Mercurial > cpython-lru_cache-weakref
annotate Lib/binhex.py @ 4566:6403c94de50d legacy-trunk
Added safeguard against failure in __del__.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Wed, 27 Nov 1996 19:39:58 +0000 |
| parents | aec8bbcf8b0e |
| children | 6ece5cfb49ff |
| rev | line source |
|---|---|
| 2914 | 1 """binhex - Macintosh binhex compression/decompression |
| 2 easy interface: | |
| 3 binhex(inputfilename, outputfilename) | |
| 4 hexbin(inputfilename, outputfilename) | |
| 5 """ | |
| 6 | |
| 7 # | |
| 8 # Jack Jansen, CWI, August 1995. | |
| 9 # | |
| 10 # The module is supposed to be as compatible as possible. Especially the | |
| 11 # easy interface should work "as expected" on any platform. | |
| 12 # XXXX Note: currently, textfiles appear in mac-form on all platforms. | |
| 13 # We seem to lack a simple character-translate in python. | |
| 14 # (we should probably use ISO-Latin-1 on all but the mac platform). | |
| 15 # XXXX The simeple routines are too simple: they expect to hold the complete | |
| 16 # files in-core. Should be fixed. | |
| 17 # XXXX It would be nice to handle AppleDouble format on unix (for servers serving | |
| 18 # macs). | |
| 19 # XXXX I don't understand what happens when you get 0x90 times the same byte on | |
| 20 # input. The resulting code (xx 90 90) would appear to be interpreted as an | |
| 21 # escaped *value* of 0x90. All coders I've seen appear to ignore this nicety... | |
| 22 # | |
| 23 import sys | |
| 24 import os | |
| 25 import struct | |
| 26 import string | |
| 27 import binascii | |
|
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28 |
| 2914 | 29 Error = 'binhex.Error' |
| 30 | |
| 31 # States (what have we written) | |
| 32 [_DID_HEADER, _DID_DATA, _DID_RSRC] = range(3) | |
| 33 | |
| 34 # Various constants | |
| 35 REASONABLY_LARGE=32768 # Minimal amount we pass the rle-coder | |
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36 LINELEN=64 |
| 2914 | 37 RUNCHAR=chr(0x90) # run-length introducer |
| 38 | |
| 39 # | |
| 40 # The code is currently byte-order dependent | |
| 41 if struct.pack('i', 0177) != '\0\0\0\177': | |
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42 raise ImportError, 'Module binhex is big-endian only' |
| 2914 | 43 |
| 44 # | |
| 45 # Workarounds for non-mac machines. | |
| 46 if os.name == 'mac': | |
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47 import macfs |
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48 import MacOS |
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49 try: |
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50 openrf = MacOS.openrf |
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51 except AttributeError: |
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52 # Backward compatability |
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53 openrf = open |
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54 |
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55 def FInfo(): |
| 2914 | 56 return macfs.FInfo() |
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57 |
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58 def getfileinfo(name): |
| 2914 | 59 finfo = macfs.FSSpec(name).GetFInfo() |
| 60 dir, file = os.path.split(name) | |
| 61 # XXXX Get resource/data sizes | |
| 62 fp = open(name, 'rb') | |
| 63 fp.seek(0, 2) | |
| 64 dlen = fp.tell() | |
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65 fp = openrf(name, '*rb') |
| 2914 | 66 fp.seek(0, 2) |
| 67 rlen = fp.tell() | |
| 68 return file, finfo, dlen, rlen | |
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69 |
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70 def openrsrc(name, *mode): |
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71 if not mode: |
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72 mode = '*rb' |
| 2914 | 73 else: |
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74 mode = '*' + mode[0] |
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75 return openrf(name, mode) |
| 2914 | 76 |
| 77 else: | |
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78 # |
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79 # Glue code for non-macintosh useage |
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80 # |
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81 import regsub |
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82 |
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83 class FInfo: |
| 2914 | 84 def __init__(self): |
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85 self.Type = '????' |
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86 self.Creator = '????' |
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87 self.Flags = 0 |
| 2914 | 88 |
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89 def getfileinfo(name): |
| 2914 | 90 finfo = FInfo() |
| 91 # Quick check for textfile | |
| 92 fp = open(name) | |
| 93 data = open(name).read(256) | |
| 94 for c in data: | |
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95 if not c in string.whitespace and (c<' ' or ord(c) > 0177): |
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96 break |
| 2914 | 97 else: |
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98 finfo.Type = 'TEXT' |
| 2914 | 99 fp.seek(0, 2) |
| 100 dsize = fp.tell() | |
| 101 fp.close() | |
| 102 dir, file = os.path.split(name) | |
| 103 file = regsub.sub(':', '-', file) | |
| 104 return file, finfo, dsize, 0 | |
| 105 | |
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106 class openrsrc: |
| 2914 | 107 def __init__(self, *args): |
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108 pass |
| 2914 | 109 |
| 110 def read(self, *args): | |
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111 return '' |
| 2914 | 112 |
| 113 def write(self, *args): | |
| 114 pass | |
| 115 | |
| 116 def close(self): | |
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117 pass |
| 2914 | 118 |
| 119 class _Hqxcoderengine: | |
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120 """Write data to the coder in 3-byte chunks""" |
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121 |
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122 def __init__(self, ofp): |
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123 self.ofp = ofp |
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124 self.data = '' |
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125 self.hqxdata = '' |
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126 self.linelen = LINELEN-1 |
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127 |
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128 def write(self, data): |
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129 self.data = self.data + data |
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130 datalen = len(self.data) |
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131 todo = (datalen/3)*3 |
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132 data = self.data[:todo] |
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133 self.data = self.data[todo:] |
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134 if not data: |
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135 return |
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136 self.hqxdata = self.hqxdata + binascii.b2a_hqx(data) |
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137 self._flush(0) |
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138 |
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139 def _flush(self, force): |
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140 first = 0 |
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141 while first <= len(self.hqxdata)-self.linelen: |
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142 last = first + self.linelen |
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143 self.ofp.write(self.hqxdata[first:last]+'\n') |
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144 self.linelen = LINELEN |
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145 first = last |
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146 self.hqxdata = self.hqxdata[first:] |
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147 if force: |
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148 self.ofp.write(self.hqxdata + ':\n') |
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149 |
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150 def close(self): |
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151 if self.data: |
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152 self.hqxdata = self.hqxdata + binascii.b2a_hqx(self.data) |
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153 self._flush(1) |
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154 self.ofp.close() |
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155 del self.ofp |
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156 |
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157 class _Rlecoderengine: |
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158 """Write data to the RLE-coder in suitably large chunks""" |
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159 |
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160 def __init__(self, ofp): |
| 2914 | 161 self.ofp = ofp |
| 162 self.data = '' | |
| 163 | |
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164 def write(self, data): |
| 2914 | 165 self.data = self.data + data |
| 166 if len(self.data) < REASONABLY_LARGE: | |
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167 return |
| 2914 | 168 rledata = binascii.rlecode_hqx(self.data) |
| 169 self.ofp.write(rledata) | |
| 170 self.data = '' | |
| 171 | |
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172 def close(self): |
| 2914 | 173 if self.data: |
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174 rledata = binascii.rlecode_hqx(self.data) |
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175 self.ofp.write(rledata) |
| 2914 | 176 self.ofp.close() |
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177 del self.ofp |
| 2914 | 178 |
| 179 class BinHex: | |
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180 def __init__(self, (name, finfo, dlen, rlen), ofp): |
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181 if type(ofp) == type(''): |
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182 ofname = ofp |
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183 ofp = open(ofname, 'w') |
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184 if os.name == 'mac': |
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185 fss = macfs.FSSpec(ofname) |
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186 fss.SetCreatorType('BnHq', 'TEXT') |
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187 ofp.write('(This file must be converted with BinHex 4.0)\n\n:') |
| 2914 | 188 hqxer = _Hqxcoderengine(ofp) |
| 189 self.ofp = _Rlecoderengine(hqxer) | |
| 190 self.crc = 0 | |
| 191 if finfo == None: | |
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192 finfo = FInfo() |
| 2914 | 193 self.dlen = dlen |
| 194 self.rlen = rlen | |
| 195 self._writeinfo(name, finfo) | |
| 196 self.state = _DID_HEADER | |
| 197 | |
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198 def _writeinfo(self, name, finfo): |
| 2914 | 199 name = name |
| 200 nl = len(name) | |
| 201 if nl > 63: | |
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202 raise Error, 'Filename too long' |
| 2914 | 203 d = chr(nl) + name + '\0' |
| 204 d2 = finfo.Type + finfo.Creator | |
| 205 d3 = struct.pack('h', finfo.Flags) | |
| 206 d4 = struct.pack('ii', self.dlen, self.rlen) | |
| 207 info = d + d2 + d3 + d4 | |
| 208 self._write(info) | |
| 209 self._writecrc() | |
| 210 | |
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211 def _write(self, data): |
| 2914 | 212 self.crc = binascii.crc_hqx(data, self.crc) |
| 213 self.ofp.write(data) | |
| 214 | |
|
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215 def _writecrc(self): |
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216 ## self.crc = binascii.crc_hqx('\0\0', self.crc) # XXXX Should this be here?? |
| 2914 | 217 self.ofp.write(struct.pack('h', self.crc)) |
| 218 self.crc = 0 | |
| 219 | |
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220 def write(self, data): |
| 2914 | 221 if self.state != _DID_HEADER: |
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222 raise Error, 'Writing data at the wrong time' |
| 2914 | 223 self.dlen = self.dlen - len(data) |
| 224 self._write(data) | |
| 225 | |
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226 def close_data(self): |
| 2914 | 227 if self.dlen <> 0: |
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228 raise Error, 'Incorrect data size, diff='+`self.rlen` |
| 2914 | 229 self._writecrc() |
| 230 self.state = _DID_DATA | |
| 231 | |
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232 def write_rsrc(self, data): |
| 2914 | 233 if self.state < _DID_DATA: |
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234 self.close_data() |
| 2914 | 235 if self.state != _DID_DATA: |
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236 raise Error, 'Writing resource data at the wrong time' |
| 2914 | 237 self.rlen = self.rlen - len(data) |
| 238 self._write(data) | |
| 239 | |
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240 def close(self): |
| 2914 | 241 if self.state < _DID_DATA: |
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242 self.close_data() |
| 2914 | 243 if self.state != _DID_DATA: |
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244 raise Error, 'Close at the wrong time' |
| 2914 | 245 if self.rlen <> 0: |
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246 raise Error, "Incorrect resource-datasize, diff="+`self.rlen` |
| 2914 | 247 self._writecrc() |
| 248 self.ofp.close() | |
| 249 self.state = None | |
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250 del self.ofp |
| 2914 | 251 |
| 252 def binhex(inp, out): | |
| 253 """(infilename, outfilename) - Create binhex-encoded copy of a file""" | |
| 254 finfo = getfileinfo(inp) | |
| 255 ofp = BinHex(finfo, out) | |
| 256 | |
| 257 ifp = open(inp, 'rb') | |
| 258 # XXXX Do textfile translation on non-mac systems | |
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259 while 1: |
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260 d = ifp.read(128000) |
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261 if not d: break |
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262 ofp.write(d) |
| 2914 | 263 ofp.close_data() |
| 264 ifp.close() | |
| 265 | |
| 266 ifp = openrsrc(inp, 'rb') | |
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267 while 1: |
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268 d = ifp.read(128000) |
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269 if not d: break |
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270 ofp.write_rsrc(d) |
| 2914 | 271 ofp.close() |
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272 ifp.close() |
| 2914 | 273 |
| 274 class _Hqxdecoderengine: | |
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275 """Read data via the decoder in 4-byte chunks""" |
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276 |
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277 def __init__(self, ifp): |
| 2914 | 278 self.ifp = ifp |
| 279 self.eof = 0 | |
| 280 | |
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281 def read(self, totalwtd): |
| 2914 | 282 """Read at least wtd bytes (or until EOF)""" |
| 283 decdata = '' | |
| 3142 | 284 wtd = totalwtd |
| 2914 | 285 # |
| 286 # The loop here is convoluted, since we don't really now how much | |
| 287 # to decode: there may be newlines in the incoming data. | |
| 288 while wtd > 0: | |
| 289 if self.eof: return decdata | |
| 290 wtd = ((wtd+2)/3)*4 | |
| 291 data = self.ifp.read(wtd) | |
| 292 # | |
| 293 # Next problem: there may not be a complete number of bytes in what we | |
| 294 # pass to a2b. Solve by yet another loop. | |
| 295 # | |
| 296 while 1: | |
| 297 try: | |
| 298 decdatacur, self.eof = binascii.a2b_hqx(data) | |
| 299 break | |
| 300 except binascii.Incomplete: | |
| 301 pass | |
| 302 newdata = self.ifp.read(1) | |
| 303 if not newdata: | |
| 304 raise Error, 'Premature EOF on binhex file' | |
| 305 data = data + newdata | |
| 306 decdata = decdata + decdatacur | |
| 3142 | 307 wtd = totalwtd - len(decdata) |
| 2914 | 308 if not decdata and not self.eof: |
| 309 raise Error, 'Premature EOF on binhex file' | |
| 310 return decdata | |
| 311 | |
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312 def close(self): |
| 2914 | 313 self.ifp.close() |
| 314 | |
| 315 class _Rledecoderengine: | |
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316 """Read data via the RLE-coder""" |
| 2914 | 317 |
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318 def __init__(self, ifp): |
| 2914 | 319 self.ifp = ifp |
| 320 self.pre_buffer = '' | |
| 321 self.post_buffer = '' | |
| 322 self.eof = 0 | |
| 323 | |
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324 def read(self, wtd): |
| 2914 | 325 if wtd > len(self.post_buffer): |
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326 self._fill(wtd-len(self.post_buffer)) |
| 2914 | 327 rv = self.post_buffer[:wtd] |
| 328 self.post_buffer = self.post_buffer[wtd:] | |
| 329 return rv | |
| 330 | |
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331 def _fill(self, wtd): |
| 2914 | 332 # |
| 333 # Obfuscated code ahead. We keep at least one byte in the pre_buffer, | |
| 334 # so we don't stumble over an orphaned RUNCHAR later on. If the | |
| 335 # last or second-last char is a RUNCHAR we keep more bytes. | |
| 336 # | |
| 337 self.pre_buffer = self.pre_buffer + self.ifp.read(wtd+2) | |
| 338 if self.ifp.eof: | |
| 339 self.post_buffer = self.post_buffer + \ | |
| 340 binascii.rledecode_hqx(self.pre_buffer) | |
| 341 self.pre_buffer = '' | |
| 342 return | |
| 343 | |
| 344 lastrle = string.rfind(self.pre_buffer, RUNCHAR) | |
| 345 if lastrle > 0 and lastrle == len(self.pre_buffer)-1: | |
| 346 # Last byte is an RLE, keep two bytes | |
| 347 mark = len(self.pre_buffer)-2 | |
| 348 elif lastrle > 0 and lastrle == len(self.pre_buffer)-2: | |
| 349 # second-last byte is an RLE. Decode all. | |
| 350 mark = len(self.pre_buffer) | |
| 351 else: | |
| 352 mark = len(self.pre_buffer)-1 | |
| 353 self.post_buffer = self.post_buffer + \ | |
| 354 binascii.rledecode_hqx(self.pre_buffer[:mark]) | |
| 355 self.pre_buffer = self.pre_buffer[mark:] | |
| 356 | |
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357 def close(self): |
| 2914 | 358 self.ifp.close() |
| 359 | |
| 360 class HexBin: | |
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361 def __init__(self, ifp): |
| 2914 | 362 if type(ifp) == type(''): |
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363 ifp = open(ifp) |
| 2914 | 364 # |
| 365 # Find initial colon. | |
| 366 # | |
| 367 while 1: | |
| 368 ch = ifp.read(1) | |
| 369 if not ch: | |
| 370 raise Error, "No binhex data found" | |
| 371 if ch == ':': | |
| 372 break | |
| 373 if ch != '\n': | |
| 374 dummy = ifp.readline() | |
| 375 | |
| 376 hqxifp = _Hqxdecoderengine(ifp) | |
| 377 self.ifp = _Rledecoderengine(hqxifp) | |
| 378 self.crc = 0 | |
| 379 self._readheader() | |
| 380 | |
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381 def _read(self, len): |
| 2914 | 382 data = self.ifp.read(len) |
| 383 self.crc = binascii.crc_hqx(data, self.crc) | |
| 384 return data | |
| 385 | |
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386 def _checkcrc(self): |
| 2914 | 387 filecrc = struct.unpack('h', self.ifp.read(2))[0] & 0xffff |
| 3142 | 388 ## self.crc = binascii.crc_hqx('\0\0', self.crc) # XXXX Is this needed?? |
| 2914 | 389 self.crc = self.crc & 0xffff |
| 3142 | 390 if filecrc != self.crc: |
| 391 raise Error, 'CRC error, computed %x, read %x'%(self.crc, filecrc) | |
| 2914 | 392 self.crc = 0 |
| 393 | |
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394 def _readheader(self): |
| 2914 | 395 len = self._read(1) |
| 396 fname = self._read(ord(len)) | |
| 397 rest = self._read(1+4+4+2+4+4) | |
| 398 self._checkcrc() | |
| 399 | |
| 400 type = rest[1:5] | |
| 401 creator = rest[5:9] | |
| 402 flags = struct.unpack('h', rest[9:11])[0] | |
| 403 self.dlen = struct.unpack('l', rest[11:15])[0] | |
| 404 self.rlen = struct.unpack('l', rest[15:19])[0] | |
| 405 | |
| 406 self.FName = fname | |
| 407 self.FInfo = FInfo() | |
| 408 self.FInfo.Creator = creator | |
| 409 self.FInfo.Type = type | |
| 410 self.FInfo.Flags = flags | |
| 411 | |
| 412 self.state = _DID_HEADER | |
| 413 | |
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414 def read(self, *n): |
| 2914 | 415 if self.state != _DID_HEADER: |
| 416 raise Error, 'Read data at wrong time' | |
| 417 if n: | |
| 418 n = n[0] | |
| 419 n = min(n, self.dlen) | |
| 420 else: | |
| 421 n = self.dlen | |
| 422 self.dlen = self.dlen - n | |
| 423 return self._read(n) | |
| 424 | |
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425 def close_data(self): |
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426 if self.state != _DID_HEADER: |
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427 raise Error, 'close_data at wrong time' |
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428 if self.dlen: |
| 2914 | 429 dummy = self._read(self.dlen) |
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430 self._checkcrc() |
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431 self.state = _DID_DATA |
| 2914 | 432 |
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433 def read_rsrc(self, *n): |
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434 if self.state == _DID_HEADER: |
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435 self.close_data() |
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436 if self.state != _DID_DATA: |
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437 raise Error, 'Read resource data at wrong time' |
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438 if n: |
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439 n = n[0] |
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440 n = min(n, self.rlen) |
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441 else: |
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442 n = self.rlen |
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443 self.rlen = self.rlen - n |
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444 return self._read(n) |
| 2914 | 445 |
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446 def close(self): |
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447 if self.rlen: |
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448 dummy = self.read_rsrc(self.rlen) |
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449 self._checkcrc() |
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450 self.state = _DID_RSRC |
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451 self.ifp.close() |
| 2914 | 452 |
| 453 def hexbin(inp, out): | |
| 454 """(infilename, outfilename) - Decode binhexed file""" | |
| 455 ifp = HexBin(inp) | |
| 456 finfo = ifp.FInfo | |
| 457 if not out: | |
| 458 out = ifp.FName | |
| 459 if os.name == 'mac': | |
| 460 ofss = macfs.FSSpec(out) | |
| 461 out = ofss.as_pathname() | |
| 462 | |
| 463 ofp = open(out, 'wb') | |
| 464 # XXXX Do translation on non-mac systems | |
|
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Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
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465 while 1: |
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466 d = ifp.read(128000) |
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Guido van Rossum <guido@python.org>
parents:
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467 if not d: break |
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11299e95cae8
Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
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468 ofp.write(d) |
| 2914 | 469 ofp.close() |
| 470 ifp.close_data() | |
| 471 | |
|
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Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
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diff
changeset
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472 d = ifp.read_rsrc(128000) |
| 2914 | 473 if d: |
| 474 ofp = openrsrc(out, 'wb') | |
| 475 ofp.write(d) | |
|
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Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
3142
diff
changeset
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476 while 1: |
|
11299e95cae8
Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
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diff
changeset
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477 d = ifp.read_rsrc(128000) |
|
11299e95cae8
Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
3142
diff
changeset
|
478 if not d: break |
|
11299e95cae8
Finally check in Jack's latest version, which fixes all known bugs.
Guido van Rossum <guido@python.org>
parents:
3142
diff
changeset
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479 ofp.write(d) |
| 2914 | 480 ofp.close() |
| 481 | |
| 482 if os.name == 'mac': | |
| 483 nfinfo = ofss.GetFInfo() | |
| 484 nfinfo.Creator = finfo.Creator | |
| 485 nfinfo.Type = finfo.Type | |
| 486 nfinfo.Flags = finfo.Flags | |
| 487 ofss.SetFInfo(nfinfo) | |
| 488 | |
| 489 ifp.close() | |
| 490 | |
| 491 def _test(): | |
| 492 if os.name == 'mac': | |
|
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Jack Jansen <jack.jansen@cwi.nl>
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493 fss, ok = macfs.PromptGetFile('File to convert:') |
| 2914 | 494 if not ok: |
| 495 sys.exit(0) | |
| 496 fname = fss.as_pathname() | |
| 497 else: | |
| 498 fname = sys.argv[1] | |
| 499 #binhex(fname, fname+'.hqx') | |
| 500 #hexbin(fname+'.hqx', fname+'.viahqx') | |
| 501 hexbin(fname, fname+'.unpacked') | |
| 502 sys.exit(1) | |
| 503 | |
| 504 if __name__ == '__main__': | |
| 505 _test() |