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annotate src/http/ngx_http_cache.c @ 171:aff0e5d32af8

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nginx-0.0.1-2003-11-03-20:33:31 import
author Igor Sysoev <igor@sysoev.ru>
date Mon, 03 Nov 2003 17:33:31 +0000
parents c42be4185301
children caa57ddf6d77
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
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1
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2 #include <ngx_config.h>
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3 #include <ngx_core.h>
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4 #include <ngx_http.h>
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5
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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6 #include <md5.h>
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7
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c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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9 int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx)
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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10 {
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aff0e5d32af8 nginx-0.0.1-2003-11-03-20:33:31 import
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11 ssize_t n;
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12 MD5_CTX md5;
aff0e5d32af8 nginx-0.0.1-2003-11-03-20:33:31 import
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13 ngx_err_t err;
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14 ngx_http_cache_file_t *h;
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16 ctx->header_size = sizeof(ngx_http_cache_file_t) + ctx->key.len + 1;
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17
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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18 ctx->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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19 if (!(ctx->file.name.data = ngx_palloc(r->pool, ctx->file.name.len + 1))) {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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20 return NGX_ERROR;
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21 }
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22
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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23 ngx_memcpy(ctx->file.name.data, ctx->path->name.data, ctx->path->name.len);
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24
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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25 MD5Init(&md5);
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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26 MD5Update(&md5, (u_char *) ctx->key.data, ctx->key.len);
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27 MD5End(&md5,
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28 ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
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29
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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30 ngx_log_debug(r->connection->log, "URL: %s, md5: %s" _ ctx->key.data _
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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31 ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
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32
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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33 ngx_create_hashed_filename(&ctx->file, ctx->path);
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34
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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35 ngx_log_debug(r->connection->log, "FILE: %s" _ ctx->file.name.data);
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36
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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37 /* TODO: look open files cache */
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38
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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39 ctx->file.fd = ngx_open_file(ctx->file.name.data,
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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40 NGX_FILE_RDONLY, NGX_FILE_OPEN);
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41
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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42 if (ctx->file.fd == NGX_INVALID_FILE) {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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43 err = ngx_errno;
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44
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45 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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46 return NGX_DECLINED;
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47 }
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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48
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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49 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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50 ngx_open_file_n " \"%s\" failed", ctx->file.name.data);
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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51 return NGX_ERROR;
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52 }
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53
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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54 n = ngx_read_file(&ctx->file, ctx->buf->pos,
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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55 ctx->buf->end - ctx->buf->last, 0);
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56
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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57 if (n == NGX_ERROR || n == NGX_AGAIN) {
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58 return n;
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59 }
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60
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61 if (n <= ctx->header_size) {
170
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62 ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
171
aff0e5d32af8 nginx-0.0.1-2003-11-03-20:33:31 import
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63 "cache file \"%s\" is too small", ctx->file.name.data);
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64 return NGX_ERROR;
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65 }
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66
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67 h = (ngx_http_cache_file_t *) ctx->buf->pos;
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68 ctx->header = h->header;
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69
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70 if (h->key_len != ctx->key.len
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71 || ngx_strncmp(h->key, ctx->key.data, h->key_len) != 0)
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72 {
171
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73 h->key[h->key_len] = '\0';
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74 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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75 "md5 collision: \"%s\" and \"%s\"",
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76 h->key, ctx->key.data);
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77 return NGX_DECLINED;
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78 }
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79
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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80 ctx->buf->last += n;
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81
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82 if (ctx->header.expires < ngx_time()) {
aff0e5d32af8 nginx-0.0.1-2003-11-03-20:33:31 import
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83 return NGX_STALE;
aff0e5d32af8 nginx-0.0.1-2003-11-03-20:33:31 import
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84 }
aff0e5d32af8 nginx-0.0.1-2003-11-03-20:33:31 import
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85
170
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86 return NGX_OK;
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87 }
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88
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89
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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90 int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx,
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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91 ngx_str_t *temp_file)
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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92 {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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93 int retry;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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94 ngx_err_t err;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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95
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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96 retry = 0;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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97
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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98 for ( ;; ) {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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99 if (ngx_rename_file(temp_file->data, ctx->file.name.data)
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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100 != NGX_FILE_ERROR)
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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101 {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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102 return NGX_OK;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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103 }
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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104
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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105 err = ngx_errno;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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106
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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107 if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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108 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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109 ngx_rename_file_n "(\"%s\", \"%s\") failed",
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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110 temp_file->data, ctx->file.name.data);
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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111
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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112 return NGX_ERROR;
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113 }
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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114
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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115 if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) {
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
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diff changeset
116 return NGX_ERROR;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
117 }
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
118
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
119 retry = 1;
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
120 }
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
121 }
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
122
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
123
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
124 #if 0
97
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
125
99
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
126 /*
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
127 * small file in malloc()ed memory, mmap()ed file, file descriptor only,
105
00bee6e7b485 nginx-0.0.1-2003-06-15-22:32:13 import
Igor Sysoev <igor@sysoev.ru>
parents: 99
diff changeset
128 * file access time only (to estimate could pages still be in memory),
99
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
129 * translated URI (ngx_http_index_hanlder),
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
130 * compiled script (ngx_http_ssi_filter).
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
131 */
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
132
97
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
133
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
134 #define NGX_HTTP_CACHE_ENTRY_DELETED 0x00000001
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
135 #define NGX_HTTP_CACHE_ENTRY_MMAPED 0x00000002
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
136
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
137 /* "/" -> "/index.html" in ngx_http_index_handler */
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
138 #define NGX_HTTP_CACHE_ENTRY_URI 0x00000004
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
139
105
00bee6e7b485 nginx-0.0.1-2003-06-15-22:32:13 import
Igor Sysoev <igor@sysoev.ru>
parents: 99
diff changeset
140 /* 301 location "/dir" -> "dir/" in ngx_http_core_handler */
00bee6e7b485 nginx-0.0.1-2003-06-15-22:32:13 import
Igor Sysoev <igor@sysoev.ru>
parents: 99
diff changeset
141
00bee6e7b485 nginx-0.0.1-2003-06-15-22:32:13 import
Igor Sysoev <igor@sysoev.ru>
parents: 99
diff changeset
142 /* compiled script in ngx_http_ssi_filter */
99
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
143 #define NGX_HTTP_CACHE_ENTRY_SCRIPT 0x00000008
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
144
97
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
145 #define NGX_HTTP_CACHE_FILTER_FLAGS 0xFFFF0000
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
146
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
147
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
148 typedef struct {
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
149 ngx_fd_t fd;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
150 off_t size;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
151 void *data;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
152 time_t accessed;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
153 time_t last_modified;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
154 time_t updated; /* no needed with kqueue */
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
155 int refs;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
156 int flags;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
157 } ngx_http_cache_entry_t;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
158
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
159
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
160 typedef struct {
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
161 u_int32_t crc;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
162 ngx_str_t uri;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
163 ngx_http_cache_t *cache;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
164 } ngx_http_cache_hash_entry_t;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
165
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
166
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
167 typedef struct {
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
168 ngx_http_cache_t *cache;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
169 u_int32_t crc;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
170 int n;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
171 } ngx_http_cache_handle_t;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
172
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
173
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
174 int ngx_http_cache_get(ngx_http_cache_hash_t *cache_hash,
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
175 ngx_str_t *uri, ngx_http_cache_handle_t *h)
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
176 {
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
177 int hi;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
178 ngx_http_cache_hash_entry_t *entry;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
179
99
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
180 h->crc = ngx_crc(uri->data, uri->len);
97
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
181
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
182 hi = h->crc % cache_hash->size;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
183 entry = cache_hash[hi].elts;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
184
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
185 for (i = 0; i < cache_hash[hi].nelts; i++) {
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
186 if (entry[i].crc == crc
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
187 && entry[i].uri.len == uri->len
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
188 && ngx_strncmp(entry[i].uri.data, uri->data, uri->len) == 0
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
189 {
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
190 h->cache = entry[i].cache;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
191 h->cache->refs++;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
192 h->n = hi;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
193 return NGX_OK;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
194 }
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
195 }
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
196
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
197 return NGX_ERROR;
70d2345a903f nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
198 }
99
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
199
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
200
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
201 /* 32-bit crc16 */
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
202
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
203 int ngx_crc(char *data, size_t len)
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
204 {
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
205 u_int32_t sum;
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
206
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
207 for (sum = 0; len; len--) {
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
208 /*
107
b5be4b0448d3 nginx-0.0.1-2003-07-01-19:00:03 import
Igor Sysoev <igor@sysoev.ru>
parents: 105
diff changeset
209 * gcc 2.95.2 x86 and icc 7.1.006 compile that operator
b5be4b0448d3 nginx-0.0.1-2003-07-01-19:00:03 import
Igor Sysoev <igor@sysoev.ru>
parents: 105
diff changeset
210 * into the single rol opcode.
99
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
211 * msvc 6.0sp2 compiles it into four opcodes.
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
212 */
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
213 sum = sum >> 1 | sum << 31;
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
214
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
215 sum += *data++;
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
216 }
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
217
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
218 return sum;
a059e1aa65d4 nginx-0.0.1-2003-06-02-19:24:30 import
Igor Sysoev <igor@sysoev.ru>
parents: 97
diff changeset
219 }
170
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
220
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 107
diff changeset
221 #endif