gistfile1.diff

diff --git a/Callgrind Viewer/FileLoader.m b/Callgrind Viewer/FileLoader.m
index 823e128..2a6c906 100644
--- a/Callgrind Viewer/FileLoader.m     
+++ b/Callgrind Viewer/FileLoader.m     
@@ -48,6 +48,7 @@ static inline ssize_t indexOfNextNewLineChar(const char* data, size_t offset, si
     if ([_pendingDataBuffer length] > 0) {
         ssize_t nextNewLine = indexOfNextNewLineChar(data, 0, size);
         if (nextNewLine >= 0) {
+            assert(nextNewLine <= size);
             [_pendingDataBuffer appendBytes:data length:nextNewLine];
             [self processLine:(const char*)[_pendingDataBuffer bytes] size:[_pendingDataBuffer length]];
             workOffset = nextNewLine + 1;
@@ -65,13 +66,19 @@ static inline ssize_t indexOfNextNewLineChar(const char* data, size_t offset, si
     while (true) {
         ssize_t nextNewLine = indexOfNextNewLineChar(data, workOffset, size);
         if (nextNewLine >= 0) {
+            assert(workOffset < size);
+            assert(nextNewLine < size);
             [self processLine: (data + workOffset) size:(nextNewLine - workOffset)];
             workOffset = nextNewLine + 1;
         } else {
+            assert(workOffset <= size);
             size_t bytesLeft = size - workOffset;
+            if (!bytesLeft)
+                return YES;
             if (bytesLeft > maxBufferSize)
                 return NO;
             assert([_pendingDataBuffer length] == 0);
+            assert((workOffset + bytesLeft) == size);
             [_pendingDataBuffer appendBytes:(data + workOffset) length:bytesLeft];
             return YES;
         }