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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/CodeView/ByteStream.h"
#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/DebugInfo/CodeView/StreamReader.h"
#include <cstring>
using namespace llvm;
using namespace llvm::codeview;
ByteStream::ByteStream() {}
ByteStream::ByteStream(MutableArrayRef<uint8_t> Data) : Data(Data) {}
ByteStream::~ByteStream() {}
void ByteStream::reset() {
Ownership.reset();
Data = MutableArrayRef<uint8_t>();
}
void ByteStream::load(uint32_t Length) {
reset();
if (Length > 0)
Data = MutableArrayRef<uint8_t>(new uint8_t[Length], Length);
Ownership.reset(Data.data());
}
Error ByteStream::load(StreamReader &Reader, uint32_t Length) {
load(Length);
auto EC = Reader.readBytes(Data);
if (EC)
reset();
return EC;
}
Error ByteStream::readBytes(uint32_t Offset,
MutableArrayRef<uint8_t> Buffer) const {
if (Data.size() < Buffer.size() + Offset)
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
::memcpy(Buffer.data() + Offset, Data.data(), Buffer.size());
return Error::success();
}
Error ByteStream::readBytes(uint32_t Offset, uint32_t Size,
ArrayRef<uint8_t> &Buffer) const {
if (Data.size() < Buffer.size() + Offset)
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
Buffer = Data.slice(Offset, Size);
return Error::success();
}
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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