Mercurial > dovecot > core-2.2

annotate src/lib-compression/compression.c @ 22325:e01bc3015b2f

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lib-index: Check .log.2 rotation only when syncing Instead of also whenever appending transactions to .log file. This shouldn't change the behavior much, and it's needed for the following change to work correctly.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Tue, 11 Jul 2017 15:33:56 +0300
parents 2e2563132d5f
children cb108f786fb4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
21390
2e2563132d5f Updated copyright notices to include the year 2017.
Stephan Bosch <stephan.bosch@dovecot.fi>
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1 /* Copyright (c) 2010-2017 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 "istream-zlib.h"
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6 #include "ostream-zlib.h"
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7 #include "iostream-lz4.h"
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8 #include "compression.h"
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9
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10 #ifndef HAVE_ZLIB
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11 # define i_stream_create_gz NULL
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12 # define o_stream_create_gz NULL
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13 # define i_stream_create_deflate NULL
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14 # define o_stream_create_deflate NULL
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15 #endif
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16 #ifndef HAVE_BZLIB
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17 # define i_stream_create_bz2 NULL
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18 # define o_stream_create_bz2 NULL
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19 #endif
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20 #ifndef HAVE_LZMA
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21 # define i_stream_create_lzma NULL
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22 # define o_stream_create_lzma NULL
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23 #endif
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24 #ifndef HAVE_LZ4
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25 # define i_stream_create_lz4 NULL
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26 # define o_stream_create_lz4 NULL
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27 #endif
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28
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29 static bool is_compressed_zlib(struct istream *input)
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30 {
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31 const unsigned char *data;
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32 size_t size;
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33
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34 /* Peek in to the stream and see if it looks like it's compressed
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35 (based on its header). This also means that users can try to exploit
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36 security holes in the uncompression library by APPENDing a specially
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37 crafted mail. So let's hope zlib is free of holes. */
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38 if (i_stream_read_data(input, &data, &size, 1) <= 0)
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39 return FALSE;
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40 i_assert(size >= 2);
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41
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42 return data[0] == 31 && data[1] == 139;
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43 }
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44
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45 static bool is_compressed_bzlib(struct istream *input)
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46 {
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47 const unsigned char *data;
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48 size_t size;
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49
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50 if (i_stream_read_data(input, &data, &size, 4+6 - 1) <= 0)
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51 return FALSE;
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52 if (data[0] != 'B' || data[1] != 'Z')
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53 return FALSE;
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54 if (data[2] != 'h' && data[2] != '0')
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55 return FALSE;
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56 if (data[3] < '1' || data[3] > '9')
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57 return FALSE;
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58 return memcmp(data + 4, "\x31\x41\x59\x26\x53\x59", 6) == 0;
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59 }
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60
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61 static bool is_compressed_xz(struct istream *input)
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62 {
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63 const unsigned char *data;
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64 size_t size;
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65
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66 if (i_stream_read_data(input, &data, &size, 6 - 1) <= 0)
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67 return FALSE;
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68 return memcmp(data, "\xfd\x37\x7a\x58\x5a", 6) == 0;
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69 }
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70
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71 static bool is_compressed_lz4(struct istream *input)
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72 {
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73 const unsigned char *data;
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74 size_t size;
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75
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76 if (i_stream_read_data(input, &data, &size,
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77 IOSTREAM_LZ4_MAGIC_LEN - 1) <= 0)
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78 return FALSE;
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79 /* there is no standard LZ4 header, so we've created our own */
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80 return memcmp(data, IOSTREAM_LZ4_MAGIC, IOSTREAM_LZ4_MAGIC_LEN) == 0;
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81 }
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82
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83 const struct compression_handler *compression_lookup_handler(const char *name)
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84 {
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85 unsigned int i;
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86
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87 for (i = 0; compression_handlers[i].name != NULL; i++) {
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88 if (strcmp(name, compression_handlers[i].name) == 0)
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89 return &compression_handlers[i];
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90 }
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91 return NULL;
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92 }
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93
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94 const struct compression_handler *
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95 compression_detect_handler(struct istream *input)
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96 {
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97 unsigned int i;
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98
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99 for (i = 0; compression_handlers[i].name != NULL; i++) {
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100 if (compression_handlers[i].is_compressed != NULL &&
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101 compression_handlers[i].is_compressed(input))
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102 return &compression_handlers[i];
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103 }
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104 return NULL;
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105 }
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106
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107 const struct compression_handler *
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108 compression_lookup_handler_from_ext(const char *path)
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109 {
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110 unsigned int i;
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111 size_t len, path_len = strlen(path);
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112
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113 for (i = 0; compression_handlers[i].name != NULL; i++) {
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114 if (compression_handlers[i].ext == NULL)
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115 continue;
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116
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117 len = strlen(compression_handlers[i].ext);
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118 if (path_len > len &&
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119 strcmp(path + path_len - len, compression_handlers[i].ext) == 0)
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120 return &compression_handlers[i];
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121 }
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122 return NULL;
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123 }
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124
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125 const struct compression_handler compression_handlers[] = {
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126 { "gz", ".gz", is_compressed_zlib,
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127 i_stream_create_gz, o_stream_create_gz },
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128 { "bz2", ".bz2", is_compressed_bzlib,
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129 i_stream_create_bz2, o_stream_create_bz2 },
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130 { "deflate", NULL, NULL,
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131 i_stream_create_deflate, o_stream_create_deflate },
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132 { "xz", ".xz", is_compressed_xz,
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133 i_stream_create_lzma, o_stream_create_lzma },
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134 { "lz4", ".lz4", is_compressed_lz4,
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parents: 17028
diff changeset
135 i_stream_create_lz4, o_stream_create_lz4 },
14739
378ba560ea9f Moved zlib/bzlib code to lib-compression library.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
136 { NULL, NULL, NULL, NULL, NULL }
378ba560ea9f Moved zlib/bzlib code to lib-compression library.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
137 };