94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
//===- StreamReader.cpp - Reads bytes and objects from a stream -----------===//
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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/StreamReader.h"
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#include "llvm/DebugInfo/CodeView/CodeViewError.h"
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#include "llvm/DebugInfo/CodeView/StreamRef.h"
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using namespace llvm;
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using namespace llvm::codeview;
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StreamReader::StreamReader(StreamRef S) : Stream(S), Offset(0) {}
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Error StreamReader::readLongestContiguousChunk(ArrayRef<uint8_t> &Buffer) {
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if (auto EC = Stream.readLongestContiguousChunk(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 StreamReader::readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size) {
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if (auto EC = Stream.readBytes(Offset, Size, Buffer))
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return EC;
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Offset += Size;
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return Error::success();
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}
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Error StreamReader::readInteger(uint16_t &Dest) {
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const support::ulittle16_t *P;
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if (auto EC = readObject(P))
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return EC;
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Dest = *P;
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return Error::success();
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}
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Error StreamReader::readInteger(uint32_t &Dest) {
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const support::ulittle32_t *P;
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if (auto EC = readObject(P))
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return EC;
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Dest = *P;
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return Error::success();
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}
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Error StreamReader::readZeroString(StringRef &Dest) {
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uint32_t Length = 0;
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// First compute the length of the string by reading 1 byte at a time.
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uint32_t OriginalOffset = getOffset();
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const char *C;
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do {
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if (auto EC = readObject(C))
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return EC;
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if (*C != '\0')
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++Length;
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} while (*C != '\0');
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// Now go back and request a reference for that many bytes.
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uint32_t NewOffset = getOffset();
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setOffset(OriginalOffset);
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ArrayRef<uint8_t> Data;
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if (auto EC = readBytes(Data, Length))
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return EC;
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Dest = StringRef(reinterpret_cast<const char *>(Data.begin()), Data.size());
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// Now set the offset back to where it was after we calculated the length.
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setOffset(NewOffset);
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return Error::success();
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}
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Error StreamReader::readFixedString(StringRef &Dest, uint32_t Length) {
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ArrayRef<uint8_t> Bytes;
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if (auto EC = readBytes(Bytes, Length))
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return EC;
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Dest = StringRef(reinterpret_cast<const char *>(Bytes.begin()), Bytes.size());
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return Error::success();
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}
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Error StreamReader::readStreamRef(StreamRef &Ref) {
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return readStreamRef(Ref, bytesRemaining());
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}
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Error StreamReader::readStreamRef(StreamRef &Ref, uint32_t Length) {
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if (bytesRemaining() < Length)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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Ref = Stream.slice(Offset, Length);
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Offset += Length;
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return Error::success();
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}
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