Mercurial > dovecot > core-2.2

annotate src/lib/istream-limit.c @ 2166:ed6b3d59ce93 HEAD

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minor fix
author Timo Sirainen <tss@iki.fi>
date Sat, 19 Jun 2004 04:00:09 +0300
parents a0b23396835c
children 545c1d3ead54
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Copyright (C) 2003 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "istream-internal.h"
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5
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6 struct limit_istream {
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7 struct _istream istream;
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8
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9 struct istream *input;
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10 uoff_t v_start_offset, v_size;
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11 };
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12
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13 static void _close(struct _iostream *stream __attr_unused__)
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14 {
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15 }
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16
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17 static void _destroy(struct _iostream *stream)
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18 {
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19 struct limit_istream *lstream = (struct limit_istream *) stream;
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20
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21 /* get to same position in parent stream */
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22 i_stream_seek(lstream->input, lstream->v_start_offset +
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23 lstream->istream.istream.v_offset);
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24 i_stream_unref(lstream->input);
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25 }
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26
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27 static void _set_max_buffer_size(struct _iostream *stream, size_t max_size)
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28 {
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29 struct limit_istream *lstream = (struct limit_istream *) stream;
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30
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31 i_stream_set_max_buffer_size(lstream->input, max_size);
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32 }
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33
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34 static void _set_blocking(struct _iostream *stream, int timeout_msecs,
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35 void (*timeout_cb)(void *), void *context)
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36 {
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37 struct limit_istream *lstream = (struct limit_istream *) stream;
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38
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39 i_stream_set_blocking(lstream->input, timeout_msecs,
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40 timeout_cb, context);
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41 }
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42
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43 static ssize_t _read(struct _istream *stream)
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44 {
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45 struct limit_istream *lstream = (struct limit_istream *) stream;
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46 uoff_t left;
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47 ssize_t ret;
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48 size_t pos;
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49
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50 if (stream->istream.v_offset +
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51 (stream->pos - stream->skip) >= lstream->v_size)
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52 return -1;
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53
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54 if (lstream->input->v_offset !=
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55 lstream->v_start_offset + stream->istream.v_offset) {
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56 i_stream_seek(lstream->input,
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57 lstream->v_start_offset +
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58 stream->istream.v_offset);
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59 }
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60
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61 if (i_stream_read(lstream->input) == -2 && stream->buffer != NULL) {
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62 if (stream->skip == 0)
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63 return -2;
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64 }
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65 stream->istream.disconnected = lstream->input->disconnected;
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66
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67 stream->pos -= stream->skip;
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68 stream->skip = 0;
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69 stream->buffer = i_stream_get_data(lstream->input, &pos);
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70
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71 if (lstream->v_size != (uoff_t)-1) {
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72 left = lstream->v_size - stream->istream.v_offset;
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73 if (pos > left)
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74 pos = left;
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75 }
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76
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77 ret = pos <= stream->pos ? -1 :
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78 (ssize_t) (pos - stream->pos);
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79 stream->pos = pos;
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80 return ret;
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81 }
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82
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83 static void _seek(struct _istream *stream, uoff_t v_offset)
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84 {
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85 stream->istream.stream_errno = 0;
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86 stream->istream.v_offset = v_offset;
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87 stream->skip = stream->pos = 0;
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88 }
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89
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90 static uoff_t _get_size(struct _istream *stream)
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91 {
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92 struct limit_istream *lstream = (struct limit_istream *) stream;
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93
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94 return lstream->v_size != (uoff_t)-1 ? lstream->v_size :
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95 i_stream_get_size(lstream->input);
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96 }
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97
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98 struct istream *i_stream_create_limit(pool_t pool, struct istream *input,
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99 uoff_t v_start_offset, uoff_t v_size)
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100 {
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101 struct limit_istream *lstream;
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102
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103 i_stream_ref(input);
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104
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105 lstream = p_new(pool, struct limit_istream, 1);
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106 lstream->input = input;
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107 lstream->v_start_offset = v_start_offset;
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108 lstream->v_size = v_size;
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109
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110 lstream->istream.istream.v_offset =
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111 input->v_offset < v_start_offset ? 0 :
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112 input->v_offset - v_start_offset > v_size ? v_size :
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113 input->v_offset - v_start_offset;
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114
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115 lstream->istream.iostream.close = _close;
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116 lstream->istream.iostream.destroy = _destroy;
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117 lstream->istream.iostream.set_max_buffer_size = _set_max_buffer_size;
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118 lstream->istream.iostream.set_blocking = _set_blocking;
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119
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120 lstream->istream.read = _read;
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121 lstream->istream.seek = _seek;
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122 lstream->istream.get_size = _get_size;
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123
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124 return _i_stream_create(&lstream->istream, pool, i_stream_get_fd(input),
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125 input->real_stream->abs_start_offset +
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126 v_start_offset);
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127 }