forked from OSchip/llvm-project
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//===- 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>;
|
|
}
|
|
}
|