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NAME |
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Convert::UUlib - Perl interface to the uulib library (a.k.a. |
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uudeview/uuenview). |
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|
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SYNOPSIS |
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use Convert::UUlib ':all'; |
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|
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# read all the files named on the commandline and decode them |
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# into the CURRENT directory. See below for a longer example. |
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LoadFile $_ for @ARGV; |
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for (my $i = 0; my $uu = GetFileListItem $i; $i++) { |
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if ($uu->state & FILE_OK) { |
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$uu->decode; |
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print $uu->filename, "\n"; |
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} |
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} |
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|
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DESCRIPTION |
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Read the file doc/library.pdf from the distribution for in-depth |
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information about the C-library used in this interface, and the rest of |
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this document and especially the non-trivial decoder program at the end. |
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|
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EXPORTED CONSTANTS |
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Action code constants |
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ACT_IDLE we don't do anything |
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ACT_SCANNING scanning an input file |
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ACT_DECODING decoding into a temp file |
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ACT_COPYING copying temp to target |
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ACT_ENCODING encoding a file |
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|
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Message severity levels |
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MSG_MESSAGE just a message, nothing important |
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MSG_NOTE something that should be noticed |
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MSG_WARNING important msg, processing continues |
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MSG_ERROR processing has been terminated |
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MSG_FATAL decoder cannot process further requests |
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MSG_PANIC recovery impossible, app must terminate |
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|
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Options |
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OPT_VERSION version number MAJOR.MINORplPATCH (ro) |
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OPT_FAST assumes only one part per file |
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OPT_DUMBNESS switch off the program's intelligence |
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OPT_BRACKPOL give numbers in [] higher precendence |
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OPT_VERBOSE generate informative messages |
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OPT_DESPERATE try to decode incomplete files |
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OPT_IGNREPLY ignore RE:plies (off by default) |
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OPT_OVERWRITE whether it's OK to overwrite ex. files |
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OPT_SAVEPATH prefix to save-files on disk |
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OPT_IGNMODE ignore the original file mode |
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OPT_DEBUG print messages with FILE/LINE info |
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OPT_ERRNO get last error code for RET_IOERR (ro) |
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OPT_PROGRESS retrieve progress information |
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OPT_USETEXT handle text messages |
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OPT_PREAMB handle Mime preambles/epilogues |
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OPT_TINYB64 detect short B64 outside of Mime |
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OPT_ENCEXT extension for single-part encoded files |
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OPT_REMOVE remove input files after decoding (dangerous) |
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OPT_MOREMIME strict MIME adherence |
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OPT_DOTDOT ".."-unescaping has not yet been done on input files |
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|
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Result/Error codes |
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RET_OK everything went fine |
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RET_IOERR I/O Error - examine errno |
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RET_NOMEM not enough memory |
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RET_ILLVAL illegal value for operation |
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RET_NODATA decoder didn't find any data |
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RET_NOEND encoded data wasn't ended properly |
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RET_UNSUP unsupported function (encoding) |
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RET_EXISTS file exists (decoding) |
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RET_CONT continue -- special from ScanPart |
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RET_CANCEL operation canceled |
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|
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File States |
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This code is zero, i.e. "false": |
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|
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UUFILE_READ Read in, but not further processed |
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|
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The following state codes are or'ed together: |
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|
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FILE_MISPART Missing Part(s) detected |
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FILE_NOBEGIN No 'begin' found |
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FILE_NOEND No 'end' found |
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FILE_NODATA File does not contain valid uudata |
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FILE_OK All Parts found, ready to decode |
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FILE_ERROR Error while decoding |
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FILE_DECODED Successfully decoded |
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FILE_TMPFILE Temporary decoded file exists |
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|
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Encoding types |
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UU_ENCODED UUencoded data |
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B64_ENCODED Mime-Base64 data |
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XX_ENCODED XXencoded data |
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BH_ENCODED Binhex encoded |
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PT_ENCODED Plain-Text encoded (MIME) |
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QP_ENCODED Quoted-Printable (MIME) |
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YENC_ENCODED yEnc encoded (non-MIME) |
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|
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EXPORTED FUNCTIONS |
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Initializing and cleanup |
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Initialize is automatically called when the module is loaded and |
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allocates quite a small amount of memory for todays machines ;) CleanUp |
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releases that again. |
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|
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On my machine, a fairly complete decode with DBI backend needs about |
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10MB RSS to decode 20000 files. |
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|
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Initialize |
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Not normally necessary, (re-)initializes the library. |
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|
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CleanUp |
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Not normally necessary, could be called at the end to release memory |
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before starting a new decoding round. |
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|
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Setting and querying options |
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$option = GetOption OPT_xxx |
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SetOption OPT_xxx, opt-value |
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|
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See the "OPT_xxx" constants above to see which options exist. |
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|
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Setting various callbacks |
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SetMsgCallback [callback-function] |
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SetBusyCallback [callback-function] |
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SetFileCallback [callback-function] |
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SetFNameFilter [callback-function] |
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|
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Call the currently selected FNameFilter |
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$file = FNameFilter $file |
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|
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Loading sourcefiles, optionally fuzzy merge and start decoding |
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($retval, $count) = LoadFile $fname, [$id, [$delflag, [$partno]]] |
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Load the given file and scan it for encoded contents. Optionally tag |
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it with the given id, and if $delflag is true, delete the file after |
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it is no longer necessary. If you are certain of the part number, |
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you can specify it as the last argument. |
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|
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A better (usually faster) way of doing this is using the |
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"SetFNameFilter" functionality. |
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|
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$retval = Smerge $pass |
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If you are desperate, try to call "Smerge" with increasing $pass |
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values, beginning at 0, to try to merge parts that usually would not |
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have been merged. |
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|
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Most probably this will result in garbled files, so never do this by |
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default. |
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|
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$item = GetFileListItem $item_number |
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Return the $item structure for the $item_number'th found file, or |
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"undef" of no file with that number exists. |
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|
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The first file has number 0, and the series has no holes, so you can |
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iterate over all files by starting with zero and incrementing until |
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you hit "undef". |
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|
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Decoding files |
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$retval = $item->rename($newname) |
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Change the ondisk filename where the decoded file will be saved. |
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|
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$retval = $item->decode_temp |
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Decode the file into a temporary location, use "$item->infile" to |
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retrieve the temporary filename. |
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|
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$retval = $item->remove_temp |
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Remove the temporarily decoded file again. |
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|
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$retval = $item->decode([$target_path]) |
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Decode the file to it's destination, or the given target path. |
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|
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$retval = $item->info(callback-function) |
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|
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Querying (and setting) item attributes |
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$state = $item->state |
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$mode = $item->mode([newmode]) |
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$uudet = $item->uudet |
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$size = $item->size |
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$filename = $item->filename([newfilename}) |
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$subfname = $item->subfname |
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$mimeid = $item->mimeid |
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$mimetype = $item->mimetype |
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$binfile = $item->binfile |
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|
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Information about source parts |
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$parts = $item->parts |
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Return information about all parts (source files) used to decode the |
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file as a list of hashrefs with the following structure: |
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|
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{ |
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partno => <integer describing the part number, starting with 1>, |
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# the following member sonly exist when they contain useful information |
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sfname => <local pathname of the file where this part is from>, |
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filename => <the ondisk filename of the decoded file>, |
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subfname => <used to cluster postings, possibly the posting filename>, |
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subject => <the subject of the posting/mail>, |
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origin => <the possible source (From) address>, |
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mimetype => <the possible mimetype of the decoded file>, |
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mimeid => <the id part of the Content-Type>, |
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} |
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|
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Usually you are interested mostly the "sfname" and possibly the |
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"partno" and "filename" members. |
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|
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Functions below not documented and not very well tested |
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QuickDecode |
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EncodeMulti |
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EncodePartial |
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EncodeToStream |
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EncodeToFile |
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E_PrepSingle |
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E_PrepPartial |
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|
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EXTENSION FUNCTIONS |
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Functions found in this module but not documented in the uulib |
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documentation: |
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|
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$msg = straction ACT_xxx |
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Return a human readable string representing the given action code. |
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|
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$msg = strerror RET_xxx |
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Return a human readable string representing the given error code. |
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|
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$str = strencoding xxx_ENCODED |
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Return the name of the encoding type as a string. |
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|
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$str = strmsglevel MSG_xxx |
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Returns the message level as a string. |
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|
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SetFileNameCallback $cb |
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Sets (or queries) the FileNameCallback, which is called whenever the |
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decoding library can't find a filename and wants to extract a |
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filename from the subject line of a posting. The callback will be |
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called with two arguments, the subject line and the current |
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candidate for the filename. The latter argument can be "undef", |
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which means that no filename could be found (and likely no one |
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exists, so it is safe to also return "undef" in this case). If it |
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doesn't return anything (not even "undef"!), then nothing happens, |
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so this is a no-op callback: |
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|
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sub cb { |
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return (); |
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} |
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|
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If it returns "undef", then this indicates that no filename could be |
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found. In all other cases, the return value is taken to be the |
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filename. |
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|
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This is a slightly more useful callback: |
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|
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sub cb { |
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return unless $_[1]; # skip "Re:"-plies et al. |
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my ($subject, $filename) = @_; |
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# if we find some *.rar, take it |
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return $1 if $subject =~ /(\w+\.rar)/; |
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# otherwise just pass what we have |
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return (); |
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} |
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|
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LARGE EXAMPLE DECODER |
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This is the file "example-decoder" from the distribution, put here |
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instead of more thorough documentation. |
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|
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# decode all the files in the directory uusrc/ and copy |
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# the resulting files to uudst/ |
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|
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use Convert::UUlib ':all'; |
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|
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sub namefilter { |
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my($path)=@_; |
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$path=~s/^.*[\/\\]//; |
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$path; |
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} |
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|
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sub busycb { |
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my ($action, $curfile, $partno, $numparts, $percent, $fsize) = @_; |
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$_[0]=straction($action); |
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print "busy_callback(", (join ",",@_), ")\n"; |
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0; |
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} |
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|
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SetOption OPT_IGNMODE, 1; |
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SetOption OPT_VERBOSE, 1; |
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|
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# show the three ways you can set callback functions. I normally |
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# prefer the one with the sub inplace. |
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SetFNameFilter \&namefilter; |
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|
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SetBusyCallback "busycb", 333; |
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|
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SetMsgCallback sub { |
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my ($msg, $level) = @_; |
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print uc strmsglevel $_[1], ": $msg\n"; |
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}; |
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|
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# the following non-trivial FileNameCallback takes care |
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# of some subject lines not detected properly by uulib: |
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SetFileNameCallback sub { |
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return unless $_[1]; # skip "Re:"-plies et al. |
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local $_ = $_[0]; |
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|
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# the following rules are rather effective on some newsgroups, |
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# like alt.binaries.games.anime, where non-mime, uuencoded data |
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# is very common |
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|
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# if we find some *.rar, take it as the filename |
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return $1 if /(\S{3,}\.(?:[rstuvwxyz]\d\d|rar))\s/i; |
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|
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# one common subject format |
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return $1 if /- "(.{2,}?\..+?)" (?:yenc )?\(\d+\/\d+\)/i; |
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|
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# - filename.par (04/55) |
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return $1 if /- "?(\S{3,}\.\S+?)"? (?:yenc )?\(\d+\/\d+\)/i; |
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|
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# - (xxx) No. 1 sayuri81.jpg 756565 bytes |
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# - (20 files) No.17 Roseanne.jpg [2/2] |
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return $1 if /No\.[ 0-9]+ (\S+\....) (?:\d+ bytes )?\[/; |
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|
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# otherwise just pass what we have |
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return (); |
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}; |
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|
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# now read all files in the directory uusrc/* |
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for(<uusrc/*>) { |
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my($retval,$count)=LoadFile ($_, $_, 1); |
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print "file($_), status(", strerror $retval, ") parts($count)\n"; |
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} |
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|
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SetOption OPT_SAVEPATH, "uudst/"; |
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|
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# now wade through all files and their source parts |
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$i = 0; |
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while ($uu = GetFileListItem($i)) { |
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$i++; |
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print "file nr. $i"; |
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print " state ", $uu->state; |
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print " mode ", $uu->mode; |
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print " uudet ", strencoding $uu->uudet; |
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print " size ", $uu->size; |
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print " filename ", $uu->filename; |
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print " subfname ", $uu->subfname; |
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print " mimeid ", $uu->mimeid; |
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print " mimetype ", $uu->mimetype; |
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print "\n"; |
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|
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# print additional info about all parts |
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for ($uu->parts) { |
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while (my ($k, $v) = each %$_) { |
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print "$k > $v, "; |
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} |
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print "\n"; |
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} |
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|
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$uu->decode_temp; |
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print " temporarily decoded to ", $uu->binfile, "\n"; |
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$uu->remove_temp; |
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|
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print strerror $uu->decode; |
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print " saved as uudst/", $uu->filename, "\n"; |
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} |
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|
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print "cleanup...\n"; |
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|
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CleanUp(); |
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|
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AUTHOR |
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Marc Lehmann <schmorp@schmorp.de>, the original uulib library was |
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written by Frank Pilhofer <fp@informatik.uni-frankfurt.de>, and later |
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heavily bugfixed by Marc Lehmann. |
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|
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SEE ALSO |
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perl(1), uudeview homepage at http://www.uni-frankfurt.de/~fp/uudeview/. |
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|
