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simplify code
This commit is contained in:
zhupengfei 2020-02-07 23:53:00 +08:00
parent 2ec99b83aa
commit db18f6c79a
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GPG key ID: DD129E108BD09378
1 changed files with 2 additions and 10 deletions
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12
src/core/file_sys/layered_fs.cpp
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@ -306,18 +306,10 @@ void LayeredFS::PrepareBuild(Directory& current) {
// Implementation from 3dbrew
u32 CalcHash(const std::string& name, u32 parent_offset) {
u32 hash = parent_offset ^ 123456789;
std::u16string u16name = Common::UTF8ToUTF16(name);
std::vector<u16_le> tmp_buffer(u16name.size());
std::transform(u16name.begin(), u16name.end(), tmp_buffer.begin(), [](char16_t character) {
return static_cast<u16_le>(static_cast<u16>(character));
});
std::vector<u8> buffer(tmp_buffer.size() * 2);
std::memcpy(buffer.data(), tmp_buffer.data(), buffer.size());
for (std::size_t i = 0; i < buffer.size(); i += 2) {
for (char16_t c : u16name) {
hash = (hash >> 5) | (hash << 27);
hash ^= static_cast<u16>((buffer[i]) | (buffer[i + 1] << 8));
hash ^= static_cast<u16>(c);
}
return hash;
}