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#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_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,
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>
#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);
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 p_compress
#define inflateEnd p_inflateEnd
#define inflate p_inflate
#define inflateInit_ p_inflateInit_
#endif /* ZLIB_SHARED */
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_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_");
if (p_compress && p_inflateEnd && p_inflate
&& p_inflateInit_)
zlib_loaded++;
}
}
#endif
#ifdef ZLIB_SHARED
if (zlib_loaded)
#endif
#if defined(ZLIB) || defined(ZLIB_SHARED)
meth = &zlib_method;
#endif
return(meth);
}
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