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Diffstat (limited to 'Classes/Source/CDataScanner.m')
| -rw-r--r-- | Classes/Source/CDataScanner.m | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/Classes/Source/CDataScanner.m b/Classes/Source/CDataScanner.m new file mode 100644 index 0000000..b3cee6f --- /dev/null +++ b/Classes/Source/CDataScanner.m @@ -0,0 +1,340 @@ +// +// CDataScanner.m +// TouchCode +// +// Created by Jonathan Wight on 04/16/08. +// Copyright 2008 toxicsoftware.com. All rights reserved. +// +// Permission is hereby granted, free of charge, to any person +// obtaining a copy of this software and associated documentation +// files (the "Software"), to deal in the Software without +// restriction, including without limitation the rights to use, +// copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the +// Software is furnished to do so, subject to the following +// conditions: +// +// The above copyright notice and this permission notice shall be +// included in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES +// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT +// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +// OTHER DEALINGS IN THE SOFTWARE. +// + +#import "CDataScanner.h" + +#import "CDataScanner_Extensions.h" + +@interface CDataScanner () +@end + +#pragma mark - + +inline static unichar CharacterAtPointer(void *start, void *end) + { + #pragma unused(end) + + const u_int8_t theByte = *(u_int8_t *)start; + if (theByte & 0x80) + { + // TODO -- UNICODE!!!! (well in theory nothing todo here) + } + const unichar theCharacter = theByte; + return(theCharacter); + } + + static NSCharacterSet *sDoubleCharacters = NULL; + + @implementation CDataScanner + +- (id)init + { + if ((self = [super init]) != NULL) + { + } + return(self); + } + +- (id)initWithData:(NSData *)inData; + { + if ((self = [self init]) != NULL) + { + [self setData:inData]; + } + return(self); + } + + + (void)initialize + { + if (sDoubleCharacters == NULL) + { + sDoubleCharacters = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789eE-+."] retain]; + } + } + +- (void)dealloc + { + [data release]; + data = NULL; + // + [super dealloc]; + } + +- (NSUInteger)scanLocation + { + return(current - start); + } + +- (NSUInteger)bytesRemaining + { + return(end - current); + } + +- (NSData *)data + { + return(data); + } + +- (void)setData:(NSData *)inData + { + if (data != inData) + { + [data release]; + data = [inData retain]; + } + + if (data) + { + start = (u_int8_t *)data.bytes; + end = start + data.length; + current = start; + length = data.length; + } + else + { + start = NULL; + end = NULL; + current = NULL; + length = 0; + } + } + +- (void)setScanLocation:(NSUInteger)inScanLocation + { + current = start + inScanLocation; + } + +- (BOOL)isAtEnd + { + return(self.scanLocation >= length); + } + +- (unichar)currentCharacter + { + return(CharacterAtPointer(current, end)); + } + +#pragma mark - + +- (unichar)scanCharacter + { + const unichar theCharacter = CharacterAtPointer(current++, end); + return(theCharacter); + } + +- (BOOL)scanCharacter:(unichar)inCharacter + { + unichar theCharacter = CharacterAtPointer(current, end); + if (theCharacter == inCharacter) + { + ++current; + return(YES); + } + else + return(NO); + } + +- (BOOL)scanUTF8String:(const char *)inString intoString:(NSString **)outValue + { + const size_t theLength = strlen(inString); + if ((size_t)(end - current) < theLength) + return(NO); + if (strncmp((char *)current, inString, theLength) == 0) + { + current += theLength; + if (outValue) + *outValue = [NSString stringWithUTF8String:inString]; + return(YES); + } + return(NO); + } + +- (BOOL)scanString:(NSString *)inString intoString:(NSString **)outValue + { + if ((size_t)(end - current) < inString.length) + return(NO); + if (strncmp((char *)current, [inString UTF8String], inString.length) == 0) + { + current += inString.length; + if (outValue) + *outValue = inString; + return(YES); + } + return(NO); + } + +- (BOOL)scanCharactersFromSet:(NSCharacterSet *)inSet intoString:(NSString **)outValue + { + u_int8_t *P; + for (P = current; P < end && [inSet characterIsMember:*P] == YES; ++P) + ; + + if (P == current) + { + return(NO); + } + + if (outValue) + { + *outValue = [[[NSString alloc] initWithBytes:current length:P - current encoding:NSUTF8StringEncoding] autorelease]; + } + + current = P; + + return(YES); + } + +- (BOOL)scanUpToString:(NSString *)inString intoString:(NSString **)outValue + { + const char *theToken = [inString UTF8String]; + const char *theResult = strnstr((char *)current, theToken, end - current); + if (theResult == NULL) + { + return(NO); + } + + if (outValue) + { + *outValue = [[[NSString alloc] initWithBytes:current length:theResult - (char *)current encoding:NSUTF8StringEncoding] autorelease]; + } + + current = (u_int8_t *)theResult; + + return(YES); + } + +- (BOOL)scanUpToCharactersFromSet:(NSCharacterSet *)inSet intoString:(NSString **)outValue + { + u_int8_t *P; + for (P = current; P < end && [inSet characterIsMember:*P] == NO; ++P) + ; + + if (P == current) + { + return(NO); + } + + if (outValue) + { + *outValue = [[[NSString alloc] initWithBytes:current length:P - current encoding:NSUTF8StringEncoding] autorelease]; + } + + current = P; + + return(YES); + } + +- (BOOL)scanNumber:(NSNumber **)outValue + { + NSString *theString = NULL; + if ([self scanCharactersFromSet:sDoubleCharacters intoString:&theString]) + { + if ([theString rangeOfString:@"."].location != NSNotFound) + { + if (outValue) + { + *outValue = [NSDecimalNumber decimalNumberWithString:theString]; + } + return(YES); + } + else if ([theString rangeOfString:@"-"].location != NSNotFound) + { + if (outValue != NULL) + { + *outValue = [NSNumber numberWithLongLong:[theString longLongValue]]; + } + return(YES); + } + else + { + if (outValue != NULL) + { + *outValue = [NSNumber numberWithUnsignedLongLong:strtoull([theString UTF8String], NULL, 0)]; + } + return(YES); + } + + } + return(NO); + } + +- (BOOL)scanDecimalNumber:(NSDecimalNumber **)outValue; + { + NSString *theString = NULL; + if ([self scanCharactersFromSet:sDoubleCharacters intoString:&theString]) + { + if (outValue) + { + *outValue = [NSDecimalNumber decimalNumberWithString:theString]; + } + return(YES); + } + return(NO); + } + +- (BOOL)scanDataOfLength:(NSUInteger)inLength intoData:(NSData **)outData; + { + if (self.bytesRemaining < inLength) + { + return(NO); + } + + if (outData) + { + *outData = [NSData dataWithBytes:current length:inLength]; + } + + current += inLength; + return(YES); + } + + +- (void)skipWhitespace + { + u_int8_t *P; + for (P = current; P < end && (isspace(*P)); ++P) + ; + + current = P; + } + +- (NSString *)remainingString + { + NSData *theRemainingData = [NSData dataWithBytes:current length:end - current]; + NSString *theString = [[[NSString alloc] initWithData:theRemainingData encoding:NSUTF8StringEncoding] autorelease]; + return(theString); + } + +- (NSData *)remainingData; + { + NSData *theRemainingData = [NSData dataWithBytes:current length:end - current]; + return(theRemainingData); + } + + @end |