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#include <zlib.h>
#include "gzops.h"
/*===========================================================================*/
bool testgzipfile(char *pcapinname)
{
int pcapr_fd;
uint32_t magicnumber;
pcapr_fd = open(pcapinname, O_RDONLY);
if(pcapr_fd == -1) return false;
magicnumber = getmagicnumber(pcapr_fd);
close(pcapr_fd);
#ifdef BIG_ENDIAN_HOST
magicnumber = byte_swap_32(magicnumber);
#endif
if((magicnumber & 0xffff) != GZIPMAGICNUMBER) return false;
if(((magicnumber >> 16) & 0xff) != DEFLATE) return false;
return true;
}
/*===========================================================================*/
bool decompressgz(char *gzname, char *tmpoutname)
{
FILE *fhin = NULL;
FILE *fhout = NULL;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
memset(&strm, 0, sizeof (strm));
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.next_in = in;
strm.avail_in = 0;
inflateInit2(& strm, windowBits | ENABLE_ZLIB_GZIP);
printf("decompressing %s to %s\n", basename(gzname), tmpoutname);
fhin = fopen (gzname, "r");
if(fhin == NULL)
{
printf("failed to decompress%s\n", gzname);
return false;
}
fhout = fopen (tmpoutname, "w");
if(fhout == NULL)
{
printf("failed to decompress%s\n", tmpoutname);
fclose(fhin);
return false;
}
while(1)
{
int bytes_read;
int zlib_status;
bytes_read = fread(in, sizeof(char), sizeof(in), fhin);
if(ferror(fhin))
{
inflateEnd(&strm);
printf("failed to decompress %s\n", gzname);
fclose(fhout);
fclose(fhin);
return false;
}
strm.avail_in = bytes_read;
strm.next_in = in;
do
{
unsigned have;
strm.avail_out = CHUNK;
strm.next_out = out;
zlib_status = inflate(&strm, Z_NO_FLUSH);
switch (zlib_status)
{
case Z_OK:
case Z_STREAM_END:
case Z_BUF_ERROR:
break;
default:
inflateEnd (&strm);
printf("failed to decompress %s\n", gzname);
return false;
}
have = CHUNK -strm.avail_out;
fwrite(out, sizeof (unsigned char), have, fhout);
}
while(strm.avail_out == 0);
if(feof(fhin))
{
inflateEnd(&strm);
break;
}
}
fclose(fhout);
fclose(fhin);
return true;
}
/*===========================================================================*/
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