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) 2004-2011, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 #include "php_http.h"
  14
  15 #if 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_API 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 PHP_HTTP_HAVE_HASH
  29         const php_hash_ops *eho = NULL;
  30
  31         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  32                 ctx = emalloc(eho->context_size);
  33                 eho->hash_init(ctx);
  34         } else
  35 #endif
  36         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  37                 ctx = emalloc(sizeof(uint));
  38                 *((uint *) ctx) = ~0;
  39         } else if (mode && !strcasecmp(mode, "sha1")) {
  40                 PHP_SHA1Init(ctx = emalloc(sizeof(PHP_SHA1_CTX)));
  41         } else if (mode && !strcasecmp(mode, "md5")) {
  42                 PHP_MD5Init(ctx = emalloc(sizeof(PHP_MD5_CTX)));
  43         } else {
  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 PHP_HTTP_API char *php_http_etag_finish(php_http_etag_t *e)
  56 {
  57         unsigned char digest[128] = {0};
  58         char *etag = NULL;
  59
  60 #if PHP_HTTP_HAVE_HASH
  61         const php_hash_ops *eho = NULL;
  62
  63         if (e->mode && (eho = php_hash_fetch_ops(e->mode, strlen(e->mode)))) {
  64                 eho->hash_final(digest, e->ctx);
  65                 etag = php_http_etag_digest(digest, eho->digest_size);
  66         } else
  67 #endif
  68         if (((!strcasecmp(e->mode, "crc32")) || (!strcasecmp(e->mode, "crc32b")))) {
  69                 *((uint *) e->ctx) = ~*((uint *) e->ctx);
  70                 etag = php_http_etag_digest((const unsigned char *) e->ctx, sizeof(uint));
  71         } else if ((!strcasecmp(e->mode, "sha1"))) {
  72                 PHP_SHA1Final(digest, e->ctx);
  73                 etag = php_http_etag_digest(digest, 20);
  74         } else {
  75                 PHP_MD5Final(digest, e->ctx);
  76                 etag = php_http_etag_digest(digest, 16);
  77         }
  78         efree(e->ctx);
  79         efree(e->mode);
  80         efree(e);
  81
  82         return etag;
  83 }
  84
  85 PHP_HTTP_API size_t php_http_etag_update(php_http_etag_t *e, const char *data_ptr, size_t data_len)
  86 {
  87 #if PHP_HTTP_HAVE_HASH
  88         const php_hash_ops *eho = NULL;
  89
  90         if (e->mode && (eho = php_hash_fetch_ops(e->mode, strlen(e->mode)))) {
  91                 eho->hash_update(e->ctx, (const unsigned char *) data_ptr, data_len);
  92         } else
  93 #endif
  94         if (((!strcasecmp(e->mode, "crc32")) || (!strcasecmp(e->mode, "crc32b")))) {
  95                 uint i, c = *((uint *) e->ctx);
  96                 for (i = 0; i < data_len; ++i) {
  97                         CRC32(c, data_ptr[i]);
  98                 }
  99                 *((uint *) e->ctx) = c;
 100         } else if ((!strcasecmp(e->mode, "sha1"))) {
 101                 PHP_SHA1Update(e->ctx, (const unsigned char *) data_ptr, data_len);
 102         } else {
 103                 PHP_MD5Update(e->ctx, (const unsigned char *) data_ptr, data_len);
 104         }
 105
 106         return data_len;
 107 }
 108
 109
 110 /*
 111  * Local variables:
 112  * tab-width: 4
 113  * c-basic-offset: 4
 114  * End:
 115  * vim600: noet sw=4 ts=4 fdm=marker
 116  * vim<600: noet sw=4 ts=4
 117  */
 118