git.m6w6.name Git - m6w6/ext-http/blob - php_http_etag.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | PECL :: http                                                       |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted provided that the conditions mentioned |
   7     | in the accompanying LICENSE file are met.                          |
   8     +--------------------------------------------------------------------+
   9     | Copyright (c) 2004-2014, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 #include "php_http_api.h"
  14
  15 #ifdef PHP_HTTP_HAVE_HASH
  16 #       include "php_hash.h"
  17 #endif
  18
  19 #include <ext/standard/crc32.h>
  20 #include <ext/standard/sha1.h>
  21 #include <ext/standard/md5.h>
  22
  23 php_http_etag_t *php_http_etag_init(const char *mode TSRMLS_DC)
  24 {
  25         void *ctx;
  26         php_http_etag_t *e;
  27
  28         if (mode && (!strcasecmp(mode, "crc32b"))) {
  29                 ctx = emalloc(sizeof(uint));
  30                 *((uint *) ctx) = ~0;
  31         } else if (mode && !strcasecmp(mode, "sha1")) {
  32                 PHP_SHA1Init(ctx = emalloc(sizeof(PHP_SHA1_CTX)));
  33         } else if (mode && !strcasecmp(mode, "md5")) {
  34                 PHP_MD5Init(ctx = emalloc(sizeof(PHP_MD5_CTX)));
  35         } else {
  36 #ifdef PHP_HTTP_HAVE_HASH
  37                 const php_hash_ops *eho = NULL;
  38
  39                 if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  40                         ctx = emalloc(eho->context_size);
  41                         eho->hash_init(ctx);
  42                 } else
  43 #endif
  44                 return NULL;
  45         }
  46
  47         e = emalloc(sizeof(*e));
  48         e->ctx = ctx;
  49         e->mode = estrdup(mode);
  50         TSRMLS_SET_CTX(e->ts);
  51
  52         return e;
  53 }
  54
  55 char *php_http_etag_finish(php_http_etag_t *e)
  56 {
  57         unsigned char digest[128] = {0};
  58         char *etag = NULL;
  59
  60         if (!strcasecmp(e->mode, "crc32b")) {
  61                 unsigned char buf[4];
  62
  63                 *((uint *) e->ctx) = ~*((uint *) e->ctx);
  64 #ifdef WORDS_BIGENDIAN
  65                 etag = php_http_etag_digest((unsigned char *) e->ctx, 4);
  66 #else
  67                 buf[0] = ((unsigned char *) e->ctx)[3];
  68                 buf[1] = ((unsigned char *) e->ctx)[2];
  69                 buf[2] = ((unsigned char *) e->ctx)[1];
  70                 buf[3] = ((unsigned char *) e->ctx)[0];
  71                 etag = php_http_etag_digest(buf, 4);
  72 #endif
  73         } else if ((!strcasecmp(e->mode, "sha1"))) {
  74                 PHP_SHA1Final(digest, e->ctx);
  75                 etag = php_http_etag_digest(digest, 20);
  76         } else if ((!strcasecmp(e->mode, "md5"))) {
  77                 PHP_MD5Final(digest, e->ctx);
  78                 etag = php_http_etag_digest(digest, 16);
  79         } else {
  80 #ifdef PHP_HTTP_HAVE_HASH
  81                 const php_hash_ops *eho = NULL;
  82
  83                 if (e->mode && (eho = php_hash_fetch_ops(e->mode, strlen(e->mode)))) {
  84                         eho->hash_final(digest, e->ctx);
  85                         etag = php_http_etag_digest(digest, eho->digest_size);
  86                 }
  87 #endif
  88         }
  89
  90         efree(e->ctx);
  91         efree(e->mode);
  92         efree(e);
  93
  94         return etag;
  95 }
  96
  97 size_t php_http_etag_update(php_http_etag_t *e, const char *data_ptr, size_t data_len)
  98 {
  99         if (!strcasecmp(e->mode, "crc32b")) {
 100                 uint i, c = *((uint *) e->ctx);
 101                 for (i = 0; i < data_len; ++i) {
 102                         CRC32(c, data_ptr[i]);
 103                 }
 104                 *((uint *) e->ctx) = c;
 105         } else if ((!strcasecmp(e->mode, "sha1"))) {
 106                 PHP_SHA1Update(e->ctx, (const unsigned char *) data_ptr, data_len);
 107         } else if ((!strcasecmp(e->mode, "md5"))) {
 108                 PHP_MD5Update(e->ctx, (const unsigned char *) data_ptr, data_len);
 109         } else {
 110 #ifdef PHP_HTTP_HAVE_HASH
 111                 const php_hash_ops *eho = NULL;
 112
 113                 if (e->mode && (eho = php_hash_fetch_ops(e->mode, strlen(e->mode)))) {
 114                         eho->hash_update(e->ctx, (const unsigned char *) data_ptr, data_len);
 115                 }
 116 #endif
 117         }
 118
 119         return data_len;
 120 }
 121
 122
 123 /*
 124  * Local variables:
 125  * tab-width: 4
 126  * c-basic-offset: 4
 127  * End:
 128  * vim600: noet sw=4 ts=4 fdm=marker
 129  * vim<600: noet sw=4 ts=4
 130  */
 131