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    <p>I had this issue and sorted it out. The code is slightly buggy as it breaks if Z_BUF_ERROR is returned, yet on reading the <a href="http://zlib.net/zlib_how.html" rel="nofollow noreferrer">zlib Documentation</a> it turns out that Z_BUF_ERROR should not be checked on inflation, as it can be thrown even if the resulting output is fine.</p> <p>Changing the code thus worked:</p> <pre><code>// Inflate another chunk. status = inflate (&amp;strm, Z_SYNC_FLUSH); if ( (status == Z_STREAM_END) || (status == Z_BUF_ERROR) ) done = YES; </code></pre> <p>Hope this works for you.</p> <p>EDIT: (18th June 2011)<br> Here is the full inflation method, as requested. It is implemented as a category on NSData:</p> <pre><code>@interface NSData (NSDataExtension) - (NSData *) zlibInflate; @end @implementation NSData (NSDataExtension) - (NSData *)zlibInflate { if ([self length] == 0) return self; unsigned full_length = [self length]; unsigned half_length = [self length] / 2; NSMutableData *decompressed = [NSMutableData dataWithLength: full_length + half_length]; BOOL done = NO; int status; z_stream strm; strm.next_in = (Bytef *)[self bytes]; strm.avail_in = [self length]; strm.total_out = 0; strm.zalloc = Z_NULL; strm.zfree = Z_NULL; if (inflateInit (&amp;strm) != Z_OK) return nil; while (!done) { // Make sure we have enough room and reset the lengths. if (strm.total_out &gt;= [decompressed length]) [decompressed increaseLengthBy: half_length]; strm.next_out = [decompressed mutableBytes] + strm.total_out; strm.avail_out = [decompressed length] - strm.total_out; // Inflate another chunk. status = inflate (&amp;strm, Z_SYNC_FLUSH); if ( (status == Z_STREAM_END) || (status == Z_BUF_ERROR) ) done = YES; else if (status != Z_OK) break; } if (inflateEnd (&amp;strm) != Z_OK) return nil; // Set real length. if (done) { [decompressed setLength: strm.total_out]; return [NSData dataWithData: decompressed]; } else return nil; } @end </code></pre> <p>Carlos</p>
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    1. POzLib on iPhone, stop at first BLOCK
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    1. COHi, Carlos, It's very encouraging to see someone finally got it work. However, I made the change you suggested, it doesn't work either. I am afraid my code has other problems. So, can you attach the whole inflation code here? Thanks! Cedric
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    2. COHi Cedric, sure i'll try to remember to dig it out
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    3. COAs promised, I dug out the code; I'll try to post it as another answer. If it helps you, maybe you could mark as correct.
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