diff options
| author | Xusheng <xusheng@vector35.com> | 2021-07-01 12:34:30 +0800 |
|---|---|---|
| committer | Xusheng Li <xushengli@protonmail.com> | 2021-07-05 10:11:47 +0800 |
| commit | 13ff200ba134b8704f37eca99c42b70dab0d17dc (patch) | |
| tree | 876b3db3c53f704b31152aeaede1f2edc9d27b24 /python/examples/kaitai/gif.py | |
| parent | 4039a800349dcd587833d3e27d9137e4649818f4 (diff) | |
Remove snippet and kaitai plugin. Note their individual links.
Diffstat (limited to 'python/examples/kaitai/gif.py')
| -rw-r--r-- | python/examples/kaitai/gif.py | 463 |
1 files changed, 0 insertions, 463 deletions
diff --git a/python/examples/kaitai/gif.py b/python/examples/kaitai/gif.py deleted file mode 100644 index 82cfc7b6..00000000 --- a/python/examples/kaitai/gif.py +++ /dev/null @@ -1,463 +0,0 @@ -# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild - -from pkg_resources import parse_version -from .kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO -from enum import Enum -import collections - - -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 Gif(KaitaiStruct): - """GIF (Graphics Interchange Format) is an image file format, developed - in 1987. It became popular in 1990s as one of the main image formats - used in World Wide Web. - - GIF format allows encoding of palette-based images up to 256 colors - (each of the colors can be chosen from a 24-bit RGB - colorspace). Image data stream uses LZW (LempelAAAZivAAAWelch) lossless - compression. - - Over the years, several version of the format were published and - several extensions to it were made, namely, a popular Netscape - extension that allows to store several images in one file, switching - between them, which produces crude form of animation. - - Structurally, format consists of several mandatory headers and then - a stream of blocks follows. Blocks can carry additional - metainformation or image data. - """ - - class BlockType(Enum): - extension = 33 - local_image_descriptor = 44 - end_of_file = 59 - - class ExtensionLabel(Enum): - graphic_control = 249 - comment = 254 - application = 255 - SEQ_FIELDS = ["hdr", "logical_screen_descriptor", "global_color_table", "blocks"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['hdr']['start'] = self._io.pos() - self.hdr = self._root.Header(self._io, self, self._root) - self.hdr._read() - self._debug['hdr']['end'] = self._io.pos() - self._debug['logical_screen_descriptor']['start'] = self._io.pos() - self.logical_screen_descriptor = self._root.LogicalScreenDescriptorStruct(self._io, self, self._root) - self.logical_screen_descriptor._read() - self._debug['logical_screen_descriptor']['end'] = self._io.pos() - if self.logical_screen_descriptor.has_color_table: - self._debug['global_color_table']['start'] = self._io.pos() - self._raw_global_color_table = self._io.read_bytes((self.logical_screen_descriptor.color_table_size * 3)) - io = KaitaiStream(BytesIO(self._raw_global_color_table)) - self.global_color_table = self._root.ColorTable(io, self, self._root) - self.global_color_table._read() - self._debug['global_color_table']['end'] = self._io.pos() - - self._debug['blocks']['start'] = self._io.pos() - self.blocks = [] - i = 0 - while True: - if not 'arr' in self._debug['blocks']: - self._debug['blocks']['arr'] = [] - self._debug['blocks']['arr'].append({'start': self._io.pos()}) - _t_blocks = self._root.Block(self._io, self, self._root) - _t_blocks._read() - _ = _t_blocks - self.blocks.append(_) - self._debug['blocks']['arr'][len(self.blocks) - 1]['end'] = self._io.pos() - if ((self._io.is_eof()) or (_.block_type == self._root.BlockType.end_of_file)) : - break - i += 1 - self._debug['blocks']['end'] = self._io.pos() - - class ImageData(KaitaiStruct): - """ - .. seealso:: - - section 22 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt - """ - SEQ_FIELDS = ["lzw_min_code_size", "subblocks"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['lzw_min_code_size']['start'] = self._io.pos() - self.lzw_min_code_size = self._io.read_u1() - self._debug['lzw_min_code_size']['end'] = self._io.pos() - self._debug['subblocks']['start'] = self._io.pos() - self.subblocks = self._root.Subblocks(self._io, self, self._root) - self.subblocks._read() - self._debug['subblocks']['end'] = self._io.pos() - - - class ColorTableEntry(KaitaiStruct): - SEQ_FIELDS = ["red", "green", "blue"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['red']['start'] = self._io.pos() - self.red = self._io.read_u1() - self._debug['red']['end'] = self._io.pos() - self._debug['green']['start'] = self._io.pos() - self.green = self._io.read_u1() - self._debug['green']['end'] = self._io.pos() - self._debug['blue']['start'] = self._io.pos() - self.blue = self._io.read_u1() - self._debug['blue']['end'] = self._io.pos() - - - class LogicalScreenDescriptorStruct(KaitaiStruct): - """ - .. seealso:: - - section 18 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt - """ - SEQ_FIELDS = ["screen_width", "screen_height", "flags", "bg_color_index", "pixel_aspect_ratio"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['screen_width']['start'] = self._io.pos() - self.screen_width = self._io.read_u2le() - self._debug['screen_width']['end'] = self._io.pos() - self._debug['screen_height']['start'] = self._io.pos() - self.screen_height = self._io.read_u2le() - self._debug['screen_height']['end'] = self._io.pos() - self._debug['flags']['start'] = self._io.pos() - self.flags = self._io.read_u1() - self._debug['flags']['end'] = self._io.pos() - self._debug['bg_color_index']['start'] = self._io.pos() - self.bg_color_index = self._io.read_u1() - self._debug['bg_color_index']['end'] = self._io.pos() - self._debug['pixel_aspect_ratio']['start'] = self._io.pos() - self.pixel_aspect_ratio = self._io.read_u1() - self._debug['pixel_aspect_ratio']['end'] = self._io.pos() - - @property - def has_color_table(self): - if hasattr(self, '_m_has_color_table'): - return self._m_has_color_table if hasattr(self, '_m_has_color_table') else None - - self._m_has_color_table = (self.flags & 128) != 0 - return self._m_has_color_table if hasattr(self, '_m_has_color_table') else None - - @property - def color_table_size(self): - if hasattr(self, '_m_color_table_size'): - return self._m_color_table_size if hasattr(self, '_m_color_table_size') else None - - self._m_color_table_size = (2 << (self.flags & 7)) - return self._m_color_table_size if hasattr(self, '_m_color_table_size') else None - - - class LocalImageDescriptor(KaitaiStruct): - SEQ_FIELDS = ["left", "top", "width", "height", "flags", "local_color_table", "image_data"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['left']['start'] = self._io.pos() - self.left = self._io.read_u2le() - self._debug['left']['end'] = self._io.pos() - self._debug['top']['start'] = self._io.pos() - self.top = self._io.read_u2le() - self._debug['top']['end'] = self._io.pos() - self._debug['width']['start'] = self._io.pos() - self.width = self._io.read_u2le() - self._debug['width']['end'] = self._io.pos() - self._debug['height']['start'] = self._io.pos() - self.height = self._io.read_u2le() - self._debug['height']['end'] = self._io.pos() - self._debug['flags']['start'] = self._io.pos() - self.flags = self._io.read_u1() - self._debug['flags']['end'] = self._io.pos() - if self.has_color_table: - self._debug['local_color_table']['start'] = self._io.pos() - self._raw_local_color_table = self._io.read_bytes((self.color_table_size * 3)) - io = KaitaiStream(BytesIO(self._raw_local_color_table)) - self.local_color_table = self._root.ColorTable(io, self, self._root) - self.local_color_table._read() - self._debug['local_color_table']['end'] = self._io.pos() - - self._debug['image_data']['start'] = self._io.pos() - self.image_data = self._root.ImageData(self._io, self, self._root) - self.image_data._read() - self._debug['image_data']['end'] = self._io.pos() - - @property - def has_color_table(self): - if hasattr(self, '_m_has_color_table'): - return self._m_has_color_table if hasattr(self, '_m_has_color_table') else None - - self._m_has_color_table = (self.flags & 128) != 0 - return self._m_has_color_table if hasattr(self, '_m_has_color_table') else None - - @property - def has_interlace(self): - if hasattr(self, '_m_has_interlace'): - return self._m_has_interlace if hasattr(self, '_m_has_interlace') else None - - self._m_has_interlace = (self.flags & 64) != 0 - return self._m_has_interlace if hasattr(self, '_m_has_interlace') else None - - @property - def has_sorted_color_table(self): - if hasattr(self, '_m_has_sorted_color_table'): - return self._m_has_sorted_color_table if hasattr(self, '_m_has_sorted_color_table') else None - - self._m_has_sorted_color_table = (self.flags & 32) != 0 - return self._m_has_sorted_color_table if hasattr(self, '_m_has_sorted_color_table') else None - - @property - def color_table_size(self): - if hasattr(self, '_m_color_table_size'): - return self._m_color_table_size if hasattr(self, '_m_color_table_size') else None - - self._m_color_table_size = (2 << (self.flags & 7)) - return self._m_color_table_size if hasattr(self, '_m_color_table_size') else None - - - class Block(KaitaiStruct): - SEQ_FIELDS = ["block_type", "body"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['block_type']['start'] = self._io.pos() - self.block_type = KaitaiStream.resolve_enum(self._root.BlockType, self._io.read_u1()) - self._debug['block_type']['end'] = self._io.pos() - self._debug['body']['start'] = self._io.pos() - _on = self.block_type - if _on == self._root.BlockType.extension: - self.body = self._root.Extension(self._io, self, self._root) - self.body._read() - elif _on == self._root.BlockType.local_image_descriptor: - self.body = self._root.LocalImageDescriptor(self._io, self, self._root) - self.body._read() - self._debug['body']['end'] = self._io.pos() - - - class ColorTable(KaitaiStruct): - """ - .. seealso:: - - section 19 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt - """ - SEQ_FIELDS = ["entries"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['entries']['start'] = self._io.pos() - self.entries = [] - i = 0 - while not self._io.is_eof(): - if not 'arr' in self._debug['entries']: - self._debug['entries']['arr'] = [] - self._debug['entries']['arr'].append({'start': self._io.pos()}) - _t_entries = self._root.ColorTableEntry(self._io, self, self._root) - _t_entries._read() - self.entries.append(_t_entries) - self._debug['entries']['arr'][len(self.entries) - 1]['end'] = self._io.pos() - i += 1 - - self._debug['entries']['end'] = self._io.pos() - - - class Header(KaitaiStruct): - """ - .. seealso:: - - section 17 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt - """ - SEQ_FIELDS = ["magic", "version"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['magic']['start'] = self._io.pos() - self.magic = self._io.ensure_fixed_contents(b"\x47\x49\x46") - self._debug['magic']['end'] = self._io.pos() - self._debug['version']['start'] = self._io.pos() - self.version = (self._io.read_bytes(3)).decode(u"ASCII") - self._debug['version']['end'] = self._io.pos() - - - class ExtGraphicControl(KaitaiStruct): - """ - .. seealso:: - - section 23 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt - """ - SEQ_FIELDS = ["block_size", "flags", "delay_time", "transparent_idx", "terminator"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['block_size']['start'] = self._io.pos() - self.block_size = self._io.ensure_fixed_contents(b"\x04") - self._debug['block_size']['end'] = self._io.pos() - self._debug['flags']['start'] = self._io.pos() - self.flags = self._io.read_u1() - self._debug['flags']['end'] = self._io.pos() - self._debug['delay_time']['start'] = self._io.pos() - self.delay_time = self._io.read_u2le() - self._debug['delay_time']['end'] = self._io.pos() - self._debug['transparent_idx']['start'] = self._io.pos() - self.transparent_idx = self._io.read_u1() - self._debug['transparent_idx']['end'] = self._io.pos() - self._debug['terminator']['start'] = self._io.pos() - self.terminator = self._io.ensure_fixed_contents(b"\x00") - self._debug['terminator']['end'] = self._io.pos() - - @property - def transparent_color_flag(self): - if hasattr(self, '_m_transparent_color_flag'): - return self._m_transparent_color_flag if hasattr(self, '_m_transparent_color_flag') else None - - self._m_transparent_color_flag = (self.flags & 1) != 0 - return self._m_transparent_color_flag if hasattr(self, '_m_transparent_color_flag') else None - - @property - def user_input_flag(self): - if hasattr(self, '_m_user_input_flag'): - return self._m_user_input_flag if hasattr(self, '_m_user_input_flag') else None - - self._m_user_input_flag = (self.flags & 2) != 0 - return self._m_user_input_flag if hasattr(self, '_m_user_input_flag') else None - - - class Subblock(KaitaiStruct): - SEQ_FIELDS = ["num_bytes", "bytes"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['num_bytes']['start'] = self._io.pos() - self.num_bytes = self._io.read_u1() - self._debug['num_bytes']['end'] = self._io.pos() - self._debug['bytes']['start'] = self._io.pos() - self.bytes = self._io.read_bytes(self.num_bytes) - self._debug['bytes']['end'] = self._io.pos() - - - class ExtApplication(KaitaiStruct): - SEQ_FIELDS = ["application_id", "subblocks"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['application_id']['start'] = self._io.pos() - self.application_id = self._root.Subblock(self._io, self, self._root) - self.application_id._read() - self._debug['application_id']['end'] = self._io.pos() - self._debug['subblocks']['start'] = self._io.pos() - self.subblocks = [] - i = 0 - while True: - if not 'arr' in self._debug['subblocks']: - self._debug['subblocks']['arr'] = [] - self._debug['subblocks']['arr'].append({'start': self._io.pos()}) - _t_subblocks = self._root.Subblock(self._io, self, self._root) - _t_subblocks._read() - _ = _t_subblocks - self.subblocks.append(_) - self._debug['subblocks']['arr'][len(self.subblocks) - 1]['end'] = self._io.pos() - if _.num_bytes == 0: - break - i += 1 - self._debug['subblocks']['end'] = self._io.pos() - - - class Subblocks(KaitaiStruct): - SEQ_FIELDS = ["entries"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['entries']['start'] = self._io.pos() - self.entries = [] - i = 0 - while True: - if not 'arr' in self._debug['entries']: - self._debug['entries']['arr'] = [] - self._debug['entries']['arr'].append({'start': self._io.pos()}) - _t_entries = self._root.Subblock(self._io, self, self._root) - _t_entries._read() - _ = _t_entries - self.entries.append(_) - self._debug['entries']['arr'][len(self.entries) - 1]['end'] = self._io.pos() - if _.num_bytes == 0: - break - i += 1 - self._debug['entries']['end'] = self._io.pos() - - - class Extension(KaitaiStruct): - SEQ_FIELDS = ["label", "body"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['label']['start'] = self._io.pos() - self.label = KaitaiStream.resolve_enum(self._root.ExtensionLabel, self._io.read_u1()) - self._debug['label']['end'] = self._io.pos() - self._debug['body']['start'] = self._io.pos() - _on = self.label - if _on == self._root.ExtensionLabel.application: - self.body = self._root.ExtApplication(self._io, self, self._root) - self.body._read() - elif _on == self._root.ExtensionLabel.comment: - self.body = self._root.Subblocks(self._io, self, self._root) - self.body._read() - elif _on == self._root.ExtensionLabel.graphic_control: - self.body = self._root.ExtGraphicControl(self._io, self, self._root) - self.body._read() - else: - self.body = self._root.Subblocks(self._io, self, self._root) - self.body._read() - self._debug['body']['end'] = self._io.pos() - - - |
