3/17/2023 0 Comments Wpinternals for mac![]() If it exists, it should be immediately before the "End of central directory record". "the only way to look up the locator is by looking up the magic number for locator" is not true. Larger amounts of data here would not only take longer to scan for the signature, but the random chance of accidentally finding the minimal 4 byte / 32-bit "zip64 end of central directory" signature will increase with the length of the data. ![]() ![]() While this may seem extreme, doing so could certainly lead to needing to span disks between the locator and the "Zip64 end of central directory record". Multiple of these fields may exist, and each starts with a header ID of 2 bytes, followed by a data size of 4 bytes - followed by the actual "special purpose data" - allowing for multiple 2^32 bytes (4 GB) of data. Additionally, there is no guarantee that the magic number won't be found elsewhere within the data, which could cause the implementation to read from incorrect data if it starts reading from an invalid but "assumed correct" location.Īfter doing some additional implementation around this myself, I think the most significant thing to note is that "special purpose data may reside in the zip64 extensible data sector field" (following the Zip64 end of central directory record). Navigating directly to a byte offset in a file is significantly faster than searching for a magic number.
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