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425 lines
17 KiB
Plaintext
425 lines
17 KiB
Plaintext
Documentation for class Archive_Tar
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===================================
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Last update : 2001-08-15
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Overview :
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----------
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The Archive_Tar class helps in creating and managing GNU TAR format
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files compressed by GNU ZIP or not.
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The class offers basic functions like creating an archive, adding
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files in the archive, extracting files from the archive and listing
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the archive content.
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It also provide advanced functions that allow the adding and
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extraction of files with path manipulation.
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Sample :
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--------
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// ----- Creating the object (uncompressed archive)
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->setErrorHandling(PEAR_ERROR_PRINT);
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// ----- Creating the archive
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$v_list[0]="file.txt";
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$v_list[1]="data/";
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$v_list[2]="file.log";
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$tar_object->create($v_list);
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// ----- Adding files
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$v_list[0]="dev/file.txt";
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$v_list[1]="dev/data/";
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$v_list[2]="log/file.log";
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$tar_object->add($v_list);
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// ----- Adding more files
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$tar_object->add("release/newfile.log release/readme.txt");
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// ----- Listing the content
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if (($v_list = $tar_object->listContent()) != 0)
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for ($i=0; $i<sizeof($v_list); $i++)
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{
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echo "Filename :'".$v_list[$i][filename]."'<br>";
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echo " .size :'".$v_list[$i][size]."'<br>";
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echo " .mtime :'".$v_list[$i][mtime]."' (".date("l dS of F Y h:i:s A", $v_list[$i][mtime]).")<br>";
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echo " .mode :'".$v_list[$i][mode]."'<br>";
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echo " .uid :'".$v_list[$i][uid]."'<br>";
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echo " .gid :'".$v_list[$i][gid]."'<br>";
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echo " .typeflag :'".$v_list[$i][typeflag]."'<br>";
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}
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// ----- Extracting the archive in directory "install"
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$tar_object->extract("install");
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Public arguments :
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------------------
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None
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Public Methods :
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----------------
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Method : Archive_Tar($p_tarname, $compress = false)
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Description :
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Archive_Tar Class constructor. This flavour of the constructor only
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declare a new Archive_Tar object, identifying it by the name of the
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tar file.
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If the compress argument is set the tar will be read or created as a
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gzip compressed TAR file.
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Arguments :
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$p_tarname : A valid filename for the tar archive file.
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$p_compress : true/false. Indicate if the archive need to be
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compressed or not.
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Return value :
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The Archive_Tar object.
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Sample :
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object_compressed = new Archive_Tar("tarname.tgz", true);
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How it works :
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Initialize the object.
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Method : create($p_filelist)
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Description :
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This method creates the archive file and add the files / directories
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that are listed in $p_filelist.
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If the file already exists and is writable, it is replaced by the
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new tar. It is a create and not an add. If the file exists and is
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read-only or is a directory it is not replaced. The method return
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false and a PEAR error text.
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The $p_filelist parameter can be an array of string, each string
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representing a filename or a directory name with their path if
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needed. It can also be a single string with names separated by a
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single blank.
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See also createModify() method for more details.
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Arguments :
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$p_filelist : An array of filenames and directory names, or a single
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string with names separated by a single blank space.
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Return value :
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true on success, false on error.
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Sample 1 :
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->setErrorHandling(PEAR_ERROR_PRINT); // Optional error handling
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$v_list[0]="file.txt";
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$v_list[1]="data/"; (Optional '/' at the end)
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$v_list[2]="file.log";
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$tar_object->create($v_list);
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Sample 2 :
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->setErrorHandling(PEAR_ERROR_PRINT); // Optional error handling
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$tar_object->create("file.txt data/ file.log");
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How it works :
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Just calling the createModify() method with the right parameters.
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Method : createModify($p_filelist, $p_add_dir, $p_remove_dir = "")
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Description :
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This method creates the archive file and add the files / directories
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that are listed in $p_filelist.
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If the file already exists and is writable, it is replaced by the
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new tar. It is a create and not an add. If the file exists and is
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read-only or is a directory it is not replaced. The method return
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false and a PEAR error text.
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The $p_filelist parameter can be an array of string, each string
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representing a filename or a directory name with their path if
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needed. It can also be a single string with names separated by a
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single blank.
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The path indicated in $p_remove_dir will be removed from the
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memorized path of each file / directory listed when this path
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exists. By default nothing is removed (empty path "")
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The path indicated in $p_add_dir will be added at the beginning of
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the memorized path of each file / directory listed. However it can
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be set to empty "". The adding of a path is done after the removing
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of path.
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The path add/remove ability enables the user to prepare an archive
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for extraction in a different path than the origin files are.
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See also addModify() method for file adding properties.
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Arguments :
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$p_filelist : An array of filenames and directory names, or a single
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string with names separated by a single blank space.
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$p_add_dir : A string which contains a path to be added to the
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memorized path of each element in the list.
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$p_remove_dir : A string which contains a path to be removed from
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the memorized path of each element in the list, when
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relevant.
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Return value :
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true on success, false on error.
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Sample 1 :
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->setErrorHandling(PEAR_ERROR_PRINT); // Optional error handling
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$v_list[0]="file.txt";
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$v_list[1]="data/"; (Optional '/' at the end)
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$v_list[2]="file.log";
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$tar_object->createModify($v_list, "install");
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// files are stored in the archive as :
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// install/file.txt
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// install/data
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// install/data/file1.txt
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// install/data/... all the files and sub-dirs of data/
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// install/file.log
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Sample 2 :
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->setErrorHandling(PEAR_ERROR_PRINT); // Optional error handling
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$v_list[0]="dev/file.txt";
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$v_list[1]="dev/data/"; (Optional '/' at the end)
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$v_list[2]="log/file.log";
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$tar_object->createModify($v_list, "install", "dev");
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// files are stored in the archive as :
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// install/file.txt
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// install/data
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// install/data/file1.txt
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// install/data/... all the files and sub-dirs of data/
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// install/log/file.log
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How it works :
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Open the file in write mode (erasing the existing one if one),
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call the _addList() method for adding the files in an empty archive,
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add the tar footer (512 bytes block), close the tar file.
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Method : addModify($p_filelist, $p_add_dir, $p_remove_dir="")
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Description :
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This method add the files / directories listed in $p_filelist at the
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end of the existing archive. If the archive does not yet exists it
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is created.
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The $p_filelist parameter can be an array of string, each string
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representing a filename or a directory name with their path if
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needed. It can also be a single string with names separated by a
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single blank.
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The path indicated in $p_remove_dir will be removed from the
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memorized path of each file / directory listed when this path
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exists. By default nothing is removed (empty path "")
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The path indicated in $p_add_dir will be added at the beginning of
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the memorized path of each file / directory listed. However it can
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be set to empty "". The adding of a path is done after the removing
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of path.
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The path add/remove ability enables the user to prepare an archive
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for extraction in a different path than the origin files are.
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If a file/dir is already in the archive it will only be added at the
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end of the archive. There is no update of the existing archived
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file/dir. However while extracting the archive, the last file will
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replace the first one. This results in a none optimization of the
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archive size.
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If a file/dir does not exist the file/dir is ignored. However an
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error text is send to PEAR error.
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If a file/dir is not readable the file/dir is ignored. However an
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error text is send to PEAR error.
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If the resulting filename/dirname (after the add/remove option or
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not) string is greater than 99 char, the file/dir is
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ignored. However an error text is send to PEAR error.
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Arguments :
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$p_filelist : An array of filenames and directory names, or a single
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string with names separated by a single blank space.
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$p_add_dir : A string which contains a path to be added to the
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memorized path of each element in the list.
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$p_remove_dir : A string which contains a path to be removed from
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the memorized path of each element in the list, when
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relevant.
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Return value :
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true on success, false on error.
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Sample 1 :
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$tar_object = new Archive_Tar("tarname.tar");
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[...]
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$v_list[0]="dev/file.txt";
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$v_list[1]="dev/data/"; (Optional '/' at the end)
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$v_list[2]="log/file.log";
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$tar_object->addModify($v_list, "install");
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// files are stored in the archive as :
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// install/file.txt
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// install/data
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// install/data/file1.txt
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// install/data/... all the files and sub-dirs of data/
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// install/file.log
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Sample 2 :
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$tar_object = new Archive_Tar("tarname.tar");
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[...]
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$v_list[0]="dev/file.txt";
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$v_list[1]="dev/data/"; (Optional '/' at the end)
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$v_list[2]="log/file.log";
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$tar_object->addModify($v_list, "install", "dev");
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// files are stored in the archive as :
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// install/file.txt
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// install/data
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// install/data/file1.txt
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// install/data/... all the files and sub-dirs of data/
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// install/log/file.log
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How it works :
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If the archive does not exists it create it and add the files.
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If the archive does exists and is not compressed, it open it, jump
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before the last empty 512 bytes block (tar footer) and add the files
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at this point.
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If the archive does exists and is compressed, a temporary copy file
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is created. This temporary file is then 'gzip' read block by block
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until the last empty block. The new files are then added in the
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compressed file.
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The adding of files is done by going through the file/dir list,
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adding files per files, in a recursive way through the
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directory. Each time a path need to be added/removed it is done
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before writing the file header in the archive.
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Method : add($p_filelist)
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Description :
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This method add the files / directories listed in $p_filelist at the
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end of the existing archive. If the archive does not yet exists it
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is created.
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The $p_filelist parameter can be an array of string, each string
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representing a filename or a directory name with their path if
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needed. It can also be a single string with names separated by a
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single blank.
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See addModify() method for details and limitations.
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Arguments :
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$p_filelist : An array of filenames and directory names, or a single
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string with names separated by a single blank space.
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Return value :
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true on success, false on error.
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Sample 1 :
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$tar_object = new Archive_Tar("tarname.tar");
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[...]
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$v_list[0]="dev/file.txt";
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$v_list[1]="dev/data/"; (Optional '/' at the end)
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$v_list[2]="log/file.log";
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$tar_object->add($v_list);
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Sample 2 :
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$tar_object = new Archive_Tar("tarname.tgz", true);
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[...]
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$v_list[0]="dev/file.txt";
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$v_list[1]="dev/data/"; (Optional '/' at the end)
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$v_list[2]="log/file.log";
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$tar_object->add($v_list);
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How it works :
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Simply call the addModify() method with the right parameters.
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Method : extract($p_path = "")
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Description :
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This method extract all the content of the archive in the directory
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indicated by $p_path.If $p_path is optional, if not set the archive
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is extracted in the current directory.
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While extracting a file, if the directory path does not exists it is
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created.
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See extractModify() for details and limitations.
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Arguments :
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$p_path : Optional path where the files/dir need to by extracted.
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Return value :
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true on success, false on error.
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Sample :
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->extract();
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How it works :
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Simply call the extractModify() method with appropriate parameters.
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Method : extractModify($p_path, $p_remove_path)
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Description :
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This method extract all the content of the archive in the directory
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indicated by $p_path. When relevant the memorized path of the
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files/dir can be modified by removing the $p_remove_path path at the
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beginning of the file/dir path.
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While extracting a file, if the directory path does not exists it is
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created.
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While extracting a file, if the file already exists it is replaced
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without looking for last modification date.
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While extracting a file, if the file already exists and is write
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protected, the extraction is aborted.
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While extracting a file, if a directory with the same name already
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exists, the extraction is aborted.
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While extracting a directory, if a file with the same name already
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exists, the extraction is aborted.
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While extracting a file/directory if the destination directory exist
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and is write protected, or does not exist but can not be created,
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the extraction is aborted.
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If after extraction an extracted file does not show the correct
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stored file size, the extraction is aborted.
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When the extraction is aborted, a PEAR error text is set and false
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is returned. However the result can be a partial extraction that may
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need to be manually cleaned.
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Arguments :
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$p_path : The path of the directory where the files/dir need to by
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extracted.
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$p_remove_path : Part of the memorized path that can be removed if
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present at the beginning of the file/dir path.
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Return value :
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true on success, false on error.
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Sample :
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// Imagine tarname.tar with files :
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// dev/data/file.txt
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// dev/data/log.txt
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// readme.txt
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->extractModify("install", "dev");
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// Files will be extracted there :
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// install/data/file.txt
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// install/data/log.txt
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// install/readme.txt
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How it works :
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Open the archive and call a more generic function that can extract
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only a part of the archive or all the archive.
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See extractList() method for more details.
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Method : listContent()
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Description :
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This method returns an array of arrays that describe each
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file/directory present in the archive.
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The array is not sorted, so it show the position of the file in the
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archive.
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The file informations are :
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$file[filename] : Name and path of the file/dir.
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$file[mode] : File permissions (result of fileperms())
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$file[uid] : user id
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$file[gid] : group id
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$file[size] : filesize
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$file[mtime] : Last modification time (result of filemtime())
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$file[typeflag] : "" for file, "5" for directory
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Arguments :
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Return value :
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An array of arrays or 0 on error.
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Sample :
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$tar_object = new Archive_Tar("tarname.tar");
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if (($v_list = $tar_object->listContent()) != 0)
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for ($i=0; $i<sizeof($v_list); $i++)
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{
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echo "Filename :'".$v_list[$i][filename]."'<br>";
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echo " .size :'".$v_list[$i][size]."'<br>";
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echo " .mtime :'".$v_list[$i][mtime]."' (".
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date("l dS of F Y h:i:s A", $v_list[$i][mtime]).")<br>";
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echo " .mode :'".$v_list[$i][mode]."'<br>";
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echo " .uid :'".$v_list[$i][uid]."'<br>";
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echo " .gid :'".$v_list[$i][gid]."'<br>";
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echo " .typeflag :'".$v_list[$i][typeflag]."'<br>";
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}
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How it works :
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Call the same function as an extract however with a flag to only go
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through the archive without extracting the files.
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Method : extractList($p_filelist, $p_path = "", $p_remove_path = "")
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Description :
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This method extract from the archive only the files indicated in the
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$p_filelist. These files are extracted in the current directory or
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in the directory indicated by the optional $p_path parameter.
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If indicated the $p_remove_path can be used in the same way as it is
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used in extractModify() method.
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Arguments :
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$p_filelist : An array of filenames and directory names, or a single
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string with names separated by a single blank space.
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$p_path : The path of the directory where the files/dir need to by
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extracted.
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$p_remove_path : Part of the memorized path that can be removed if
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present at the beginning of the file/dir path.
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Return value :
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true on success, false on error.
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Sample :
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// Imagine tarname.tar with files :
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// dev/data/file.txt
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// dev/data/log.txt
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// readme.txt
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$tar_object = new Archive_Tar("tarname.tar");
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$tar_object->extractList("dev/data/file.txt readme.txt", "install",
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"dev");
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// Files will be extracted there :
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// install/data/file.txt
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// install/readme.txt
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How it works :
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Go through the archive and extract only the files present in the
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list.
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