1234285Sdim//===---- llvm/Support/DataStream.h - Lazy bitcode streaming ----*- C++ -*-===// 2234285Sdim// 3234285Sdim// The LLVM Compiler Infrastructure 4234285Sdim// 5234285Sdim// This file is distributed under the University of Illinois Open Source 6234285Sdim// License. See LICENSE.TXT for details. 7234285Sdim// 8234285Sdim//===----------------------------------------------------------------------===// 9234285Sdim// 10234285Sdim// This header defines DataStreamer, which fetches bytes of data from 11234285Sdim// a stream source. It provides support for streaming (lazy reading) of 12234285Sdim// data, e.g. bitcode 13234285Sdim// 14234285Sdim//===----------------------------------------------------------------------===// 15234285Sdim 16234285Sdim 17249423Sdim#ifndef LLVM_SUPPORT_DATASTREAM_H 18249423Sdim#define LLVM_SUPPORT_DATASTREAM_H 19234285Sdim 20234285Sdim#include <string> 21234285Sdim 22234285Sdimnamespace llvm { 23234285Sdim 24234285Sdimclass DataStreamer { 25234285Sdimpublic: 26234285Sdim /// Fetch bytes [start-end) from the stream, and write them to the 27234285Sdim /// buffer pointed to by buf. Returns the number of bytes actually written. 28234285Sdim virtual size_t GetBytes(unsigned char *buf, size_t len) = 0; 29234285Sdim 30234285Sdim virtual ~DataStreamer(); 31234285Sdim}; 32234285Sdim 33234285SdimDataStreamer *getDataFileStreamer(const std::string &Filename, 34234285Sdim std::string *Err); 35234285Sdim 36234285Sdim} 37234285Sdim 38234285Sdim#endif // LLVM_SUPPORT_DATASTREAM_H_ 39