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#include "cru/common/Buffer.h"
#include <cstring>
#include "cru/common/Exception.h"
namespace cru {
namespace {
void CheckSize(Index size) {
if (size < 0) {
throw Exception(u"Size of buffer can't be smaller than 0.");
}
}
} // namespace
Buffer::Buffer(Index size) {
CheckSize(size);
if (size == 0) {
ptr_ = nullptr;
size_ = used_size_ = 0;
} else {
ptr_ = new std::byte[size];
size_ = size;
used_size_ = 0;
}
}
Buffer::Buffer(const Buffer& other) { Copy_(other); }
Buffer::Buffer(Buffer&& other) noexcept { Move_(std::move(other)); }
Buffer& Buffer::operator=(const Buffer& other) {
if (this != &other) {
Delete_();
Copy_(other);
}
return *this;
}
Buffer& Buffer::operator=(Buffer&& other) noexcept {
if (this != &other) {
Delete_();
Move_(std::move(other));
}
return *this;
}
Buffer::~Buffer() { Delete_(); }
void Buffer::AssignBytes(Index dst_offset, std::byte* src, Index src_offset,
Index src_size) {
std::memcpy(ptr_ + dst_offset, src + src_offset, src_size);
}
void Buffer::SetUsedSize(Index new_size) { used_size_ = new_size; }
void Buffer::ResizeBuffer(Index new_size, bool preserve_used) {
if (new_size == 0) {
Delete_();
ptr_ = nullptr;
size_ = used_size_ = 0;
return;
}
auto old_ptr = ptr_;
ptr_ = new std::byte[new_size];
size_ = new_size;
if (old_ptr) {
if (preserve_used) {
auto copy_size = std::min(used_size_, new_size);
std::memcpy(ptr_, old_ptr, copy_size);
used_size_ = copy_size;
}
delete[] old_ptr;
}
}
Index Buffer::PushEnd(std::byte* other, Index other_size) {
auto copy_size = std::min(GetRestSize(), other_size);
if (copy_size) {
std::memcpy(GetUsedEndPtr(), other, copy_size);
used_size_ += copy_size;
}
return copy_size;
}
Index Buffer::PopEnd(Index size) {
if (used_size_ < size) {
used_size_ = 0;
return used_size_;
} else {
used_size_ -= size;
return size;
}
}
void Buffer::Copy_(const Buffer& other) {
if (other.ptr_ == nullptr) {
ptr_ = nullptr;
size_ = used_size_ = 0;
} else {
ptr_ = new std::byte[other.size_];
size_ = other.size_;
used_size_ = other.used_size_;
std::memcpy(ptr_, other.ptr_, used_size_);
}
}
void Buffer::Move_(Buffer&& other) noexcept {
ptr_ = other.ptr_;
size_ = other.size_;
used_size_ = other.used_size_;
other.ptr_ = nullptr;
other.size_ = other.used_size_ = 0;
}
void Buffer::Delete_() noexcept {
if (ptr_) {
delete[] ptr_;
}
}
} // namespace cru
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