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Speed up RomFS browsing via lv3 hashes

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This commit is contained in:
d0k3 2016-12-02 16:42:39 +01:00
parent dc3ea378ce
commit 1b4481daa5
2 changed files with 32 additions and 5 deletions
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22
source/virtual/vgame.c
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@ -550,6 +550,28 @@ int ReadVGameFile(const VirtualFile* vfile, u8* buffer, u32 offset, u32 count) {
return 0;
}
bool FindVirtualFileInLv3Dir(VirtualFile* vfile, const VirtualDir* vdir, const char* name) {
vfile->name[0] = '\0';
vfile->flags = vdir->flags & ~VFLAG_DIR;
RomFsLv3FileMeta* lv3file = GetLv3FileMeta(name, vdir->offset, &lv3idx);
if (lv3file) {
vfile->offset = ((u8*) lv3file) - ((u8*) lv3idx.filemeta);
vfile->size = lv3file->size_data;
return true;
}
RomFsLv3DirMeta* lv3dir = GetLv3DirMeta(name, vdir->offset, &lv3idx);
if (lv3dir) {
vfile->offset = ((u8*) lv3dir) - ((u8*) lv3idx.dirmeta);
vfile->size = 0;
vfile->flags |= VFLAG_DIR;
return true;
}
return false;
}
bool GetVGameLv3Filename(char* name, const VirtualFile* vfile, u32 n_chars) {
if (!(vfile->flags & VFLAG_LV3))
return false;

5
source/virtual/virtual.c
View File

@ -88,12 +88,17 @@ bool GetVirtualFile(VirtualFile* vfile, const char* path) {
VirtualDir vdir;
if (!OpenVirtualRoot(&vdir, virtual_src)) return false;
for (name = strtok(lpath + 3, "/"); name && vdir.virtual_src; name = strtok(NULL, "/")) {
if (!(vdir.flags & VFLAG_LV3)) { // standard method
while (true) {
if (!ReadVirtualDir(vfile, &vdir)) return false;
if ((!(vfile->flags & VFLAG_LV3) && (strncasecmp(name, vfile->name, 32) == 0)) ||
((vfile->flags & VFLAG_LV3) && MatchVGameLv3Filename(name, vfile, 256)))
break; // entry found
}
} else { // use lv3 hashes for quicker search
if (!FindVirtualFileInLv3Dir(vfile, &vdir, name))
return false;
}
if (!OpenVirtualDir(&vdir, vfile))
vdir.virtual_src = 0;
}