Fix SkFILEStream.
Change-Id: I8c66e4e3e857227aed3d0bc497982f4c0d96d917
Reviewed-on: https://skia-review.googlesource.com/9498
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
diff --git a/src/ports/SkOSFile_win.cpp b/src/ports/SkOSFile_win.cpp
index cf46cea..ceafc79 100644
--- a/src/ports/SkOSFile_win.cpp
+++ b/src/ports/SkOSFile_win.cpp
@@ -124,6 +124,33 @@
return sk_fdmmap(fileno, length);
}
+size_t sk_qread(FILE* file, void* buffer, size_t count, size_t offset) {
+ int fileno = sk_fileno(file);
+ HANDLE fileHandle = (HANDLE)_get_osfhandle(fileno);
+ if (INVALID_HANDLE_VALUE == file) {
+ return SIZE_MAX;
+ }
+
+ OVERLAPPED overlapped = {0};
+ ULARGE_INTEGER winOffset;
+ winOffset.QuadPart = offset;
+ overlapped.Offset = winOffset.LowPart;
+ overlapped.OffsetHigh = winOffset.HighPart;
+
+ if (!SkTFitsIn<DWORD>(count)) {
+ count = std::numeric_limits<DWORD>::max();
+ }
+
+ DWORD bytesRead;
+ if (ReadFile(fileHandle, buffer, static_cast<DWORD>(count), &bytesRead, &overlapped)) {
+ return bytesRead;
+ }
+ if (GetLastError() == ERROR_HANDLE_EOF) {
+ return 0;
+ }
+ return SIZE_MAX;
+}
+
////////////////////////////////////////////////////////////////////////////
struct SkOSFileIterData {