93 lines
2.9 KiB
Plaintext
93 lines
2.9 KiB
Plaintext
;; @module zlib.lsp
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;; @description Functions for compression/decompression with zlib
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;; @version 1.1 - comments redone for automatic documentation
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;; @version 1.2 - new library detection routine
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;; @version 1.3 - added lib for opnBSD and tested for 64-bit newLISP
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;; @version 1.4 - doc changes
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;; @version 1.5 - replaced <tt>write-buffer</tt> with <tt>write</tt>
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;; @version 1.6 - removed broken <tt>squeeze</tt> and <tt>unsqueeze</tt> functions.
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;; @version 1.7 - added library for CentOS 6 Linux
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;; @version 1.71 - added library for Ubuntu Linux 12.04 and 13.04
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;; @version 1.72 - swap else-less 'if' for 'when'
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;; @version 1.73 changes references to /usr/ to /usr/local/
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;; @author L.M 2006-2013
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;; <h3>Functions for compression/decompression with zlib</h3>
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;; For this module a platform sepcific library
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;; from @link http://www.zlib.net/ www.zib.net is needed.
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;;
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;; The module offers two compression/decompression support as
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;; GZ compatible file compression and decompression.
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;;
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;; Before using the module it must be loaded:
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;; <pre>
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;; (load "/usr/local/share/newlisp/modules/zlib.lsp")
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;; ; or shorter
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;; (module "zlib.lsp")
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;; </pre>
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(when (< (sys-info -2) 10110)
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(constant (global 'write) write-buffer))
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(context 'zlib)
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(set 'files '(
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"/lib/i386-linux-gnu/libz.so.1" ; Ubuntu 13.04
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"/usr/lib/x86_64-linux-gnu/libz.so" ; Ubuntu 12.04 LTS
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"/usr/lib/libz.so" ; Linux, BSD, Solaris
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"/usr/lib/libz.so.4.1" ; OpenBSD 4.6
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"/usr/lib64/libz.so" ; for 64Bit CentOS 6 Linux
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"/usr/lib/libz.dylib" ; Mac OSX / Darwin
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"libz1.dll" ; MS Windows
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))
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(set 'library (files (or
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(find true (map file? files))
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(throw-error "cannot find zlib compression library"))))
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(import library "compress")
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(import library "uncompress")
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(import library "gzopen")
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(import library "gzread")
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(import library "gzclose")
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(import library "gzwrite")
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;; @syntax (zlib:gz-read-file <str-file-name>)
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;; @return A string buffer with the original contents.
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;;
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;; Uncompresses the GZ compressed file in <str-file-name>.
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;; @example
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;; (set 'buff (zlib:gz-read-file "myfile.gz"))
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(define (gz-read-file file-name)
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(let ( (fno (gzopen file-name "rb"))
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(buff (dup "\000" 0x1000))
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(result ""))
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(when (!= fno 0)
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(while (> (set 'bytes (gzread fno buff 0x1000)) 0)
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(write result buff bytes))
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(gzclose fno)
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result)
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))
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;; @syntax (zlib:gz-write-file <str-file-name> <str-buffer>)
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;; @return The number of bytes in <str-buffer>.
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;;
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;; Does a GZ compatible comrpression of a buffer in <str-buffer> and
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;; writes it to the file in <str-file-name>.
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;; @example
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;; (zlib:gz-write-file "myfile.gz" buff)
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(define (gz-write-file file-name buff)
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(let ( (fno (gzopen file-name "wb"))
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(result nil))
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(when (!= fno 0)
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(set 'result (gzwrite fno buff (length buff)))
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(gzclose fno)
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result)
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))
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(context MAIN)
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; eof
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