Hi
Try using my code, it works fine with large textfiles.
int gzip(FileHand inf, FileHand outf)
{
z_stream gzipit;
int readgot, isav;
unsigned long crc32val, itotal, total = 0;
unsigned char ibuf[BSIZ], obuf[ZBSIZ];
/*to use the deflate function the gzipit structure has to be initialised*/
memset(&gzipit, 0, sizeof(gzipit));
FileTell(inf,(long *)&itotal, NULL);
crc32val = CRCVAL_INITIAL;
gzipit.next_out = ibuf;
gzipit.avail_out = BSIZ;
/*initialise all needed structures*/
ZLSetup;
if(deflateInit2(&gzipit, /* level */ 8, 8,/* bits */ 13, /* memlevel */ 6, 0) !=
Z_OK)return -1;
readgot = ZBSIZ;
/*read the file as long as ZBSIZ long pieces can be read*/
while (!FileEOF(inf) && readgot == ZBSIZ)
{
obuf[0]=chrNull;
if (0 >= (readgot = FileRead(inf, obuf,1 , ZBSIZ, NULL)))
break;
crc32val = crc32(crc32val, obuf, readgot);
total += readgot;
/*set the next-in next-out pointer, compress the data and write it into the outf file*/
gzipit.next_in = obuf;
gzipit.avail_in =readgot;
while (gzipit.avail_in || readgot !=ZBSIZ)
{
isav = deflate(&gzipit, readgot == ZBSIZ ? 0 : Z_FINISH);
if(isav<0)
{
deflateEnd(&gzipit);
return -1;
}
if( gzipit.avail_out == BSIZ ) /* no bytes added */
break;
FileWrite(outf, ibuf, 1, BSIZ - gzipit.avail_out, NULL);
gzipit.next_out = ibuf;
gzipit.avail_out = BSIZ;
}
}
/*the rest of the data that is smaller as ZBSIZ has to be compressed*/
isav = deflate(&gzipit, Z_FINISH);
FileWrite(outf, ibuf, 1, BSIZ - gzipit.avail_out, NULL);
if(isav<0)
{
deflateEnd(&gzipit);
return -1;
}
/*if any error occured the function exits immediately*/
isav = deflateEnd(&gzipit);
if(isav<0)
return -1;
memcpy(ibuf,&crc32val,4);
itotal = LG(ibuf);
FileWrite(outf, &itotal, 1, 4, NULL);
memcpy(ibuf,&total,4);
itotal = LG(ibuf);
FileWrite(outf, &itotal, 1, 4, NULL);
return 0;
}
Christian
"Palm Developer Forum" <[EMAIL PROTECTED]> schrieb am 28.07.04 08:14:15:
>
> I'm trying to compress a set of text files using this library...
>
> I've been running into problems with files that are 32k or larger. I keep getting a
> Z_MEM_ERROR.
>
> In the manual for the library it doesn't mention the fact that you can't compress
> anything larger then 32k. Does anyone know if this is a limitation? Or is it
> something to do with the text file.
>
> I've taken a 24k text file that i know that works and have copy and pasted some of
> the text to make it 32k. Still comes up with the same error.
>
> any insights would be appreciated.
> --
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