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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_