mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-09 16:32:44 +01:00
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.
This commit is contained in:
parent
64b5985f0a
commit
e77337588e
2 changed files with 33 additions and 9 deletions
|
@ -967,6 +967,34 @@ bool IOFile::Flush() {
|
||||||
return IsOpen() && 0 == std::fflush(m_file);
|
return IsOpen() && 0 == std::fflush(m_file);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
std::size_t IOFile::ReadImpl(void* data, std::size_t length, std::size_t data_size) const {
|
||||||
|
if (!IsOpen()) {
|
||||||
|
return std::numeric_limits<std::size_t>::max();
|
||||||
|
}
|
||||||
|
|
||||||
|
if (length == 0) {
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
DEBUG_ASSERT(data != nullptr);
|
||||||
|
|
||||||
|
return std::fread(data, data_size, length, m_file);
|
||||||
|
}
|
||||||
|
|
||||||
|
std::size_t IOFile::WriteImpl(const void* data, std::size_t length, std::size_t data_size) {
|
||||||
|
if (!IsOpen()) {
|
||||||
|
return std::numeric_limits<std::size_t>::max();
|
||||||
|
}
|
||||||
|
|
||||||
|
if (length == 0) {
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
DEBUG_ASSERT(data != nullptr);
|
||||||
|
|
||||||
|
return std::fwrite(data, data_size, length, m_file);
|
||||||
|
}
|
||||||
|
|
||||||
bool IOFile::Resize(u64 size) {
|
bool IOFile::Resize(u64 size) {
|
||||||
return IsOpen() && 0 ==
|
return IsOpen() && 0 ==
|
||||||
#ifdef _WIN32
|
#ifdef _WIN32
|
||||||
|
|
|
@ -222,22 +222,15 @@ public:
|
||||||
static_assert(std::is_trivially_copyable_v<T>,
|
static_assert(std::is_trivially_copyable_v<T>,
|
||||||
"Given array does not consist of trivially copyable objects");
|
"Given array does not consist of trivially copyable objects");
|
||||||
|
|
||||||
if (!IsOpen()) {
|
return ReadImpl(data, length, sizeof(T));
|
||||||
return std::numeric_limits<std::size_t>::max();
|
|
||||||
}
|
|
||||||
|
|
||||||
return std::fread(data, sizeof(T), length, m_file);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
template <typename T>
|
template <typename T>
|
||||||
std::size_t WriteArray(const T* data, std::size_t length) {
|
std::size_t WriteArray(const T* data, std::size_t length) {
|
||||||
static_assert(std::is_trivially_copyable_v<T>,
|
static_assert(std::is_trivially_copyable_v<T>,
|
||||||
"Given array does not consist of trivially copyable objects");
|
"Given array does not consist of trivially copyable objects");
|
||||||
if (!IsOpen()) {
|
|
||||||
return std::numeric_limits<std::size_t>::max();
|
|
||||||
}
|
|
||||||
|
|
||||||
return std::fwrite(data, sizeof(T), length, m_file);
|
return WriteImpl(data, length, sizeof(T));
|
||||||
}
|
}
|
||||||
|
|
||||||
template <typename T>
|
template <typename T>
|
||||||
|
@ -278,6 +271,9 @@ public:
|
||||||
}
|
}
|
||||||
|
|
||||||
private:
|
private:
|
||||||
|
std::size_t ReadImpl(void* data, std::size_t length, std::size_t data_size) const;
|
||||||
|
std::size_t WriteImpl(const void* data, std::size_t length, std::size_t data_size);
|
||||||
|
|
||||||
std::FILE* m_file = nullptr;
|
std::FILE* m_file = nullptr;
|
||||||
};
|
};
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue