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87 lines
2.4 KiB
Python
87 lines
2.4 KiB
Python
"""
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Photoshop parser (.psd file).
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Creation date: 8 january 2006
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Author: Victor Stinner
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"""
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from hachoir.parser import Parser
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from hachoir.field import (FieldSet,
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UInt16, UInt32, String, NullBytes, Enum, RawBytes)
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from hachoir.core.endian import BIG_ENDIAN
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from hachoir.parser.image.photoshop_metadata import Photoshop8BIM
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class Config(FieldSet):
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def __init__(self, *args):
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FieldSet.__init__(self, *args)
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self._size = (4 + self["size"].value) * 8
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def createFields(self):
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yield UInt32(self, "size")
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while not self.eof:
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yield Photoshop8BIM(self, "item[]")
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class PsdFile(Parser):
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endian = BIG_ENDIAN
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PARSER_TAGS = {
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"id": "psd",
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"category": "image",
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"file_ext": ("psd",),
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"mime": ("image/psd", "image/photoshop", "image/x-photoshop"),
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"min_size": 4 * 8,
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"magic": ((b"8BPS\0\1", 0),),
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"description": "Photoshop (PSD) picture",
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}
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COLOR_MODE = {
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0: "Bitmap",
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1: "Grayscale",
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2: "Indexed",
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3: "RGB color",
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4: "CMYK color",
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7: "Multichannel",
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8: "Duotone",
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9: "Lab Color",
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}
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COMPRESSION_NAME = {
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0: "Raw data",
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1: "RLE",
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}
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def validate(self):
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if self.stream.readBytes(0, 4) != b"8BPS":
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return "Invalid signature"
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return True
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def createFields(self):
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yield String(self, "signature", 4, "PSD signature (8BPS)", charset="ASCII")
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yield UInt16(self, "version")
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yield NullBytes(self, "reserved[]", 6)
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yield UInt16(self, "nb_channels")
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yield UInt32(self, "width")
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yield UInt32(self, "height")
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yield UInt16(self, "depth")
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yield Enum(UInt16(self, "color_mode"), self.COLOR_MODE)
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# Mode data
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yield UInt32(self, "mode_data_size")
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size = self["mode_data_size"].value
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if size:
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yield RawBytes(self, "mode_data", size)
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# Resources
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yield Config(self, "config")
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# Reserved
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yield UInt32(self, "reserved_data_size")
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size = self["reserved_data_size"].value
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if size:
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yield RawBytes(self, "reserved_data", size)
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yield Enum(UInt16(self, "compression"), self.COMPRESSION_NAME)
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size = (self.size - self.current_size) // 8
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if size:
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yield RawBytes(self, "end", size)
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