golib/archive

Package Archive

This package will try to do all uncompress/unarchive and extract one file or all file. This package will expose 2 functions :

• ExtractFile : for one file extracted
• ExtractAll : to extract all file

Example of implementation

Example of one file extracted

To use ExtractFile function, you will need this parameters :

• src : is the source file into a ioutils.FileProgress struct to expose an os.File pointer with interface io.WriteTo, io.ReadFrom, io.ReaderAt and progress capabilities
• dst : is the source file into a ioutils.FileProgress struct to expose an os.File pointer with interface io.WriteTo, io.ReadFrom, io.ReaderAt and progress capabilities
• filenameContain : is a string to search in the file name to find it and extract it. This string will be search into the strings.Contains function
• filenameRegex : is a regex pattern string to search in the file name any match and extract it. This string will be search into the regexp.MatchString function

You can implement this function as it. This example is available in test/test-archive folder.

 import (
	"io"
	"io/ioutil"

	"github.com/nabbar/golib/archive"
	"github.com/nabbar/golib/ioutils"
)

const fileName = "fullpath to my archive file"

func main() {
	var (
		src ioutils.FileProgress
		dst ioutils.FileProgress
		err errors.Error
	)

	// register closing function in output function callback
  defer func() {
		if src != nil {
			_ = src.Close()
		}
		if dst != nil {
			_ = dst.Close()
		}
	}()

	// open archive with a ioutils NewFileProgress function
  if src, err = ioutils.NewFileProgressPathOpen(fileName); err != nil {
		panic(err)
	}

	// open a destination with a ioutils NewFileProgress function, as a temporary file
	if dst, err = ioutils.NewFileProgressTemp(); err != nil {
		panic(err)
	}

  // call the extract file function
	if err = archive.ExtractFile(tmp, rio, "path/to/my/file/into/archive", "archive name regex"); err != nil {
		panic(err)
	}
  
}

Example of all files extracted

To use ExtractAll function, you will need this parameters :

• src : is the source file into a ioutils.FileProgress struct to expose an os.File pointer with interface io.WriteTo, io.ReadFrom, io.ReaderAt and progress capabilities
• originalName : is a string to define the originalName of the archive. This params is used to create a unique file created into the outputPath if the archive is not an archive or just compressed with a not catalogued compress type like gzip or bzip2.
• outputPath : is a string to precise the destination output directory (full path). All extracted file will be extracted with this directory as base of path.
• defaultDirPerm : is a os.FileMode to precise the permission of directory. This parameters is usefull if the output directory is not existing.

You can implement this function as it. This example is available in test/test-archive-all folder.

 import (
	"io"
	"io/ioutil"

	"github.com/nabbar/golib/archive"
	"github.com/nabbar/golib/ioutils"
)

const fileName = "fullpath to my archive file"

func main() {
	var (
		src ioutils.FileProgress
		tmp ioutils.FileProgress
		out string
		err error
	)
 
  // open archive with a ioutils NewFileProgress function 
	if src, err = ioutils.NewFileProgressPathOpen(fileName); err != nil {
		panic(err)
	}

  // create an new temporary file to use his name as output path
	if tmp, err = ioutils.NewFileProgressTemp(); err != nil {
		panic(err)
	} else {
    // get the filename of the temporary file
		out = tmp.FilePath()
    
    // close the temporary file will call the delete temporary file
		_ = tmp.Close()
	}
  
  if err = archive.ExtractAll(src, path.Base(src.FilePath()), out, 0775); err != nil {
		panic(err)
	}
  
}