forked from OSchip/llvm-project
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===- BinaryStreamWriter.cpp - Writes objects to a BinaryStream ----------===//
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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/BinaryStreamWriter.h"
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#include "llvm/Support/BinaryStreamError.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/BinaryStreamRef.h"
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using namespace llvm;
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BinaryStreamWriter::BinaryStreamWriter(WritableBinaryStreamRef S)
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: Stream(S), Offset(0) {}
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Error BinaryStreamWriter::writeBytes(ArrayRef<uint8_t> Buffer) {
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if (auto EC = Stream.writeBytes(Offset, Buffer))
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return EC;
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Offset += Buffer.size();
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return Error::success();
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}
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Error BinaryStreamWriter::writeCString(StringRef Str) {
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if (auto EC = writeFixedString(Str))
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return EC;
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if (auto EC = writeObject('\0'))
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return EC;
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return Error::success();
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}
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Error BinaryStreamWriter::writeFixedString(StringRef Str) {
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return writeBytes(ArrayRef<uint8_t>(Str.bytes_begin(), Str.bytes_end()));
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}
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Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref) {
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return writeStreamRef(Ref, Ref.getLength());
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}
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Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref, uint32_t Length) {
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BinaryStreamReader SrcReader(Ref.slice(0, Length));
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// This is a bit tricky. If we just call readBytes, we are requiring that it
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// return us the entire stream as a contiguous buffer. There is no guarantee
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// this can be satisfied by returning a reference straight from the buffer, as
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// an implementation may not store all data in a single contiguous buffer. So
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// we iterate over each contiguous chunk, writing each one in succession.
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while (SrcReader.bytesRemaining() > 0) {
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ArrayRef<uint8_t> Chunk;
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if (auto EC = SrcReader.readLongestContiguousChunk(Chunk))
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return EC;
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if (auto EC = writeBytes(Chunk))
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return EC;
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}
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return Error::success();
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}
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Error BinaryStreamWriter::padToAlignment(uint32_t Align) {
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uint32_t NewOffset = alignTo(Offset, Align);
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if (NewOffset > getLength())
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return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
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Offset = NewOffset;
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return Error::success();
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}
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