134 lines
2.5 KiB
C
134 lines
2.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/objects.h>
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#include <openssl/comp.h>
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COMP_METHOD *COMP_zlib(void );
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#ifndef ZLIB
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static COMP_METHOD zlib_method={
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NID_undef,
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"(null)",
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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};
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#else
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#include <zlib.h>
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static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen);
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static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen);
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static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
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uLong sourceLen);
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static COMP_METHOD zlib_method={
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NID_zlib_compression,
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LN_zlib_compression,
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NULL,
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NULL,
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zlib_compress_block,
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zlib_expand_block,
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NULL,
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};
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static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen)
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{
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unsigned long l;
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int i;
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int clear=1;
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if (ilen > 128)
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{
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out[0]=1;
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l=olen-1;
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i=compress(&(out[1]),&l,in,(unsigned long)ilen);
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if (i != Z_OK)
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return(-1);
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if (ilen > l)
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{
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clear=0;
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l++;
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}
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}
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if (clear)
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{
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out[0]=0;
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memcpy(&(out[1]),in,ilen);
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l=ilen+1;
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}
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fprintf(stderr,"compress(%4d)->%4d %s\n",ilen,(int)l,(clear)?"clear":"zlib");
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return((int)l);
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}
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static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen)
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{
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unsigned long l;
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int i;
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if (in[0])
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{
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l=olen;
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i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
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if (i != Z_OK)
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return(-1);
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}
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else
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{
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memcpy(out,&(in[1]),ilen-1);
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l=ilen-1;
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}
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fprintf(stderr,"expand (%4d)->%4d %s\n",ilen,(int)l,in[0]?"zlib":"clear");
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return((int)l);
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}
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static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
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uLong sourceLen)
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{
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z_stream stream;
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int err;
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stream.next_in = (Bytef*)source;
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stream.avail_in = (uInt)sourceLen;
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/* Check for source > 64K on 16-bit machine: */
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if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
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stream.next_out = dest;
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stream.avail_out = (uInt)*destLen;
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if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
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stream.zalloc = (alloc_func)0;
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stream.zfree = (free_func)0;
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err = inflateInit(&stream);
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if (err != Z_OK) return err;
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err = inflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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inflateEnd(&stream);
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return err;
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}
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*destLen = stream.total_out;
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err = inflateEnd(&stream);
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return err;
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}
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#endif
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COMP_METHOD *COMP_zlib(void)
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{
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return(&zlib_method);
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}
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