Integration with hash extension

README.md

@@ -21,6 +21,20 @@ This extension adds one new PHP function:
 
 It will checksum the string, and return the checksum.
 
+## `hash()` integration
+
+It also registers the `xx32` hash algorithm to be used in the [`hash()`](http://www.php.net/manual/en/ref.hash.php) function family:
+
+```
+    hash('xx32', $data);
+
+Or:
+
+    $h = hash_init('xx32');
+    hash_update($h, $data);
+    echo hash_final($h);
+```
+
 ## License
 
-BSD 2-clause license.
+BSD 2-clause license.

php_xxhash.c

@@ -6,15 +6,56 @@
 #include "php_ini.h"
 #include "ext/standard/info.h"
 #include "php_xxhash.h"
+#include "ext/hash/php_hash.h"
 
 #include "xxhash.c"
 
 #ifdef COMPILE_DL_XXHASH
 ZEND_GET_MODULE(xxhash)
 #endif
 
+typedef struct {
+	void *state;
+} PHP_XXH32_CTX;
+
+PHP_HASH_API void PHP_XXH32Init(PHP_XXH32_CTX *context)
+{
+	context->state = XXH32_init(0);
+}
+
+PHP_HASH_API void PHP_XXH32Update(PHP_XXH32_CTX *context, const unsigned char *input, unsigned int inputLen)
+{
+	XXH32_feed(context->state, (void *)input, (int)inputLen);
+}
+
+PHP_HASH_API void PHP_XXH32Final(unsigned char digest[4], PHP_XXH32_CTX *context)
+{
+	unsigned int h32;
+
+	h32 = XXH32_result(context->state);
+
+	digest[0] = (unsigned char) ((h32 >> 24) & 0xff);
+	digest[1] = (unsigned char) ((h32 >> 16) & 0xff);
+	digest[2] = (unsigned char) ((h32 >> 8) & 0xff);
+	digest[3] = (unsigned char) (h32 & 0xff);
+
+	context->state = XXH32_init(0);
+}
+
+const php_hash_ops php_hash_xxh32_ops = {
+	(php_hash_init_func_t) PHP_XXH32Init,
+	(php_hash_update_func_t) PHP_XXH32Update,
+	(php_hash_final_func_t) PHP_XXH32Final,
+	(php_hash_copy_func_t) php_hash_copy,
+	4,
+	4,
+	sizeof(PHP_XXH32_CTX)
+};
+
 PHP_MINIT_FUNCTION(xxhash)
 {
+	php_hash_register_algo("xx32", &php_hash_xxh32_ops);
+
 	return SUCCESS;
 }