Mercurial > dovecot > core-2.2
annotate src/lib/istream-limit.c @ 12782:447bce266022
Updated copyright notices to include year 2011.
author | Timo Sirainen <tss@iki.fi> |
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date | Fri, 04 Mar 2011 20:54:29 +0200 |
parents | 7705bd04924c |
children | cf77e448295c |
rev | line source |
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12782
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Updated copyright notices to include year 2011.
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1 /* Copyright (c) 2003-2011 Dovecot authors, see the included COPYING file */ |
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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_private istream; |
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8 |
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9 uoff_t v_size; |
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10 }; |
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11 |
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12 static void i_stream_limit_destroy(struct iostream_private *stream) |
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13 { |
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14 struct limit_istream *lstream = (struct limit_istream *) stream; |
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15 uoff_t v_offset; |
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16 |
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17 v_offset = lstream->istream.parent_start_offset + |
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18 lstream->istream.istream.v_offset; |
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19 if (lstream->istream.parent->seekable || |
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20 v_offset > lstream->istream.parent->v_offset) { |
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21 /* get to same position in parent stream */ |
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22 i_stream_seek(lstream->istream.parent, v_offset); |
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23 } |
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24 i_stream_unref(&lstream->istream.parent); |
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25 } |
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26 |
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27 static ssize_t i_stream_limit_read(struct istream_private *stream) |
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28 { |
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29 struct limit_istream *lstream = (struct limit_istream *) stream; |
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30 uoff_t left; |
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31 ssize_t ret; |
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32 size_t pos; |
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33 |
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34 if (stream->istream.v_offset + |
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35 (stream->pos - stream->skip) >= lstream->v_size) { |
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36 stream->istream.eof = TRUE; |
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37 return -1; |
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38 } |
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39 |
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40 i_stream_seek(stream->parent, lstream->istream.parent_start_offset + |
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41 stream->istream.v_offset); |
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42 |
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43 stream->pos -= stream->skip; |
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44 stream->skip = 0; |
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45 |
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46 stream->buffer = i_stream_get_data(stream->parent, &pos); |
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47 if (pos > stream->pos) |
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48 ret = 0; |
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49 else do { |
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50 if ((ret = i_stream_read(stream->parent)) == -2) |
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51 return -2; |
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52 |
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53 stream->istream.stream_errno = stream->parent->stream_errno; |
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54 stream->istream.eof = stream->parent->eof; |
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55 stream->buffer = i_stream_get_data(stream->parent, &pos); |
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56 } while (pos <= stream->pos && ret > 0); |
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57 |
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58 if (lstream->v_size != (uoff_t)-1) { |
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59 left = lstream->v_size - stream->istream.v_offset; |
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60 if (pos >= left) { |
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61 pos = left; |
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62 stream->istream.eof = TRUE; |
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63 } |
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65 |
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66 ret = pos > stream->pos ? (ssize_t)(pos - stream->pos) : |
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67 (ret == 0 ? 0 : -1); |
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68 stream->pos = pos; |
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69 i_assert(ret != -1 || stream->istream.eof || |
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70 stream->istream.stream_errno != 0); |
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71 return ret; |
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72 } |
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73 |
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74 static void i_stream_limit_seek(struct istream_private *stream, uoff_t v_offset, |
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75 bool mark ATTR_UNUSED) |
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76 { |
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77 stream->istream.v_offset = v_offset; |
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78 stream->skip = stream->pos = 0; |
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79 } |
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80 |
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81 static const struct stat * |
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82 i_stream_limit_stat(struct istream_private *stream, bool exact) |
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83 { |
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84 struct limit_istream *lstream = (struct limit_istream *) stream; |
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85 const struct stat *st; |
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86 |
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87 st = i_stream_stat(stream->parent, exact); |
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88 if (st == NULL) |
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89 return NULL; |
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90 |
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91 stream->statbuf = *st; |
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92 if (lstream->v_size != (uoff_t)-1) |
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93 stream->statbuf.st_size = lstream->v_size; |
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94 return &stream->statbuf; |
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95 } |
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96 |
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97 static int i_stream_limit_get_size(struct istream_private *stream, |
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98 bool exact, uoff_t *size_r) |
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99 { |
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100 struct limit_istream *lstream = (struct limit_istream *) stream; |
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101 const struct stat *st; |
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102 |
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103 if (lstream->v_size != (uoff_t)-1) { |
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104 *size_r = lstream->v_size; |
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105 return 1; |
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106 } |
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107 |
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108 st = i_stream_stat(&stream->istream, exact); |
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109 if (st == NULL) |
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110 return -1; |
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111 if (st->st_size == -1) |
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112 return 0; |
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113 |
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114 *size_r = st->st_size; |
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115 return 1; |
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116 } |
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117 |
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118 struct istream *i_stream_create_limit(struct istream *input, uoff_t v_size) |
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119 { |
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120 struct limit_istream *lstream; |
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121 |
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122 lstream = i_new(struct limit_istream, 1); |
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123 lstream->v_size = v_size; |
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124 lstream->istream.max_buffer_size = input->real_stream->max_buffer_size; |
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125 |
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126 lstream->istream.iostream.destroy = i_stream_limit_destroy; |
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127 lstream->istream.parent = input; |
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128 lstream->istream.read = i_stream_limit_read; |
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129 lstream->istream.seek = i_stream_limit_seek; |
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130 lstream->istream.stat = i_stream_limit_stat; |
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131 lstream->istream.get_size = i_stream_limit_get_size; |
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132 |
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133 lstream->istream.istream.readable_fd = input->readable_fd; |
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134 lstream->istream.istream.blocking = input->blocking; |
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135 lstream->istream.istream.seekable = input->seekable; |
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136 return i_stream_create(&lstream->istream, input, |
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137 i_stream_get_fd(input)); |
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138 } |