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Win32 FS: Implement support for large reads/writes

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Eladash 2021-07-15 20:39:50 +03:00 • committed by kd-11
parent aaac4c1bde
commit 66368debf8
1 changed files with 36 additions and 10 deletions
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46
Utilities/File.cpp
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@ -1154,24 +1154,50 @@ fs::file::file(const std::string& path, bs_t<open_mode> mode)
u64 read(void* buffer, u64 count) override u64 read(void* buffer, u64 count) override
{ {
// TODO (call ReadFile multiple times if count is too big) u64 nread_sum = 0;
const int size = narrow<int>(count);
DWORD nread; for (char* data = static_cast<char*>(buffer); count;)
ensure(ReadFile(m_handle, buffer, size, &nread, nullptr)); // "file::read" {
const DWORD size = static_cast<DWORD>(std::min<u64>(count, DWORD{umax} & -4096));
return nread; DWORD nread = 0;
ensure(ReadFile(m_handle, data, size, &nread, nullptr)); // "file::read"
nread_sum += nread;
if (nread < size)
{
break;
}
count -= size;
data += size;
}
return nread_sum;
} }
u64 write(const void* buffer, u64 count) override u64 write(const void* buffer, u64 count) override
{ {
// TODO (call WriteFile multiple times if count is too big) u64 nwritten_sum = 0;
const int size = narrow<int>(count);
DWORD nwritten; for (const char* data = static_cast<const char*>(buffer); count;)
ensure(WriteFile(m_handle, buffer, size, &nwritten, nullptr)); // "file::write" {
const DWORD size = static_cast<DWORD>(std::min<u64>(count, DWORD{umax} & -4096));
return nwritten; DWORD nwritten = 0;
ensure(WriteFile(m_handle, data, size, &nwritten, nullptr)); // "file::write"
nwritten_sum += nwritten;
if (nwritten < size)
{
break;
}
count -= size;
data += size;
}
return nwritten_sum;
} }
u64 seek(s64 offset, seek_mode whence) override u64 seek(s64 offset, seek_mode whence) override