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Merge pull request #61 from lioncash/size 

FileWriterWin32: Handle large files within writeUBytes
This commit is contained in:
Phillip Stephens 2019-09-07 07:06:33 -07:00 committed by GitHub
parent 1e2f5d4ec0 3b1348a26a
commit 30158859f7
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 10 deletions
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35
src/athena/FileWriterWin32.cpp
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@ -1,5 +1,10 @@
#include "athena/FileWriter.hpp"
#include "win32_largefilewrapper.h"
#include <algorithm>
#include <limits>
#undef min
#undef max
namespace athena::io {
FileWriter::FileWriter(std::string_view filename, bool overwrite, bool globalErr)
@ -89,26 +94,36 @@ atUint64 FileWriter::position() const {
LARGE_INTEGER li = {};
LARGE_INTEGER res;
SetFilePointerEx(m_fileHandle, li, &res, FILE_CURRENT);
return res.QuadPart;
return static_cast<atUint64>(res.QuadPart);
}
atUint64 FileWriter::length() const { return utility::fileSize(m_filename); }
void FileWriter::writeUBytes(const atUint8* data, atUint64 len) {
if (!isOpen()) {
if (m_globalErr)
if (m_globalErr) {
atError(fmt("File not open for writing"));
}
setError();
return;
}
DWORD ret = 0;
WriteFile(m_fileHandle, data, len, &ret, nullptr);
if (ret != len) {
if (m_globalErr)
atError(fmt("Unable to write to stream"));
setError();
}
atUint64 remaining = len;
do {
const auto toWrite = static_cast<DWORD>(std::min(remaining, atUint64{std::numeric_limits<DWORD>::max()}));
DWORD written = 0;
if (WriteFile(m_fileHandle, data, toWrite, &written, nullptr) == FALSE) {
if (m_globalErr) {
atError(fmt("Unable to write to file"));
}
setError();
return;
}
remaining -= written;
data += written;
} while (remaining != 0);
}
} // namespace athena::io