update demos

README.md

@@ -1,8 +1,12 @@
 # Nu plugin binary reader
 A [nushell](https://www.nushell.sh/) plugin to read binary data
 
+# Screenshots
+## Parsing png and ttf
 ![parse png and ttf](screenshots/demo.gif)
-![parse gif](examples/demo2.gif)
+
+## Download lib and parse library
+![parse gif](examples/demo3.gif)
 
 ## Prerequisite
 1. `nushell`, It's a nushell plugin, so you need it.

reader/gif.py

@@ -0,0 +1,357 @@
+# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
+
+import kaitaistruct
+from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
+from enum import Enum
+
+
+if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 9):
+ raise Exception("Incompatible Kaitai Struct Python API: 0.9 or later is required, but you have %s" % (kaitaistruct.__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 (Lempel-Ziv-Welch) 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
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.hdr = Gif.Header(self._io, self, self._root)
+ self.logical_screen_descriptor = Gif.LogicalScreenDescriptorStruct(self._io, self, self._root)
+ if self.logical_screen_descriptor.has_color_table:
+ self._raw_global_color_table = self._io.read_bytes((self.logical_screen_descriptor.color_table_size * 3))
+ _io__raw_global_color_table = KaitaiStream(BytesIO(self._raw_global_color_table))
+ self.global_color_table = Gif.ColorTable(_io__raw_global_color_table, self, self._root)
+
+ self.blocks = []
+ i = 0
+ while True:
+ _ = Gif.Block(self._io, self, self._root)
+ self.blocks.append(_)
+ if ((self._io.is_eof()) or (_.block_type == Gif.BlockType.end_of_file)) :
+ break
+ i += 1
+
+ class ImageData(KaitaiStruct):
+ """
+ .. seealso::
+ - section 22 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ """
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.lzw_min_code_size = self._io.read_u1()
+ self.subblocks = Gif.Subblocks(self._io, self, self._root)
+
+
+ class ColorTableEntry(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.red = self._io.read_u1()
+ self.green = self._io.read_u1()
+ self.blue = self._io.read_u1()
+
+
+ class LogicalScreenDescriptorStruct(KaitaiStruct):
+ """
+ .. seealso::
+ - section 18 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ """
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.screen_width = self._io.read_u2le()
+ self.screen_height = self._io.read_u2le()
+ self.flags = self._io.read_u1()
+ self.bg_color_index = self._io.read_u1()
+ self.pixel_aspect_ratio = self._io.read_u1()
+
+ @property
+ def has_color_table(self):
+ if hasattr(self, '_m_has_color_table'):
+ return self._m_has_color_table
+
+ self._m_has_color_table = (self.flags & 128) != 0
+ return getattr(self, '_m_has_color_table', None)
+
+ @property
+ def color_table_size(self):
+ if hasattr(self, '_m_color_table_size'):
+ return self._m_color_table_size
+
+ self._m_color_table_size = (2 << (self.flags & 7))
+ return getattr(self, '_m_color_table_size', None)
+
+
+ class LocalImageDescriptor(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.left = self._io.read_u2le()
+ self.top = self._io.read_u2le()
+ self.width = self._io.read_u2le()
+ self.height = self._io.read_u2le()
+ self.flags = self._io.read_u1()
+ if self.has_color_table:
+ self._raw_local_color_table = self._io.read_bytes((self.color_table_size * 3))
+ _io__raw_local_color_table = KaitaiStream(BytesIO(self._raw_local_color_table))
+ self.local_color_table = Gif.ColorTable(_io__raw_local_color_table, self, self._root)
+
+ self.image_data = Gif.ImageData(self._io, self, self._root)
+
+ @property
+ def has_color_table(self):
+ if hasattr(self, '_m_has_color_table'):
+ return self._m_has_color_table
+
+ self._m_has_color_table = (self.flags & 128) != 0
+ return getattr(self, '_m_has_color_table', None)
+
+ @property
+ def has_interlace(self):
+ if hasattr(self, '_m_has_interlace'):
+ return self._m_has_interlace
+
+ self._m_has_interlace = (self.flags & 64) != 0
+ return getattr(self, '_m_has_interlace', None)
+
+ @property
+ def has_sorted_color_table(self):
+ if hasattr(self, '_m_has_sorted_color_table'):
+ return self._m_has_sorted_color_table
+
+ self._m_has_sorted_color_table = (self.flags & 32) != 0
+ return getattr(self, '_m_has_sorted_color_table', None)
+
+ @property
+ def color_table_size(self):
+ if hasattr(self, '_m_color_table_size'):
+ return self._m_color_table_size
+
+ self._m_color_table_size = (2 << (self.flags & 7))
+ return getattr(self, '_m_color_table_size', None)
+
+
+ class Block(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.block_type = KaitaiStream.resolve_enum(Gif.BlockType, self._io.read_u1())
+ _on = self.block_type
+ if _on == Gif.BlockType.extension:
+ self.body = Gif.Extension(self._io, self, self._root)
+ elif _on == Gif.BlockType.local_image_descriptor:
+ self.body = Gif.LocalImageDescriptor(self._io, self, self._root)
+
+
+ class ColorTable(KaitaiStruct):
+ """
+ .. seealso::
+ - section 19 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ """
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.entries = []
+ i = 0
+ while not self._io.is_eof():
+ self.entries.append(Gif.ColorTableEntry(self._io, self, self._root))
+ i += 1
+
+
+
+ class Header(KaitaiStruct):
+ """
+ .. seealso::
+ - section 17 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ """
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.magic = self._io.read_bytes(3)
+ if not self.magic == b"\x47\x49\x46":
+ raise kaitaistruct.ValidationNotEqualError(b"\x47\x49\x46", self.magic, self._io, u"/types/header/seq/0")
+ self.version = (self._io.read_bytes(3)).decode(u"ASCII")
+
+
+ class ExtGraphicControl(KaitaiStruct):
+ """
+ .. seealso::
+ - section 23 - https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ """
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.block_size = self._io.read_bytes(1)
+ if not self.block_size == b"\x04":
+ raise kaitaistruct.ValidationNotEqualError(b"\x04", self.block_size, self._io, u"/types/ext_graphic_control/seq/0")
+ self.flags = self._io.read_u1()
+ self.delay_time = self._io.read_u2le()
+ self.transparent_idx = self._io.read_u1()
+ self.terminator = self._io.read_bytes(1)
+ if not self.terminator == b"\x00":
+ raise kaitaistruct.ValidationNotEqualError(b"\x00", self.terminator, self._io, u"/types/ext_graphic_control/seq/4")
+
+ @property
+ def transparent_color_flag(self):
+ if hasattr(self, '_m_transparent_color_flag'):
+ return self._m_transparent_color_flag
+
+ self._m_transparent_color_flag = (self.flags & 1) != 0
+ return getattr(self, '_m_transparent_color_flag', None)
+
+ @property
+ def user_input_flag(self):
+ if hasattr(self, '_m_user_input_flag'):
+ return self._m_user_input_flag
+
+ self._m_user_input_flag = (self.flags & 2) != 0
+ return getattr(self, '_m_user_input_flag', None)
+
+
+ class Subblock(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.len_bytes = self._io.read_u1()
+ self.bytes = self._io.read_bytes(self.len_bytes)
+
+
+ class ApplicationId(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.len_bytes = self._io.read_u1()
+ if not self.len_bytes == 11:
+ raise kaitaistruct.ValidationNotEqualError(11, self.len_bytes, self._io, u"/types/application_id/seq/0")
+ self.application_identifier = (self._io.read_bytes(8)).decode(u"ASCII")
+ self.application_auth_code = self._io.read_bytes(3)
+
+
+ class ExtApplication(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.application_id = Gif.ApplicationId(self._io, self, self._root)
+ self.subblocks = []
+ i = 0
+ while True:
+ _ = Gif.Subblock(self._io, self, self._root)
+ self.subblocks.append(_)
+ if _.len_bytes == 0:
+ break
+ i += 1
+
+
+ class Subblocks(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.entries = []
+ i = 0
+ while True:
+ _ = Gif.Subblock(self._io, self, self._root)
+ self.entries.append(_)
+ if _.len_bytes == 0:
+ break
+ i += 1
+
+
+ class Extension(KaitaiStruct):
+ def __init__(self, _io, _parent=None, _root=None):
+ self._io = _io
+ self._parent = _parent
+ self._root = _root if _root else self
+ self._read()
+
+ def _read(self):
+ self.label = KaitaiStream.resolve_enum(Gif.ExtensionLabel, self._io.read_u1())
+ _on = self.label
+ if _on == Gif.ExtensionLabel.application:
+ self.body = Gif.ExtApplication(self._io, self, self._root)
+ elif _on == Gif.ExtensionLabel.comment:
+ self.body = Gif.Subblocks(self._io, self, self._root)
+ elif _on == Gif.ExtensionLabel.graphic_control:
+ self.body = Gif.ExtGraphicControl(self._io, self, self._root)
+ else:
+ self.body = Gif.Subblocks(self._io, self, self._root)
+
+
+