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Diffstat (limited to 'env/lib/python3.10/site-packages/PIL/MspImagePlugin.py')
| -rw-r--r-- | env/lib/python3.10/site-packages/PIL/MspImagePlugin.py | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/env/lib/python3.10/site-packages/PIL/MspImagePlugin.py b/env/lib/python3.10/site-packages/PIL/MspImagePlugin.py deleted file mode 100644 index c4d7ddb..0000000 --- a/env/lib/python3.10/site-packages/PIL/MspImagePlugin.py +++ /dev/null @@ -1,194 +0,0 @@ -# -# The Python Imaging Library. -# -# MSP file handling -# -# This is the format used by the Paint program in Windows 1 and 2. -# -# History: -# 95-09-05 fl Created -# 97-01-03 fl Read/write MSP images -# 17-02-21 es Fixed RLE interpretation -# -# Copyright (c) Secret Labs AB 1997. -# Copyright (c) Fredrik Lundh 1995-97. -# Copyright (c) Eric Soroos 2017. -# -# See the README file for information on usage and redistribution. -# -# More info on this format: https://archive.org/details/gg243631 -# Page 313: -# Figure 205. Windows Paint Version 1: "DanM" Format -# Figure 206. Windows Paint Version 2: "LinS" Format. Used in Windows V2.03 -# -# See also: https://www.fileformat.info/format/mspaint/egff.htm - -import io -import struct - -from . import Image, ImageFile -from ._binary import i16le as i16 -from ._binary import o16le as o16 - -# -# read MSP files - - -def _accept(prefix): - return prefix[:4] in [b"DanM", b"LinS"] - - -## -# Image plugin for Windows MSP images. This plugin supports both -# uncompressed (Windows 1.0). - - -class MspImageFile(ImageFile.ImageFile): - - format = "MSP" - format_description = "Windows Paint" - - def _open(self): - - # Header - s = self.fp.read(32) - if not _accept(s): - raise SyntaxError("not an MSP file") - - # Header checksum - checksum = 0 - for i in range(0, 32, 2): - checksum = checksum ^ i16(s, i) - if checksum != 0: - raise SyntaxError("bad MSP checksum") - - self.mode = "1" - self._size = i16(s, 4), i16(s, 6) - - if s[:4] == b"DanM": - self.tile = [("raw", (0, 0) + self.size, 32, ("1", 0, 1))] - else: - self.tile = [("MSP", (0, 0) + self.size, 32, None)] - - -class MspDecoder(ImageFile.PyDecoder): - # The algo for the MSP decoder is from - # https://www.fileformat.info/format/mspaint/egff.htm - # cc-by-attribution -- That page references is taken from the - # Encyclopedia of Graphics File Formats and is licensed by - # O'Reilly under the Creative Common/Attribution license - # - # For RLE encoded files, the 32byte header is followed by a scan - # line map, encoded as one 16bit word of encoded byte length per - # line. - # - # NOTE: the encoded length of the line can be 0. This was not - # handled in the previous version of this encoder, and there's no - # mention of how to handle it in the documentation. From the few - # examples I've seen, I've assumed that it is a fill of the - # background color, in this case, white. - # - # - # Pseudocode of the decoder: - # Read a BYTE value as the RunType - # If the RunType value is zero - # Read next byte as the RunCount - # Read the next byte as the RunValue - # Write the RunValue byte RunCount times - # If the RunType value is non-zero - # Use this value as the RunCount - # Read and write the next RunCount bytes literally - # - # e.g.: - # 0x00 03 ff 05 00 01 02 03 04 - # would yield the bytes: - # 0xff ff ff 00 01 02 03 04 - # - # which are then interpreted as a bit packed mode '1' image - - _pulls_fd = True - - def decode(self, buffer): - - img = io.BytesIO() - blank_line = bytearray((0xFF,) * ((self.state.xsize + 7) // 8)) - try: - self.fd.seek(32) - rowmap = struct.unpack_from( - f"<{self.state.ysize}H", self.fd.read(self.state.ysize * 2) - ) - except struct.error as e: - raise OSError("Truncated MSP file in row map") from e - - for x, rowlen in enumerate(rowmap): - try: - if rowlen == 0: - img.write(blank_line) - continue - row = self.fd.read(rowlen) - if len(row) != rowlen: - raise OSError( - "Truncated MSP file, expected %d bytes on row %s", (rowlen, x) - ) - idx = 0 - while idx < rowlen: - runtype = row[idx] - idx += 1 - if runtype == 0: - (runcount, runval) = struct.unpack_from("Bc", row, idx) - img.write(runval * runcount) - idx += 2 - else: - runcount = runtype - img.write(row[idx : idx + runcount]) - idx += runcount - - except struct.error as e: - raise OSError(f"Corrupted MSP file in row {x}") from e - - self.set_as_raw(img.getvalue(), ("1", 0, 1)) - - return -1, 0 - - -Image.register_decoder("MSP", MspDecoder) - - -# -# write MSP files (uncompressed only) - - -def _save(im, fp, filename): - - if im.mode != "1": - raise OSError(f"cannot write mode {im.mode} as MSP") - - # create MSP header - header = [0] * 16 - - header[0], header[1] = i16(b"Da"), i16(b"nM") # version 1 - header[2], header[3] = im.size - header[4], header[5] = 1, 1 - header[6], header[7] = 1, 1 - header[8], header[9] = im.size - - checksum = 0 - for h in header: - checksum = checksum ^ h - header[12] = checksum # FIXME: is this the right field? - - # header - for h in header: - fp.write(o16(h)) - - # image body - ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 32, ("1", 0, 1))]) - - -# -# registry - -Image.register_open(MspImageFile.format, MspImageFile, _accept) -Image.register_save(MspImageFile.format, _save) - -Image.register_extension(MspImageFile.format, ".msp") |