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//===- StreamInterface.h - Base interface for a stream of data --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_MSF_STREAMINTERFACE_H
#define LLVM_DEBUGINFO_MSF_STREAMINTERFACE_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/Error.h"
#include <cstdint>
namespace llvm {
namespace msf {
class ReadableStream {
public:
virtual ~ReadableStream() = default;
// Given an offset into the stream and a number of bytes, attempt to read
// the bytes and set the output ArrayRef to point to a reference into the
// stream, without copying any data.
virtual Error readBytes(uint32_t Offset, uint32_t Size,
ArrayRef<uint8_t> &Buffer) const = 0;
// Given an offset into the stream, read as much as possible without copying
// any data.
virtual Error readLongestContiguousChunk(uint32_t Offset,
ArrayRef<uint8_t> &Buffer) const = 0;
virtual uint32_t getLength() const = 0;
};
class WritableStream : public ReadableStream {
public:
~WritableStream() override = default;
// Attempt to write the given bytes into the stream at the desired offset.
// This will always necessitate a copy. Cannot shrink or grow the stream,
// only writes into existing allocated space.
virtual Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Data) const = 0;
virtual Error commit() const = 0;
};
} // end namespace msf
} // end namespace llvm
#endif // LLVM_DEBUGINFO_MSF_STREAMINTERFACE_H
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