Which is better?

Kye

Hey Guys, I have a few more general questions that·I hope a few people answer on the funtionality for a new file system driver I'm making.

So...

Which is better? Being able to open a file for either·reading or writing? Or being able to open a file for reading and writing?

If the file is open for both at the same time then when reading the file I will still have to flush data to the disk before getting the next chunk which could slow down file read speed... signifacntly.

However, you get the ability to switch between reading and writing seemlessly.·So what is perfered?

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Nyamekye,

Kye

Also, should I use booleans as options for funtions or characters?

Like for example when making a new file or directory you could just pass true for a directory and false for a file as the option. Or you could pass "d" for a directory and "f" for a file.



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Nyamekye,

Dr_Acula

I've never used files that can be read and written. I tend to use the first option, open for read, or open for write. If you want to do both, open it for write, write something, close it then open it again and read it.

Go for the faster option?

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www.smarthome.viviti.com/propeller

kwinn

Definitely good to have the ability to open a file for read only. Either write only or read/write would be acceptable, although all 3 options would be preferable.

Cluso99

Read/Write/ReadWrite - all 3 options please.

Use "f" & "d".

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Links to other interesting threads:

· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
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· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm

jazzed

Try read, write, read/write, and append in binary or text mode. Use constants for mode selection rather than cryptic characters.
The C stdio.h f* functions file API model is clear, simple, and widely understood (missing UTF handling, but that is too big anyway).

heater

There has been a question recently about using 4Gb SD cards with the Prop. Looks like this will be a growing concern. I remember Kye mentioned partitions and master boot records a while back. Perhaps we will be needing those sooner rather than later.

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For me, the past is not over yet.

Cluso99

2GB will be available for a long time to come as lots of cameras cannot use above 2GB cards. If you have noticed in the shops there are lots of 2GB plus larger ones.

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Links to other interesting threads:

· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)
· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm

Toby Seckshund

And the *********s are charging more and more for the "historical" 2GB that they have a captive market for.

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Style and grace : Nil point

Kye

As for SD card concerns I'll be reverse engineering the FSRW block driver to fit my needs. Since it supports SDHC I'll be able to supprt SDHC. I also have a 16GB card to test this with which is good.

I think I can support all three file open modes. And yes append has already been included.

Thanks guys, I'll have a preview screening of the driver hopefully done before the end of the week.

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Nyamekye,

Post Edited (Kye) : 12/28/2009 5:56:30 PM GMT

lonesock

heater said...
There has been a question recently about using 4Gb SD cards with the Prop. Looks like this will be a growing concern. I remember Kye mentioned partitions and master boot records a while back. Perhaps we will be needing those sooner rather than later.

You can definitely use > 2 GB already, you just have to use FAT32 instead of FAT16.

Kye, make sure you pull the latest block driver, it's in the OBEX version 2.6 release.

Jonathan

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lonesock
Piranha are people too.