99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
#include "vfs.h"
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#define MaxDevices 256
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#define ReturnInvalid() { File ret; ret.Type = FileTypeInvalid; return ret;}
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unsigned CurrentDevice = 0;
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unsigned DeviceCount = 0;
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FileSystemPointer _FileSystems[MaxDevices];
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File VFSOpenFile (const char* FileName)
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{
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unsigned Device = CurrentDevice;
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// No filename specified.
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if (!FileName) ReturnInvalid();
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// File length
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int len = strlen(FileName);
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// File name without drive
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char* Name = 0;
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// Check if relative or absolute path
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int i;
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for (i=0; i < len; i++)
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if (FileName[i] == ':') {
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Name = &FileName[i+1];
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FileName[i] = 0;
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len = i;
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}
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// If absolute path, find device
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if (Name != 0) {
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for (i=0; i < MaxDevices; i++)
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if (_FileSystems[i]) {
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if (strcmp(_FileSystems[i]->Name, FileName) == 0) Device = i;
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}
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}
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// Drive is nonexistant or current drive not mounted
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if (i==MaxDevices || !_FileSystems[Device]) ReturnInvalid();
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// Open file
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return _FileSystems[Device]->Open((Name) ? Name : FileName);
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}
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int VFSInstallFileSystem(FileSystemPointer fs)
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{
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// Sanity check
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if (!fs) return 0;
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// Verify device does not exist
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int i;
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for (i=0; i < DeviceCount; i++)
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if (_FileSystems[i])
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if (strcmp (fs->Name, _FileSystems[i]->Name) == 0) return 0;
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_FileSystems[DeviceCount] = fs; DeviceCount++;
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}
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void VFSUninstallFileSystem(FileSystemPointer fs)
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{
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if (!fs) return;
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int i;
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for (i=0; i<DeviceCount; i++)
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if (_FileSystems[i] == fs) {
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_FileSystems[i] = 0;
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return;
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}
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}
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void VFSUninstallFileSystemByName(const char* fs)
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{
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if (!fs) return;
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int i;
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for (i=0; i<DeviceCount; i++)
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if (_FileSystems[i])
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if (strcmp(_FileSystems[i]->Name, fs) == 0){
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_FileSystems[i] = 0;
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return;
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}
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}
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void VFSReadFile (FilePointer f, unsigned char* buffer, unsigned len)
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{
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if (!f || !_FileSystems[f->Device]) return;
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_FileSystems[f->Device]->Read (f, buffer, len);
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}
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void VFSCloseFile (FilePointer f)
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{
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if (!f || !_FileSystems[f->Device]) return;
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_FileSystems[f->Device]->Close(f);
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}
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