class BasicIFDEntry(FieldSet):
TYPE_BYTE = 0
TYPE_UNDEFINED = 7
TYPE_RATIONAL = 5
TYPE_SIGNED_RATIONAL = 10
TYPE_INFO = {
1: (UInt8, "BYTE (8 bits)"),
2: (ASCIIString, "ASCII (8 bits)"),
3: (UInt16, "SHORT (16 bits)"),
4: (UInt32, "LONG (32 bits)"),
5: (RationalUInt32, "RATIONAL (2x LONG, 64 bits)"),
6: (Int8, "SBYTE (8 bits)"),
7: (Bytes, "UNDEFINED (8 bits)"),
8: (Int16, "SSHORT (16 bits)"),
9: (Int32, "SLONG (32 bits)"),
10: (RationalInt32, "SRATIONAL (2x SLONG, 64 bits)"),
11: (Float32, "FLOAT (32 bits)"),
12: (Float64, "DOUBLE (64 bits)"),
}
ENTRY_FORMAT = createDict(TYPE_INFO, 0)
TYPE_NAME = createDict(TYPE_INFO, 1)
TAG_INFO = {}
def createFields(self):
yield IFDTag(self, "tag", "Tag")
yield Enum(UInt16(self, "type", "Type"), self.TYPE_NAME)
self.value_cls = self.ENTRY_FORMAT.get(self['type'].value, Bytes)
if issubclass(self.value_cls, Bytes):
self.value_size = 8
else:
self.value_size = self.value_cls.static_size
yield UInt32(self, "count", "Count")
count = self['count'].value
totalsize = self.value_size * count
if count == 0:
yield NullBytes(self, "padding", 4)
elif totalsize <= 32:
name = "value"
if issubclass(self.value_cls, Bytes):
yield self.value_cls(self, name, count)
elif count == 1:
yield self.value_cls(self, name)
else:
yield ValueArray(self, name, self.value_cls, count)
if totalsize < 32:
yield NullBits(self, "padding", 32 - totalsize)
else:
yield UInt32(self, "offset", "Value offset")
def createValue(self):
if "value" in self:
return self['value'].value
return None
def createDescription(self):
return "Entry: " + self["tag"].getTag()[1]
class IndexOffset(FieldSet):
TYPE_DESC = createDict(RESOURCE_TYPE, 1)
def __init__(self, parent, name, res_type=None):
FieldSet.__init__(self, parent, name)
self.res_type = res_type
def createFields(self):
if self.res_type is None:
# immediate subdirectory of the root
yield Enum(UInt32(self, "type"), self.TYPE_DESC)
else:
# sub-subdirectory, "type" field is just an ID
yield textHandler(UInt32(self, "type"), lambda field: "ID %d" % field.value)
yield Bits(self, "offset", 31)
yield Bit(self, "is_subdir")
def getResType(self):
return self["type"].value
def createDescription(self):
if self["is_subdir"].value:
return "Sub-directory: %s at %s" % (self["type"].display, self["offset"].value)
else:
return "Index: %s at %s" % (self["type"].display, self["offset"].value)
class Chunk(FieldSet):
CHUNK_INFO = {
0x0001: ("string_table", "String Table", StringChunk, None),
0x0003: ("xml_file", "XML File", Top, None),
0x0100: ("namespace_start[]", "Start Namespace", NamespaceTag,
NamespaceStartValue),
0x0101:
("namespace_end[]", "End Namespace", NamespaceTag, NamespaceEndValue),
0x0102: ("tag_start[]", "Start Tag", TagStart, TagStartValue),
0x0103: ("tag_end[]", "End Tag", TagEnd, TagEndValue),
0x0104: ("text[]", "Text", TextChunk, None),
0x0180: ("resource_ids", "Resource IDs", ResourceIDs, None),
}
CHUNK_DESC = createDict(CHUNK_INFO, 1)
def __init__(self, parent, name, description=None):
FieldSet.__init__(self, parent, name, description)
self._size = self['chunk_size'].value * 8
type = self['type'].value
self.parse_func = None
if type in self.CHUNK_INFO:
self._name, self._description, self.parse_func, value_func = self.CHUNK_INFO[
type]
if value_func:
self.createValue = lambda: value_func(self)
def createFields(self):
yield Enum(UInt16(self, "type"), self.CHUNK_DESC)
yield UInt16(self, "header_size")
yield UInt32(self, "chunk_size")
if self.parse_func:
for field in self.parse_func(self):
yield field
class XMLAttribute(FieldSet):
TYPE_INFO = {
0: ('Null', IntTextHandler(lambda field: '')),
1: ('Reference', IntTextHandler(lambda field: '@%08x' % field.value)),
2: ('Attribute', IntTextHandler(lambda field: '?%08x' % field.value)),
3: ('String', IntTextHandler(stringIndex)),
4: ('Float', Float32),
5: ('Dimension', XMLDimensionFloat),
6: ('Fraction', XMLFractionFloat),
16: ('Int_Dec', Int32),
17: ('Int_Hex', IntTextHandler(hexadecimal)),
18: ('Int_Boolean', IntTextHandler(booleanText)),
28: ('Int_Color_Argb8',
IntTextHandler(lambda field: '#%08x' % field.value)),
29: ('Int_Color_Rgb8',
IntTextHandler(lambda field: '#%08x' % field.value)),
30: ('Int_Color_Argb4',
IntTextHandler(lambda field: '#%08x' % field.value)),
31: ('Int_Color_Rgb4',
IntTextHandler(lambda field: '#%08x' % field.value)),
}
TYPE_NAME = createDict(TYPE_INFO, 0)
TYPE_FUNC = createDict(TYPE_INFO, 1)
static_size = 5 * 32
def createFields(self):
yield textHandler(Int32(self, "ns"), stringIndex)
yield textHandler(Int32(self, "name"), stringIndex)
yield textHandler(Int32(self, "value_string"), stringIndex)
yield UInt16(self, "unk[]")
yield UInt8(self, "unk[]")
yield Enum(UInt8(self, "value_type"), self.TYPE_NAME)
func = self.TYPE_FUNC.get(self['value_type'].value, None)
if not func:
func = UInt32
yield func(self, "value_data")
def createValue(self):
return (self['name'].display, self['value_data'].value)
def createDisplay(self):
return '%s="%s"' % (self['name'].display, self['value_data'].display)
class Layer2(Layer):
PROTO_INFO = {
0x0800: ("ipv4", IPv4, "IPv4"),
0x0806: ("arp", ARP, "ARP"),
0x86dd: ("ipv6", IPv6, "IPv6"),
}
PROTO_DESC = createDict(PROTO_INFO, 2)
def parseNext(self, parent):
try:
name, parser, desc = self.PROTO_INFO[self["protocol"].value]
return parser(parent, name)
except KeyError:
return None
class IP(Layer):
PROTOCOL_INFO = {
1: ("icmp", ICMP, "ICMP"),
6: ("tcp", TCP, "TCP"),
17: ("udp", UDP, "UDP"),
58: ("icmpv6", ICMPv6, "ICMPv6"),
60: ("ipv6_opts", None, "IPv6 destination option"),
}
PROTOCOL_NAME = createDict(PROTOCOL_INFO, 2)
def parseNext(self, parent):
proto = self["protocol"].value
if proto not in self.PROTOCOL_INFO:
return None
name, parser, desc = self.PROTOCOL_INFO[proto]
if not parser:
return None
return parser(parent, name)
class MetadataBlock(FieldSet):
"Metadata block field: http://flac.sourceforge.net/format.html#metadata_block"
BLOCK_TYPES = {
0: ("stream_info", u"Stream info", StreamInfo),
1: ("padding[]", u"Padding", None),
2: ("application[]", u"Application", None),
3: ("seek_table", u"Seek table", SeekTable),
4: ("comment", u"Vorbis comment", VorbisComment),
5: ("cue_sheet[]", u"Cue sheet", None),
6: ("picture[]", u"Picture", None),
}
BLOCK_TYPE_DESC = createDict(BLOCK_TYPES, 1)
def __init__(self, *args, **kw):
FieldSet.__init__(self, *args, **kw)
self._size = 32 + self["metadata_length"].value * 8
try:
key = self["block_type"].value
self._name, self._description, self.handler = self.BLOCK_TYPES[key]
except KeyError:
self.handler = None
def createFields(self):
yield Bit(self, "last_metadata_block", "True if this is the last metadata block")
yield Enum(Bits(self, "block_type", 7, "Metadata block header type"), self.BLOCK_TYPE_DESC)
yield UInt24(self, "metadata_length", "Length of following metadata in bytes (doesn't include this header)")
block_type = self["block_type"].value
size = self["metadata_length"].value
if not size:
return
try:
handler = self.BLOCK_TYPES[block_type][2]
except KeyError:
handler = None
if handler:
yield handler(self, "content", size=size * 8)
elif self["block_type"].value == 1:
yield NullBytes(self, "padding", size)
else:
yield RawBytes(self, "rawdata", size)
class TcpdumpFile(Parser):
PARSER_TAGS = {
"id": "tcpdump",
"category": "misc",
"min_size": 24 * 8,
"description": "Tcpdump file (network)",
"magic": (("\xd4\xc3\xb2\xa1", 0), ),
}
endian = LITTLE_ENDIAN
LINK_TYPE = {
1: ("ethernet", Ethernet),
113: ("unicast", Unicast),
}
LINK_TYPE_DESC = createDict(LINK_TYPE, 0)
def validate(self):
if self["id"].value != "\xd4\xc3\xb2\xa1":
return "Wrong file signature"
if self["link_type"].value not in self.LINK_TYPE:
return "Unknown link type"
return True
def createFields(self):
yield Bytes(self, "id", 4, "Tcpdump identifier")
yield UInt16(self, "maj_ver", "Major version")
yield UInt16(self, "min_ver", "Minor version")
yield Int32(self, "this_zone", "GMT to local time zone correction")
yield Int32(self, "sigfigs", "accuracy of timestamps")
yield UInt32(self, "snap_len", "max length saved portion of each pkt")
yield Enum(UInt32(self, "link_type", "data link type"),
self.LINK_TYPE_DESC)
link = self["link_type"].value
if link not in self.LINK_TYPE:
raise ParserError("Unknown link type: %s" % link)
name, parser = self.LINK_TYPE[link]
while self.current_size < self.size:
yield Packet(self, "packet[]", parser, name)
from hachoir_py2.parser import Parser
from hachoir_py2.field import (FieldSet, UInt8, UInt24, UInt32, NullBits,
NullBytes, Bit, Bits, String, RawBytes, Enum)
from hachoir_py2.core.endian import BIG_ENDIAN
from hachoir_py2.parser.audio.mpeg_audio import Frame
from hachoir_py2.parser.video.amf import AMFObject
from hachoir_py2.core.tools import createDict
SAMPLING_RATE = {
0: (5512, "5.5 kHz"),
1: (11025, "11 kHz"),
2: (22050, "22.1 kHz"),
3: (44100, "44.1 kHz"),
}
SAMPLING_RATE_VALUE = createDict(SAMPLING_RATE, 0)
SAMPLING_RATE_TEXT = createDict(SAMPLING_RATE, 1)
AUDIO_CODEC_MP3 = 2
AUDIO_CODEC_NAME = {
0: u"Uncompressed",
1: u"ADPCM",
2: u"MP3",
5: u"Nellymoser 8kHz mono",
6: u"Nellymoser",
}
VIDEO_CODEC_NAME = {
2: u"Sorensen H.263",
3: u"Screen video",
4: u"On2 VP6",
class AuFile(Parser):
PARSER_TAGS = {
"id": "sun_next_snd",
"category": "audio",
"file_ext": ("au", "snd"),
"mime": (u"audio/basic", ),
"min_size": 24 * 8,
"magic": ((".snd", 0), ),
"description": "Sun/NeXT audio"
}
endian = BIG_ENDIAN
CODEC_INFO = {
1: (8, u"8-bit ISDN u-law"),
2: (8, u"8-bit linear PCM"),
3: (16, u"16-bit linear PCM"),
4: (24, u"24-bit linear PCM"),
5: (32, u"32-bit linear PCM"),
6: (32, u"32-bit IEEE floating point"),
7: (64, u"64-bit IEEE floating point"),
8: (None, u"Fragmented sample data"),
9: (None, u"DSP program"),
10: (8, u"8-bit fixed point"),
11: (16, u"16-bit fixed point"),
12: (24, u"24-bit fixed point"),
13: (32, u"32-bit fixed point"),
18: (16, u"16-bit linear with emphasis"),
19: (16, u"16-bit linear compressed"),
20: (16, u"16-bit linear with emphasis and compression"),
21: (None, u"Music kit DSP commands"),
23: (None, u"4-bit ISDN u-law compressed (CCITT G.721 ADPCM)"),
24: (None, u"ITU-T G.722 ADPCM"),
25: (None, u"ITU-T G.723 3-bit ADPCM"),
26: (None, u"ITU-T G.723 5-bit ADPCM"),
27: (8, u"8-bit ISDN A-law"),
}
# Create bit rate and codec name dictionnaries
BITS_PER_SAMPLE = createDict(CODEC_INFO, 0)
CODEC_NAME = createDict(CODEC_INFO, 1)
VALID_NB_CHANNEL = set((1, 2)) # FIXME: 4, 5, 7, 8 channels are supported?
def validate(self):
if self.stream.readBytes(0, 4) != ".snd":
return "Wrong file signature"
if self["channels"].value not in self.VALID_NB_CHANNEL:
return "Invalid number of channel"
return True
def getBitsPerSample(self):
"""
Get bit rate (number of bit per sample per channel),
may returns None if you unable to compute it.
"""
return self.BITS_PER_SAMPLE.get(self["codec"].value)
def createFields(self):
yield String(self,
"signature",
4,
'Format signature (".snd")',
charset="ASCII")
yield UInt32(self, "data_ofs", "Data offset")
yield filesizeHandler(UInt32(self, "data_size", "Data size"))
yield Enum(UInt32(self, "codec", "Audio codec"), self.CODEC_NAME)
yield displayHandler(
UInt32(self, "sample_rate", "Number of samples/second"),
humanFrequency)
yield UInt32(self, "channels", "Number of interleaved channels")
size = self["data_ofs"].value - self.current_size // 8
if 0 < size:
yield String(self,
"info",
size,
"Information",
strip=" \0",
charset="ISO-8859-1")
size = min(self["data_size"].value,
(self.size - self.current_size) // 8)
yield RawBytes(self, "audio_data", size, "Audio data")
def createContentSize(self):
return (self["data_ofs"].value + self["data_size"].value) * 8
0x0538: ("POLYPOLYGON", u"Draw multiple polygons", None),
0x0548: ("EXTFLOODFILL", u"Extend flood fill", None),
0x061C: ("ROUNDRECT", u"Draw a rounded rectangle", None),
0x061D: ("PATBLT", u"Pattern blitting", None),
0x0626: ("ESCAPE", u"Escape", None),
0x06FF: ("CREATEREGION", u"Create region", None),
0x0817: ("ARC", u"Draw an arc", None),
0x081A: ("PIE", u"Draw a pie", None),
0x0830: ("CHORD", u"Draw a chord", None),
0x0940: ("DIBBITBLT", u"DIB bit blitting", None),
0x0a32: ("EXTTEXTOUT", u"Draw text (extra)", None),
0x0b41: ("DIBSTRETCHBLT", u"DIB stretch blitting", None),
0x0d33: ("SETDIBTODEV", u"Set DIB to device", None),
0x0f43: ("STRETCHDIB", u"Stretch DIB", None),
}
META_NAME = createDict(META, 0)
META_DESC = createDict(META, 1)
# ----------------------------------------------------------------------------
# EMF constants
# EMF mapping modes
EMF_MAPPING_MODE = {
1: "TEXT",
2: "LOMETRIC",
3: "HIMETRIC",
4: "LOENGLISH",
5: "HIENGLISH",
6: "TWIPS",
7: "ISOTROPIC",
8: "ANISOTROPIC",
class Command(FieldSet):
COMMAND = {}
for channel in xrange(16):
COMMAND[0x80 + channel] = ("Note off (channel %u)" % channel,
parseNote)
COMMAND[0x90 + channel] = ("Note on (channel %u)" % channel, parseNote)
COMMAND[0xA0 + channel] = ("Key after-touch (channel %u)" % channel,
parseNote)
COMMAND[0xB0 + channel] = ("Control change (channel %u)" % channel,
parseControl)
COMMAND[0xC0 + channel] = ("Program (patch) change (channel %u)" %
channel, parsePatch)
COMMAND[0xD0 + channel] = ("Channel after-touch (channel %u)" %
channel, parseChannel)
COMMAND[0xE0 + channel] = ("Pitch wheel change (channel %u)" % channel,
parsePitch)
COMMAND_DESC = createDict(COMMAND, 0)
COMMAND_PARSER = createDict(COMMAND, 1)
META_COMMAND_TEXT = 1
META_COMMAND_NAME = 3
META_COMMAND = {
0x00: ("Sets the track's sequence number", None),
0x01: ("Text event", parseText),
0x02: ("Copyright info", parseText),
0x03: ("Sequence or Track name", parseText),
0x04: ("Track instrument name", parseText),
0x05: ("Lyric", parseText),
0x06: ("Marker", parseText),
0x07: ("Cue point", parseText),
0x20: ("MIDI Channel Prefix", parseChannel),
0x2F: ("End of the track", None),
0x51: ("Set tempo", parseTempo),
0x54: ("SMPTE offset", parseSMPTEOffset),
0x58: ("Time Signature", parseTimeSignature),
0x59: ("Key signature", None),
0x7F: ("Sequencer specific information", None),
}
META_COMMAND_DESC = createDict(META_COMMAND, 0)
META_COMMAND_PARSER = createDict(META_COMMAND, 1)
def __init__(self, *args, **kwargs):
if 'prev_command' in kwargs:
self.prev_command = kwargs['prev_command']
del kwargs['prev_command']
else:
self.prev_command = None
self.command = None
FieldSet.__init__(self, *args, **kwargs)
def createFields(self):
yield Integer(self, "time", "Delta time in ticks")
next = self.stream.readBits(self.absolute_address + self.current_size,
8, self.root.endian)
if next & 0x80 == 0:
# "Running Status" command
if self.prev_command is None:
raise ParserError(
"Running Status command not preceded by another command.")
self.command = self.prev_command.command
else:
yield Enum(textHandler(UInt8(self, "command"), hexadecimal),
self.COMMAND_DESC)
self.command = self["command"].value
if self.command == 0xFF:
yield Enum(textHandler(UInt8(self, "meta_command"), hexadecimal),
self.META_COMMAND_DESC)
yield UInt8(self, "data_len")
size = self["data_len"].value
if size:
command = self["meta_command"].value
if command in self.META_COMMAND_PARSER:
parser = self.META_COMMAND_PARSER[command]
else:
parser = None
if parser:
for field in parser(self, size):
yield field
else:
yield RawBytes(self, "data", size)
else:
if self.command not in self.COMMAND_PARSER:
raise ParserError("Unknown command: %s" %
self["command"].display)
parser = self.COMMAND_PARSER[self.command]
for field in parser(self):
yield field
def createDescription(self):
if "meta_command" in self:
return self["meta_command"].display
else:
return self.COMMAND_DESC[self.command]
class Object(FieldSet):
TYPE_INFO = {
0: ("end[]", None, "End (reserved for BER, None)",
None), # TODO: Write parser
1: ("boolean[]", readBoolean, "Boolean", None),
2: ("integer[]", readInteger, "Integer", None),
3: ("bit_str[]", readBitString, "Bit string", None),
4: ("octet_str[]", readOctetString, "Octet string", None),
5: ("null[]", None, "NULL (empty, None)", None),
6: ("obj_id[]", readObjectID, "Object identifier", formatObjectID),
7:
("obj_desc[]", None, "Object descriptor", None), # TODO: Write parser
8: ("external[]", None, "External, instance of",
None), # TODO: Write parser # External?
9:
("real[]", readASCIIString, "Real number", None), # TODO: Write parser
10: ("enum[]", readInteger, "Enumerated", None),
11: ("embedded[]", None, "Embedded PDV", None), # TODO: Write parser
12: ("utf8_str[]", readUTF8String, "Printable string", None),
13: ("rel_obj_id[]", None, "Relative object identifier",
None), # TODO: Write parser
14: ("time[]", None, "Time", None), # TODO: Write parser
# 15: invalid??? sequence of???
16: ("seq[]", readSequence, "Sequence", None),
17: ("set[]", readSet, "Set", None),
18: ("num_str[]", readASCIIString, "Numeric string", None),
19: ("print_str[]", readASCIIString, "Printable string", formatValue),
20:
("teletex_str[]", readASCIIString, "Teletex (T61, None) string", None),
21: ("videotex_str[]", readASCIIString, "Videotex string", None),
22: ("ia5_str[]", readASCIIString, "IA5 string", formatValue),
23: ("utc_time[]", readASCIIString, "UTC time", formatUTCTime),
24: ("general_time[]", readASCIIString, "Generalized time", None),
25: ("graphic_str[]", readASCIIString, "Graphic string", None),
26: ("visible_str[]", readASCIIString, "Visible (ISO64, None) string",
None),
27: ("general_str[]", readASCIIString, "General string", None),
28: ("universal_str[]", readASCIIString, "Universal string", None),
29:
("unrestricted_str[]", readASCIIString, "Unrestricted string", None),
30: ("bmp_str[]", readBMPString, "BMP string", None),
# 31: multiple octet tag number, TODO: not supported
# Extended tag values:
# 31: Date
# 32: Time of day
# 33: Date-time
# 34: Duration
}
TYPE_DESC = createDict(TYPE_INFO, 2)
CLASS_DESC = {0: "universal", 1: "application", 2: "context", 3: "private"}
FORM_DESC = {False: "primitive", True: "constructed"}
def __init__(self, *args, **kw):
FieldSet.__init__(self, *args, **kw)
key = self["type"].value & 31
if self['class'].value == 0:
# universal object
if key in self.TYPE_INFO:
self._name, self._handler, self._description, create_desc = self.TYPE_INFO[
key]
if create_desc:
self.createDescription = lambda: "%s: %s" % (
self.TYPE_INFO[key][2], create_desc(self))
self._description = None
elif key == 31:
raise ParserError(
"ASN.1 Object: tag bigger than 30 are not supported")
else:
self._handler = None
elif self['form'].value:
# constructed: treat as sequence
self._name = 'seq[]'
self._handler = readSequence
self._description = 'constructed object type %i' % key
else:
# primitive, context/private
self._name = 'raw[]'
self._handler = readASCIIString
self._description = '%s object type %i' % (self['class'].display,
key)
field = self["size"]
self._size = field.address + field.size + field.value * 8
def createFields(self):
yield Enum(Bits(self, "class", 2), self.CLASS_DESC)
yield Enum(Bit(self, "form"), self.FORM_DESC)
if self['class'].value == 0:
yield Enum(Bits(self, "type", 5), self.TYPE_DESC)
else:
yield Bits(self, "type", 5)
yield ASNInteger(self, "size", "Size in bytes")
size = self["size"].value
if size:
if self._handler:
for field in self._handler(self, size):
yield field
else:
yield RawBytes(self, "raw", size)
class Photoshop8BIM(FieldSet):
TAG_INFO = {
0x03ed: ("res_info", ResolutionInfo, "Resolution information"),
0x03f3: ("print_flag", PrintFlags, "Print flags: labels, crop marks, colour bars, etc."),
0x03f5: ("col_half_info", None, "Colour half-toning information"),
0x03f8: ("color_trans_func", None, "Colour transfer function"),
0x0404: ("iptc", IPTC, "IPTC/NAA"),
0x0406: ("jpeg_qual", None, "JPEG quality"),
0x0408: ("grid_guide", GridGuides, "Grid guides informations"),
0x0409: ("thumb_res", Thumbnail, "Thumbnail resource (PS 4.0)"),
0x0410: ("watermark", UInt8, "Watermark"),
0x040a: ("copyright_flag", UInt8, "Copyright flag"),
0x040b: ("url", None, "URL"),
0x040c: ("thumb_res2", Thumbnail, "Thumbnail resource (PS 5.0)"),
0x040d: ("glob_angle", UInt32, "Global lighting angle for effects"),
0x0411: ("icc_tagged", None, "ICC untagged (1 means intentionally untagged)"),
0x0414: ("base_layer_id", UInt32, "Base value for new layers ID's"),
0x0416: ("indexed_colors", UInt16, "Number of colors in table that are actually defined"),
0x0417: ("transparency_index", UInt16, "Index of transparent color"),
0x0419: ("glob_altitude", UInt32, "Global altitude"),
0x041a: ("slices", None, "Slices"),
0x041e: ("url_list", None, "Unicode URLs"),
0x0421: ("version", Version, "Version information"),
0x0425: ("caption_digest", None, "16-byte MD5 caption digest"),
0x0426: ("printscale", PrintScale, "Printer scaling"),
0x2710: ("print_flag2", PrintFlags2, "Print flags (2)"),
}
TAG_NAME = createDict(TAG_INFO, 0)
CONTENT_HANDLER = createDict(TAG_INFO, 1)
TAG_DESC = createDict(TAG_INFO, 2)
def __init__(self, *args, **kw):
FieldSet.__init__(self, *args, **kw)
try:
self._name, self.handler, self._description = self.TAG_INFO[self["tag"].value]
except KeyError:
self.handler = None
size = self["size"]
self._size = size.address + size.size + alignValue(size.value, 2) * 8
def createFields(self):
yield String(self, "signature", 4, "8BIM signature", charset="ASCII")
if self["signature"].value != "8BIM":
raise ParserError("Stream doesn't look like 8BIM item (wrong signature)!")
yield textHandler(UInt16(self, "tag"), hexadecimal)
if self.stream.readBytes(self.absolute_address + self.current_size, 4) != "\0\0\0\0":
yield PascalString8(self, "name")
size = 2 + (self["name"].size // 8) % 2
yield NullBytes(self, "name_padding", size)
else:
yield String(self, "name", 4, strip="\0")
yield UInt16(self, "size")
size = alignValue(self["size"].value, 2)
if not size:
return
if self.handler:
if issubclass(self.handler, FieldSet):
yield self.handler(self, "content", size=size * 8)
else:
yield self.handler(self, "content")
else:
yield RawBytes(self, "content", size)