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

   1 #include "php_http.h"
   2
   3 #ifdef PHP_HTTP_HAVE_HASH
   4 #       include "php_hash.h"
   5 #endif
   6
   7 #include <ext/standard/crc32.h>
   8 #include <ext/standard/sha1.h>
   9 #include <ext/standard/md5.h>
  10
  11 PHP_HTTP_API void *php_http_etag_init(TSRMLS_D)
  12 {
  13         void *ctx = NULL;
  14         char *mode = PHP_HTTP_G->env.etag_mode;
  15
  16 #ifdef PHP_HTTP_HAVE_HASH
  17         const php_hash_ops *eho = NULL;
  18
  19         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  20                 ctx = emalloc(eho->context_size);
  21                 eho->hash_init(ctx);
  22         } else
  23 #endif
  24         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  25                 ctx = emalloc(sizeof(uint));
  26                 *((uint *) ctx) = ~0;
  27         } else if (mode && !strcasecmp(mode, "sha1")) {
  28                 PHP_SHA1Init(ctx = emalloc(sizeof(PHP_SHA1_CTX)));
  29         } else {
  30                 PHP_MD5Init(ctx = emalloc(sizeof(PHP_MD5_CTX)));
  31         }
  32
  33         return ctx;
  34 }
  35
  36 PHP_HTTP_API char *php_http_etag_finish(void *ctx TSRMLS_DC)
  37 {
  38         unsigned char digest[128] = {0};
  39         char *etag = NULL, *mode = PHP_HTTP_G->env.etag_mode;
  40
  41 #ifdef PHP_HTTP_HAVE_HASH
  42         const php_hash_ops *eho = NULL;
  43
  44         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  45                 eho->hash_final(digest, ctx);
  46                 etag = php_http_etag_digest(digest, eho->digest_size);
  47         } else
  48 #endif
  49         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  50                 *((uint *) ctx) = ~*((uint *) ctx);
  51                 etag = php_http_etag_digest((const unsigned char *) ctx, sizeof(uint));
  52         } else if (mode && (!strcasecmp(mode, "sha1"))) {
  53                 PHP_SHA1Final(digest, ctx);
  54                 etag = php_http_etag_digest(digest, 20);
  55         } else {
  56                 PHP_MD5Final(digest, ctx);
  57                 etag = php_http_etag_digest(digest, 16);
  58         }
  59         efree(ctx);
  60
  61         return etag;
  62 }
  63
  64 PHP_HTTP_API size_t php_http_etag_update(void *ctx, const char *data_ptr, size_t data_len TSRMLS_DC)
  65 {
  66         char *mode = PHP_HTTP_G->env.etag_mode;
  67 #ifdef PHP_HTTP_HAVE_HASH
  68         const php_hash_ops *eho = NULL;
  69
  70         if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
  71                 eho->hash_update(ctx, (const unsigned char *) data_ptr, data_len);
  72         } else
  73 #endif
  74         if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
  75                 uint i, c = *((uint *) ctx);
  76                 for (i = 0; i < data_len; ++i) {
  77                         CRC32(c, data_ptr[i]);
  78                 }
  79                 *((uint *)ctx) = c;
  80         } else if (mode && (!strcasecmp(mode, "sha1"))) {
  81                 PHP_SHA1Update(ctx, (const unsigned char *) data_ptr, data_len);
  82         } else {
  83                 PHP_MD5Update(ctx, (const unsigned char *) data_ptr, data_len);
  84         }
  85
  86         return data_len;
  87 }
  88