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Implement RomFS cache and async reads. (#7089)

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* Implement RomFS cache and async reads.

* Suggestions and fix compilation.

* Apply suggestions
This commit is contained in:
PabloMK7 2023-11-03 01:19:00 +01:00 • committed by GitHub
parent 79ea06b226
commit 4284893044
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 404 additions and 22 deletions
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37
src/common/file_util.cpp
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@ -1155,6 +1155,43 @@ std::size_t IOFile::ReadImpl(void* data, std::size_t length, std::size_t data_si
return std::fread(data, data_size, length, m_file);
}
#ifdef _WIN32
static std::size_t pread(int fd, void* buf, size_t count, uint64_t offset) {
long unsigned int read_bytes = 0;
OVERLAPPED overlapped = {0};
HANDLE file = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
overlapped.OffsetHigh = static_cast<uint32_t>(offset >> 32);
overlapped.Offset = static_cast<uint32_t>(offset & 0xFFFF'FFFFLL);
SetLastError(0);
bool ret = ReadFile(file, buf, static_cast<uint32_t>(count), &read_bytes, &overlapped);
if (!ret && GetLastError() != ERROR_HANDLE_EOF) {
errno = GetLastError();
return std::numeric_limits<std::size_t>::max();
}
return read_bytes;
}
#else
#define pread ::pread
#endif
std::size_t IOFile::ReadAtImpl(void* data, std::size_t length, std::size_t data_size,
std::size_t offset) {
if (!IsOpen()) {
m_good = false;
return std::numeric_limits<std::size_t>::max();
}
if (length == 0) {
return 0;
}
DEBUG_ASSERT(data != nullptr);
return pread(fileno(m_file), data, data_size * length, offset);
}
std::size_t IOFile::WriteImpl(const void* data, std::size_t length, std::size_t data_size) {
if (!IsOpen()) {
m_good = false;