using zlib
Author
Hi.
Does anyone know how to use zlib to view and extract a particular file from an archive?
I have taken a look at the info on the site, and it says how to decompress some data in memory, but I can't see how to look view what files are in an archive.
The whole zlib isn't particularely clear, but look into the contrib folder.
If you're after PKZip (Winzip etc.) look into minizip.c/.h, it will behave like a command line zip tool and shows how to read and write a file from an archive.
There's also a file for GZip.
[edit: cleared up]
[Edited by - Endurion on November 24, 2004 3:56:49 AM]
If you're after PKZip (Winzip etc.) look into minizip.c/.h, it will behave like a command line zip tool and shows how to read and write a file from an archive.
There's also a file for GZip.
[edit: cleared up]
[Edited by - Endurion on November 24, 2004 3:56:49 AM]
Author
Okay, I've looked, but it seems that the function "file_uncompress" deletes the archive after uncompressing, so I thought to use "gz_uncompress", but what is the definition 'gzFile'.
Is it a typedef of something or an defined type such as a struct?
I've been looking, but as of yet, I haven't been able to find the definition of it.
Is it a typedef of something or an defined type such as a struct?
I've been looking, but as of yet, I haven't been able to find the definition of it.
from the manual:
(voidp is void*)
Quote:
int gzread (gzFile file, voidp buf, unsigned len);
Reads the given number of uncompressed bytes from the compressed file.
typedef voidp gzFile;
(voidp is void*)
I hope that this will be helpful. I dont know if it works.
BTW the functions that I use here are defined in "unzip.h"
to read from a zip file, simply use "unzReadCurrentFile"
BTW the functions that I use here are defined in "unzip.h"
unzFile openZipFile(const char* strZipPackage, const char* strFile){ unzFile fp = unzOpen(strZipPackage); if (fp == NULL) return NULL; if (unzLocateFile(fp,strFile,0) != UNZ_OK) { unzClose(fp); return NULL; } if (unzOpenCurrentFile(fp) != UNZ_OK) { unzClose(fp); return NULL; } return fp;}void closeZipFile(unzFile fp){ if (fp) { unzCloseCurrentFile(fp); unzClose(fp); }}void printZipPackageContent(const char* strZipPackage){ unzFile fp = unzOpen(strZipPackage); if (fp == 0) return; bool more_files = true; unzGoToFirstFile(fp); while (more_files) { char strFileName[256]; unz_file_info finfo; // holds some info about the file unzGetCurrentFileInfo(fp,&finfo,strFileName,256,NULL,0,NULL,0); more_files = (unzGoToNextFile(fp) == UNZ_OK); printf("%s\n",strFileName); }}to read from a zip file, simply use "unzReadCurrentFile"
zlib has been discussed in the forum many many times. Try the forum search located in the top right hand of the page. It's pretty useful!
gl hf
gl hf
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