From b64270d1e45fe7f3241e4c9b6ce60d5ac89bc2e9 Mon Sep 17 00:00:00 2001
From: beck <>
Date: Wed, 15 May 2002 02:29:21 +0000
Subject: OpenSSL 0.9.7 stable 2002 05 08 merge

---
 src/lib/libcrypto/comp/c_zlib.c | 141 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 134 insertions(+), 7 deletions(-)

(limited to 'src/lib/libcrypto/comp/c_zlib.c')

diff --git a/src/lib/libcrypto/comp/c_zlib.c b/src/lib/libcrypto/comp/c_zlib.c
index 6684ab4841..cd2f8a491b 100644
--- a/src/lib/libcrypto/comp/c_zlib.c
+++ b/src/lib/libcrypto/comp/c_zlib.c
@@ -6,11 +6,10 @@
 
 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,
@@ -18,6 +17,8 @@ static COMP_METHOD zlib_method={
 	NULL,
 	};
 
+#ifndef ZLIB
+#undef ZLIB_SHARED
 #else
 
 #include <zlib.h>
@@ -38,8 +39,56 @@ static COMP_METHOD zlib_method={
 	zlib_compress_block,
 	zlib_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.
+ */
+#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
+# include <windows.h>
+
+# define Z_CALLCONV _stdcall
+# define ZLIB_SHARED
+#else
+# define Z_CALLCONV
+#endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
+
+#ifdef ZLIB_SHARED
+#include <openssl/dso.h>
+
+/* Prototypes for built in stubs */
+static int stub_compress(Bytef *dest,uLongf *destLen,
+	const Bytef *source, uLong sourceLen);
+static int stub_inflateEnd(z_streamp strm);
+static int stub_inflate(z_streamp strm, int flush);
+static int stub_inflateInit_(z_streamp strm, const char * version,
+	int stream_size);
+
+/* Function pointers */
+typedef int (Z_CALLCONV *compress_ft)(Bytef *dest,uLongf *destLen,
+	const Bytef *source, uLong sourceLen);
+typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
+typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
+typedef int (Z_CALLCONV *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 inflateInit__ft	p_inflateInit_=NULL;
+
+static int zlib_loaded = 0;     /* only attempt to init func pts once */
+static DSO *zlib_dso = NULL;
+
+#define compress                stub_compress
+#define inflateEnd              stub_inflateEnd
+#define inflate                 stub_inflate
+#define inflateInit_            stub_inflateInit_
+#endif /* ZLIB_SHARED */
+
 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 	     unsigned int olen, unsigned char *in, unsigned int ilen)
 	{
@@ -66,7 +115,10 @@ static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 		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);
 	}
 
@@ -88,7 +140,10 @@ static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 		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);
 	}
 
@@ -128,6 +183,78 @@ static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
 
 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, "ZLIB", 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_");
+			zlib_loaded++;
+			meth = &zlib_method;
+			}
+		}
+
+#elif defined(ZLIB)
+	meth = &zlib_method;
+#endif
+
+	return(meth);
+	}
+
+#ifdef ZLIB_SHARED
+/* 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 /* ZLIB_SHARED */
-- 
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