Get texture file size, resolution and type.

Hi!
My script parsing every layer of AE Composition and creating the list of used textures (files).
Then copy files in one folder.
But I would also to compute overall size of all files and to warn user if he break the limit (for example, 10MB for all textures).
Can you advise me please the right way to get by AE script:
1. file size.
2. texture resolution.
3. texture color depth (is it 16 bits, 32 bits etc...)
4. actual type of the texture file (.tga, for example). I mean exact type detection, not extension recognition.
I've checked AE Scripting Guide, and tried to google it, but unsuccessfully
Is it possible in After Effect?
Thank you in advance!

The attributes to an AVItem still image (jpg for this example) are as follows:
var myItem = app.project.item(1);     //Assumes your still image file is the first item in the project window's list
myItem.comment
myItem.duration
myItem.file
myItem.footageMissing
myItem.frameDuration
myItem.frameRate
myItem.hasAudio
myItem.hasVideo
myItem.height
myItem.id
myItem.label
myItem.mainSource
myItem.name
myItem.parentFolder
myItem.pixelAspect
myItem.proxySource
myItem.selected
myItem.time
myItem.typeName
myItem.useProxy
myItem.usedIn
myItem.width
To access the source file attributes use:
myItem.file
You then can access file specifics:
myItem.file.absoluteURI
myItem.file.alias
myItem.file.created               //Returns date file was created
myItem.file.creator
myItem.file.displayName
myItem.file.encoding
myItem.file.eof
myItem.file.error
myItem.file.exists
myItem.file.fsName
myItem.file.fullName
myItem.file.hidden
myItem.file.length               //Returns the file size in bytes
myItem.file.lineFeed
myItem.file.modified
myItem.file.name
myItem.file.parent
myItem.file.path
myItem.file.readonly
myItem.file.relativeURI
myItem.file.type               //Returns the type of file

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    Reason : Adding info

    >Multiplexing: None
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