X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fcomp%2Fc_zlib.c;h=8adf35f3fc9cfcdc52b7651358a51b8d81983f19;hp=35ab0c63dc73fe35446a063c22186b0210c3c7dd;hb=8cfe08b4ec0467dc2a30a9794786e95f899cf889;hpb=dfeab0689f69c0b4bd3480ffd37a9cacc2f17d9c

diff --git a/crypto/comp/c_zlib.c b/crypto/comp/c_zlib.c
index 35ab0c63dc..8adf35f3fc 100644
--- a/crypto/comp/c_zlib.c
+++ b/crypto/comp/c_zlib.c
@@ -1,16 +1,16 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "objects.h"
-#include "comp.h"
+#include <openssl/objects.h>
+#include <openssl/comp.h>
+#include <openssl/err.h>
 
 COMP_METHOD *COMP_zlib(void );
 
-#ifndef ZLIB
-
-static COMP_METHOD zlib_method={
+static COMP_METHOD zlib_method_nozlib={
 	NID_undef,
-	"(null)",
+	"(undef)",
+	NULL,
 	NULL,
 	NULL,
 	NULL,
@@ -18,10 +18,38 @@ static COMP_METHOD zlib_method={
 	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);
+
+
+/* memory allocations functions for zlib intialization */
+static void* zlib_zalloc(void* opaque, unsigned int no, unsigned int size)
+{
+	void *p;
+	
+	p=OPENSSL_malloc(no*size);
+	if (p)
+		memset(p, 0, no*size);
+	return p;
+}
+
+
+static void zlib_zfree(void* opaque, void* address)
+{
+	OPENSSL_free(address);
+}
+
+#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,
@@ -30,7 +58,7 @@ static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
 	uLong sourceLen);
 
-static COMP_METHOD zlib_method={
+static COMP_METHOD zlib_stateless_method={
 	NID_zlib_compression,
 	LN_zlib_compression,
 	NULL,
@@ -38,14 +66,186 @@ static COMP_METHOD zlib_method={
 	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,
 	};
 
-static int zlib_compress_block(ctx,out,olen,in,ilen)
-COMP_CTX *ctx;
-unsigned char *out;
-unsigned int olen;
-unsigned char *in;
-unsigned int ilen;
+/* 
+ * 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);
+typedef const char * (*zError__ft)(int err);
+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 zError__ft	p_zError=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_
+#define zError			p_zError
+#endif /* ZLIB_SHARED */
+
+struct zlib_state
+	{
+	z_stream istream;
+	z_stream ostream;
+	};
+
+static int zlib_stateful_ex_idx = -1;
+
+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 = zlib_zalloc;
+	state->istream.zfree = zlib_zfree;
+	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 = zlib_zalloc;
+	state->ostream.zfree = zlib_zfree;
+	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);
+	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)
+	{
+	struct zlib_state *state =
+		(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
+			zlib_stateful_ex_idx);
+	inflateEnd(&state->istream);
+	deflateEnd(&state->ostream);
+	OPENSSL_free(state);
+	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;
@@ -70,16 +270,15 @@ unsigned int ilen;
 		memcpy(&(out[1]),in,ilen);
 		l=ilen+1;
 		}
-fprintf(stderr,"compress(%4d)->%4d %s\n",ilen,(int)l,(clear)?"clear":"zlib");
+#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(ctx,out,olen,in,ilen)
-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)
 	{
 	unsigned long l;
 	int i;
@@ -96,15 +295,15 @@ unsigned int ilen;
 		memcpy(out,&(in[1]),ilen-1);
 		l=ilen-1;
 		}
-        fprintf(stderr,"expand  (%4d)->%4d %s\n",ilen,(int)l,in[0]?"zlib":"clear");
+#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 (dest, destLen, source, sourceLen)
-    Bytef *dest;
-    uLongf *destLen;
-    const Bytef *source;
-    uLong sourceLen;
+static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
+	     uLong sourceLen)
 {
     z_stream stream;
     int err;
@@ -121,7 +320,8 @@ static int zz_uncompress (dest, destLen, source, sourceLen)
     stream.zalloc = (alloc_func)0;
     stream.zfree = (free_func)0;
 
-    err = inflateInit(&stream);
+    err = inflateInit_(&stream,
+	    ZLIB_VERSION, sizeof(z_stream));
     if (err != Z_OK) return err;
 
     err = inflate(&stream, Z_FINISH);
@@ -134,11 +334,466 @@ static int zz_uncompress (dest, destLen, source, sourceLen)
     err = inflateEnd(&stream);
     return err;
 }
+#endif
 
 #endif
 
-COMP_METHOD *COMP_zlib()
+COMP_METHOD *COMP_zlib(void)
 	{
-	return(&zlib_method);
+	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_");
+			p_zError
+				= (zError__ft) DSO_bind_func(zlib_dso,
+					"zError");
+
+			if (p_compress && p_inflateEnd && p_inflate
+				&& p_inflateInit_ && p_deflateEnd
+				&& p_deflate && p_deflateInit_ && p_zError)
+				zlib_loaded++;
+			}
+		}
+
+#endif
+#ifdef ZLIB_SHARED
+	if (zlib_loaded)
+#endif
+#if defined(ZLIB) || defined(ZLIB_SHARED)
+		{
+		/* init zlib_stateful_ex_idx here so that in a multi-process
+		 * application it's enough to intialize openssl before forking
+		 * (idx will be inherited in all the children) */
+		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,NULL);
+			CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
+			if (zlib_stateful_ex_idx == -1)
+				goto err;
+			}
+		
+		meth = &zlib_stateful_method;
+		}
+err:	
+#endif
+
+	return(meth);
+	}
+
+void COMP_zlib_cleanup(void)
+	{
+#ifdef ZLIB_SHARED
+	if (zlib_dso)
+		DSO_free(zlib_dso);
+#endif
 	}
 
+#ifdef ZLIB
+
+/* Zlib based compression/decompression filter BIO */
+
+typedef struct
+	{
+	unsigned char *ibuf;	/* Input buffer */
+	int ibufsize;		/* Buffer size */
+	z_stream zin;		/* Input decompress context */
+	unsigned char *obuf;	/* Output buffer */
+	int obufsize;		/* Output buffer size */
+	unsigned char *optr;	/* Position in output buffer */
+	int ocount;		/* Amount of data in output buffer */
+	int odone;		/* deflate EOF */
+	int comp_level;		/* Compression level to use */
+	z_stream zout;		/* Output compression context */
+	} BIO_ZLIB_CTX;
+
+#define ZLIB_DEFAULT_BUFSIZE 1024
+
+static int bio_zlib_new(BIO *bi);
+static int bio_zlib_free(BIO *bi);
+static int bio_zlib_read(BIO *b, char *out, int outl);
+static int bio_zlib_write(BIO *b, const char *in, int inl);
+static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
+static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
+
+static BIO_METHOD bio_meth_zlib = 
+	{
+	BIO_TYPE_COMP,
+	"zlib",
+	bio_zlib_write,
+	bio_zlib_read,
+	NULL,
+	NULL,
+	bio_zlib_ctrl,
+	bio_zlib_new,
+	bio_zlib_free,
+	bio_zlib_callback_ctrl
+	};
+
+BIO_METHOD *BIO_f_zlib(void)
+	{
+	return &bio_meth_zlib;
+	}
+
+
+static int bio_zlib_new(BIO *bi)
+	{
+	BIO_ZLIB_CTX *ctx;
+#ifdef ZLIB_SHARED
+	(void)COMP_zlib();
+	if (!zlib_loaded)
+		{
+		COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
+		return 0;
+		}
+#endif
+	ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
+	if(!ctx)
+		{
+		COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
+		return 0;
+		}
+	ctx->ibuf = NULL;
+	ctx->obuf = NULL;
+	ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
+	ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
+	ctx->zin.zalloc = Z_NULL;
+	ctx->zin.zfree = Z_NULL;
+	ctx->zin.next_in = NULL;
+	ctx->zin.avail_in = 0;
+	ctx->zin.next_out = NULL;
+	ctx->zin.avail_out = 0;
+	ctx->zout.zalloc = Z_NULL;
+	ctx->zout.zfree = Z_NULL;
+	ctx->zout.next_in = NULL;
+	ctx->zout.avail_in = 0;
+	ctx->zout.next_out = NULL;
+	ctx->zout.avail_out = 0;
+	ctx->odone = 0;
+	ctx->comp_level = Z_DEFAULT_COMPRESSION;
+	bi->init = 1;
+	bi->ptr = (char *)ctx;
+	bi->flags = 0;
+	return 1;
+	}
+
+static int bio_zlib_free(BIO *bi)
+	{
+	BIO_ZLIB_CTX *ctx;
+	if(!bi) return 0;
+	ctx = (BIO_ZLIB_CTX *)bi->ptr;
+	if(ctx->ibuf)
+		{
+		/* Destroy decompress context */
+		inflateEnd(&ctx->zin);
+		OPENSSL_free(ctx->ibuf);
+		}
+	if(ctx->obuf)
+		{
+		/* Destroy compress context */
+		deflateEnd(&ctx->zout);
+		OPENSSL_free(ctx->obuf);
+		}
+	OPENSSL_free(ctx);
+	bi->ptr = NULL;
+	bi->init = 0;
+	bi->flags = 0;
+	return 1;
+	}
+
+static int bio_zlib_read(BIO *b, char *out, int outl)
+	{
+	BIO_ZLIB_CTX *ctx;
+	int ret;
+	z_stream *zin;
+	if(!out || !outl) return 0;
+	ctx = (BIO_ZLIB_CTX *)b->ptr;
+	zin = &ctx->zin;
+	BIO_clear_retry_flags(b);
+	if(!ctx->ibuf)
+		{
+		ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
+		if(!ctx->ibuf)
+			{
+			COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
+			return 0;
+			}
+		inflateInit(zin);
+		zin->next_in = ctx->ibuf;
+		zin->avail_in = 0;
+		}
+
+	/* Copy output data directly to supplied buffer */
+	zin->next_out = (unsigned char *)out;
+	zin->avail_out = (unsigned int)outl;
+	for(;;)
+		{
+		/* Decompress while data available */
+		while(zin->avail_in)
+			{
+			ret = inflate(zin, 0);
+			if((ret != Z_OK) && (ret != Z_STREAM_END))
+				{
+				COMPerr(COMP_F_BIO_ZLIB_READ,
+						COMP_R_ZLIB_INFLATE_ERROR);
+				ERR_add_error_data(2, "zlib error:",
+							zError(ret));
+				return 0;
+				}
+			/* If EOF or we've read everything then return */
+			if((ret == Z_STREAM_END) || !zin->avail_out)
+				return outl - zin->avail_out;
+			}
+
+		/* No data in input buffer try to read some in,
+		 * if an error then return the total data read.
+		 */
+		ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
+		if(ret <= 0)
+			{
+			/* Total data read */
+			int tot = outl - zin->avail_out;
+			BIO_copy_next_retry(b);
+			if(ret < 0) return (tot > 0) ? tot : ret;
+			return tot;
+			}
+		zin->avail_in = ret;
+		zin->next_in = ctx->ibuf;
+		}
+	}
+
+static int bio_zlib_write(BIO *b, const char *in, int inl)
+	{
+	BIO_ZLIB_CTX *ctx;
+	int ret;
+	z_stream *zout;
+	if(!in || !inl) return 0;
+	ctx = (BIO_ZLIB_CTX *)b->ptr;
+	if(ctx->odone) return 0;
+	zout = &ctx->zout;
+	BIO_clear_retry_flags(b);
+	if(!ctx->obuf)
+		{
+		ctx->obuf = OPENSSL_malloc(ctx->obufsize);
+		/* Need error here */
+		if(!ctx->obuf)
+			{
+			COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
+			return 0;
+			}
+		ctx->optr = ctx->obuf;
+		ctx->ocount = 0;
+		deflateInit(zout, ctx->comp_level);
+		zout->next_out = ctx->obuf;
+		zout->avail_out = ctx->obufsize;
+		}
+	/* Obtain input data directly from supplied buffer */
+	zout->next_in = (void *)in;
+	zout->avail_in = inl;
+	for(;;)
+		{
+		/* If data in output buffer write it first */
+		while(ctx->ocount) {
+			ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
+			if(ret <= 0)
+				{
+				/* Total data written */
+				int tot = inl - zout->avail_in;
+				BIO_copy_next_retry(b);
+				if(ret < 0) return (tot > 0) ? tot : ret;
+				return tot;
+				}
+			ctx->optr += ret;
+			ctx->ocount -= ret;
+		}
+
+		/* Have we consumed all supplied data? */
+		if(!zout->avail_in)
+			return inl;
+
+		/* Compress some more */
+
+		/* Reset buffer */
+		ctx->optr = ctx->obuf;
+		zout->next_out = ctx->obuf;
+		zout->avail_out = ctx->obufsize;
+		/* Compress some more */
+		ret = deflate(zout, 0);
+		if(ret != Z_OK)
+			{
+			COMPerr(COMP_F_BIO_ZLIB_WRITE,
+						COMP_R_ZLIB_DEFLATE_ERROR);
+			ERR_add_error_data(2, "zlib error:", zError(ret));
+			return 0;
+			}
+		ctx->ocount = ctx->obufsize - zout->avail_out;
+		}
+	}
+
+static int bio_zlib_flush(BIO *b)
+	{
+	BIO_ZLIB_CTX *ctx;
+	int ret;
+	z_stream *zout;
+	ctx = (BIO_ZLIB_CTX *)b->ptr;
+	/* If no data written or already flush show success */
+	if(!ctx->obuf || (ctx->odone && !ctx->ocount)) return 1;
+	zout = &ctx->zout;
+	BIO_clear_retry_flags(b);
+	/* No more input data */
+	zout->next_in = NULL;
+	zout->avail_in = 0;
+	for(;;)
+		{
+		/* If data in output buffer write it first */
+		while(ctx->ocount)
+			{
+			ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
+			if(ret <= 0)
+				{
+				BIO_copy_next_retry(b);
+				return ret;
+				}
+			ctx->optr += ret;
+			ctx->ocount -= ret;
+			}
+		if(ctx->odone) return 1;
+
+		/* Compress some more */
+
+		/* Reset buffer */
+		ctx->optr = ctx->obuf;
+		zout->next_out = ctx->obuf;
+		zout->avail_out = ctx->obufsize;
+		/* Compress some more */
+		ret = deflate(zout, Z_FINISH);
+		if(ret == Z_STREAM_END) ctx->odone = 1;
+		else if(ret != Z_OK)
+			{
+			COMPerr(COMP_F_BIO_ZLIB_FLUSH,
+						COMP_R_ZLIB_DEFLATE_ERROR);
+			ERR_add_error_data(2, "zlib error:", zError(ret));
+			return 0;
+			}
+		ctx->ocount = ctx->obufsize - zout->avail_out;
+		}
+	}
+
+static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
+	{
+	BIO_ZLIB_CTX *ctx;
+	int ret, *ip;
+	int ibs, obs;
+	if(!b->next_bio) return 0;
+	ctx = (BIO_ZLIB_CTX *)b->ptr;
+	switch (cmd)
+		{
+
+	case BIO_CTRL_RESET:
+		ctx->ocount = 0;
+		ctx->odone = 0;
+		ret = 1;
+		break;
+
+	case BIO_CTRL_FLUSH:
+		ret = bio_zlib_flush(b);
+		if (ret > 0)
+			ret = BIO_flush(b->next_bio);
+		break;
+
+	case BIO_C_SET_BUFF_SIZE:
+		ibs = -1;
+		obs = -1;
+		if (ptr != NULL)
+			{
+			ip = ptr;
+			if (*ip == 0)
+				ibs = (int) num;
+			else 
+				obs = (int) num;
+			}
+		else
+			{
+			ibs = (int)num;
+			obs = ibs;
+			}
+
+		if (ibs != -1)
+			{
+			if (ctx->ibuf)
+				{
+				OPENSSL_free(ctx->ibuf);
+				ctx->ibuf = NULL;
+				}
+			ctx->ibufsize = ibs;
+			}
+
+		if (obs != -1)
+			{
+			if (ctx->obuf)
+				{
+				OPENSSL_free(ctx->obuf);
+				ctx->obuf = NULL;
+				}
+			ctx->obufsize = obs;
+			}
+		ret = 1;
+		break;
+
+	case BIO_C_DO_STATE_MACHINE:
+		BIO_clear_retry_flags(b);
+		ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+		BIO_copy_next_retry(b);
+		break;
+
+	default:
+		ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+		break;
+
+		}
+
+	return ret;
+	}
+
+
+static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
+	{
+	if(!b->next_bio)
+		return 0;
+	return
+		BIO_callback_ctrl(b->next_bio, cmd, fp);
+	}
+
+#endif