File: thumbspage/piexif/_insert.py

import io
import struct
import sys
from ._common import *
from ._exceptions import InvalidImageDataError
from piexif import _webp
def insert(exif, image, new_file=None):
 """
 py:function:: piexif.insert(exif_bytes, filename)
 Insert exif into JPEG.
 :param bytes exif_bytes: Exif as bytes
 :param str filename: JPEG
 """
 if exif[0:6] != b"\x45\x78\x69\x66\x00\x00":
 raise ValueError("Given data is not exif data")
 output_file = False
 # Prevents "UnicodeWarning: Unicode equal comparison failed" warnings on Python 2
 maybe_image = sys.version_info >= (3,0,0) or isinstance(image, str)
 if maybe_image and image[0:2] == b"\xff\xd8":
 image_data = image
 file_type = "jpeg"
 elif maybe_image and image[0:4] == b"RIFF" and image[8:12] == b"WEBP":
 image_data = image
 file_type = "webp"
 else:
 with open(image, 'rb') as f:
 image_data = f.read()
 if image_data[0:2] == b"\xff\xd8":
 file_type = "jpeg"
 elif image_data[0:4] == b"RIFF" and image_data[8:12] == b"WEBP":
 file_type = "webp"
 else:
 raise InvalidImageDataError
 output_file = True
 if file_type == "jpeg":
 exif = b"\xff\xe1" + struct.pack(">H", len(exif) + 2) + exif
 segments = split_into_segments(image_data)
 new_data = merge_segments(segments, exif)
 elif file_type == "webp":
 exif = exif[6:]
 new_data = _webp.insert(image_data, exif)
 if isinstance(new_file, io.BytesIO):
 new_file.write(new_data)
 new_file.seek(0)
 elif new_file:
 with open(new_file, "wb+") as f:
 f.write(new_data)
 elif output_file:
 with open(image, "wb+") as f:
 f.write(new_data)
 else:
 raise ValueError("Give a 3rd argument to 'insert' to output file")