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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;
static Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Src,
ArrayRef<uint8_t> Dest) {
return make_error<CodeViewError>(cv_error_code::operation_unsupported,
"ByteStream is immutable.");
}
static Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Src,
MutableArrayRef<uint8_t> Dest) {
if (Dest.size() < Src.size())
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
if (Offset > Src.size() - Dest.size())
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
::memcpy(Dest.data() + Offset, Src.data(), Src.size());
return Error::success();
}
template <bool Writable>
Error ByteStream<Writable>::readBytes(uint32_t Offset, uint32_t Size,
ArrayRef<uint8_t> &Buffer) const {
if (Offset > Data.size())
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
if (Data.size() < Size + Offset)
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
Buffer = Data.slice(Offset, Size);
return Error::success();
}
template <bool Writable>
Error ByteStream<Writable>::readLongestContiguousChunk(
uint32_t Offset, ArrayRef<uint8_t> &Buffer) const {
if (Offset >= Data.size())
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
Buffer = Data.slice(Offset);
return Error::success();
}
template <bool Writable>
Error ByteStream<Writable>::writeBytes(uint32_t Offset,
ArrayRef<uint8_t> Buffer) const {
return ::writeBytes(Offset, Buffer, Data);
}
template <bool Writable> uint32_t ByteStream<Writable>::getLength() const {
return Data.size();
}
template <bool Writable> Error ByteStream<Writable>::commit() const {
return Error::success();
}
template <bool Writable> StringRef ByteStream<Writable>::str() const {
const char *CharData = reinterpret_cast<const char *>(Data.data());
return StringRef(CharData, Data.size());
}
namespace llvm {
namespace codeview {
template class ByteStream<true>;
template class ByteStream<false>;
}
}
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