Fix an issue where Sequel Pro added a NUL byte to the end of every query (fixes #2184)

We tried to convert the query string into a c string that could contain NUL bytes - which by definition a c string cannot (making it a byte buffer with a terminating NUL byte) and then tried to pass that to mysql_real_query() which expects a byte buffer anyway.

Author: dmoagx

Frameworks/SPMySQLFramework/Source/SPMySQLConnection Categories/Conversion.m

@@ -40,9 +40,11 @@ @implementation SPMySQLConnection (Conversion)
  * the current encoding, a representation will be returned rather than null.
  * The returned cString will correctly preserve any nul characters within the string,
  * which prevents the use of faster functions like [NSString cStringUsingEncoding:].
- * Pass in the third parameter to receive the length of the converted string, or pass
- * in NULL if you do not want this information.
+ * Pass in the third parameter to receive the length of the converted string (INCLUDING
+ * the terminating \0 character), or pass in NULL if you do not want this information.
  */
+#warning This method doesn't make sense. It's only addition over [str dataUsingEncoding:allowLossyConversion:] is the terminating NUL byte. \
+         But the "string" can already contain NUL bytes, so it's not a valid c string anyway.
 + (const char *)_cStringForString:(NSString *)aString usingEncoding:(NSStringEncoding)anEncoding returningLengthAs:(NSUInteger *)cStringLengthPointer
 {
 
@@ -56,7 +58,7 @@ + (const char *)_cStringForString:(NSString *)aString usingEncoding:(NSStringEnc
 	// Take the converted data - not null-terminated - and copy it to a null-terminated buffer
 	char *cStringBytes = malloc(convertedDataLength + 1);
 	memcpy(cStringBytes, [convertedData bytes], convertedDataLength);
-	cStringBytes[convertedDataLength] = 0L;
+	cStringBytes[convertedDataLength] = '\0';
 
 	if (cStringLengthPointer) *cStringLengthPointer = convertedDataLength+1;
 

Frameworks/SPMySQLFramework/Source/SPMySQLConnection Categories/Querying & Preparation.m

@@ -264,16 +264,17 @@ - (id)queryString:(NSString *)theQueryString usingEncoding:(NSStringEncoding)the
 		[delegate willQueryString:theQueryString connection:self];
 	}
 
-	// Retrieve a C-style query string from the supplied NSString
-	NSUInteger cQueryStringLength;
-	const char *cQueryString = _cStringForStringWithEncoding(theQueryString, theEncoding, &cQueryStringLength);
+	// Retrieve a byte buffer from the supplied NSString
+	NSData *queryData = [theQueryString dataUsingEncoding:theEncoding allowLossyConversion:YES];
+	NSUInteger queryBytesLength = [queryData length];
+	const char *queryBytes = [queryData bytes];
 
 	// Check the query length against the current maximum query length.  If it is
 	// larger, the query would error (and probably cause a disconnect), so if
 	// the maximum size is editable, increase it and reconnect.
-	if (cQueryStringLength > maxQuerySize) {
+	if (queryBytesLength > maxQuerySize) {
 		queryActionShouldRestoreMaxQuerySize = maxQuerySize;
-		if (![self _attemptMaxQuerySizeIncreaseTo:(cQueryStringLength + 1024)]) {
+		if (![self _attemptMaxQuerySizeIncreaseTo:(queryBytesLength + 1024)]) {
 			queryActionShouldRestoreMaxQuerySize = NSNotFound;
 			return nil;
 		}
@@ -292,7 +293,7 @@ - (id)queryString:(NSString *)theQueryString usingEncoding:(NSStringEncoding)the
 		// While recording the overall execution time (including network lag!), run
 		// the raw query
 		uint64_t queryStartTime = mach_absolute_time();
-		queryStatus = mysql_real_query(mySQLConnection, cQueryString, cQueryStringLength);
+		queryStatus = mysql_real_query(mySQLConnection, queryBytes, queryBytesLength);
 		queryExecutionTime = _elapsedSecondsSinceAbsoluteTime(queryStartTime);
 		lastConnectionUsedTime = mach_absolute_time();