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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/io_buffer.h"
#include <utility>
#include "base/check_op.h"
#include "base/numerics/safe_math.h"
namespace net {
// TODO(eroman): IOBuffer is being converted to require buffer sizes and offsets
// be specified as "size_t" rather than "int" (crbug.com/488553). To facilitate
// this move (since LOTS of code needs to be updated), this function ensures
// that sizes can be safely converted to an "int" without truncation. The
// assert ensures calling this with an "int" argument is also safe.
void IOBuffer::AssertValidBufferSize(size_t size) {
static_assert(sizeof(size_t) >= sizeof(int));
base::CheckedNumeric<int>(size).ValueOrDie();
}
IOBuffer::IOBuffer() = default;
IOBuffer::IOBuffer(size_t buffer_size) {
AssertValidBufferSize(buffer_size);
if (buffer_size) {
data_ = new char[buffer_size];
}
}
IOBuffer::IOBuffer(char* data)
: data_(data) {
}
IOBuffer::~IOBuffer() {
data_.ClearAndDeleteArray();
}
IOBufferWithSize::IOBufferWithSize(size_t size) : IOBuffer(size), size_(size) {
// Note: Size check is done in superclass' constructor.
}
IOBufferWithSize::IOBufferWithSize(char* data, size_t size)
: IOBuffer(data), size_(size) {
AssertValidBufferSize(size);
}
IOBufferWithSize::~IOBufferWithSize() = default;
StringIOBuffer::StringIOBuffer(std::string s) : string_data_(std::move(s)) {
AssertValidBufferSize(string_data_.size());
data_ = string_data_.data();
}
StringIOBuffer::~StringIOBuffer() {
// We haven't allocated the buffer, so remove it before the base class
// destructor tries to delete[] it.
data_ = nullptr;
}
DrainableIOBuffer::DrainableIOBuffer(scoped_refptr<IOBuffer> base, size_t size)
: IOBuffer(base->data()), base_(std::move(base)), size_(size) {
AssertValidBufferSize(size);
}
void DrainableIOBuffer::DidConsume(int bytes) {
SetOffset(used_ + bytes);
}
int DrainableIOBuffer::BytesRemaining() const {
return size_ - used_;
}
// Returns the number of consumed bytes.
int DrainableIOBuffer::BytesConsumed() const {
return used_;
}
void DrainableIOBuffer::SetOffset(int bytes) {
CHECK_GE(bytes, 0);
CHECK_LE(bytes, size_);
used_ = bytes;
data_ = base_->data() + used_;
}
DrainableIOBuffer::~DrainableIOBuffer() {
// The buffer is owned by the |base_| instance.
data_ = nullptr;
}
GrowableIOBuffer::GrowableIOBuffer() = default;
void GrowableIOBuffer::SetCapacity(int capacity) {
CHECK_GE(capacity, 0);
// this will get reset in `set_offset`.
data_ = nullptr;
// realloc will crash if it fails.
real_data_.reset(static_cast<char*>(realloc(real_data_.release(), capacity)));
capacity_ = capacity;
if (offset_ > capacity)
set_offset(capacity);
else
set_offset(offset_); // The pointer may have changed.
}
void GrowableIOBuffer::set_offset(int offset) {
CHECK_GE(offset, 0);
CHECK_LE(offset, capacity_);
offset_ = offset;
data_ = real_data_.get() + offset;
}
int GrowableIOBuffer::RemainingCapacity() {
return capacity_ - offset_;
}
char* GrowableIOBuffer::StartOfBuffer() {
return real_data_.get();
}
GrowableIOBuffer::~GrowableIOBuffer() {
data_ = nullptr;
}
PickledIOBuffer::PickledIOBuffer() : IOBuffer() {
}
void PickledIOBuffer::Done() {
data_ = const_cast<char*>(pickle_.data_as_char());
}
PickledIOBuffer::~PickledIOBuffer() {
data_ = nullptr;
}
WrappedIOBuffer::WrappedIOBuffer(const char* data, size_t size)
: IOBufferWithSize(const_cast<char*>(data), size) {}
WrappedIOBuffer::~WrappedIOBuffer() {
data_ = nullptr;
}
} // namespace net
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