Extracting files with their default date & time

[GIN-X44]

Hello, how can i extract the files with their default time and date from the zip file?

For example, i want to extract the mymovie.mp4 that made in Dec 12, 2019 at 5:15 am from the zip file... how could i do extract the mp4 file without using a write new stream like ra.DataStream()??

[GWRon]

As it is up to you on "how" you store the unarchived data, it will be also up to you to modify the file time of the created file (the file you just unpacked).

[GWRon]

brl.filesystem offers what you want:

Function SetFileTime( path:String, time:Long, timeType:Int=FILETIME_MODIFIED)
    FixPath path
    If MaxIO.ioInitialized Then
        ' Not available
    Else
        Select timetype
            Case FILETIME_MODIFIED
                utime_(path, timeType, time)
            Case FILETIME_ACCESSED
                utime_(path, timeType, time)
        End Select
    End If
End Function

The examples for each archive-format contain this:

Local entry:TArchiveEntry = New TArchiveEntry

Local ra:TReadArchive = New TReadArchive
ra.SetFormat(EArchiveFormat.ZIP)
ra.Open("data.zip")

While ra.ReadNextHeader(entry) = ARCHIVE_OK
    Print "File : " + entry.Pathname()
    Print "Size : " + entry.Size()
    Print "Type : " + entry.FileType().ToString()
    Local s:String = LoadText(ra.DataStream())
    Print "String size   : " + s.Length
    Print "First n chars : " + s[0..17]
    Print
Wend

This TArchiveEntry is defined in archive.mod/core.mod/core.bmx. It has methods like:

    Rem
    bbdoc: Returns the entry birth time, if set.
    End Rem
    Method BirthTime:Long()

    Rem
    bbdoc: 
    End Rem
    Method BirthTimeIsSet:Int()

    Rem
    bbdoc: Returns the entry creation time, if set.
    End Rem
    Method CreationTime:Long()

    Rem
    bbdoc: Returns #True if the creation time is set.
    End Rem
    Method CreationTimeIsSet:Int()

dunno if one of these is useful for you. For "modifiedtime" I only saw a setter (for now)

[GWRon]

I added a Getter for "ModifiedTime" but it says "0" as it does for all other values in "zip.mod/example_01.bmx"

glue.c:

BBInt64 bmx_libarchive_archive_entry_mtime(struct archive_entry * entry) {
    return archive_entry_mtime(entry);
}

core.bmx: TType TArchiveEntry

    Rem
    bbdoc: Returns the entries modified time, if set.
    End Rem
    Method ModifiedTime:Long()
        return bmx_libarchive_archive_entry_mtime(entryPtr)
    End Method

[ 88%] Processing:example_01.bmx
[ 94%] Compiling:example_01.bmx.gui.release.linux.x64.c
[100%] Linking:example_01
Executing:example_01
File : files/testdata.txt
Size : 67
Type : File
ModifiedTime : 1643357849
AccessTime : 0
Birthtime : 0
CreationTime : 0
String size   : 67
First n chars : This is some data

Archiver thinks it is from january 2022:

So ... numbers for "Modifiedtime" work.

[GWRon]

Seems there is some confusion in the archive.mod-assumptions:

    Rem
    bbdoc: Returns the entry creation time, if set.
    End Rem
    Method CreationTime:Long()
        return bmx_libarchive_archive_entry_ctime(entryPtr)
    End Method

"ctime" is not the creation time - creation time is "birthtime".

These functions create and manipulate the time fields in an archive_entry. Supported time fields are atime (access time), birthtime (creation time), ctime (last time an inode property was changed) and mtime (modification time).

source: https://nxmnpg.lemoda.net/3/archive_entry_mtime

[GWRon]

Once Brucey added the modified-time getter it should be breeze:

• extract the file
• store the mtime / modified time in a variable
• call SetFileTime( pathToThatFile, mtimeYouStored, FILETIME_MODIFIED)

[GIN-X44]

Thank you so much GWRon for giving time to answer my questions. 🙏 And can you give me a proper example of how to extract a file with their original date&time... with those methods?

[GIN-X44]

Hello Bruce, can you please add more bmx examples in ’archive.mod/zip.mod/examples/’ Thanks.