don’t you just want: [bigData replaceBytesInRange:NSMakeRange(0, 1024) withBytes:NULL length:0];
?? I am sure NSMutableData is well optimized for shunting its contents around internally. Matt On 12 Jul 2014, at 20:36, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote: > Basically what I would like is an NSMutableData method like this: > > - (void)resetDataRangeTo:(NSRange)range > > Parameters > range > The range within the contents of the receiver to be considered the new > contents. > > > But, since that doesn't exist yet, is it safe to "shift" the contents in > place of an NSMutableData? I'm trying to avoid having to copy the contents, > which is > 1MB. > > In this example, I want to remove the leading 1024 bytes in a large > NSMutableData: > > NSMutableData *bigData = ... // (approx 1MB of data); > > UInt64 byte_shift = 1024; // skip over first 1024 bytes > UInt64 new_length = bigMutData.length-byte_shift; > NSRange moveRange = NSMakeRange(0,new_length); > > [bigMutData replaceBytesInRange:moveRange > withBytes:bigMutData.bytes+1024 > length:new_length]; > [bigMutData setLength:new_length]; > > -Carl > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/devlists.mg%40googlemail.com > > This email sent to devlists...@googlemail.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
