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//===- StreamReader.h - Reads bytes and objects from a stream ---*- 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_STREAMREADER_H
#define LLVM_DEBUGINFO_MSF_STREAMREADER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/DebugInfo/MSF/MSFError.h"
#include "llvm/DebugInfo/MSF/StreamArray.h"
#include "llvm/DebugInfo/MSF/StreamInterface.h"
#include "llvm/DebugInfo/MSF/StreamRef.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <string>
namespace llvm {
namespace msf {
class StreamReader {
public:
StreamReader(ReadableStreamRef Stream);
Error readLongestContiguousChunk(ArrayRef<uint8_t> &Buffer);
Error readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size);
Error readInteger(uint8_t &Dest);
Error readInteger(uint16_t &Dest);
Error readInteger(uint32_t &Dest);
Error readInteger(uint64_t &Dest);
Error readInteger(int8_t &Dest);
Error readInteger(int16_t &Dest);
Error readInteger(int32_t &Dest);
Error readInteger(int64_t &Dest);
Error readZeroString(StringRef &Dest);
Error readFixedString(StringRef &Dest, uint32_t Length);
Error readStreamRef(ReadableStreamRef &Ref);
Error readStreamRef(ReadableStreamRef &Ref, uint32_t Length);
template <typename T> Error readEnum(T &Dest) {
typename std::underlying_type<T>::type N;
if (auto EC = readInteger(N))
return EC;
Dest = static_cast<T>(N);
return Error::success();
}
template <typename T> Error readObject(const T *&Dest) {
ArrayRef<uint8_t> Buffer;
if (auto EC = readBytes(Buffer, sizeof(T)))
return EC;
Dest = reinterpret_cast<const T *>(Buffer.data());
return Error::success();
}
template <typename T>
Error readArray(ArrayRef<T> &Array, uint32_t NumElements) {
ArrayRef<uint8_t> Bytes;
if (NumElements == 0) {
Array = ArrayRef<T>();
return Error::success();
}
if (NumElements > UINT32_MAX / sizeof(T))
return make_error<MSFError>(msf_error_code::insufficient_buffer);
if (auto EC = readBytes(Bytes, NumElements * sizeof(T)))
return EC;
Array = ArrayRef<T>(reinterpret_cast<const T *>(Bytes.data()), NumElements);
return Error::success();
}
template <typename T, typename U>
Error readArray(VarStreamArray<T, U> &Array, uint32_t Size) {
ReadableStreamRef S;
if (auto EC = readStreamRef(S, Size))
return EC;
Array = VarStreamArray<T, U>(S, Array.getExtractor());
return Error::success();
}
template <typename T>
Error readArray(FixedStreamArray<T> &Array, uint32_t NumItems) {
if (NumItems == 0) {
Array = FixedStreamArray<T>();
return Error::success();
}
uint32_t Length = NumItems * sizeof(T);
if (Length / sizeof(T) != NumItems)
return make_error<MSFError>(msf_error_code::invalid_format);
if (Offset + Length > Stream.getLength())
return make_error<MSFError>(msf_error_code::insufficient_buffer);
ReadableStreamRef View = Stream.slice(Offset, Length);
Array = FixedStreamArray<T>(View);
Offset += Length;
return Error::success();
}
bool empty() const { return bytesRemaining() == 0; }
void setOffset(uint32_t Off) { Offset = Off; }
uint32_t getOffset() const { return Offset; }
uint32_t getLength() const { return Stream.getLength(); }
uint32_t bytesRemaining() const { return getLength() - getOffset(); }
Error skip(uint32_t Amount);
uint8_t peek() const;
private:
ReadableStreamRef Stream;
uint32_t Offset;
};
} // namespace msf
} // namespace llvm
#endif // LLVM_DEBUGINFO_MSF_STREAMREADER_H
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