source: nanovis/branches/1.1/ReadBuffer.h @ 4923

Last change on this file since 4923 was 4882, checked in by ldelgass, 5 years ago

set eol-style on new files

  • Property svn:eol-style set to native
File size: 1.7 KB
Line 
1/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2/*
3 * Copyright (C) 2004-2012  HUBzero Foundation, LLC
4 *
5 * Author: George A. Howlett <gah@purdue.edu>
6 */
7
8#include <cstdlib>
9
10#include <RpBuffer.h>
11
12#ifndef NV_READBUFFER_H
13#define NV_READBUFFER_H
14
15namespace nv {
16
17/**
18 * \brief Buffered input for reading socket
19 */
20class ReadBuffer
21{
22public:
23    enum BufferStatus {
24        ENDFILE=-1,
25        OK,
26        ERROR,
27        CONTINUE,
28    };
29
30    ReadBuffer(int fd, size_t bufferSize);
31
32    virtual ~ReadBuffer();
33
34    BufferStatus getLine(size_t *numBytesPtr, unsigned char **bytesPtr);
35
36    BufferStatus followingData(unsigned char *out, size_t numBytes);
37
38    /**
39     * \brief Check if buffer contains data ending in a newline
40     *
41     * \return bool indicating if getLine can be called without blocking
42     */
43    bool isLineAvailable()
44    {
45        return (nextNewLine() > 0);
46    }
47
48    /**
49     * \brief Get the file descriptor this object reads from
50     */
51    int file()
52    {
53        return _fd;
54    }
55
56    /**
57     * \brief Get the status of the last read
58     */
59    BufferStatus status()
60    {
61        return _lastStatus;
62    }
63
64private:
65    unsigned char *_bytes;              /**< New-ed buffer to hold read
66                                         * characters. */
67    size_t _bufferSize;                 /**< # of bytes allocated for buffer */
68    size_t _fill;                       /**< # of bytes used in the buffer */
69    size_t _mark;                       /**< Starting point of the unconsumed
70                                         * data in the buffer. */
71    int _fd;                            /**< File descriptor to get data. */
72    BufferStatus _lastStatus;           /**< Status of last read operation. */
73
74    BufferStatus doFill();
75
76    void flush()
77    {
78        _fill = _mark = 0;
79    }
80
81    size_t nextNewLine();
82};
83
84}
85
86#endif
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