forked from OSchip/llvm-project
				
			
		
			
				
	
	
		
			92 lines
		
	
	
		
			2.9 KiB
		
	
	
	
		
			C++
		
	
	
	
			
		
		
	
	
			92 lines
		
	
	
		
			2.9 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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| 
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| #include "llvm/Support/BinaryStreamWriter.h"
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| 
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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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| 
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| using namespace llvm;
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| 
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| BinaryStreamWriter::BinaryStreamWriter(WritableBinaryStreamRef Ref)
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|     : Stream(Ref) {}
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| 
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| BinaryStreamWriter::BinaryStreamWriter(WritableBinaryStream &Stream)
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|     : Stream(Stream) {}
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| 
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| BinaryStreamWriter::BinaryStreamWriter(MutableArrayRef<uint8_t> Data,
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|                                        llvm::support::endianness Endian)
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|     : Stream(Data, Endian) {}
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| 
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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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| 
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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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| 
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|   return Error::success();
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| }
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| 
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| Error BinaryStreamWriter::writeFixedString(StringRef Str) {
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| 
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|   return writeBytes(arrayRefFromStringRef(Str));
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| }
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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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| 
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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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| 
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| std::pair<BinaryStreamWriter, BinaryStreamWriter>
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| BinaryStreamWriter::split(uint32_t Off) const {
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|   assert(getLength() >= Off);
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| 
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|   WritableBinaryStreamRef First = Stream.drop_front(Offset);
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| 
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|   WritableBinaryStreamRef Second = First.drop_front(Off);
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|   First = First.keep_front(Off);
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|   BinaryStreamWriter W1{First};
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|   BinaryStreamWriter W2{Second};
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|   return std::make_pair(W1, W2);
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| }
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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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|   while (Offset < NewOffset)
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|     if (auto EC = writeInteger('\0'))
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|       return EC;
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|   return Error::success();
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| }
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