mirror of
https://github.com/AquariaOSE/Aquaria.git
synced 2024-11-16 06:29:31 +00:00
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
|
#ifndef VFS_ARCHIVE_LOADER_H
|
||
|
|
#define VFS_ARCHIVE_LOADER_H
|
||
|
|
|
||
|
|
#include "VFSDefines.h"
|
||
|
|
|
||
|
|
VFS_NAMESPACE_START
|
||
|
|
|
||
|
|
class VFSDir;
|
||
|
|
class VFSFile;
|
||
|
|
class VFSLoader;
|
||
|
|
|
||
|
|
// Generic Archive loader interface that is supposed to return a valid VFSDir pointer when it
|
||
|
|
// was able to load 'arch' as an archive, and NULL if there was an error or the loader is
|
||
|
|
// unable to load that file type.
|
||
|
|
// 'asSubdir' - if this is true, the archive will be accessible as a folder (as in "test.zip/file.dat"),
|
||
|
|
// otherwise the files are mounted in place of the archive.
|
||
|
|
// 'ldr' - can be set to an external file loader in case the file/folder tree can not be fully generated
|
||
|
|
// at load time.
|
||
|
|
// 'opaque' - a POD struct which *must* have a `void (*)(void*, void*, const char*)`
|
||
|
|
// function pointer as first member (at offset 0).
|
||
|
|
// The struct pointer is then passed to that function, along with a pointer to an internal object,
|
||
|
|
// whatever this is. The derived loader knows what this object is - something that this callback
|
||
|
|
// will be interested in modifying, anyways. The rest of the struct can carry the data required to
|
||
|
|
// modify this object.
|
||
|
|
// The const char parameter is a string unique for each loader (to prevent accessing the pointer
|
||
|
|
// in a wrong way by the wrong loader). Example below.
|
||
|
|
class VFSArchiveLoader
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
virtual ~VFSArchiveLoader() {}
|
||
|
|
|
||
|
|
virtual VFSDir *Load(VFSFile *arch, VFSLoader **ldr, void *opaque = NULL) = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* A possible struct for 'opaque' would be:
|
||
|
|
|
||
|
|
struct ExampleLoadParams
|
||
|
|
{
|
||
|
|
void (*callback)(void *, void *, const char *);
|
||
|
|
const char *key;
|
||
|
|
unsigned int keylen;
|
||
|
|
};
|
||
|
|
|
||
|
|
And then the call would look like:
|
||
|
|
(Assuming PakFile is an archive file class that represents an archive)
|
||
|
|
|
||
|
|
void pakSetup(void *data, void *arch, const char *id)
|
||
|
|
{
|
||
|
|
if(strcmp(id, "pak")) // Be sure we're in the right loader.
|
||
|
|
return;
|
||
|
|
ExampleLoadParams *pm = (ExampleLoadParams*)p;
|
||
|
|
PakArchive *pak = (PakArchive*)arch;
|
||
|
|
pak->SetKey(pm->key, pm->keylen);
|
||
|
|
}
|
||
|
|
|
||
|
|
ExampleLoadParams p;
|
||
|
|
p.callback = &pakSetup;
|
||
|
|
p.key = "123456";
|
||
|
|
p.keylen = 6;
|
||
|
|
vfs.AddArchive("data.pak", false, "", &p);
|
||
|
|
|
||
|
|
Where p in turn will be passed to the PAK loader.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
VFS_NAMESPACE_END
|
||
|
|
|
||
|
|
#endif
|