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69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
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#ifndef VFS_ARCHIVE_LOADER_H
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#define VFS_ARCHIVE_LOADER_H
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#include "VFSDefines.h"
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VFS_NAMESPACE_START
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class VFSDir;
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class VFSFile;
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class VFSLoader;
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// Generic Archive loader interface that is supposed to return a valid VFSDir pointer when it
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// was able to load 'arch' as an archive, and NULL if there was an error or the loader is
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// unable to load that file type.
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// 'asSubdir' - if this is true, the archive will be accessible as a folder (as in "test.zip/file.dat"),
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// otherwise the files are mounted in place of the archive.
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// 'ldr' - can be set to an external file loader in case the file/folder tree can not be fully generated
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// at load time.
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// 'opaque' - a POD struct which *must* have a `void (*)(void*, void*, const char*)`
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// function pointer as first member (at offset 0).
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// The struct pointer is then passed to that function, along with a pointer to an internal object,
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// whatever this is. The derived loader knows what this object is - something that this callback
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// will be interested in modifying, anyways. The rest of the struct can carry the data required to
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// modify this object.
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// The const char parameter is a string unique for each loader (to prevent accessing the pointer
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// in a wrong way by the wrong loader). Example below.
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class VFSArchiveLoader
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{
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public:
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virtual ~VFSArchiveLoader() {}
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virtual VFSDir *Load(VFSFile *arch, VFSLoader **ldr, void *opaque = NULL) = 0;
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};
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/* A possible struct for 'opaque' would be:
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struct ExampleLoadParams
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{
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void (*callback)(void *, void *, const char *);
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const char *key;
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unsigned int keylen;
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};
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And then the call would look like:
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(Assuming PakFile is an archive file class that represents an archive)
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void pakSetup(void *data, void *arch, const char *id)
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{
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if(strcmp(id, "pak")) // Be sure we're in the right loader.
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return;
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ExampleLoadParams *pm = (ExampleLoadParams*)p;
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PakArchive *pak = (PakArchive*)arch;
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pak->SetKey(pm->key, pm->keylen);
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}
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ExampleLoadParams p;
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p.callback = &pakSetup;
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p.key = "123456";
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p.keylen = 6;
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vfs.AddArchive("data.pak", false, "", &p);
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Where p in turn will be passed to the PAK loader.
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*/
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VFS_NAMESPACE_END
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#endif
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