlib_stateful_ex_idx == -1)
	162	{
c40b9bde RL	163	CRYPTO_w_lock(CRYPTO_LOCK_COMP);
	164	if (zlib_stateful_ex_idx == -1)
	165	zlib_stateful_ex_idx =
	166	CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
	167	0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
	168	CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
86a62cf1 RL	169	if (zlib_stateful_ex_idx == -1)
	170	goto err;
	171	}
	172	CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
	173	return 1;
	174	err:
	175	if (state) OPENSSL_free(state);
	176	return 0;
	177	}
	178
	179	static void zlib_stateful_finish(COMP_CTX *ctx)
	180	{
	181	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
	182	}
	183
	184	static int zlib_stateful_compress_block(COMP_CTX ctx, unsigned char out,
	185	unsigned int olen, unsigned char *in, unsigned int ilen)
	186	{
	187	int err = Z_OK;
	188	struct zlib_state *state =
	189	(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
	190	zlib_stateful_ex_idx);
	191
	192	if (state == NULL)
	193	return -1;
	194
	195	state->ostream.next_in = in;
	196	state->ostream.avail_in = ilen;
	197	state->ostream.next_out = out;
	198	state->ostream.avail_out = olen;
	199	if (ilen > 0)
	200	err = deflate(&state->ostream, Z_SYNC_FLUSH);
	201	if (err != Z_OK)
	202	return -1;
8228f302 RL	203	#ifdef DEBUG_ZLIB
	204	fprintf(stderr,"compress(%4d)->%4d %s\n",
	205	ilen,olen - state->ostream.avail_out,
	206	(ilen != olen - state->ostream.avail_out)?"zlib":"clear");
	207	#endif
86a62cf1 RL	208	return olen - state->ostream.avail_out;
	209	}
	210
	211	static int zlib_stateful_expand_block(COMP_CTX ctx, unsigned char out,
	212	unsigned int olen, unsigned char *in, unsigned int ilen)
	213	{
	214	int err = Z_OK;
	215
	216	struct zlib_state *state =
	217	(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
	218	zlib_stateful_ex_idx);
	219
	220	if (state == NULL)
	221	return 0;
	222
	223	state->istream.next_in = in;
	224	state->istream.avail_in = ilen;
	225	state->istream.next_out = out;
	226	state->istream.avail_out = olen;
	227	if (ilen > 0)
	228	err = inflate(&state->istream, Z_SYNC_FLUSH);
	229	if (err != Z_OK)
	230	return -1;
8228f302 RL	231	#ifdef DEBUG_ZLIB
	232	fprintf(stderr,"expand(%4d)->%4d %s\n",
	233	ilen,olen - state->istream.avail_out,
	234	(ilen != olen - state->istream.avail_out)?"zlib":"clear");
	235	#endif
86a62cf1 RL	236	return olen - state->istream.avail_out;
	237	}
	238
6895cca8	239	#if 0
6b691a5c	240	static int zlib_compress_block(COMP_CTX ctx, unsigned char out,
86a62cf1	241	unsigned int olen, unsigned char *in, unsigned int ilen)
dfeab068 RE	242	{
	243	unsigned long l;
	244	int i;
	245	int clear=1;
	246
	247	if (ilen > 128)
	248	{
	249	out[0]=1;
	250	l=olen-1;
	251	i=compress(&(out[1]),&l,in,(unsigned long)ilen);
	252	if (i != Z_OK)
	253	return(-1);
	254	if (ilen > l)
	255	{
	256	clear=0;
	257	l++;
	258	}
	259	}
	260	if (clear)
	261	{
	262	out[0]=0;
	263	memcpy(&(out[1]),in,ilen);
	264	l=ilen+1;
	265	}
20f88b9b RL	266	#ifdef DEBUG_ZLIB
	267	fprintf(stderr,"compress(%4d)->%4d %s\n",
	268	ilen,(int)l,(clear)?"clear":"zlib");
	269	#endif
dfeab068 RE	270	return((int)l);
	271	}
	272
6b691a5c	273	static int zlib_expand_block(COMP_CTX ctx, unsigned char out,
86a62cf1	274	unsigned int olen, unsigned char *in, unsigned int ilen)
dfeab068 RE	275	{
	276	unsigned long l;
	277	int i;
	278
	279	if (in[0])
	280	{
	281	l=olen;
	282	i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
	283	if (i != Z_OK)
	284	return(-1);
	285	}
	286	else
	287	{
	288	memcpy(out,&(in[1]),ilen-1);
	289	l=ilen-1;
	290	}
20f88b9b RL	291	#ifdef DEBUG_ZLIB
	292	fprintf(stderr,"expand (%4d)->%4d %s\n",
	293	ilen,(int)l,in[0]?"zlib":"clear");
	294	#endif
dfeab068 RE	295	return((int)l);
	296	}
	297
6b691a5c UM	298	static int zz_uncompress (Bytef dest, uLongf destLen, const Bytef *source,
6b691a5c UM	299	uLong sourceLen)
dfeab068 RE	300	{
	301	z_stream stream;
	302	int err;
	303
	304	stream.next_in = (Bytef*)source;
	305	stream.avail_in = (uInt)sourceLen;
	306	/* Check for source > 64K on 16-bit machine: */
	307	if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
	308
	309	stream.next_out = dest;
	310	stream.avail_out = (uInt)*destLen;
	311	if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
	312
	313	stream.zalloc = (alloc_func)0;
	314	stream.zfree = (free_func)0;
	315
6895cca8 RL	316	err = inflateInit_(&stream,
6895cca8 RL	317	ZLIB_VERSION, sizeof(z_stream));
dfeab068 RE	318	if (err != Z_OK) return err;
	319
	320	err = inflate(&stream, Z_FINISH);
	321	if (err != Z_STREAM_END) {
	322	inflateEnd(&stream);
	323	return err;
	324	}
	325	*destLen = stream.total_out;
	326
	327	err = inflateEnd(&stream);
	328	return err;
	329	}
6895cca8	330	#endif
dfeab068 RE	331
	332	#endif
	333
6b691a5c	334	COMP_METHOD *COMP_zlib(void)
dfeab068	335	{
20f88b9b RL	336	COMP_METHOD *meth = &zlib_method_nozlib;
20f88b9b RL	337
c4438dc0 RL	338	#ifdef ZLIB_SHARED
c4438dc0 RL	339	if (!zlib_loaded)
20f88b9b	340	{
bc36ee62	341	#if defined(OPENSSL_SYS_WINDOWS) \|\| defined(OPENSSL_SYS_WIN32)
5b0f1f7d	342	zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
c4438dc0 RL	343	#else
	344	zlib_dso = DSO_load(NULL, "z", NULL, 0);
	345	#endif
	346	if (zlib_dso != NULL)
20f88b9b	347	{
c4438dc0 RL	348	p_compress
	349	= (compress_ft) DSO_bind_func(zlib_dso,
	350	"compress");
	351	p_inflateEnd
	352	= (inflateEnd_ft) DSO_bind_func(zlib_dso,
	353	"inflateEnd");
	354	p_inflate
	355	= (inflate_ft) DSO_bind_func(zlib_dso,
	356	"inflate");
	357	p_inflateInit_
	358	= (inflateInit__ft) DSO_bind_func(zlib_dso,
	359	"inflateInit_");
86a62cf1 RL	360	p_deflateEnd
	361	= (deflateEnd_ft) DSO_bind_func(zlib_dso,
	362	"deflateEnd");
	363	p_deflate
	364	= (deflate_ft) DSO_bind_func(zlib_dso,
	365	"deflate");
	366	p_deflateInit_
	367	= (deflateInit__ft) DSO_bind_func(zlib_dso,
	368	"deflateInit_");
da5a0e87 DSH	369
	370	if (p_compress && p_inflateEnd && p_inflate
	371	&& p_inflateInit_ && p_deflateEnd
	372	&& p_deflate && p_deflateInit_)
	373	zlib_loaded++;
20f88b9b RL	374	}
	375	}
	376
e984b2af	377	#endif
0d894c9d	378	#ifdef ZLIB_SHARED
da5a0e87	379	if (zlib_loaded)
0d894c9d DSH	380	#endif
0d894c9d DSH	381	#if defined(ZLIB) \|\| defined(ZLIB_SHARED)
da5a0e87	382	meth = &zlib_stateful_method;
20f88b9b RL	383	#endif
	384
	385	return(meth);
	386	}
	387