# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild import array import struct import zlib from enum import Enum from kaitaistruct import BytesIO, KaitaiStream, KaitaiStruct from kaitaistruct import __version__ as ks_version from pkg_resources import parse_version if parse_version(ks_version) < parse_version('0.7'): raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version)) class Png(KaitaiStruct): class ColorType(Enum): greyscale = 0 truecolor = 2 indexed = 3 greyscale_alpha = 4 truecolor_alpha = 6 class PhysUnit(Enum): unknown = 0 meter = 1 def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.magic = self._io.ensure_fixed_contents(struct.pack('8b', -119, 80, 78, 71, 13, 10, 26, 10)) self.ihdr_len = self._io.ensure_fixed_contents(struct.pack('4b', 0, 0, 0, 13)) self.ihdr_type = self._io.ensure_fixed_contents(struct.pack('4b', 73, 72, 68, 82)) self.ihdr = self._root.IhdrChunk(self._io, self, self._root) self.ihdr_crc = self._io.read_bytes(4) self.chunks = [] while True: _ = self._root.Chunk(self._io, self, self._root) self.chunks.append(_) if ((_.type == u"IEND") or (self._io.is_eof())) : break class Rgb(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.r = self._io.read_u1() self.g = self._io.read_u1() self.b = self._io.read_u1() class Chunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.len = self._io.read_u4be() self.type = (self._io.read_bytes(4)).decode(u"UTF-8") _on = self.type if _on == u"iTXt": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.InternationalTextChunk(io, self, self._root) elif _on == u"gAMA": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.GamaChunk(io, self, self._root) elif _on == u"tIME": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.TimeChunk(io, self, self._root) elif _on == u"PLTE": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.PlteChunk(io, self, self._root) elif _on == u"bKGD": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.BkgdChunk(io, self, self._root) elif _on == u"pHYs": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.PhysChunk(io, self, self._root) elif _on == u"tEXt": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.TextChunk(io, self, self._root) elif _on == u"cHRM": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.ChrmChunk(io, self, self._root) elif _on == u"sRGB": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.SrgbChunk(io, self, self._root) elif _on == u"zTXt": self._raw_body = self._io.read_bytes(self.len) io = KaitaiStream(BytesIO(self._raw_body)) self.body = self._root.CompressedTextChunk(io, self, self._root) else: self.body = self._io.read_bytes(self.len) self.crc = self._io.read_bytes(4) class BkgdIndexed(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.palette_index = self._io.read_u1() class Point(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.x_int = self._io.read_u4be() self.y_int = self._io.read_u4be() @property def x(self): if hasattr(self, '_m_x'): return self._m_x if hasattr(self, '_m_x') else None self._m_x = (self.x_int / 100000.0) return self._m_x if hasattr(self, '_m_x') else None @property def y(self): if hasattr(self, '_m_y'): return self._m_y if hasattr(self, '_m_y') else None self._m_y = (self.y_int / 100000.0) return self._m_y if hasattr(self, '_m_y') else None class BkgdGreyscale(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.value = self._io.read_u2be() class ChrmChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.white_point = self._root.Point(self._io, self, self._root) self.red = self._root.Point(self._io, self, self._root) self.green = self._root.Point(self._io, self, self._root) self.blue = self._root.Point(self._io, self, self._root) class IhdrChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.width = self._io.read_u4be() self.height = self._io.read_u4be() self.bit_depth = self._io.read_u1() self.color_type = self._root.ColorType(self._io.read_u1()) self.compression_method = self._io.read_u1() self.filter_method = self._io.read_u1() self.interlace_method = self._io.read_u1() class PlteChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.entries = [] while not self._io.is_eof(): self.entries.append(self._root.Rgb(self._io, self, self._root)) class SrgbChunk(KaitaiStruct): class Intent(Enum): perceptual = 0 relative_colorimetric = 1 saturation = 2 absolute_colorimetric = 3 def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.render_intent = self._root.SrgbChunk.Intent(self._io.read_u1()) class CompressedTextChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.keyword = (self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8") self.compression_method = self._io.read_u1() self._raw_text_datastream = self._io.read_bytes_full() self.text_datastream = zlib.decompress(self._raw_text_datastream) class BkgdTruecolor(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.red = self._io.read_u2be() self.green = self._io.read_u2be() self.blue = self._io.read_u2be() class GamaChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.gamma_int = self._io.read_u4be() @property def gamma_ratio(self): if hasattr(self, '_m_gamma_ratio'): return self._m_gamma_ratio if hasattr(self, '_m_gamma_ratio') else None self._m_gamma_ratio = (100000.0 / self.gamma_int) return self._m_gamma_ratio if hasattr(self, '_m_gamma_ratio') else None class BkgdChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self _on = self._root.ihdr.color_type if _on == self._root.ColorType.greyscale_alpha: self.bkgd = self._root.BkgdGreyscale(self._io, self, self._root) elif _on == self._root.ColorType.indexed: self.bkgd = self._root.BkgdIndexed(self._io, self, self._root) elif _on == self._root.ColorType.greyscale: self.bkgd = self._root.BkgdGreyscale(self._io, self, self._root) elif _on == self._root.ColorType.truecolor_alpha: self.bkgd = self._root.BkgdTruecolor(self._io, self, self._root) elif _on == self._root.ColorType.truecolor: self.bkgd = self._root.BkgdTruecolor(self._io, self, self._root) class PhysChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.pixels_per_unit_x = self._io.read_u4be() self.pixels_per_unit_y = self._io.read_u4be() self.unit = self._root.PhysUnit(self._io.read_u1()) class InternationalTextChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.keyword = (self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8") self.compression_flag = self._io.read_u1() self.compression_method = self._io.read_u1() self.language_tag = (self._io.read_bytes_term(0, False, True, True)).decode(u"ASCII") self.translated_keyword = (self._io.read_bytes_term(0, False, True, True)).decode(u"UTF-8") self.text = (self._io.read_bytes_full()).decode(u"UTF-8") class TextChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.keyword = (self._io.read_bytes_term(0, False, True, True)).decode(u"iso8859-1") self.text = (self._io.read_bytes_full()).decode(u"iso8859-1") class TimeChunk(KaitaiStruct): def __init__(self, _io, _parent=None, _root=None): self._io = _io self._parent = _parent self._root = _root if _root else self self.year = self._io.read_u2be() self.month = self._io.read_u1() self.day = self._io.read_u1() self.hour = self._io.read_u1() self.minute = self._io.read_u1() self.second = self._io.read_u1()