forked from OSchip/llvm-project
132 lines
4.7 KiB
C++
132 lines
4.7 KiB
C++
//===- BinaryStreamRef.cpp - ----------------------------------------------===//
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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/Support/BinaryStreamRef.h"
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#include "llvm/Support/BinaryByteStream.h"
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using namespace llvm;
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using namespace llvm::support;
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namespace {
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class ArrayRefImpl : public BinaryStream {
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public:
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ArrayRefImpl(ArrayRef<uint8_t> Data, endianness Endian) : BBS(Data, Endian) {}
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llvm::support::endianness getEndian() const override {
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return BBS.getEndian();
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}
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Error readBytes(uint32_t Offset, uint32_t Size,
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ArrayRef<uint8_t> &Buffer) override {
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return BBS.readBytes(Offset, Size, Buffer);
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}
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Error readLongestContiguousChunk(uint32_t Offset,
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ArrayRef<uint8_t> &Buffer) override {
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return BBS.readLongestContiguousChunk(Offset, Buffer);
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}
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uint32_t getLength() override { return BBS.getLength(); }
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private:
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BinaryByteStream BBS;
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};
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class MutableArrayRefImpl : public WritableBinaryStream {
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public:
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MutableArrayRefImpl(MutableArrayRef<uint8_t> Data, endianness Endian)
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: BBS(Data, Endian) {}
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// Inherited via WritableBinaryStream
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llvm::support::endianness getEndian() const override {
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return BBS.getEndian();
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}
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Error readBytes(uint32_t Offset, uint32_t Size,
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ArrayRef<uint8_t> &Buffer) override {
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return BBS.readBytes(Offset, Size, Buffer);
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}
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Error readLongestContiguousChunk(uint32_t Offset,
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ArrayRef<uint8_t> &Buffer) override {
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return BBS.readLongestContiguousChunk(Offset, Buffer);
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}
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uint32_t getLength() override { return BBS.getLength(); }
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Error writeBytes(uint32_t Offset, ArrayRef<uint8_t> Data) override {
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return BBS.writeBytes(Offset, Data);
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}
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Error commit() override { return BBS.commit(); }
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private:
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MutableBinaryByteStream BBS;
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};
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}
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BinaryStreamRef::BinaryStreamRef(BinaryStream &Stream)
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: BinaryStreamRef(Stream, 0, Stream.getLength()) {}
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BinaryStreamRef::BinaryStreamRef(BinaryStream &Stream, uint32_t Offset,
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uint32_t Length)
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: BinaryStreamRefBase(Stream, Offset, Length) {}
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BinaryStreamRef::BinaryStreamRef(ArrayRef<uint8_t> Data, endianness Endian)
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: BinaryStreamRefBase(std::make_shared<ArrayRefImpl>(Data, Endian), 0,
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Data.size()) {}
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BinaryStreamRef::BinaryStreamRef(StringRef Data, endianness Endian)
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: BinaryStreamRef(makeArrayRef(Data.bytes_begin(), Data.bytes_end()),
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Endian) {}
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Error BinaryStreamRef::readBytes(uint32_t Offset, uint32_t Size,
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ArrayRef<uint8_t> &Buffer) const {
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if (auto EC = checkOffset(Offset, Size))
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return EC;
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return BorrowedImpl->readBytes(ViewOffset + Offset, Size, Buffer);
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}
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Error BinaryStreamRef::readLongestContiguousChunk(
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uint32_t Offset, ArrayRef<uint8_t> &Buffer) const {
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if (auto EC = checkOffset(Offset, 1))
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return EC;
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if (auto EC =
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BorrowedImpl->readLongestContiguousChunk(ViewOffset + Offset, Buffer))
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return EC;
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// This StreamRef might refer to a smaller window over a larger stream. In
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// that case we will have read out more bytes than we should return, because
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// we should not read past the end of the current view.
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uint32_t MaxLength = Length - Offset;
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if (Buffer.size() > MaxLength)
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Buffer = Buffer.slice(0, MaxLength);
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return Error::success();
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}
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WritableBinaryStreamRef::WritableBinaryStreamRef(WritableBinaryStream &Stream)
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: WritableBinaryStreamRef(Stream, 0, Stream.getLength()) {}
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WritableBinaryStreamRef::WritableBinaryStreamRef(WritableBinaryStream &Stream,
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uint32_t Offset,
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uint32_t Length)
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: BinaryStreamRefBase(Stream, Offset, Length) {}
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WritableBinaryStreamRef::WritableBinaryStreamRef(MutableArrayRef<uint8_t> Data,
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endianness Endian)
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: BinaryStreamRefBase(std::make_shared<MutableArrayRefImpl>(Data, Endian),
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0, Data.size()) {}
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Error WritableBinaryStreamRef::writeBytes(uint32_t Offset,
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ArrayRef<uint8_t> Data) const {
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if (auto EC = checkOffset(Offset, Data.size()))
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return EC;
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return BorrowedImpl->writeBytes(ViewOffset + Offset, Data);
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}
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WritableBinaryStreamRef::operator BinaryStreamRef() const {
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return BinaryStreamRef(*BorrowedImpl, ViewOffset, Length);
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}
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/// \brief For buffered streams, commits changes to the backing store.
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Error WritableBinaryStreamRef::commit() { return BorrowedImpl->commit(); }
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