212 lines
8.2 KiB
Python
212 lines
8.2 KiB
Python
"""
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TIFF image parser.
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Authors: Victor Stinner and Sebastien Ponce
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Creation date: 30 september 2006
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"""
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from lib.hachoir_parser import Parser
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from lib.hachoir_core.field import (FieldSet, SeekableFieldSet, ParserError, RootSeekableFieldSet,
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UInt16, UInt32, Bytes, String)
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from lib.hachoir_core.endian import LITTLE_ENDIAN, BIG_ENDIAN
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from lib.hachoir_parser.image.exif import BasicIFDEntry
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from lib.hachoir_core.tools import createDict
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MAX_COUNT = 250
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class IFDEntry(BasicIFDEntry):
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static_size = 12*8
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TAG_INFO = {
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254: ("new_subfile_type", "New subfile type"),
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255: ("subfile_type", "Subfile type"),
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256: ("img_width", "Image width in pixels"),
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257: ("img_height", "Image height in pixels"),
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258: ("bits_per_sample", "Bits per sample"),
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259: ("compression", "Compression method"),
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262: ("photo_interpret", "Photometric interpretation"),
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263: ("thres", "Thresholding"),
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264: ("cell_width", "Cellule width"),
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265: ("cell_height", "Cellule height"),
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266: ("fill_order", "Fill order"),
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269: ("doc_name", "Document name"),
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270: ("description", "Image description"),
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271: ("make", "Make"),
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272: ("model", "Model"),
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273: ("strip_ofs", "Strip offsets"),
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274: ("orientation", "Orientation"),
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277: ("sample_pixel", "Samples per pixel"),
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278: ("row_per_strip", "Rows per strip"),
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279: ("strip_byte", "Strip byte counts"),
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280: ("min_sample_value", "Min sample value"),
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281: ("max_sample_value", "Max sample value"),
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282: ("xres", "X resolution"),
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283: ("yres", "Y resolution"),
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284: ("planar_conf", "Planar configuration"),
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285: ("page_name", "Page name"),
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286: ("xpos", "X position"),
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287: ("ypos", "Y position"),
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288: ("free_ofs", "Free offsets"),
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289: ("free_byte", "Free byte counts"),
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290: ("gray_resp_unit", "Gray response unit"),
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291: ("gray_resp_curve", "Gray response curve"),
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292: ("group3_opt", "Group 3 options"),
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293: ("group4_opt", "Group 4 options"),
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296: ("res_unit", "Resolution unit"),
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297: ("page_nb", "Page number"),
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301: ("color_respt_curve", "Color response curves"),
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305: ("software", "Software"),
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306: ("date_time", "Date time"),
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315: ("artist", "Artist"),
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316: ("host_computer", "Host computer"),
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317: ("predicator", "Predicator"),
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318: ("white_pt", "White point"),
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319: ("prim_chomat", "Primary chromaticities"),
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320: ("color_map", "Color map"),
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321: ("half_tone_hints", "Halftone Hints"),
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322: ("tile_width", "TileWidth"),
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323: ("tile_length", "TileLength"),
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324: ("tile_offsets", "TileOffsets"),
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325: ("tile_byte_counts", "TileByteCounts"),
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332: ("ink_set", "InkSet"),
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333: ("ink_names", "InkNames"),
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334: ("number_of_inks", "NumberOfInks"),
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336: ("dot_range", "DotRange"),
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337: ("target_printer", "TargetPrinter"),
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338: ("extra_samples", "ExtraSamples"),
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339: ("sample_format", "SampleFormat"),
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340: ("smin_sample_value", "SMinSampleValue"),
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341: ("smax_sample_value", "SMaxSampleValue"),
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342: ("transfer_range", "TransferRange"),
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512: ("jpeg_proc", "JPEGProc"),
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513: ("jpeg_interchange_format", "JPEGInterchangeFormat"),
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514: ("jpeg_interchange_format_length", "JPEGInterchangeFormatLength"),
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515: ("jpeg_restart_interval", "JPEGRestartInterval"),
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517: ("jpeg_lossless_predictors", "JPEGLosslessPredictors"),
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518: ("jpeg_point_transforms", "JPEGPointTransforms"),
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519: ("jpeg_qtables", "JPEGQTables"),
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520: ("jpeg_dctables", "JPEGDCTables"),
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521: ("jpeg_actables", "JPEGACTables"),
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529: ("ycbcr_coefficients", "YCbCrCoefficients"),
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530: ("ycbcr_subsampling", "YCbCrSubSampling"),
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531: ("ycbcr_positioning", "YCbCrPositioning"),
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532: ("reference_blackwhite", "ReferenceBlackWhite"),
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33432: ("copyright", "Copyright"),
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0x8769: ("ifd_pointer", "Pointer to next IFD entry"),
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}
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TAG_NAME = createDict(TAG_INFO, 0)
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def __init__(self, *args):
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FieldSet.__init__(self, *args)
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tag = self["tag"].value
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if tag in self.TAG_INFO:
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self._name, self._description = self.TAG_INFO[tag]
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else:
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self._parser = None
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class IFD(FieldSet):
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def __init__(self, *args):
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FieldSet.__init__(self, *args)
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self._size = 16 + self["count"].value * IFDEntry.static_size
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self._has_offset = False
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def createFields(self):
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yield UInt16(self, "count")
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if MAX_COUNT < self["count"].value:
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raise ParserError("TIFF IFD: Invalid count (%s)"
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% self["count"].value)
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for index in xrange(self["count"].value):
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yield IFDEntry(self, "entry[]")
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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._has_offset = False
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self._ifd = ifd
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def createFields(self):
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datas = {}
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for entry in self._ifd:
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if type(entry) != IFDEntry:
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continue
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for c in entry:
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if c.name != "offset":
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continue
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self.seekByte(c.value, False)
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desc = "data of ifd entry " + entry.name,
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entryType = BasicIFDEntry.ENTRY_FORMAT[entry["type"].value]
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count = entry["count"].value
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if entryType == String:
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yield String(self, entry.name, count, desc, "\0", "ISO-8859-1")
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else:
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d = Data(self, entry.name, desc, entryType, count)
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datas[d.name] = d
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yield d
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break
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# image data
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if "strip_ofs" in datas and "strip_byte" in datas:
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for i in xrange(datas["strip_byte"]._count):
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self.seekByte(datas["strip_ofs"]["value["+str(i)+"]"].value, False)
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yield Bytes(self, "strip[]", datas["strip_byte"]["value["+str(i)+"]"].value)
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class Data(FieldSet):
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def __init__(self, parent, name, desc, type, count):
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size = type.static_size * count
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FieldSet.__init__(self, parent, name, desc, size)
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self._count = count
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self._type = type
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def createFields(self):
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for i in xrange(self._count):
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yield self._type(self, "value[]")
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class TiffFile(RootSeekableFieldSet, Parser):
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PARSER_TAGS = {
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"id": "tiff",
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"category": "image",
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"file_ext": ("tif", "tiff"),
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"mime": (u"image/tiff",),
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"min_size": 8*8,
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# TODO: Re-enable magic
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"magic": (("II\x2A\0", 0), ("MM\0\x2A", 0)),
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"description": "TIFF picture"
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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__(self, None, "root", stream, None, stream.askSize(self))
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if self.stream.readBytes(0, 2) == "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 ("MM", "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 TIFF version"
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return True
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def createFields(self):
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yield String(self, "endian", 2, 'Endian ("II" or "MM")', charset="ASCII")
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yield UInt16(self, "version", "TIFF version number")
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offset = UInt32(self, "img_dir_ofs[]", "Next image directory offset (in bytes from the beginning)")
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yield offset
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ifds = []
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while True:
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if offset.value == 0:
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break
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self.seekByte(offset.value, relative=False)
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ifd = IFD(self, "ifd[]", "Image File Directory", None)
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ifds.append(ifd)
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yield ifd
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offset = UInt32(self, "img_dir_ofs[]", "Next image directory offset (in bytes from the beginning)")
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yield offset
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for ifd in ifds:
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image = ImageFile(self, "image[]", "Image File", ifd)
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yield image
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