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file_util: Early-exit in WriteArray and ReadArray if specified lengths are zero
It's undefined behavior to pass a null pointer to std::fread and std::fwrite, even if the length passed in is zero, so we must perform the precondition checking ourselves. A common case where this can occur is when passing in the data of an empty std::vector and size, as an empty vector will typically have a null internal buffer. While we're at it, we can move the implementation out of line and add debug checks against passing in nullptr to std::fread and std::fwrite.
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@ -967,6 +967,34 @@ bool IOFile::Flush() {
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return IsOpen() && 0 == std::fflush(m_file);
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}
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std::size_t IOFile::ReadImpl(void* data, std::size_t length, std::size_t data_size) const {
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if (!IsOpen()) {
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return std::numeric_limits<std::size_t>::max();
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}
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if (length == 0) {
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return 0;
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}
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DEBUG_ASSERT(data != nullptr);
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return std::fread(data, data_size, length, m_file);
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}
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std::size_t IOFile::WriteImpl(const void* data, std::size_t length, std::size_t data_size) {
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if (!IsOpen()) {
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return std::numeric_limits<std::size_t>::max();
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}
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if (length == 0) {
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return 0;
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}
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DEBUG_ASSERT(data != nullptr);
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return std::fwrite(data, data_size, length, m_file);
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}
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bool IOFile::Resize(u64 size) {
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return IsOpen() && 0 ==
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#ifdef _WIN32
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@ -222,22 +222,15 @@ public:
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static_assert(std::is_trivially_copyable_v<T>,
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"Given array does not consist of trivially copyable objects");
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if (!IsOpen()) {
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return std::numeric_limits<std::size_t>::max();
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}
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return std::fread(data, sizeof(T), length, m_file);
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return ReadImpl(data, length, sizeof(T));
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}
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template <typename T>
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std::size_t WriteArray(const T* data, std::size_t length) {
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static_assert(std::is_trivially_copyable_v<T>,
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"Given array does not consist of trivially copyable objects");
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if (!IsOpen()) {
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return std::numeric_limits<std::size_t>::max();
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}
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return std::fwrite(data, sizeof(T), length, m_file);
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return WriteImpl(data, length, sizeof(T));
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}
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template <typename T>
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@ -278,6 +271,9 @@ public:
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}
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private:
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std::size_t ReadImpl(void* data, std::size_t length, std::size_t data_size) const;
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std::size_t WriteImpl(const void* data, std::size_t length, std::size_t data_size);
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std::FILE* m_file = nullptr;
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};
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