diff options
Diffstat (limited to 'lib/jython/Lib/binhex.py')
| -rw-r--r-- | lib/jython/Lib/binhex.py | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/lib/jython/Lib/binhex.py b/lib/jython/Lib/binhex.py new file mode 100644 index 000000000..81bb1e30e --- /dev/null +++ b/lib/jython/Lib/binhex.py @@ -0,0 +1,531 @@ +"""Macintosh binhex compression/decompression.
+
+easy interface:
+binhex(inputfilename, outputfilename)
+hexbin(inputfilename, outputfilename)
+"""
+
+#
+# Jack Jansen, CWI, August 1995.
+#
+# The module is supposed to be as compatible as possible. Especially the
+# easy interface should work "as expected" on any platform.
+# XXXX Note: currently, textfiles appear in mac-form on all platforms.
+# We seem to lack a simple character-translate in python.
+# (we should probably use ISO-Latin-1 on all but the mac platform).
+# XXXX The simple routines are too simple: they expect to hold the complete
+# files in-core. Should be fixed.
+# XXXX It would be nice to handle AppleDouble format on unix
+# (for servers serving macs).
+# XXXX I don't understand what happens when you get 0x90 times the same byte on
+# input. The resulting code (xx 90 90) would appear to be interpreted as an
+# escaped *value* of 0x90. All coders I've seen appear to ignore this nicety...
+#
+import sys
+import os
+import struct
+import binascii
+
+__all__ = ["binhex","hexbin","Error"]
+
+class Error(Exception):
+ pass
+
+# States (what have we written)
+[_DID_HEADER, _DID_DATA, _DID_RSRC] = range(3)
+
+# Various constants
+REASONABLY_LARGE=32768 # Minimal amount we pass the rle-coder
+LINELEN=64
+RUNCHAR=chr(0x90) # run-length introducer
+
+#
+# This code is no longer byte-order dependent
+
+#
+# Workarounds for non-mac machines.
+if os.name == 'mac':
+ import macfs
+ import MacOS
+ try:
+ openrf = MacOS.openrf
+ except AttributeError:
+ # Backward compatibility
+ openrf = open
+
+ def FInfo():
+ return macfs.FInfo()
+
+ def getfileinfo(name):
+ finfo = macfs.FSSpec(name).GetFInfo()
+ dir, file = os.path.split(name)
+ # XXXX Get resource/data sizes
+ fp = open(name, 'rb')
+ fp.seek(0, 2)
+ dlen = fp.tell()
+ fp = openrf(name, '*rb')
+ fp.seek(0, 2)
+ rlen = fp.tell()
+ return file, finfo, dlen, rlen
+
+ def openrsrc(name, *mode):
+ if not mode:
+ mode = '*rb'
+ else:
+ mode = '*' + mode[0]
+ return openrf(name, mode)
+
+else:
+ #
+ # Glue code for non-macintosh usage
+ #
+
+ class FInfo:
+ def __init__(self):
+ self.Type = '????'
+ self.Creator = '????'
+ self.Flags = 0
+
+ def getfileinfo(name):
+ finfo = FInfo()
+ # Quick check for textfile
+ fp = open(name)
+ data = open(name).read(256)
+ for c in data:
+ if not c.isspace() and (c<' ' or ord(c) > 0177):
+ break
+ else:
+ finfo.Type = 'TEXT'
+ fp.seek(0, 2)
+ dsize = fp.tell()
+ fp.close()
+ dir, file = os.path.split(name)
+ file = file.replace(':', '-', 1)
+ return file, finfo, dsize, 0
+
+ class openrsrc:
+ def __init__(self, *args):
+ pass
+
+ def read(self, *args):
+ return ''
+
+ def write(self, *args):
+ pass
+
+ def close(self):
+ pass
+
+class _Hqxcoderengine:
+ """Write data to the coder in 3-byte chunks"""
+
+ def __init__(self, ofp):
+ self.ofp = ofp
+ self.data = ''
+ self.hqxdata = ''
+ self.linelen = LINELEN-1
+
+ def write(self, data):
+ self.data = self.data + data
+ datalen = len(self.data)
+ todo = (datalen/3)*3
+ data = self.data[:todo]
+ self.data = self.data[todo:]
+ if not data:
+ return
+ self.hqxdata = self.hqxdata + binascii.b2a_hqx(data)
+ self._flush(0)
+
+ def _flush(self, force):
+ first = 0
+ while first <= len(self.hqxdata)-self.linelen:
+ last = first + self.linelen
+ self.ofp.write(self.hqxdata[first:last]+'\n')
+ self.linelen = LINELEN
+ first = last
+ self.hqxdata = self.hqxdata[first:]
+ if force:
+ self.ofp.write(self.hqxdata + ':\n')
+
+ def close(self):
+ if self.data:
+ self.hqxdata = \
+ self.hqxdata + binascii.b2a_hqx(self.data)
+ self._flush(1)
+ self.ofp.close()
+ del self.ofp
+
+class _Rlecoderengine:
+ """Write data to the RLE-coder in suitably large chunks"""
+
+ def __init__(self, ofp):
+ self.ofp = ofp
+ self.data = ''
+
+ def write(self, data):
+ self.data = self.data + data
+ if len(self.data) < REASONABLY_LARGE:
+ return
+ rledata = binascii.rlecode_hqx(self.data)
+ self.ofp.write(rledata)
+ self.data = ''
+
+ def close(self):
+ if self.data:
+ rledata = binascii.rlecode_hqx(self.data)
+ self.ofp.write(rledata)
+ self.ofp.close()
+ del self.ofp
+
+class BinHex:
+ def __init__(self, (name, finfo, dlen, rlen), ofp):
+ if type(ofp) == type(''):
+ ofname = ofp
+ ofp = open(ofname, 'w')
+ if os.name == 'mac':
+ fss = macfs.FSSpec(ofname)
+ fss.SetCreatorType('BnHq', 'TEXT')
+ ofp.write('(This file must be converted with BinHex 4.0)\n\n:')
+ hqxer = _Hqxcoderengine(ofp)
+ self.ofp = _Rlecoderengine(hqxer)
+ self.crc = 0
+ if finfo is None:
+ finfo = FInfo()
+ self.dlen = dlen
+ self.rlen = rlen
+ self._writeinfo(name, finfo)
+ self.state = _DID_HEADER
+
+ def _writeinfo(self, name, finfo):
+ name = name
+ nl = len(name)
+ if nl > 63:
+ raise Error, 'Filename too long'
+ d = chr(nl) + name + '\0'
+ d2 = finfo.Type + finfo.Creator
+
+ # Force all structs to be packed with big-endian
+ d3 = struct.pack('>h', finfo.Flags)
+ d4 = struct.pack('>ii', self.dlen, self.rlen)
+ info = d + d2 + d3 + d4
+ self._write(info)
+ self._writecrc()
+
+ def _write(self, data):
+ self.crc = binascii.crc_hqx(data, self.crc)
+ self.ofp.write(data)
+
+ def _writecrc(self):
+ # XXXX Should this be here??
+ # self.crc = binascii.crc_hqx('\0\0', self.crc)
+ self.ofp.write(struct.pack('>h', self.crc))
+ self.crc = 0
+
+ def write(self, data):
+ if self.state != _DID_HEADER:
+ raise Error, 'Writing data at the wrong time'
+ self.dlen = self.dlen - len(data)
+ self._write(data)
+
+ def close_data(self):
+ if self.dlen != 0:
+ raise Error, 'Incorrect data size, diff='+`self.rlen`
+ self._writecrc()
+ self.state = _DID_DATA
+
+ def write_rsrc(self, data):
+ if self.state < _DID_DATA:
+ self.close_data()
+ if self.state != _DID_DATA:
+ raise Error, 'Writing resource data at the wrong time'
+ self.rlen = self.rlen - len(data)
+ self._write(data)
+
+ def close(self):
+ if self.state < _DID_DATA:
+ self.close_data()
+ if self.state != _DID_DATA:
+ raise Error, 'Close at the wrong time'
+ if self.rlen != 0:
+ raise Error, \
+ "Incorrect resource-datasize, diff="+`self.rlen`
+ self._writecrc()
+ self.ofp.close()
+ self.state = None
+ del self.ofp
+
+def binhex(inp, out):
+ """(infilename, outfilename) - Create binhex-encoded copy of a file"""
+ finfo = getfileinfo(inp)
+ ofp = BinHex(finfo, out)
+
+ ifp = open(inp, 'rb')
+ # XXXX Do textfile translation on non-mac systems
+ while 1:
+ d = ifp.read(128000)
+ if not d: break
+ ofp.write(d)
+ ofp.close_data()
+ ifp.close()
+
+ ifp = openrsrc(inp, 'rb')
+ while 1:
+ d = ifp.read(128000)
+ if not d: break
+ ofp.write_rsrc(d)
+ ofp.close()
+ ifp.close()
+
+class _Hqxdecoderengine:
+ """Read data via the decoder in 4-byte chunks"""
+
+ def __init__(self, ifp):
+ self.ifp = ifp
+ self.eof = 0
+
+ def read(self, totalwtd):
+ """Read at least wtd bytes (or until EOF)"""
+ decdata = ''
+ wtd = totalwtd
+ #
+ # The loop here is convoluted, since we don't really now how
+ # much to decode: there may be newlines in the incoming data.
+ while wtd > 0:
+ if self.eof: return decdata
+ wtd = ((wtd+2)/3)*4
+ data = self.ifp.read(wtd)
+ #
+ # Next problem: there may not be a complete number of
+ # bytes in what we pass to a2b. Solve by yet another
+ # loop.
+ #
+ while 1:
+ try:
+ decdatacur, self.eof = \
+ binascii.a2b_hqx(data)
+ break
+ except binascii.Incomplete:
+ pass
+ newdata = self.ifp.read(1)
+ if not newdata:
+ raise Error, \
+ 'Premature EOF on binhex file'
+ data = data + newdata
+ decdata = decdata + decdatacur
+ wtd = totalwtd - len(decdata)
+ if not decdata and not self.eof:
+ raise Error, 'Premature EOF on binhex file'
+ return decdata
+
+ def close(self):
+ self.ifp.close()
+
+class _Rledecoderengine:
+ """Read data via the RLE-coder"""
+
+ def __init__(self, ifp):
+ self.ifp = ifp
+ self.pre_buffer = ''
+ self.post_buffer = ''
+ self.eof = 0
+
+ def read(self, wtd):
+ if wtd > len(self.post_buffer):
+ self._fill(wtd-len(self.post_buffer))
+ rv = self.post_buffer[:wtd]
+ self.post_buffer = self.post_buffer[wtd:]
+ return rv
+
+ def _fill(self, wtd):
+ self.pre_buffer = self.pre_buffer + self.ifp.read(wtd+4)
+ if self.ifp.eof:
+ self.post_buffer = self.post_buffer + \
+ binascii.rledecode_hqx(self.pre_buffer)
+ self.pre_buffer = ''
+ return
+
+ #
+ # Obfuscated code ahead. We have to take care that we don't
+ # end up with an orphaned RUNCHAR later on. So, we keep a couple
+ # of bytes in the buffer, depending on what the end of
+ # the buffer looks like:
+ # '\220\0\220' - Keep 3 bytes: repeated \220 (escaped as \220\0)
+ # '?\220' - Keep 2 bytes: repeated something-else
+ # '\220\0' - Escaped \220: Keep 2 bytes.
+ # '?\220?' - Complete repeat sequence: decode all
+ # otherwise: keep 1 byte.
+ #
+ mark = len(self.pre_buffer)
+ if self.pre_buffer[-3:] == RUNCHAR + '\0' + RUNCHAR:
+ mark = mark - 3
+ elif self.pre_buffer[-1] == RUNCHAR:
+ mark = mark - 2
+ elif self.pre_buffer[-2:] == RUNCHAR + '\0':
+ mark = mark - 2
+ elif self.pre_buffer[-2] == RUNCHAR:
+ pass # Decode all
+ else:
+ mark = mark - 1
+
+ self.post_buffer = self.post_buffer + \
+ binascii.rledecode_hqx(self.pre_buffer[:mark])
+ self.pre_buffer = self.pre_buffer[mark:]
+
+ def close(self):
+ self.ifp.close()
+
+class HexBin:
+ def __init__(self, ifp):
+ if type(ifp) == type(''):
+ ifp = open(ifp)
+ #
+ # Find initial colon.
+ #
+ while 1:
+ ch = ifp.read(1)
+ if not ch:
+ raise Error, "No binhex data found"
+ # Cater for \r\n terminated lines (which show up as \n\r, hence
+ # all lines start with \r)
+ if ch == '\r':
+ continue
+ if ch == ':':
+ break
+ if ch != '\n':
+ dummy = ifp.readline()
+
+ hqxifp = _Hqxdecoderengine(ifp)
+ self.ifp = _Rledecoderengine(hqxifp)
+ self.crc = 0
+ self._readheader()
+
+ def _read(self, len):
+ data = self.ifp.read(len)
+ self.crc = binascii.crc_hqx(data, self.crc)
+ return data
+
+ def _checkcrc(self):
+ filecrc = struct.unpack('>h', self.ifp.read(2))[0] & 0xffff
+ #self.crc = binascii.crc_hqx('\0\0', self.crc)
+ # XXXX Is this needed??
+ self.crc = self.crc & 0xffff
+ if filecrc != self.crc:
+ raise Error, 'CRC error, computed %x, read %x' \
+ %(self.crc, filecrc)
+ self.crc = 0
+
+ def _readheader(self):
+ len = self._read(1)
+ fname = self._read(ord(len))
+ rest = self._read(1+4+4+2+4+4)
+ self._checkcrc()
+
+ type = rest[1:5]
+ creator = rest[5:9]
+ flags = struct.unpack('>h', rest[9:11])[0]
+ self.dlen = struct.unpack('>l', rest[11:15])[0]
+ self.rlen = struct.unpack('>l', rest[15:19])[0]
+
+ self.FName = fname
+ self.FInfo = FInfo()
+ self.FInfo.Creator = creator
+ self.FInfo.Type = type
+ self.FInfo.Flags = flags
+
+ self.state = _DID_HEADER
+
+ def read(self, *n):
+ if self.state != _DID_HEADER:
+ raise Error, 'Read data at wrong time'
+ if n:
+ n = n[0]
+ n = min(n, self.dlen)
+ else:
+ n = self.dlen
+ rv = ''
+ while len(rv) < n:
+ rv = rv + self._read(n-len(rv))
+ self.dlen = self.dlen - n
+ return rv
+
+ def close_data(self):
+ if self.state != _DID_HEADER:
+ raise Error, 'close_data at wrong time'
+ if self.dlen:
+ dummy = self._read(self.dlen)
+ self._checkcrc()
+ self.state = _DID_DATA
+
+ def read_rsrc(self, *n):
+ if self.state == _DID_HEADER:
+ self.close_data()
+ if self.state != _DID_DATA:
+ raise Error, 'Read resource data at wrong time'
+ if n:
+ n = n[0]
+ n = min(n, self.rlen)
+ else:
+ n = self.rlen
+ self.rlen = self.rlen - n
+ return self._read(n)
+
+ def close(self):
+ if self.rlen:
+ dummy = self.read_rsrc(self.rlen)
+ self._checkcrc()
+ self.state = _DID_RSRC
+ self.ifp.close()
+
+def hexbin(inp, out):
+ """(infilename, outfilename) - Decode binhexed file"""
+ ifp = HexBin(inp)
+ finfo = ifp.FInfo
+ if not out:
+ out = ifp.FName
+ if os.name == 'mac':
+ ofss = macfs.FSSpec(out)
+ out = ofss.as_pathname()
+
+ ofp = open(out, 'wb')
+ # XXXX Do translation on non-mac systems
+ while 1:
+ d = ifp.read(128000)
+ if not d: break
+ ofp.write(d)
+ ofp.close()
+ ifp.close_data()
+
+ d = ifp.read_rsrc(128000)
+ if d:
+ ofp = openrsrc(out, 'wb')
+ ofp.write(d)
+ while 1:
+ d = ifp.read_rsrc(128000)
+ if not d: break
+ ofp.write(d)
+ ofp.close()
+
+ if os.name == 'mac':
+ nfinfo = ofss.GetFInfo()
+ nfinfo.Creator = finfo.Creator
+ nfinfo.Type = finfo.Type
+ nfinfo.Flags = finfo.Flags
+ ofss.SetFInfo(nfinfo)
+
+ ifp.close()
+
+def _test():
+ if os.name == 'mac':
+ fss, ok = macfs.PromptGetFile('File to convert:')
+ if not ok:
+ sys.exit(0)
+ fname = fss.as_pathname()
+ else:
+ fname = sys.argv[1]
+ binhex(fname, fname+'.hqx')
+ hexbin(fname+'.hqx', fname+'.viahqx')
+ #hexbin(fname, fname+'.unpacked')
+ sys.exit(1)
+
+if __name__ == '__main__':
+ _test()
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