Zip file corruption after writing less than 4 GB (with 64 bit I/O) on iOS

[ghost]

Hello,

it's again me and it's again an issue on iOS. The sequence to reproduce the problem is the following:

• create a new file with zipOpen;
• add a new file to the zip with zipOpenNewFileInZip3 in deflate mode;
• write uncompressible (e.g.: random) data with zipWriteInFileInZip until you have written 4,294,080,000 bytes (until 4,293,387,000 bytes it works, not sure in the middle);
• close the file with zipCloseFileInZip.

At this point you will get error -103 (ZIP_BADZIPFILE). The error is produced at line #1808 of zip.c, that is:

        if(uncompressed_size >= 0xffffffff || compressed_size >= 0xffffffff)
        {
            if(zi->ci.pos_zip64extrainfo > 0)
            {
                // Update the size in the ZIP64 extended field.
                // [...]
            }
            else
                err = ZIP_BADZIPFILE; // Caller passed zip64 = 0, so no room for zip64 info -> fatal
        }
        else
            // [...]

It seems that when compiling for iOS the library misconfigures the 64 bit I/O APIs in some way.
Best regards,

Gianluca

[nmoinvaz]

You should use zipOpenNewFileInZip3_64 to enable ZIP64 support. Be sure to set the last parameter to 1.