Slightly changed serialization format.

printf's %a was too fragile to serialize floats and doubles, as it was
behaving differently on different OSes and OS versions. Instead, a hex
representation of the float/double in big endian is used now. While this
is less readable, it is guaranteed to be accurate and always the same.

src/OFDate.m

@@ -323,6 +323,10 @@ static int month_to_day_of_year[12] = {
 
 	@try {
 		OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
+		union {
+			double d;
+			uint64_t u;
+		} d;
 
 		if (![[element name] isEqual: [self className]] ||
 		    ![[element namespace] isEqual: OF_SERIALIZATION_NS])
@@ -330,7 +334,8 @@ static int month_to_day_of_year[12] = {
 			    exceptionWithClass: [self class]
 				      selector: _cmd];
 
-		seconds = [element doubleValue];
+		d.u = (uint64_t)[element hexadecimalValue];
+		seconds = of_bswap_double_if_le(d.d);
 
 		[pool release];
 	} @catch (id e) {
@@ -410,10 +415,17 @@ static int month_to_day_of_year[12] = {
 {
 	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
 	OFXMLElement *element;
+	union {
+		double d;
+		uint64_t u;
+	} d;
 
 	element = [OFXMLElement elementWithName: [self className]
 				      namespace: OF_SERIALIZATION_NS];
-	[element setStringValue: [OFString stringWithFormat: @"%la", seconds]];
+
+	d.d = of_bswap_double_if_le(seconds);
+	[element setStringValue:
+	    [OFString stringWithFormat: @"%016" PRIx64, d.u]];
 
 	[element retain];
 	[pool release];

src/OFNumber.m

@@ -752,11 +752,25 @@
 			type = OF_NUMBER_INTMAX;
 			value.intmax = [element decimalValue];
 		} else if ([typeString isEqual: @"float"]) {
+			union {
+				float f;
+				uint32_t u;
+			} f;
+
+			f.u = (uint32_t)[element hexadecimalValue];
+
 			type = OF_NUMBER_FLOAT;
-			value.float_ = [element floatValue];
+			value.float_ = of_bswap_float_if_le(f.f);
 		} else if ([typeString isEqual: @"double"]) {
+			union {
+				double d;
+				uint64_t u;
+			} d;
+
+			d.u = (uint64_t)[element hexadecimalValue];
+
 			type = OF_NUMBER_DOUBLE;
-			value.double_ = [element doubleValue];
+			value.double_ = of_bswap_double_if_le(d.d);
 		} else
 			@throw [OFInvalidArgumentException
 			    exceptionWithClass: [self class]
@@ -1239,17 +1253,31 @@
 				  stringValue: @"signed"];
 		break;
 	case OF_NUMBER_FLOAT:;
+		union {
+			float f;
+			uint32_t u;
+		} f;
+
+		f.f = of_bswap_float_if_le(value.float_);
+
 		[element addAttributeWithName: @"type"
 				  stringValue: @"float"];
 		[element setStringValue:
-		    [OFString stringWithFormat: @"%a", value.float_]];
+		    [OFString stringWithFormat: @"%08" PRIx32, f.u]];
 
 		break;
 	case OF_NUMBER_DOUBLE:;
+		union {
+			double d;
+			uint64_t u;
+		} d;
+
+		d.d = of_bswap_double_if_le(value.double_);
+
 		[element addAttributeWithName: @"type"
 				  stringValue: @"double"];
 		[element setStringValue:
-		    [OFString stringWithFormat: @"%la", value.double_]];
+		    [OFString stringWithFormat: @"%016" PRIx64, d.u]];
 
 		break;
 	default:

src/OFObject+Serialization.m

@@ -46,7 +46,7 @@ int _OFObject_Serialization_reference;
 	root = [OFXMLElement elementWithName: @"serialization"
 				   namespace: OF_SERIALIZATION_NS];
 	[root addAttributeWithName: @"version"
-		       stringValue: @"0"];
+		       stringValue: @"1"];
 	[root addChild: element];
 
 	ret = [@"<?xml version='1.0' encoding='UTF-8'?>\n"

src/OFString+Serialization.m

@@ -57,7 +57,7 @@ int _OFString_Serialization_reference;
 		    exceptionWithClass: [self class]
 			      selector: _cmd];
 
-	if ([version decimalValue] > 0)
+	if ([version decimalValue] != 1)
 		@throw [OFUnsupportedVersionException
 		    exceptionWithClass: [self class]
 			       version: version];

src/asprintf.m

@@ -20,10 +20,6 @@
 #include <stdlib.h>
 #include <stdarg.h>
 
-#ifdef __MINGW32__
-# define vsnprintf _vsnprintf
-#endif
-
 int
 vasprintf(char **cString, const char *format, va_list arguments)
 {

tests/serialization.xml

@@ -1,14 +1,14 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<serialization xmlns='https://webkeks.org/objfw/serialization' version='0'>
+<serialization xmlns='https://webkeks.org/objfw/serialization' version='1'>
   <OFMutableDictionary>
     <key>
       <OFArray>
         <OFString>Qu&quot;xbar
 test</OFString>
         <OFNumber type='signed'>1234</OFNumber>
-        <OFNumber type='double'>0x1.34a456d5cfaadp+10</OFNumber>
+        <OFNumber type='double'>adfa5c6d454a9340</OFNumber>
         <OFMutableString>asd</OFMutableString>
-        <OFDate>0x1.34a456d5cfaadp+10</OFDate>
+        <OFDate>adfa5c6d454a9340</OFDate>
       </OFArray>
     </key>
     <object>