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 22 namespace llvm { 23 24 class DataStreamer { 25 public: 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 33 DataStreamer *getDataFileStreamer(const std::string &Filename, 34 std::string *Err); 35 36 } 37 38 #endif // LLVM_SUPPORT_DATASTREAM_H_ 39