Re: Where are my bytes?
Re: Where are my bytes?
- Subject: Re: Where are my bytes?
- From: Ken Thomases <email@hidden>
- Date: Sat, 04 Apr 2015 05:21:44 -0500
On Apr 4, 2015, at 4:23 AM, Gerriet M. Denkmann <email@hidden> wrote:
> When I look at " /Library/Dictionaries/Apple Dictionary.dictionary/Contents/Info.plist" in Finder, it shows a preview and says 5 kB. Ok.
>
> But: Finder → FIle → Get Info says:
> 4,893 bytes (Zero bytes on disk)
>
> And lstat shows:
> st_size = 4893 (file size, in bytes)
> st_blocks = 0 (blocks allocated for file)
> st_flags = 0x20 (user defined flags for file)
>
> /usr/include/sys/stat.h has:
> #define UF_COMPRESSED 0x00000020 /* file is hfs-compressed */
>
> So: where are these bytes (if not on disk)?
> And if they are really compressed: how much space they take in some unknown compressed location?
>
> I am trying to find who or what is taking space on my disk. So given some directory, I want to add the disk space of all its files (+ subdirectories).
In this case, the compressed data was probably small enough to store it in the file metadata. So, there really are no blocks allocated for the file's data.
Do some web searching for "hfs compression" to learn more.
As far as how you should write a program to compute the space used on disk, I recommend that you trust NSURLTotalFileAllocatedSizeKey.
Regards,
Ken
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