rahix/openflexure-microscope-server
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Blackened everything

Browse source
This commit is contained in:
Joel Collins 2019-09-15 14:17:52 +01:00
parent e213647217
commit 5966ce29be
57 changed files with 1938 additions and 1414 deletions
Download patch file Download diff file Expand all files Collapse all files

25
openflexure_microscope/camera/piexif/_common.py
View file

@ -12,20 +12,21 @@ def split_into_segments(data):
head = 2
segments = [b"\xff\xd8"]
while 1:
if data[head: head + 2] == b"\xff\xda":
if data[head : head + 2] == b"\xff\xda":
segments.append(data[head:])
break
else:
length = struct.unpack(">H", data[head + 2: head + 4])[0]
length = struct.unpack(">H", data[head + 2 : head + 4])[0]
endPoint = head + length + 2
seg = data[head: endPoint]
seg = data[head:endPoint]
segments.append(seg)
head = endPoint
if (head >= len(data)):
if head >= len(data):
raise InvalidImageDataError("Wrong JPEG data.")
return segments
def read_exif_from_file(filename):
"""Slices JPEG meta data into a list from JPEG binary data.
"""
@ -39,11 +40,11 @@ def read_exif_from_file(filename):
HEAD_LENGTH = 4
exif = None
while 1:
length = struct.unpack(">H", head[2: 4])[0]
length = struct.unpack(">H", head[2:4])[0]
if head[:2] == b"\xff\xe1":
segment_data = f.read(length - 2)
if segment_data[:4] != b'Exif':
if segment_data[:4] != b"Exif":
head = f.read(HEAD_LENGTH)
continue
exif = head + segment_data
@ -57,6 +58,7 @@ def read_exif_from_file(filename):
f.close()
return exif
def get_exif_seg(segments):
"""Returns Exif from JPEG meta data list
"""
@ -69,9 +71,11 @@ def get_exif_seg(segments):
def merge_segments(segments, exif=b""):
"""Merges Exif with APP0 and APP1 manipulations.
"""
if segments[1][0:2] == b"\xff\xe0" and \
segments[2][0:2] == b"\xff\xe1" and \
segments[2][4:10] == b"Exif\x00\x00":
if (
segments[1][0:2] == b"\xff\xe0"
and segments[2][0:2] == b"\xff\xe1"
and segments[2][4:10] == b"Exif\x00\x00"
):
if exif:
segments[2] = exif
segments.pop(1)
@ -82,8 +86,7 @@ def merge_segments(segments, exif=b""):
elif segments[1][0:2] == b"\xff\xe0":
if exif:
segments[1] = exif
elif segments[1][0:2] == b"\xff\xe1" and \
segments[1][4:10] == b"Exif\x00\x00":
elif segments[1][0:2] == b"\xff\xe1" and segments[1][4:10] == b"Exif\x00\x00":
if exif:
segments[1] = exif
elif exif is None: