add image_crc32 function

Author: netkiller

README.md

@@ -3,7 +3,7 @@ mysql-image-plugin
 
 Build
 -----
-	gcc -I/usr/include/mysql -I./ -fPIC -shared -o image.so image.c
+	gcc -O3  -g  -I/usr/include/mysql -I/usr/include/sys  -fPIC -shared -o image.so image.c
 	sudo mv image.so /usr/lib/mysql/plugin/
 
 Setup
@@ -20,11 +20,17 @@ Plugin
 	drop function image_check;
 	drop function image_remove;
 	drop function image_rename;
+	drop function image_crc32;
+	drop function image_md5sum;
 
 	create function image_check returns string soname 'image.so';
 	create function image_remove returns string soname 'image.so';
 	create function image_rename returns string soname 'image.so';
+	create function image_crc32 returns string soname 'image.so';
+	create function image_md5sum returns string soname 'image.so';
 
 	select image_check('/tmp/filename');
 	select image_remove('/tmp/filename');
-	select image_rename('/tmp/aa','/tmp/bb');
+	select image_rename('/tmp/aa','/tmp/bb');
+	select image_crc32('/tmp/test.jpg');
+	select image_md5sum('/tmp/test');

src/image.c

@@ -7,7 +7,7 @@ Author: netkiller<netkiller@msn.com>
 #include <mysql.h>
 #include <string.h>
 #include <io.h>
-
+#include <openssl/md5.h>
 #include "image.h"
 
 /* ------------------------ image_check ----------------------------- */
@@ -18,7 +18,7 @@ my_bool image_check_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
   if (args->arg_count != 1)
   {
     strncpy(message,
-            "two arguments must be supplied: image_check('<filename>').",
+            "one arguments must be supplied: image_check('<filename>').",
             MYSQL_ERRMSG_SIZE);
     return 1;
   }
@@ -168,3 +168,93 @@ void image_remove_deinit(UDF_INIT *initid)
 {
    return;
 }
+
+/* ------------------------ image_crc32 ----------------------------- */
+
+my_bool image_crc32_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
+{
+  if (args->arg_count != 1)
+  {
+    strncpy(message,
+            "one arguments must be supplied: image_crc32('<filename>').",
+            MYSQL_ERRMSG_SIZE);
+    return 1;
+  }
+
+  args->arg_type[0]= STRING_RESULT;
+    return 0;
+}
+
+char *image_crc32(UDF_INIT *initid, UDF_ARGS *args,
+                __attribute__ ((unused)) char *result,
+               unsigned long *length,
+                __attribute__ ((unused)) char *is_null,
+                __attribute__ ((unused)) char *error)
+{
+
+	char *status;
+	char *data;
+	
+	data = readfile( args->args[0]);
+	if( data != NULL ){
+		asprintf(&status, "%lu", crc32(0, (const void*)data, strlen(data)));
+	}else{
+		status = "false";
+	}
+	*length = strlen(status);
+	return ((char *)status);
+}
+
+void image_crc32_deinit(UDF_INIT *initid)
+{
+   return;
+}
+
+/* ------------------------ image_md5sum ----------------------------- */
+/*
+my_bool image_md5sum_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
+{
+  if (args->arg_count != 1)
+  {
+    strncpy(message,
+            "one arguments must be supplied: image_md5sum('<filename>').",
+            MYSQL_ERRMSG_SIZE);
+    return 1;
+  }
+
+  args->arg_type[0]= STRING_RESULT;
+    return 0;
+}
+
+char *image_md5sum(UDF_INIT *initid, UDF_ARGS *args,
+                __attribute__ ((unused)) char *result,
+               unsigned long *length,
+                __attribute__ ((unused)) char *is_null,
+                __attribute__ ((unused)) char *error)
+{
+
+	char *status;
+	char *data;
+	unsigned char digest[MD5_DIGEST_LENGTH];
+	char string[33];
+	int i;
+	data = readfile( args->args[0] );
+	if( data != NULL ){
+		MD5((unsigned char*)&data, strlen(data), (unsigned char*)&digest);    
+		for(i = 0; i < 16; i++)
+			 sprintf(&string[i*2], "%02x", (unsigned int)digest[i]);
+		 
+		asprintf(&status, "md5 digest: %s", string);
+		//status = string;
+	}else{
+		status = "false";
+	}
+	*length = strlen(status);
+	return ((char *)status);
+}
+
+void image_md5sum_deinit(UDF_INIT *initid)
+{
+   return;
+}
+*/

src/image.h

@@ -13,3 +13,32 @@ void image_remove_deinit(UDF_INIT *initid);
 my_bool image_rename_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
 char *image_rename(UDF_INIT *initid, UDF_ARGS *args, char *result, unsigned long *length, char *is_null, char *error);
 void image_rename_deinit(UDF_INIT *initid);
+
+my_bool image_crc32_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
+char *image_crc32(UDF_INIT *initid, UDF_ARGS *args, char *result, unsigned long *length, char *is_null, char *error);
+void image_crc32_deinit(UDF_INIT *initid);
+/*
+my_bool image_md5sum_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
+char *image_md5sum(UDF_INIT *initid, UDF_ARGS *args, char *result, unsigned long *length, char *is_null, char *error);
+void image_md5sum_deinit(UDF_INIT *initid);
+*/
+char * readfile(char * path)  
+{  
+    FILE * file;  
+    char * data;  
+	int *length;
+  
+    file = fopen(path, "rb");  
+    if (file == NULL)  
+    {  
+        return NULL;  
+    }  
+    fseek(file, 0, SEEK_END);  
+    *length = ftell(file);  
+    data = (char *)malloc((*length + 1) * sizeof(char));  
+    rewind(file);  
+    *length = fread(data, 1, *length, file);  
+    //data[*length] = '\0';  
+    fclose(file);  
+    return data;  
+}