/usr/lib/python3/dist-packages/fontTools/misc/macRes.py is in python3-fonttools 3.21.2-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 | """ Tools for reading Mac resource forks. """
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
import struct
from fontTools.misc import sstruct
from collections import OrderedDict
try:
from collections.abc import MutableMapping
except ImportError:
from UserDict import DictMixin as MutableMapping
class ResourceError(Exception):
pass
class ResourceReader(MutableMapping):
def __init__(self, fileOrPath):
self._resources = OrderedDict()
if hasattr(fileOrPath, 'read'):
self.file = fileOrPath
else:
try:
# try reading from the resource fork (only works on OS X)
self.file = self.openResourceFork(fileOrPath)
self._readFile()
return
except (ResourceError, IOError):
# if it fails, use the data fork
self.file = self.openDataFork(fileOrPath)
self._readFile()
@staticmethod
def openResourceFork(path):
with open(path + '/..namedfork/rsrc', 'rb') as resfork:
data = resfork.read()
infile = BytesIO(data)
infile.name = path
return infile
@staticmethod
def openDataFork(path):
with open(path, 'rb') as datafork:
data = datafork.read()
infile = BytesIO(data)
infile.name = path
return infile
def _readFile(self):
self._readHeaderAndMap()
self._readTypeList()
def _read(self, numBytes, offset=None):
if offset is not None:
try:
self.file.seek(offset)
except OverflowError:
raise ResourceError("Failed to seek offset ('offset' is too large)")
if self.file.tell() != offset:
raise ResourceError('Failed to seek offset (reached EOF)')
try:
data = self.file.read(numBytes)
except OverflowError:
raise ResourceError("Cannot read resource ('numBytes' is too large)")
if len(data) != numBytes:
raise ResourceError('Cannot read resource (not enough data)')
return data
def _readHeaderAndMap(self):
self.file.seek(0)
headerData = self._read(ResourceForkHeaderSize)
sstruct.unpack(ResourceForkHeader, headerData, self)
# seek to resource map, skip reserved
mapOffset = self.mapOffset + 22
resourceMapData = self._read(ResourceMapHeaderSize, mapOffset)
sstruct.unpack(ResourceMapHeader, resourceMapData, self)
self.absTypeListOffset = self.mapOffset + self.typeListOffset
self.absNameListOffset = self.mapOffset + self.nameListOffset
def _readTypeList(self):
absTypeListOffset = self.absTypeListOffset
numTypesData = self._read(2, absTypeListOffset)
self.numTypes, = struct.unpack('>H', numTypesData)
absTypeListOffset2 = absTypeListOffset + 2
for i in range(self.numTypes + 1):
resTypeItemOffset = absTypeListOffset2 + ResourceTypeItemSize * i
resTypeItemData = self._read(ResourceTypeItemSize, resTypeItemOffset)
item = sstruct.unpack(ResourceTypeItem, resTypeItemData)
resType = tostr(item['type'], encoding='mac-roman')
refListOffset = absTypeListOffset + item['refListOffset']
numRes = item['numRes'] + 1
resources = self._readReferenceList(resType, refListOffset, numRes)
self._resources[resType] = resources
def _readReferenceList(self, resType, refListOffset, numRes):
resources = []
for i in range(numRes):
refOffset = refListOffset + ResourceRefItemSize * i
refData = self._read(ResourceRefItemSize, refOffset)
res = Resource(resType)
res.decompile(refData, self)
resources.append(res)
return resources
def __getitem__(self, resType):
return self._resources[resType]
def __delitem__(self, resType):
del self._resources[resType]
def __setitem__(self, resType, resources):
self._resources[resType] = resources
def __len__(self):
return len(self._resources)
def __iter__(self):
return iter(self._resources)
def keys(self):
return self._resources.keys()
@property
def types(self):
return list(self._resources.keys())
def countResources(self, resType):
"""Return the number of resources of a given type."""
try:
return len(self[resType])
except KeyError:
return 0
def getIndices(self, resType):
numRes = self.countResources(resType)
if numRes:
return list(range(1, numRes+1))
else:
return []
def getNames(self, resType):
"""Return list of names of all resources of a given type."""
return [res.name for res in self.get(resType, []) if res.name is not None]
def getIndResource(self, resType, index):
"""Return resource of given type located at an index ranging from 1
to the number of resources for that type, or None if not found.
"""
if index < 1:
return None
try:
res = self[resType][index-1]
except (KeyError, IndexError):
return None
return res
def getNamedResource(self, resType, name):
"""Return the named resource of given type, else return None."""
name = tostr(name, encoding='mac-roman')
for res in self.get(resType, []):
if res.name == name:
return res
return None
def close(self):
if not self.file.closed:
self.file.close()
class Resource(object):
def __init__(self, resType=None, resData=None, resID=None, resName=None,
resAttr=None):
self.type = resType
self.data = resData
self.id = resID
self.name = resName
self.attr = resAttr
def decompile(self, refData, reader):
sstruct.unpack(ResourceRefItem, refData, self)
# interpret 3-byte dataOffset as (padded) ULONG to unpack it with struct
self.dataOffset, = struct.unpack('>L', bytesjoin([b"\0", self.dataOffset]))
absDataOffset = reader.dataOffset + self.dataOffset
dataLength, = struct.unpack(">L", reader._read(4, absDataOffset))
self.data = reader._read(dataLength)
if self.nameOffset == -1:
return
absNameOffset = reader.absNameListOffset + self.nameOffset
nameLength, = struct.unpack('B', reader._read(1, absNameOffset))
name, = struct.unpack('>%ss' % nameLength, reader._read(nameLength))
self.name = tostr(name, encoding='mac-roman')
ResourceForkHeader = """
> # big endian
dataOffset: L
mapOffset: L
dataLen: L
mapLen: L
"""
ResourceForkHeaderSize = sstruct.calcsize(ResourceForkHeader)
ResourceMapHeader = """
> # big endian
attr: H
typeListOffset: H
nameListOffset: H
"""
ResourceMapHeaderSize = sstruct.calcsize(ResourceMapHeader)
ResourceTypeItem = """
> # big endian
type: 4s
numRes: H
refListOffset: H
"""
ResourceTypeItemSize = sstruct.calcsize(ResourceTypeItem)
ResourceRefItem = """
> # big endian
id: h
nameOffset: h
attr: B
dataOffset: 3s
reserved: L
"""
ResourceRefItemSize = sstruct.calcsize(ResourceRefItem)
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