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213d3d3c81
We have need to reuse this functionality, including making additional generic stream types that are smarter about how and when they copy memory versus referencing the original memory. So all of these structures belong in the common library rather than being pdb specific. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270751 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.1 KiB
C++
73 lines
2.1 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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ByteStream::ByteStream() {}
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ByteStream::ByteStream(MutableArrayRef<uint8_t> Bytes) { initialize(Bytes); }
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ByteStream::ByteStream(uint32_t Length) { initialize(Length); }
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ByteStream::~ByteStream() { reset(); }
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void ByteStream::reset() {
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Ownership.reset();
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Data = MutableArrayRef<uint8_t>();
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}
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void ByteStream::initialize(MutableArrayRef<uint8_t> Bytes) {
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reset();
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Data = Bytes;
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}
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void ByteStream::initialize(uint32_t Length) {
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reset();
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if (Length > 0)
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Data = MutableArrayRef<uint8_t>(new uint8_t[Length], Length);
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Ownership.reset(Data.data());
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}
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Error ByteStream::initialize(StreamReader &Reader, uint32_t Length) {
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initialize(Length);
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auto EC = Reader.readBytes(Data);
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if (EC)
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reset();
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return EC;
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}
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Error ByteStream::readBytes(uint32_t Offset,
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MutableArrayRef<uint8_t> Buffer) const {
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if (Data.size() < Buffer.size() + Offset)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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::memcpy(Buffer.data(), Data.data() + Offset, Buffer.size());
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return Error::success();
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}
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Error ByteStream::getArrayRef(uint32_t Offset, ArrayRef<uint8_t> &Buffer,
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uint32_t Length) const {
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if (Data.size() < Length + Offset)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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Buffer = Data.slice(Offset, Length);
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return Error::success();
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}
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uint32_t ByteStream::getLength() const { return Data.size(); }
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StringRef ByteStream::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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