1//===---- llvm/Support/DataStream.h - Lazy bitcode streaming ----*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This header defines DataStreamer, which fetches bytes of data from 11// a stream source. It provides support for streaming (lazy reading) of 12// data, e.g. bitcode 13// 14//===----------------------------------------------------------------------===// 15 16 17#ifndef LLVM_SUPPORT_DATASTREAM_H_ 18#define LLVM_SUPPORT_DATASTREAM_H_ 19 20#include <string> 21 22namespace llvm { 23 24class DataStreamer { 25public: 26 /// Fetch bytes [start-end) from the stream, and write them to the 27 /// buffer pointed to by buf. Returns the number of bytes actually written. 28 virtual size_t GetBytes(unsigned char *buf, size_t len) = 0; 29 30 virtual ~DataStreamer(); 31}; 32 33DataStreamer *getDataFileStreamer(const std::string &Filename, 34 std::string *Err); 35 36} 37 38#endif // LLVM_SUPPORT_DATASTREAM_H_ 39