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This commit is contained in:
Iliyan Angelov
2025-12-01 06:50:10 +02:00
parent 91f51bc6fe
commit 62c1fe5951
4682 changed files with 544807 additions and 31208 deletions
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140
Backend/venv/lib/python3.12/site-packages/PIL/PpmImagePlugin.py
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@@ -13,7 +13,10 @@
#
# See the README file for information on usage and redistribution.
#
from __future__ import annotations
import math
from typing import IO
from . import Image, ImageFile
from ._binary import i16be as i16
@@ -35,6 +38,7 @@ MODES = {
b"P6": "RGB",
# extensions
b"P0CMYK": "CMYK",
b"Pf": "F",
# PIL extensions (for test purposes only)
b"PyP": "P",
b"PyRGBA": "RGBA",
@@ -42,8 +46,8 @@ MODES = {
}
def _accept(prefix):
return prefix[0:1] == b"P" and prefix[1] in b"0123456y"
def _accept(prefix: bytes) -> bool:
return len(prefix) >= 2 and prefix.startswith(b"P") and prefix[1] in b"0123456fy"
##
@@ -54,7 +58,9 @@ class PpmImageFile(ImageFile.ImageFile):
format = "PPM"
format_description = "Pbmplus image"
def _read_magic(self):
def _read_magic(self) -> bytes:
assert self.fp is not None
magic = b""
# read until whitespace or longest available magic number
for _ in range(6):
@@ -64,7 +70,9 @@ class PpmImageFile(ImageFile.ImageFile):
magic += c
return magic
def _read_token(self):
def _read_token(self) -> bytes:
assert self.fp is not None
token = b""
while len(token) <= 10: # read until next whitespace or limit of 10 characters
c = self.fp.read(1)
@@ -86,17 +94,20 @@ class PpmImageFile(ImageFile.ImageFile):
msg = "Reached EOF while reading header"
raise ValueError(msg)
elif len(token) > 10:
msg = f"Token too long in file header: {token.decode()}"
raise ValueError(msg)
msg_too_long = b"Token too long in file header: %s" % token
raise ValueError(msg_too_long)
return token
def _open(self):
def _open(self) -> None:
assert self.fp is not None
magic_number = self._read_magic()
try:
mode = MODES[magic_number]
except KeyError:
msg = "not a PPM file"
raise SyntaxError(msg)
self._mode = mode
if magic_number in (b"P1", b"P4"):
self.custom_mimetype = "image/x-portable-bitmap"
@@ -105,40 +116,44 @@ class PpmImageFile(ImageFile.ImageFile):
elif magic_number in (b"P3", b"P6"):
self.custom_mimetype = "image/x-portable-pixmap"
maxval = None
self._size = int(self._read_token()), int(self._read_token())
decoder_name = "raw"
if magic_number in (b"P1", b"P2", b"P3"):
decoder_name = "ppm_plain"
for ix in range(3):
token = int(self._read_token())
if ix == 0: # token is the x size
xsize = token
elif ix == 1: # token is the y size
ysize = token
if mode == "1":
self._mode = "1"
rawmode = "1;I"
break
else:
self._mode = rawmode = mode
elif ix == 2: # token is maxval
maxval = token
if not 0 < maxval < 65536:
msg = "maxval must be greater than 0 and less than 65536"
raise ValueError(msg)
if maxval > 255 and mode == "L":
self._mode = "I"
if decoder_name != "ppm_plain":
# If maxval matches a bit depth, use the raw decoder directly
if maxval == 65535 and mode == "L":
rawmode = "I;16B"
elif maxval != 255:
decoder_name = "ppm"
args: str | tuple[str | int, ...]
if mode == "1":
args = "1;I"
elif mode == "F":
scale = float(self._read_token())
if scale == 0.0 or not math.isfinite(scale):
msg = "scale must be finite and non-zero"
raise ValueError(msg)
self.info["scale"] = abs(scale)
args = (rawmode, 0, 1) if decoder_name == "raw" else (rawmode, maxval)
self._size = xsize, ysize
self.tile = [(decoder_name, (0, 0, xsize, ysize), self.fp.tell(), args)]
rawmode = "F;32F" if scale < 0 else "F;32BF"
args = (rawmode, 0, -1)
else:
maxval = int(self._read_token())
if not 0 < maxval < 65536:
msg = "maxval must be greater than 0 and less than 65536"
raise ValueError(msg)
if maxval > 255 and mode == "L":
self._mode = "I"
rawmode = mode
if decoder_name != "ppm_plain":
# If maxval matches a bit depth, use the raw decoder directly
if maxval == 65535 and mode == "L":
rawmode = "I;16B"
elif maxval != 255:
decoder_name = "ppm"
args = rawmode if decoder_name == "raw" else (rawmode, maxval)
self.tile = [
ImageFile._Tile(decoder_name, (0, 0) + self.size, self.fp.tell(), args)
]
#
@@ -147,16 +162,19 @@ class PpmImageFile(ImageFile.ImageFile):
class PpmPlainDecoder(ImageFile.PyDecoder):
_pulls_fd = True
_comment_spans: bool
def _read_block(self) -> bytes:
assert self.fd is not None
def _read_block(self):
return self.fd.read(ImageFile.SAFEBLOCK)
def _find_comment_end(self, block, start=0):
def _find_comment_end(self, block: bytes, start: int = 0) -> int:
a = block.find(b"\n", start)
b = block.find(b"\r", start)
return min(a, b) if a * b > 0 else max(a, b) # lowest nonnegative index (or -1)
def _ignore_comments(self, block):
def _ignore_comments(self, block: bytes) -> bytes:
if self._comment_spans:
# Finish current comment
while block:
@@ -190,7 +208,7 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
break
return block
def _decode_bitonal(self):
def _decode_bitonal(self) -> bytearray:
"""
This is a separate method because in the plain PBM format, all data tokens are
exactly one byte, so the inter-token whitespace is optional.
@@ -212,10 +230,10 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
msg = b"Invalid token for this mode: %s" % bytes([token])
raise ValueError(msg)
data = (data + tokens)[:total_bytes]
invert = bytes.maketrans(b"01", b"\xFF\x00")
invert = bytes.maketrans(b"01", b"\xff\x00")
return data.translate(invert)
def _decode_blocks(self, maxval):
def _decode_blocks(self, maxval: int) -> bytearray:
data = bytearray()
max_len = 10
out_byte_count = 4 if self.mode == "I" else 1
@@ -223,7 +241,7 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
bands = Image.getmodebands(self.mode)
total_bytes = self.state.xsize * self.state.ysize * bands * out_byte_count
half_token = False
half_token = b""
while len(data) != total_bytes:
block = self._read_block() # read next block
if not block:
@@ -237,7 +255,7 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
if half_token:
block = half_token + block # stitch half_token to new block
half_token = False
half_token = b""
tokens = block.split()
@@ -254,16 +272,19 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
msg = b"Token too long found in data: %s" % token[: max_len + 1]
raise ValueError(msg)
value = int(token)
if value < 0:
msg_str = f"Channel value is negative: {value}"
raise ValueError(msg_str)
if value > maxval:
msg = f"Channel value too large for this mode: {value}"
raise ValueError(msg)
msg_str = f"Channel value too large for this mode: {value}"
raise ValueError(msg_str)
value = round(value / maxval * out_max)
data += o32(value) if self.mode == "I" else o8(value)
if len(data) == total_bytes: # finished!
break
return data
def decode(self, buffer):
def decode(self, buffer: bytes | Image.SupportsArrayInterface) -> tuple[int, int]:
self._comment_spans = False
if self.mode == "1":
data = self._decode_bitonal()
@@ -279,14 +300,17 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
class PpmDecoder(ImageFile.PyDecoder):
_pulls_fd = True
def decode(self, buffer):
def decode(self, buffer: bytes | Image.SupportsArrayInterface) -> tuple[int, int]:
assert self.fd is not None
data = bytearray()
maxval = self.args[-1]
in_byte_count = 1 if maxval < 256 else 2
out_byte_count = 4 if self.mode == "I" else 1
out_max = 65535 if self.mode == "I" else 255
bands = Image.getmodebands(self.mode)
while len(data) < self.state.xsize * self.state.ysize * bands * out_byte_count:
dest_length = self.state.xsize * self.state.ysize * bands * out_byte_count
while len(data) < dest_length:
pixels = self.fd.read(in_byte_count * bands)
if len(pixels) < in_byte_count * bands:
# eof
@@ -306,15 +330,17 @@ class PpmDecoder(ImageFile.PyDecoder):
# --------------------------------------------------------------------
def _save(im, fp, filename):
def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
if im.mode == "1":
rawmode, head = "1;I", b"P4"
elif im.mode == "L":
rawmode, head = "L", b"P5"
elif im.mode == "I":
elif im.mode in ("I", "I;16"):
rawmode, head = "I;16B", b"P5"
elif im.mode in ("RGB", "RGBA"):
rawmode, head = "RGB", b"P6"
elif im.mode == "F":
rawmode, head = "F;32F", b"Pf"
else:
msg = f"cannot write mode {im.mode} as PPM"
raise OSError(msg)
@@ -326,10 +352,12 @@ def _save(im, fp, filename):
fp.write(b"255\n")
else:
fp.write(b"65535\n")
ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, 0, 1))])
# ALTERNATIVE: save via builtin debug function
# im._dump(filename)
elif head == b"Pf":
fp.write(b"-1.0\n")
row_order = -1 if im.mode == "F" else 1
ImageFile._save(
im, fp, [ImageFile._Tile("raw", (0, 0) + im.size, 0, (rawmode, 0, row_order))]
)
#
@@ -342,6 +370,6 @@ Image.register_save(PpmImageFile.format, _save)
Image.register_decoder("ppm", PpmDecoder)
Image.register_decoder("ppm_plain", PpmPlainDecoder)
Image.register_extensions(PpmImageFile.format, [".pbm", ".pgm", ".ppm", ".pnm"])
Image.register_extensions(PpmImageFile.format, [".pbm", ".pgm", ".ppm", ".pnm", ".pfm"])
Image.register_mime(PpmImageFile.format, "image/x-portable-anymap")