ZipArchive memory problems on iPhone for large archive

I am trying to compress multiple files into a single zip archive and I am running into low memory warning. Since the complete zip file is loaded into the memory I guess that's开发者_JAVA技巧 the problem. Is there a way by which I can manage the compression/decompression better using ZipArchive so that not all the data is in the memory at once?

Thanks!

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After doing some investigation on alternatives to ZipArchive I found another project called Objective-zip that seems to be a little better than ZipArchive. Here is the link:

http://code.google.com/p/objective-zip/

The API is quite simple. One thing I ran into was that in the begging I was reading data and never releasing it so if you are adding a bunch of large files to the zip file remember to release the data. Here is a little code I used:

ZipFile *zipFile = [[ZipFile alloc] initWithFileName:archivePath mode:ZipFileModeCreate];

for(NSString *path in subpaths){
  NSData *data= [[NSData alloc] initWithContentsOfFile:longPath];
  ZipWriteStream *stream = [zipFile writeFileInZipWithName:path compressionLevel:ZipCompressionLevelNone];
  [stream writeData:data];
  [stream finishedWriting];
  [data release];
}

[zipFile close];
[zipFile release];

I hope this is helpful for anyone who runs into the same issue.

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An easier way to deal with this is to simply change ZipArchive's method of reading the file into the NSData. Just change the following code

data = [ NSData dataWithContentsOfFile:file ];

to

data = [ NSData dataWithContentsOfMappedFile:file ];

That will cause the OS to read the file in a memory mapped way. Basically it just uses way less memory as it reads from the file as it needs to rather than loading it all into memory at once.