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#1
08-28-2006
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uncompress of zlib
When I gzopen & gzread from a gzip file, it works OK. But I when I try to uncompress the same data from memory (either by reading to memory with fread or mmap()ing) using decompress, I get Z_DATA_ERROR. Is it because gzip file has some kind of headers that uncompress doesn't want?
How can I get around this? Code:
fp = fopen("file.gz", "r");
buf = mmap(0,len,PROT_READ,MAP_SHARED,fileno(fp),0);
assert(buf);
if(uncompress(out,&outsize,buf,len) == Z_DATA_ERROR) fprintf(stderr,"boh\n");
Code:
uncompress(out,&outsize,buf+8,len-8) Last edited by rayne; 08-28-2006 at 03:27 PM. 
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#2
08-29-2006
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OK, I figured it out.
zlib function uncompress uses inflateInit(), which accepts zlib format, not gzip. I've changed inflateInit() to inflateInit2() and it worked. However, for 2nd argument of inflateInit2(), I've tried various numbers but it worked for only 24,30,47. Which means at least 16MB of buffer! How can I get around this now?
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