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

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+#
+# The Python Imaging Library.
+# $Id$
+#
+# PPM support for PIL
+#
+# History:
+#       96-03-24 fl     Created
+#       98-03-06 fl     Write RGBA images (as RGB, that is)
+#
+# Copyright (c) Secret Labs AB 1997-98.
+# Copyright (c) Fredrik Lundh 1996.
+#
+# See the README file for information on usage and redistribution.
+#
+
+
+from . import Image, ImageFile
+
+#
+# --------------------------------------------------------------------
+
+b_whitespace = b"\x20\x09\x0a\x0b\x0c\x0d"
+
+MODES = {
+    # standard
+    b"P4": "1",
+    b"P5": "L",
+    b"P6": "RGB",
+    # extensions
+    b"P0CMYK": "CMYK",
+    # PIL extensions (for test purposes only)
+    b"PyP": "P",
+    b"PyRGBA": "RGBA",
+    b"PyCMYK": "CMYK",
+}
+
+
+def _accept(prefix):
+    return prefix[0:1] == b"P" and prefix[1] in b"0456y"
+
+
+##
+# Image plugin for PBM, PGM, and PPM images.
+
+
+class PpmImageFile(ImageFile.ImageFile):
+
+    format = "PPM"
+    format_description = "Pbmplus image"
+
+    def _token(self, s=b""):
+        while True:  # read until next whitespace
+            c = self.fp.read(1)
+            if not c or c in b_whitespace:
+                break
+            if c > b"\x79":
+                raise ValueError("Expected ASCII value, found binary")
+            s = s + c
+            if len(s) > 9:
+                raise ValueError("Expected int, got > 9 digits")
+        return s
+
+    def _open(self):
+
+        # check magic
+        s = self.fp.read(1)
+        if s != b"P":
+            raise SyntaxError("not a PPM file")
+        magic_number = self._token(s)
+        mode = MODES[magic_number]
+
+        self.custom_mimetype = {
+            b"P4": "image/x-portable-bitmap",
+            b"P5": "image/x-portable-graymap",
+            b"P6": "image/x-portable-pixmap",
+        }.get(magic_number)
+
+        if mode == "1":
+            self.mode = "1"
+            rawmode = "1;I"
+        else:
+            self.mode = rawmode = mode
+
+        for ix in range(3):
+            while True:
+                while True:
+                    s = self.fp.read(1)
+                    if s not in b_whitespace:
+                        break
+                    if s == b"":
+                        raise ValueError("File does not extend beyond magic number")
+                if s != b"#":
+                    break
+                s = self.fp.readline()
+            s = int(self._token(s))
+            if ix == 0:
+                xsize = s
+            elif ix == 1:
+                ysize = s
+                if mode == "1":
+                    break
+            elif ix == 2:
+                # maxgrey
+                if s > 255:
+                    if not mode == "L":
+                        raise ValueError(f"Too many colors for band: {s}")
+                    if s < 2 ** 16:
+                        self.mode = "I"
+                        rawmode = "I;16B"
+                    else:
+                        self.mode = "I"
+                        rawmode = "I;32B"
+
+        self._size = xsize, ysize
+        self.tile = [("raw", (0, 0, xsize, ysize), self.fp.tell(), (rawmode, 0, 1))]
+
+
+#
+# --------------------------------------------------------------------
+
+
+def _save(im, fp, filename):
+    if im.mode == "1":
+        rawmode, head = "1;I", b"P4"
+    elif im.mode == "L":
+        rawmode, head = "L", b"P5"
+    elif im.mode == "I":
+        if im.getextrema()[1] < 2 ** 16:
+            rawmode, head = "I;16B", b"P5"
+        else:
+            rawmode, head = "I;32B", b"P5"
+    elif im.mode == "RGB":
+        rawmode, head = "RGB", b"P6"
+    elif im.mode == "RGBA":
+        rawmode, head = "RGB", b"P6"
+    else:
+        raise OSError(f"cannot write mode {im.mode} as PPM")
+    fp.write(head + ("\n%d %d\n" % im.size).encode("ascii"))
+    if head == b"P6":
+        fp.write(b"255\n")
+    if head == b"P5":
+        if rawmode == "L":
+            fp.write(b"255\n")
+        elif rawmode == "I;16B":
+            fp.write(b"65535\n")
+        elif rawmode == "I;32B":
+            fp.write(b"2147483648\n")
+    ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, 0, 1))])
+
+    # ALTERNATIVE: save via builtin debug function
+    # im._dump(filename)
+
+
+#
+# --------------------------------------------------------------------
+
+
+Image.register_open(PpmImageFile.format, PpmImageFile, _accept)
+Image.register_save(PpmImageFile.format, _save)
+
+Image.register_extensions(PpmImageFile.format, [".pbm", ".pgm", ".ppm", ".pnm"])
+
+Image.register_mime(PpmImageFile.format, "image/x-portable-anymap")