Mercurial > dovecot > core-2.2

annotate src/lib-fs/ostream-cmp.c @ 12782:447bce266022

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Updated copyright notices to include year 2011.
author Timo Sirainen <tss@iki.fi>
date Fri, 04 Mar 2011 20:54:29 +0200
parents e3fe87b855ef
children cf77e448295c
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12782
447bce266022 Updated copyright notices to include year 2011.
Timo Sirainen <tss@iki.fi>
parents: 12309
diff changeset
1 /* Copyright (c) 2010-2011 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.h"
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5 #include "ostream-internal.h"
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6 #include "ostream-cmp.h"
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7
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8 struct cmp_ostream {
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9 struct ostream_private ostream;
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10
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11 struct istream *input;
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12 struct ostream *output;
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13 bool equals;
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14 };
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15
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16 static void cstream_copy_error(struct cmp_ostream *cstream)
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17 {
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18 struct ostream *src = cstream->output;
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19 struct ostream *dest = &cstream->ostream.ostream;
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20
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21 dest->stream_errno = src->stream_errno;
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22 dest->last_failed_errno = src->last_failed_errno;
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23 dest->overflow = src->overflow;
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24 }
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25
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26 static void o_stream_cmp_close(struct iostream_private *stream)
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27 {
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28 struct cmp_ostream *cstream = (struct cmp_ostream *)stream;
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29
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30 if (cstream->output == NULL)
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31 return;
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32
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33 i_stream_unref(&cstream->input);
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34 o_stream_flush(&cstream->ostream.ostream);
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35 o_stream_unref(&cstream->output);
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36 }
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37
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38 static int o_stream_cmp_flush(struct ostream_private *stream)
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39 {
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40 struct cmp_ostream *cstream = (struct cmp_ostream *)stream;
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41 int ret;
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42
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43 ret = o_stream_flush(cstream->output);
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44 if (ret < 0)
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45 cstream_copy_error(cstream);
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46 return ret;
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47 }
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48
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49 bool stream_cmp_block(struct istream *input,
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50 const unsigned char *data, size_t size)
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51 {
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52 const unsigned char *indata;
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53 size_t insize, max;
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54
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55 while (size > 0) {
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56 (void)i_stream_read_data(input, &indata, &insize, size-1);
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57 max = I_MIN(insize, size);
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58 if (insize == 0 || memcmp(data, indata, max) != 0)
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59 return FALSE;
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60 data += max;
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61 size -= max;
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62 i_stream_skip(input, max);
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63 }
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64 return TRUE;
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65 }
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66
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67 static ssize_t
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68 o_stream_cmp_sendv(struct ostream_private *stream,
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69 const struct const_iovec *iov, unsigned int iov_count)
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70 {
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71 struct cmp_ostream *cstream = (struct cmp_ostream *)stream;
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72 unsigned int i;
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73 ssize_t ret;
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74
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75 if (cstream->equals) {
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76 for (i = 0; i < iov_count; i++) {
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77 if (!stream_cmp_block(cstream->input, iov[i].iov_base,
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78 iov[i].iov_len)) {
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79 cstream->equals = FALSE;
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80 break;
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81 }
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82 }
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83 }
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84
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85 if ((ret = o_stream_sendv(cstream->output, iov, iov_count)) < 0) {
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86 cstream_copy_error(cstream);
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87 return -1;
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88 }
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89
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90 stream->ostream.offset += ret;
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91 return ret;
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92 }
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93
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94 struct ostream *
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95 o_stream_create_cmp(struct ostream *output, struct istream *input)
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96 {
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97 struct cmp_ostream *cstream;
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98
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99 cstream = i_new(struct cmp_ostream, 1);
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100 cstream->ostream.sendv = o_stream_cmp_sendv;
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101 cstream->ostream.flush = o_stream_cmp_flush;
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102 cstream->ostream.iostream.close = o_stream_cmp_close;
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103 cstream->input = input;
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104 cstream->output = output;
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105 cstream->equals = TRUE;
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106 i_stream_ref(input);
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107 o_stream_ref(output);
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108
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109 return o_stream_create(&cstream->ostream);
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110 }
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111
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112 bool o_stream_cmp_equals(struct ostream *_output)
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113 {
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114 struct cmp_ostream *cstream =
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115 (struct cmp_ostream *)_output->real_stream;
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116
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117 return cstream->equals;
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118 }