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108 lines
3.8 KiB
Python
108 lines
3.8 KiB
Python
"""
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Canon CR2 raw image data, version 2.0 image parser.
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Authors: Fernando Crespo
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Creation date: 21 february 2017
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"""
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from hachoir.parser import Parser
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from hachoir.field import SeekableFieldSet, RootSeekableFieldSet, Bytes, String, UInt8, UInt16, UInt32
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from hachoir.core.endian import LITTLE_ENDIAN, BIG_ENDIAN
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from hachoir.core.text_handler import textHandler, hexadecimal
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from hachoir.parser.image.exif import IFD, IFD_TAGS
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def getStrips(ifd):
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data = {}
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for i, entry in enumerate(ifd.array('entry')):
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data[entry['tag'].display] = entry
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# image data
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if "StripOffsets" in data and "StripByteCounts" in data:
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offs = ifd.getEntryValues(data["StripOffsets"])
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bytes = ifd.getEntryValues(data["StripByteCounts"])
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for off, byte in zip(offs, bytes):
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yield off.value, byte.value
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class ImageFile(SeekableFieldSet):
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def __init__(self, parent, name, description, ifd):
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SeekableFieldSet.__init__(self, parent, name, description, None)
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self._ifd = ifd
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def createFields(self):
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for off, byte in getStrips(self._ifd):
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self.seekByte(off, relative=False)
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yield Bytes(self, "strip[]", byte)
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class CR2File(RootSeekableFieldSet, Parser):
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PARSER_TAGS = {
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"id": "cr2",
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"category": "image",
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"file_ext": ("cr2",),
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"mime": ("image/x-canon-cr2",),
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"min_size": 15,
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"magic": ((b"CR", 8),),
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"description": "Canon CR2 raw image data, version 2.0"
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}
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# Correct endian is set in constructor
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endian = LITTLE_ENDIAN
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def __init__(self, stream, **args):
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RootSeekableFieldSet.__init__(
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self, None, "root", stream, None, stream.askSize(self))
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if self.stream.readBytes(0, 2) == b"MM":
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self.endian = BIG_ENDIAN
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Parser.__init__(self, stream, **args)
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def validate(self):
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endian = self.stream.readBytes(0, 2)
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if endian not in (b"MM", b"II"):
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return "Invalid endian (%r)" % endian
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if self["version"].value != 42:
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return "Unknown Canon TIFF version - " + str(self["version"].value)
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if self["cr_identifier"].value != "CR":
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return "Unknown Canon Raw File"
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return True
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def createFields(self):
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iff_start = self.absolute_address
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yield String(self, "endian", 2, "Endian ('II' or 'MM')", charset="ASCII")
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if self["endian"].value == "II":
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self.endian = LITTLE_ENDIAN
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else:
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self.endian = BIG_ENDIAN
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yield UInt16(self, "version", "TIFF version number")
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yield UInt32(self, "img_dir_ofs", "Next image directory offset")
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yield String(self, "cr_identifier", 2, "Canon Raw marker", charset="ASCII")
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yield UInt8(self, "cr_major_version", "Canon Raw major version number")
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yield UInt8(self, "cr_minor_version", "Canon Raw minor version number")
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yield textHandler(UInt32(self, "cr_raw_ifd_offset", "Offset to Raw IFD"), hexadecimal)
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offsets = [(self['img_dir_ofs'].value, 'ifd[]', IFD)]
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while offsets:
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offset, name, klass = offsets.pop(0)
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self.seekByte(offset + iff_start // 8, relative=False)
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ifd = klass(self, name, iff_start)
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yield ifd
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for entry in ifd.array('entry'):
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tag = entry['tag'].value
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if tag in IFD_TAGS:
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name, klass = IFD_TAGS[tag]
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offsets.append((ifd.getEntryValues(entry)[
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0].value, name + '[]', klass))
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if ifd['next'].value != 0:
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offsets.append((ifd['next'].value, 'ifd[]', IFD))
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for ifd in self.array('ifd'):
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offs = (off for off, byte in getStrips(ifd))
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self.seekByte(min(offs), relative=False)
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image = ImageFile(self, "image[]", "Image File", ifd)
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yield image
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