POSIX implementation of ReadFile()

1 files changed, 20 insertions, 3 deletions

diff --git a/zencore/filesystem.cpp b/zencore/filesystem.cpp
index 6c5c32565..a042fb7a1 100644
--- a/zencore/filesystem.cpp
+++ b/zencore/filesystem.cpp
@@ -525,6 +525,10 @@ WriteFile(std::filesystem::path Path, IoBuffer Data)
 FileContents
 ReadFile(std::filesystem::path Path)
 {
+	uint64_t FileSizeBytes;
+	void* Handle;
+
+#if ZEN_PLATFORM_WINDOWS
 	ATL::CHandle FromFile(CreateFileW(Path.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, nullptr));
 	if (FromFile == INVALID_HANDLE_VALUE)
 	{
@@ -538,12 +542,25 @@ ReadFile(std::filesystem::path Path)
 		return FileContents{.ErrorCode = std::error_code(::GetLastError(), std::system_category())};
 	}
 
-	const uint64_t FileSizeBytes = FileSize.EndOfFile.QuadPart;
+	FileSizeBytes = FileSize.EndOfFile.QuadPart;
+	Handle = FromFile.Detach();
+#else
+	int Fd = open(Path.c_str(), O_RDONLY);
+	if (Fd < 0)
+	{
+		return FileContents{.ErrorCode = std::error_code(zen::GetLastError(), std::system_category())};
+	}
 
-	FileContents Contents;
+	static_assert(sizeof(decltype(stat::st_size)) == sizeof(uint64_t), "fstat() doesn't support large files");
+	struct stat Stat;
+	fstat(Fd, &Stat);
 
-	Contents.Data.emplace_back(IoBuffer(IoBuffer::File, FromFile.Detach(), 0, FileSizeBytes));
+	FileSizeBytes = Stat.st_size;
+	Handle = (void*)uintptr_t(Fd);
+#endif
 
+	FileContents Contents;
+	Contents.Data.emplace_back(IoBuffer(IoBuffer::File, Handle, 0, FileSizeBytes));
 	return Contents;
 }