blob: 535e8fde6f66e08d8b860a6d867856585b1c475c [file] [log] [blame]
// Copyright 2018 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "core/fxcrt/compiler_specific.h"
#include "core/fxcrt/fx_memory_wrappers.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/span.h"
class CFX_CodecMemory final : public Retainable {
// Returns a span over the unconsumed contents of the buffer.
pdfium::span<uint8_t> GetUnconsumedSpan() {
return GetBufferSpan().subspan(pos_);
// SAFETY: `size_` must track `buffer_` allocations.
pdfium::span<uint8_t> GetBufferSpan() {
return UNSAFE_BUFFERS(pdfium::make_span(buffer_.get(), size_));
size_t GetSize() const { return size_; }
size_t GetPosition() const { return pos_; }
bool IsEOF() const { return pos_ >= size_; }
size_t ReadBlock(pdfium::span<uint8_t> buffer);
// Sets the cursor position to |pos| if possible.
bool Seek(size_t pos);
// Try to change the size of the buffer, keep the old one on failure.
bool TryResize(size_t new_buffer_size);
// Schlep the bytes down the buffer.
void Consume(size_t consumed);
explicit CFX_CodecMemory(size_t buffer_size);
~CFX_CodecMemory() override;
// TODO(tsepez): convert to a fixed array type.
std::unique_ptr<uint8_t, FxFreeDeleter> buffer_;
size_t size_ = 0;
size_t pos_ = 0;