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Compressed Resource Manager
Submitted by |
This is a small utility for managing compressed resources on windows and linux.
By replacing the fopen(), fread() etc. functions it allows an application
already using these functions to access the compressed data transparently. When
attempting any file operations, preference is given to uncompressed 'normal'
files on disk, and then to the contents of compressed bundles. If a normal file
is found the standard file functions are used, otherwise an entry from a bundle
may be uncompressed and used from memory. Any number of compressed bundles can
be used - at application startup a list of bundles and their contents is built
automatically. One bundle kind of corresponds to one directory, and as such the
location of the bundle in relation to the application's working directory is
taken into account when deciding what the path of the files it contains will be.
Replaced functions are: fopen, fclose, fread, fwrite, fseek, rewind, fgetpos,
fsetpos, feof. The Windows FindFirstFile() method of iterating through a set of
files matching a search pattern is also implemented transparently (on Windows).
Using zlib, the file format for these bundles is one which I just made up, and
doesn't support writing into these bundles (fwrite works as normal for normal
files though), so it is mainly useful for a final distribution, patches or maybe
obfuscating game assets. There is a utility for compressing and testing bundles,
you can find a bit more info about usage and limitations at www.zppz.com. This
code is free for whoever finds it useful to do what they please with.
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The zip file viewer built into the Developer Toolbox made use
of the zlib library, as well as the zlibdll source additions.
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