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.venv/lib/python3.9/site-packages/PIL/XVThumbImagePlugin.py

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+#
+# The Python Imaging Library.
+# $Id$
+#
+# XV Thumbnail file handler by Charles E. "Gene" Cash
+# (gcash@magicnet.net)
+#
+# see xvcolor.c and xvbrowse.c in the sources to John Bradley's XV,
+# available from ftp://ftp.cis.upenn.edu/pub/xv/
+#
+# history:
+# 98-08-15 cec  created (b/w only)
+# 98-12-09 cec  added color palette
+# 98-12-28 fl   added to PIL (with only a few very minor modifications)
+#
+# To do:
+# FIXME: make save work (this requires quantization support)
+#
+
+from . import Image, ImageFile, ImagePalette
+from ._binary import o8
+
+_MAGIC = b"P7 332"
+
+# standard color palette for thumbnails (RGB332)
+PALETTE = b""
+for r in range(8):
+    for g in range(8):
+        for b in range(4):
+            PALETTE = PALETTE + (
+                o8((r * 255) // 7) + o8((g * 255) // 7) + o8((b * 255) // 3)
+            )
+
+
+def _accept(prefix):
+    return prefix[:6] == _MAGIC
+
+
+##
+# Image plugin for XV thumbnail images.
+
+
+class XVThumbImageFile(ImageFile.ImageFile):
+
+    format = "XVThumb"
+    format_description = "XV thumbnail image"
+
+    def _open(self):
+
+        # check magic
+        if not _accept(self.fp.read(6)):
+            raise SyntaxError("not an XV thumbnail file")
+
+        # Skip to beginning of next line
+        self.fp.readline()
+
+        # skip info comments
+        while True:
+            s = self.fp.readline()
+            if not s:
+                raise SyntaxError("Unexpected EOF reading XV thumbnail file")
+            if s[0] != 35:  # ie. when not a comment: '#'
+                break
+
+        # parse header line (already read)
+        s = s.strip().split()
+
+        self.mode = "P"
+        self._size = int(s[0]), int(s[1])
+
+        self.palette = ImagePalette.raw("RGB", PALETTE)
+
+        self.tile = [("raw", (0, 0) + self.size, self.fp.tell(), (self.mode, 0, 1))]
+
+
+# --------------------------------------------------------------------
+
+Image.register_open(XVThumbImageFile.format, XVThumbImageFile, _accept)