/
test_file_ppm.py
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/
test_file_ppm.py
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import sys
from io import BytesIO
import pytest
from PIL import Image, PpmImagePlugin
from .helper import assert_image_equal_tofile, assert_image_similar, hopper
# sample ppm stream
TEST_FILE = "Tests/images/hopper.ppm"
def test_sanity():
with Image.open(TEST_FILE) as im:
im.load()
assert im.mode == "RGB"
assert im.size == (128, 128)
assert im.format, "PPM"
assert im.get_format_mimetype() == "image/x-portable-pixmap"
def test_16bit_pgm():
with Image.open("Tests/images/16_bit_binary.pgm") as im:
im.load()
assert im.mode == "I"
assert im.size == (20, 100)
assert im.get_format_mimetype() == "image/x-portable-graymap"
assert_image_equal_tofile(im, "Tests/images/16_bit_binary_pgm.png")
def test_16bit_pgm_write(tmp_path):
with Image.open("Tests/images/16_bit_binary.pgm") as im:
im.load()
f = str(tmp_path / "temp.pgm")
im.save(f, "PPM")
assert_image_equal_tofile(im, f)
def test_pnm(tmp_path):
with Image.open("Tests/images/hopper.pnm") as im:
assert_image_similar(im, hopper(), 0.0001)
f = str(tmp_path / "temp.pnm")
im.save(f)
assert_image_equal_tofile(im, f)
def test_plain_pbm(tmp_path):
with Image.open("Tests/images/hopper_1bit_plain.pbm") as im:
assert_image_equal_tofile(im, "Tests/images/hopper_1bit.pbm")
def test_8bit_plain_pgm(tmp_path):
with Image.open("Tests/images/hopper_8bit_plain.pgm") as im:
assert_image_equal_tofile(im, "Tests/images/hopper_8bit.pgm")
def test_8bit_plain_ppm(tmp_path):
with Image.open("Tests/images/hopper_8bit_plain.ppm") as im:
assert_image_equal_tofile(im, "Tests/images/hopper_8bit.ppm")
def test_16bit_plain_pgm(tmp_path):
with Image.open("Tests/images/hopper_16bit_plain.pgm") as im:
assert im.mode == "I"
assert im.size == (128, 128)
assert im.get_format_mimetype() == "image/x-portable-graymap"
assert_image_equal_tofile(im, "Tests/images/hopper_16bit.pgm")
def test_32bit_plain_pgm(tmp_path):
with Image.open("Tests/images/hopper_32bit_plain.pgm") as im:
assert im.mode == "I"
assert im.size == (128, 128)
assert im.get_format_mimetype() == "image/x-portable-graymap"
assert_image_equal_tofile(im, "Tests/images/hopper_32bit.pgm")
def test_plain_pbm_data_with_comments(tmp_path):
path1 = str(tmp_path / "temp1.ppm")
path2 = str(tmp_path / "temp2.ppm")
comment = b"# veeery long comment" * 10 ** 6
with open(path1, "wb") as f1, open(path2, "wb") as f2:
f1.write(b"P1\n2 2\n\n1010")
f2.write(b"P1\n2 2\n" + comment + b"\n1010" + comment)
with Image.open(path1) as im:
assert_image_equal_tofile(im, path2)
def test_plain_pbm_truncated_data(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P1\n128 128\n")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_plain_pbm_invalid_data(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P1\n128 128\n1009")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_plain_ppm_data_with_comments(tmp_path):
path1 = str(tmp_path / "temp1.ppm")
path2 = str(tmp_path / "temp2.ppm")
comment = b"# veeery long comment" * 10 ** 6
with open(path1, "wb") as f1, open(path2, "wb") as f2:
f1.write(b"P3\n2 2\n255\n0 0 0 001 1 1 2 2 2 255 255 255")
f2.write(
b"P3\n2 2\n255\n" + comment + b"\n0 0 0 001 1 1 2 2 2 255 255 255" + comment
)
with Image.open(path1) as im:
assert_image_equal_tofile(im, path2)
def test_plain_ppm_truncated_data(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P3\n128 128\n255\n")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_plain_ppm_invalid_data(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P3\n128 128\n255\n100A")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_plain_ppm_half_token_too_long(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P3\n128 128\n255\n012345678910")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_plain_ppm_token_too_long(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P3\n128 128\n255\n012345678910 0")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_plain_ppm_value_too_large(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P3\n128 128\n255\n256")
with Image.open(path) as im:
with pytest.raises(ValueError):
im.load()
def test_magic(tmp_path):
with pytest.raises(SyntaxError):
PpmImagePlugin.PpmImageFile(fp=BytesIO(b"PyInvalid"))
def test_header_with_comments(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6 #comment\n#comment\r 12#comment\r8\n128 #comment\n255\n")
with Image.open(path) as im:
assert im.size == (128, 128)
def test_non_integer_token(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6\nTEST")
with pytest.raises(ValueError):
with Image.open(path):
pass
def test_header_token_too_long(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6\n 01234567890")
with pytest.raises(ValueError) as e:
with Image.open(path):
pass
assert str(e.value) == "Token too long in file header: b'01234567890'"
def test_too_many_colors(tmp_path):
path = str(tmp_path / "temp.ppm")
with open(path, "wb") as f:
f.write(b"P6\n1 1\n1000\n")
with pytest.raises(ValueError) as e:
with Image.open(path):
pass
assert str(e.value) == "Too many colors for band: 1000"
def test_truncated_header(tmp_path):
path = str(tmp_path / "temp.pgm")
with open(path, "w") as f:
f.write("P6")
with pytest.raises(ValueError) as e:
with Image.open(path):
pass
assert str(e.value) == "Reached EOF while reading header"
def test_neg_ppm():
# Storage.c accepted negative values for xsize, ysize. the
# internal open_ppm function didn't check for sanity but it
# has been removed. The default opener doesn't accept negative
# sizes.
with pytest.raises(OSError):
with Image.open("Tests/images/negative_size.ppm"):
pass
def test_mimetypes(tmp_path):
path = str(tmp_path / "temp.pgm")
with open(path, "w") as f:
f.write("P4\n128 128\n255")
with Image.open(path) as im:
assert im.get_format_mimetype() == "image/x-portable-bitmap"
with open(path, "w") as f:
f.write("PyCMYK\n128 128\n255")
with Image.open(path) as im:
assert im.get_format_mimetype() == "image/x-portable-anymap"
@pytest.mark.parametrize("buffer", (True, False))
def test_save_stdout(buffer):
old_stdout = sys.stdout
if buffer:
class MyStdOut:
buffer = BytesIO()
mystdout = MyStdOut()
else:
mystdout = BytesIO()
sys.stdout = mystdout
with Image.open(TEST_FILE) as im:
im.save(sys.stdout, "PPM")
# Reset stdout
sys.stdout = old_stdout
if buffer:
mystdout = mystdout.buffer
with Image.open(mystdout) as reloaded:
assert_image_equal_tofile(reloaded, TEST_FILE)