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5e117855c3
Previously this change was submitted from a Windows machine, so changes made to the case of filenames and directory names did not survive the commit, and as a result the CMake source file names and the on-disk file names did not match on case-sensitive file systems. I'm resubmitting this patch from a Linux system, which hopefully allows the case changes to make it through unfettered. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277213 91177308-0d34-0410-b5e6-96231b3b80d8
111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
//===- StreamReader.h - Reads bytes and objects from a stream ---*- C++ -*-===//
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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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#ifndef LLVM_DEBUGINFO_MSF_STREAMREADER_H
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#define LLVM_DEBUGINFO_MSF_STREAMREADER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/MSF/MSFError.h"
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#include "llvm/DebugInfo/MSF/StreamArray.h"
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#include "llvm/DebugInfo/MSF/StreamInterface.h"
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#include "llvm/DebugInfo/MSF/StreamRef.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include <string>
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namespace llvm {
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namespace msf {
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class StreamReader {
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public:
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StreamReader(ReadableStreamRef Stream);
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Error readLongestContiguousChunk(ArrayRef<uint8_t> &Buffer);
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Error readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size);
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Error readInteger(uint16_t &Dest);
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Error readInteger(uint32_t &Dest);
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Error readZeroString(StringRef &Dest);
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Error readFixedString(StringRef &Dest, uint32_t Length);
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Error readStreamRef(ReadableStreamRef &Ref);
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Error readStreamRef(ReadableStreamRef &Ref, uint32_t Length);
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template <typename T> Error readEnum(T &Dest) {
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typename std::underlying_type<T>::type N;
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if (auto EC = readInteger(N))
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return EC;
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Dest = static_cast<T>(N);
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return Error::success();
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}
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template <typename T> Error readObject(const T *&Dest) {
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ArrayRef<uint8_t> Buffer;
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if (auto EC = readBytes(Buffer, sizeof(T)))
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return EC;
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Dest = reinterpret_cast<const T *>(Buffer.data());
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return Error::success();
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}
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template <typename T>
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Error readArray(ArrayRef<T> &Array, uint32_t NumElements) {
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ArrayRef<uint8_t> Bytes;
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if (NumElements == 0) {
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Array = ArrayRef<T>();
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return Error::success();
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}
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if (NumElements > UINT32_MAX / sizeof(T))
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return make_error<MSFError>(msf_error_code::insufficient_buffer);
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if (auto EC = readBytes(Bytes, NumElements * sizeof(T)))
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return EC;
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Array = ArrayRef<T>(reinterpret_cast<const T *>(Bytes.data()), NumElements);
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return Error::success();
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}
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template <typename T, typename U>
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Error readArray(VarStreamArray<T, U> &Array, uint32_t Size) {
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ReadableStreamRef S;
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if (auto EC = readStreamRef(S, Size))
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return EC;
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Array = VarStreamArray<T, U>(S, Array.getExtractor());
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return Error::success();
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}
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template <typename T>
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Error readArray(FixedStreamArray<T> &Array, uint32_t NumItems) {
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if (NumItems == 0) {
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Array = FixedStreamArray<T>();
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return Error::success();
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}
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uint32_t Length = NumItems * sizeof(T);
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if (Length / sizeof(T) != NumItems)
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return make_error<MSFError>(msf_error_code::invalid_format);
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if (Offset + Length > Stream.getLength())
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return make_error<MSFError>(msf_error_code::insufficient_buffer);
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ReadableStreamRef View = Stream.slice(Offset, Length);
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Array = FixedStreamArray<T>(View);
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Offset += Length;
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return Error::success();
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}
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void setOffset(uint32_t Off) { Offset = Off; }
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uint32_t getOffset() const { return Offset; }
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uint32_t getLength() const { return Stream.getLength(); }
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uint32_t bytesRemaining() const { return getLength() - getOffset(); }
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private:
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ReadableStreamRef Stream;
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uint32_t Offset;
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};
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} // namespace msf
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} // namespace llvm
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#endif // LLVM_DEBUGINFO_MSF_STREAMREADER_H
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