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//===- ByteStream.cpp - Reads stream data from a byte sequence ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/Raw/ByteStream.h"
#include "llvm/DebugInfo/PDB/Raw/StreamReader.h"
using namespace llvm;
using namespace llvm::pdb;
ByteStream::ByteStream() : Owned(false) {}
ByteStream::ByteStream(MutableArrayRef<uint8_t> Bytes) : Owned(false) {
initialize(Bytes);
}
ByteStream::ByteStream(uint32_t Length) : Owned(false) { initialize(Length); }
ByteStream::~ByteStream() { reset(); }
void ByteStream::reset() {
if (Owned)
delete[] Data.data();
Owned = false;
Data = MutableArrayRef<uint8_t>();
}
void ByteStream::initialize(MutableArrayRef<uint8_t> Bytes) {
reset();
Data = Bytes;
Owned = false;
}
void ByteStream::initialize(uint32_t Length) {
reset();
Data = MutableArrayRef<uint8_t>(new uint8_t[Length], Length);
Owned = true;
}
std::error_code ByteStream::initialize(StreamReader &Reader, uint32_t Length) {
initialize(Length);
std::error_code EC = Reader.readBytes(Data);
if (EC)
reset();
return EC;
}
std::error_code ByteStream::readBytes(uint32_t Offset,
MutableArrayRef<uint8_t> Buffer) const {
if (Data.size() < Buffer.size() + Offset)
return std::make_error_code(std::errc::bad_address);
::memcpy(Buffer.data(), Data.data() + Offset, Buffer.size());
return std::error_code();
}
std::error_code ByteStream::getArrayRef(uint32_t Offset,
ArrayRef<uint8_t> &Buffer,
uint32_t Length) const {
if (Data.size() < Length + Offset)
return std::make_error_code(std::errc::bad_address);
Buffer = Data.slice(Offset, Length);
return std::error_code();
}
uint32_t ByteStream::getLength() const { return Data.size(); }
StringRef ByteStream::str() const {
const char *CharData = reinterpret_cast<const char *>(Data.data());
return StringRef(CharData, Data.size());
}
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