1 files changed, 53 insertions, 0 deletions
diff --git a/Source/SPDataAdditions.m b/Source/SPDataAdditions.m
index 8b2207c5..65605577 100644
--- a/Source/SPDataAdditions.m
+++ b/Source/SPDataAdditions.m
@@ -39,6 +39,11 @@
 #include <stdlib.h>
 #import "SPFunctions.h"
 
+/** Limit an NSUInteger to unsigned 32 bit max.
+ * @return Whatever is smaller: UINT32_MAX or i
+ *
+ * This is pretty much a NOOP on 32 bit platforms.
+ */
 uint32_t LimitUInt32(NSUInteger i);
 
 #pragma mark -
@@ -433,6 +438,54 @@ uint32_t LimitUInt32(NSUInteger i);
 	return string;
 }
 
+- (void)enumerateLinesBreakingAt:(SPLineTerminator)lbChars withBlock:(void (^)(NSRange line,BOOL *stop))block
+{
+	if(lbChars == SPLineTerminatorAny) lbChars = SPLineTerminatorCR|SPLineTerminatorLF|SPLineTerminatorCRLF;
+	
+	const uint8_t *bytes = [self bytes];
+	NSUInteger length = [self length];
+	
+	NSUInteger curStart = 0;
+	SPLineTerminator terminatorFound = 0;
+	NSUInteger i;
+	for (i = 0; i < length; i++) {
+		uint8_t chr = bytes[i];
+		// if looking for cr and/or crlf we look for cr otherwise for lf
+		if(((lbChars & SPLineTerminatorCRLF) || (lbChars & SPLineTerminatorCR)) && chr == '\r') {
+			//if we are looking for CRLF check for the following LF
+			if((lbChars & SPLineTerminatorCRLF) && ((i+1) < length) && bytes[i+1] == '\n') {
+				terminatorFound = SPLineTerminatorCRLF;
+			}
+			//if we were looking for CR we've found one
+			else if((lbChars & SPLineTerminatorCR)) {
+				terminatorFound = SPLineTerminatorCR;
+			}
+		}
+		else if((lbChars & SPLineTerminatorLF) && chr == '\n') {
+			terminatorFound = SPLineTerminatorLF;
+		}
+		// no linebreak yet ?
+		if(!terminatorFound) continue;
+		
+		// found one. call the block.
+		BOOL stop = NO;
+		NSRange lineRange = NSMakeRange(curStart, (i-curStart));
+		block(lineRange,&stop);
+		if(stop) return;
+		
+		// reset vars for next line
+		if(terminatorFound == SPLineTerminatorCRLF) i++; //skip the \n in CRLF
+		curStart = (i+1);
+		terminatorFound = 0;
+	}
+	// there could we one unterminated line left in buffer
+	if(curStart < i) {
+		NSRange lineRange = NSMakeRange(curStart, (i-curStart));
+		BOOL iDontCare = NO;
+		block(lineRange,&iDontCare);
+	}
+}
+
 @end
 
 #pragma mark -