88 lines
2.0 KiB
Objective-C
88 lines
2.0 KiB
Objective-C
#import "ElementOCNT.h"
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// implements ZCNT, OCNT, BCNT, BZCT, WCNT, WZCT, LCNT, LZCT
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@implementation ElementOCNT
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- (id)copyWithZone:(NSZone *)zone
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{
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ElementOCNT *element = [super copyWithZone:zone];
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if(!element) return nil;
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// always reset counter on copy
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[element setValue:0];
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return element;
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}
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- (void)readDataFrom:(TemplateStream *)stream
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{
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value = 0;
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if ([type isEqualToString:@"LCNT"] || [type isEqualToString:@"LZCT"]) [stream readAmount:4 toBuffer:&value];
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else if([type isEqualToString:@"BCNT"] || [type isEqualToString:@"BZCT"]) [stream readAmount:1 toBuffer:(char *)(&value)+3];
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else [stream readAmount:2 toBuffer:(short *)(&value)+1];
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value = CFSwapInt32BigToHost(value);
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if([self countFromZero]) value += 1;
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}
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- (unsigned int)sizeOnDisk
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{
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if ([type isEqualToString:@"LCNT"] || [type isEqualToString:@"LZCT"]) return 4;
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else if([type isEqualToString:@"BCNT"] || [type isEqualToString:@"BZCT"]) return 1;
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else return 2;
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}
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- (void)writeDataTo:(TemplateStream *)stream
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{
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if([self countFromZero]) value -= 1;
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unsigned long tmp = CFSwapInt32HostToBig(value);
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if ([type isEqualToString:@"LCNT"] || [type isEqualToString:@"LZCT"]) [stream writeAmount:4 fromBuffer:&tmp];
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else if([type isEqualToString:@"BCNT"] || [type isEqualToString:@"BZCT"]) [stream writeAmount:1 fromBuffer:(char *)(&tmp)+3];
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else [stream writeAmount:2 fromBuffer:(short *)(&tmp)+1];
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if([self countFromZero]) value += 1;
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}
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- (BOOL)countFromZero
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{
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return [type isEqualToString:@"ZCNT"] ||
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[type isEqualToString:@"BZCT"] ||
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[type isEqualToString:@"WZCT"] ||
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[type isEqualToString:@"LZCT"];
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}
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- (void)setValue:(unsigned long)v
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{
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value = v;
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}
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- (unsigned long)value
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{
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return value;
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}
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- (void)increment
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{
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[self setValue:value+1]; // using -setValue for KVO
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}
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- (void)decrement
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{
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if(value > 0)
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[self setValue:value-1];
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}
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- (NSString *)stringValue
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{
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return [NSString stringWithFormat:@"%ld", value];
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}
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- (void)setStringValue:(NSString *)str
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{
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}
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- (BOOL)editable
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{
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return NO;
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}
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@end
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