80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//===- ByteStream.cpp - Reads stream data from a byte sequence ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/CodeView/ByteStream.h"
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#include "llvm/DebugInfo/CodeView/CodeViewError.h"
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#include "llvm/DebugInfo/CodeView/StreamReader.h"
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#include <cstring>
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using namespace llvm;
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using namespace llvm::codeview;
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static Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Src,
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ArrayRef<uint8_t> Dest) {
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return make_error<CodeViewError>(cv_error_code::operation_unsupported,
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"ByteStream is immutable.");
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}
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static Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Src,
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MutableArrayRef<uint8_t> Dest) {
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if (Dest.size() < Src.size())
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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if (Offset > Src.size() - Dest.size())
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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::memcpy(Dest.data() + Offset, Src.data(), Src.size());
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return Error::success();
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}
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template <bool Writable>
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Error ByteStream<Writable>::readBytes(uint32_t Offset, uint32_t Size,
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ArrayRef<uint8_t> &Buffer) const {
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if (Offset > Data.size())
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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if (Data.size() < Size + Offset)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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Buffer = Data.slice(Offset, Size);
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return Error::success();
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}
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template <bool Writable>
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Error ByteStream<Writable>::readLongestContiguousChunk(
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uint32_t Offset, ArrayRef<uint8_t> &Buffer) const {
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if (Offset >= Data.size())
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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Buffer = Data.slice(Offset);
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return Error::success();
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}
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template <bool Writable>
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Error ByteStream<Writable>::writeBytes(uint32_t Offset,
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ArrayRef<uint8_t> Buffer) const {
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return ::writeBytes(Offset, Buffer, Data);
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}
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template <bool Writable> uint32_t ByteStream<Writable>::getLength() const {
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return Data.size();
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}
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template <bool Writable> Error ByteStream<Writable>::commit() const {
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return Error::success();
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}
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template <bool Writable> StringRef ByteStream<Writable>::str() const {
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const char *CharData = reinterpret_cast<const char *>(Data.data());
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return StringRef(CharData, Data.size());
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}
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namespace llvm {
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namespace codeview {
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template class ByteStream<true>;
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template class ByteStream<false>;
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}
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}
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