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

   1 #include "php_http.h"
   2
   3 #include <ext/standard/crc32.h>
   4 #include <ext/standard/sha1.h>
   5 #include <ext/standard/md5.h>
   6
   7 PHP_HTTP_API void *php_http_etag_init(TSRMLS_D)
   8 {
   9         void *ctx = NULL;
  10         char *mode = PHP_HTTP_G->env.etag_mode;
  11
  12 #ifdef PHP_HTTP_HAVE_HASH
  13         const php_hash_ops *eho = NULL;
  14
  15         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  16                 ctx = emalloc(eho->context_size);
  17                 eho->hash_init(ctx);
  18         } else
  19 #endif
  20         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  21                 ctx = emalloc(sizeof(uint));
  22                 *((uint *) ctx) = ~0;
  23         } else if (mode && !strcasecmp(mode, "sha1")) {
  24                 PHP_SHA1Init(ctx = emalloc(sizeof(PHP_SHA1_CTX)));
  25         } else {
  26                 PHP_MD5Init(ctx = emalloc(sizeof(PHP_MD5_CTX)));
  27         }
  28
  29         return ctx;
  30 }
  31
  32 PHP_HTTP_API char *php_http_etag_finish(void *ctx TSRMLS_DC)
  33 {
  34         unsigned char digest[128] = {0};
  35         char *etag = NULL, *mode = PHP_HTTP_G->env.etag_mode;
  36
  37 #ifdef PHP_HTTP_HAVE_HASH
  38         const php_hash_ops *eho = NULL;
  39
  40         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  41                 eho->hash_final(digest, ctx);
  42                 etag = php_http_etag_digest(digest, eho->digest_size);
  43         } else
  44 #endif
  45         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  46                 *((uint *) ctx) = ~*((uint *) ctx);
  47                 etag = php_http_etag_digest((const unsigned char *) ctx, sizeof(uint));
  48         } else if (mode && (!strcasecmp(mode, "sha1"))) {
  49                 PHP_SHA1Final(digest, ctx);
  50                 etag = php_http_etag_digest(digest, 20);
  51         } else {
  52                 PHP_MD5Final(digest, ctx);
  53                 etag = php_http_etag_digest(digest, 16);
  54         }
  55         efree(ctx);
  56
  57         return etag;
  58 }
  59
  60 PHP_HTTP_API size_t php_http_etag_update(void *ctx, const char *data_ptr, size_t data_len TSRMLS_DC)
  61 {
  62         char *mode = PHP_HTTP_G->env.etag_mode;
  63 #ifdef PHP_HTTP_HAVE_HASH
  64         const php_hash_ops *eho = NULL;
  65
  66         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  67                 eho->hash_update(ctx, (const unsigned char *) data_ptr, data_len);
  68         } else
  69 #endif
  70         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  71                 uint i, c = *((uint *) ctx);
  72                 for (i = 0; i < data_len; ++i) {
  73                         CRC32(c, data_ptr[i]);
  74                 }
  75                 *((uint *)ctx) = c;
  76         } else if (mode && (!strcasecmp(mode, "sha1"))) {
  77                 PHP_SHA1Update(ctx, (const unsigned char *) data_ptr, data_len);
  78         } else {
  79                 PHP_MD5Update(ctx, (const unsigned char *) data_ptr, data_len);
  80         }
  81
  82         return data_len;
  83 }
  84