Mercurial > dovecot > core-2.2

annotate src/lib/istream-limit.c @ 2983:c20a64efd608 HEAD

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Added assert.
author Timo Sirainen <tss@iki.fi>
date Thu, 16 Dec 2004 03:37:20 +0200
parents 881e265febfa
children 904a268921af
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 ssize_t _read(struct _istream *stream)
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35 {
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36 struct limit_istream *lstream = (struct limit_istream *) stream;
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37 uoff_t left;
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38 ssize_t ret;
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39 size_t pos;
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40
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41 if (stream->istream.v_offset +
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42 (stream->pos - stream->skip) >= lstream->v_size) {
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43 stream->istream.eof = TRUE;
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44 return -1;
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45 }
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46
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47 if (lstream->input->v_offset !=
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48 lstream->v_start_offset + stream->istream.v_offset) {
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49 i_stream_seek(lstream->input,
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50 lstream->v_start_offset +
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51 stream->istream.v_offset);
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52 }
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53
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54 stream->buffer = i_stream_get_data(lstream->input, &pos);
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55 if (pos <= stream->pos) {
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56 if ((ret = i_stream_read(lstream->input)) == -2) {
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57 if (stream->skip == 0)
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58 return -2;
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59 }
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60 stream->istream.eof = lstream->input->eof;
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61 stream->buffer = i_stream_get_data(lstream->input, &pos);
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62 } else {
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63 ret = 0;
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64 }
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65
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66 stream->pos -= stream->skip;
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67 stream->skip = 0;
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68
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69 if (lstream->v_size != (uoff_t)-1) {
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70 left = lstream->v_size - stream->istream.v_offset;
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71 if (pos > left)
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72 pos = left;
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73 }
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75 ret = pos > stream->pos ? (ssize_t)(pos - stream->pos) :
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76 (ret == 0 ? 0 : -1);
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77 stream->pos = pos;
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78 return ret;
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79 }
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80
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81 static void _seek(struct _istream *stream, uoff_t v_offset)
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82 {
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83 struct limit_istream *lstream = (struct limit_istream *) stream;
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84
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85 i_assert(v_offset <= lstream->v_size);
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86
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87 stream->istream.stream_errno = 0;
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88 stream->istream.v_offset = v_offset;
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89 stream->skip = stream->pos = 0;
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90 }
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91
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92 static uoff_t _get_size(struct _istream *stream)
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93 {
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94 struct limit_istream *lstream = (struct limit_istream *) stream;
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95
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96 return lstream->v_size != (uoff_t)-1 ? lstream->v_size :
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97 i_stream_get_size(lstream->input);
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98 }
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99
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100 struct istream *i_stream_create_limit(pool_t pool, struct istream *input,
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101 uoff_t v_start_offset, uoff_t v_size)
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102 {
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103 struct limit_istream *lstream;
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104
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105 i_stream_ref(input);
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106
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107 lstream = p_new(pool, struct limit_istream, 1);
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108 lstream->input = input;
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109 lstream->v_start_offset = v_start_offset;
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110 lstream->v_size = v_size;
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111
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112 lstream->istream.istream.v_offset =
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113 input->v_offset < v_start_offset ? 0 :
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114 input->v_offset - v_start_offset > v_size ? v_size :
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115 input->v_offset - v_start_offset;
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116
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117 lstream->istream.iostream.close = _close;
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118 lstream->istream.iostream.destroy = _destroy;
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119 lstream->istream.iostream.set_max_buffer_size = _set_max_buffer_size;
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120
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121 lstream->istream.read = _read;
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122 lstream->istream.seek = _seek;
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123 lstream->istream.get_size = _get_size;
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124
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125 return _i_stream_create(&lstream->istream, pool, i_stream_get_fd(input),
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126 input->real_stream->abs_start_offset +
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127 v_start_offset);
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128 }