How do I compress base64 data using stringIO into a buffer? - python

Working on this challenge for my Python course and cant seem to figure out how to continue. I think what i have so far is correct but any input would be amazing.
Goal: Decode the base64 blob included below
import base64
import gzip
import StringIO
# This is our base64 encoded string
data = 'H4sIAAAAAAAAAL1X6W+j....'
def main():
# Decode the base64 string into a variable
decoded = base64.b64decode(data)
# Create a variable that holds a stream living in a buffer
# Decompress our stream
# Print it to the screen
if __name__ == '__main__':
main()

Here is a solution with detailed explanation
#Going by the comments in your code
#content of data variable is first gzip compressed and then base64 encoded
#In order to get the original content back, you must,
#first base64 decode and then gzip uncompress it
#since gzip works on file objects, StringIO is to be used
#StringIO module implements a file-like class, that reads and writes a string buffer
import StringIO
import base64
import gzip
data = "...." #gzip compressed => base64 encoded
b64decoded = base64.b64decode(data) # base64 decode
inputstream = StringIO.StringIO();
inputstream.write(b64decoded)
inputstream.seek(0)
#
uncompressGzip = gzip.GzipFile(fileobj=inputstream, mode='rb') # gzip uncompress
originalData = uncompressGzip.read()
print(originalData)
Here is a simple test, compress => encode => decode => uncompress
import StringIO
import base64
import gzip
buf = StringIO.StringIO()
compressGzip = gzip.GzipFile(fileobj=buf, mode="wb")
compressGzip.write("Hello, how are you?")
compressGzip.close()
buf.seek(0)
data = base64.b64encode(buf.getvalue())
# your solution from this point onwards
b64decoded = base64.b64decode(data) # base64 decode
inputstream = StringIO.StringIO();
inputstream.write(b64decoded)
inputstream.seek(0)
#
uncompressGzip = gzip.GzipFile(fileobj=inputstream, mode='rb') # gzip uncompress
originalData = uncompressGzip.read()
print(originalData)

Related

XML to base64 using python

How to convert complete xml file to base64 string using python/ scala?
I have tried b64 module ,but it requires a string(bytes-like) to be passed to it . But how to do that with ML given it's multiline structure and hierarchy.
Could anyone give an example on how to do it.
Thanks.
Python solution:
import base64
# convert file content to base64 encoded string
with open("input.xml", "rb") as file:
encoded = base64.encodebytes(file.read()).decode("utf-8")
# output base64 content
print(encoded)
decoded = base64.decodebytes(encoded.encode('utf-8'))
# write decoded base64 content to file
with open("output.xml", "wb") as file:
file.write(decoded)
# output decoded base64 content
print(decoded.decode('utf-8'))

Cant finde a way to download picture using selenium and python [duplicate]

I have a string in base64 format, which represents PNG image. Is there a way to save this image to the filesystem, as a PNG file?
I encoded the image using flex. Actually this is what I get on server
(can't see any image after any of proposed methods :( )
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Starting with
img_data = 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Decoded the data using the base64 codec, and then write it to the filesystem.
# In Python 2.7
fh = open("imageToSave.png", "wb")
fh.write(img_data.decode('base64'))
fh.close()
# or, more concisely using with statement
with open("imageToSave.png", "wb") as fh:
fh.write(img_data.decode('base64'))
Modernizing this example to Python 3, which removed arbitrary codec support from string/bytes .encode() and .decode() functions:
# For both Python 2.7 and Python 3.x
import base64
with open("imageToSave.png", "wb") as fh:
fh.write(base64.decodebytes(img_data))
If the imagestr was bitmap data (which we now know it isn't) you could use this
imagestr is the base64 encoded string
width is the width of the image
height is the height of the image
from PIL import Image
from base64 import decodestring
image = Image.fromstring('RGB',(width,height),decodestring(imagestr))
image.save("foo.png")
Since the imagestr is just the encoded png data
from base64 import decodestring
with open("foo.png","wb") as f:
f.write(decodestring(imagestr))
As simple as that!
import io, base64
from PIL import Image
# Assuming base64_str is the string value without 'data:image/jpeg;base64,'
img = Image.open(io.BytesIO(base64.decodebytes(bytes(base64_str, "utf-8"))))
img.save('my-image.jpeg')
If you are trying to decode a web image you can simply use this :
import base64
with open("imageToSave.png", "wb") as fh:
fh.write(base64.urlsafe_b64decode('data'))
data => is the encoded string
It will take care of the padding errors
import base64
from PIL import Image
import io
image = base64.b64decode(str('stringdata'))
fileName = 'test.jpeg'
imagePath = ('D:\\base64toImageNewPath\\'+fileName)
img = Image.open(io.BytesIO(image))
img.save(imagePath, 'jpeg')
You can also save it to a string buffer and then do as you wish with it,
import cStringIO
data = json.loads(request.POST['imgData']) # Getting the object from the post request
image_output = cStringIO.StringIO()
image_output.write(data.decode('base64')) # Write decoded image to buffer
image_output.seek(0) # seek beginning of the image string
# image_output.read() # Do as you wish with it!
In django, you can save it as an uploaded file to save to a model:
from django.core.files.uploadedfile import SimpleUploadedFile
suf = SimpleUploadedFile('uploaded_file.png', image_output.read(), content_type='image/png')
Or send it as an email:
email = EmailMessage('Hello', 'Body goes here', 'from#example.com',
['me#me.com', ])
email.attach('design.png', image_output.read(), 'image/png')
email.send()
You can use Pillow.
pip install Pillow
image = base64.b64decode(str(base64String))
fileName = 'test.jpeg'
imagePath = FILE_UPLOAD_DIR + fileName
img = Image.open(io.BytesIO(image))
img.save(imagePath, 'jpeg')
return fileName
reference for complete source code: https://abhisheksharma.online/convert-base64-blob-to-image-file-in-python/
Try this solution,
image file --> binary encoded string
binary encoded string --> image file
import base64
"""
1st step - convert image into binary
"""
with open("original_image.png", "rb") as original_file:
encoded_string = base64.b64encode(original_file.read())
print(encoded_string)
# xmzWowsfJbpGwCe0DTveqwvos7Mf0lcVNe/Q+G1hO/p+UNPd/stUse8AhP/3fDixf8HI3No67nvhlYAAAAASUVORK5CYII='
print(type(encoded_string))
# <class 'bytes'>
"""
2nd step - create new image using the encoded string
"""
with open("new_image.png", "wb") as new_file:
new_file.write(base64.decodebytes(encoded_string))
References:
Encoding an image file with base64
How to make a binary image with python?
You could probably use the PyPNG package's png.Reader object to do this - decode the base64 string into a regular string (via the base64 standard library), and pass it to the constructor.

How to base64 encode an image using python

I have a stream of data that comes from a device and I need to convert it into a jpeg and then base64 encode it to transfer it over the network.
My Python 2.7 code so far looks like this:
from PIL import Image
import io
image = Image.open(io.BytesIO(self.imagebuffer)) # Image buffer contains the image data from the device.
image.save("test.jpg") # Writes the image to the disk in jpeg format
image.show() # Opens the image using the OS image view
I can see I have the image I want and can save it to the disk in jpeg format.
What I don't understand is if I can base64 encode the image from the image object or if I need to write it to the disk first. I would like to avoid writing it if possible.
The 2nd question I have is what is PIL doing in this process? Is it taking the data and putting the required special codes into the file to make it a jpeg file? I think the answer tot his is yes as I can change the file extension to .bmp and the correct file is written on the disk.
So in summary, is it possible to get a base64 encoded version of my jpeg file from the image object without writing it to disk first?
Try this code
Image base64 encoded format
Python code:
import os
import base64
image = 'test.jpg'
encoded_string = ""
with open(image, "rb") as image_file:
encoded_string = base64.b64encode(image_file.read())
file = encoded_string
This code does the job:
from PIL import Image
import io
import base64
import cStringIO
image = Image.open(io.BytesIO(imagebuffer))
encodingbuffer = cStringIO.StringIO()
image.save(encodingbuffer, format="JPEG")
encodedimage = base64.b64encode(encodingbuffer.getvalue())
Save the img in a buffer - doesn't touch disk
regex for jpeg headers and footers - fault tolerance ( Header: FF D8 FF, Footer: FF D9)
base64 the data
flush to file
I`m working with .dwg file and Python 2.7, this works for me:
import os
import base64
# Open the file
infile = open(input_file, 'r')
# 'r' says we are opening the file to read, infile is the opened file object that we will read from
# encode file to base64
base64EncodedStr = base64.b64encode(infile.read())
Please try this to base64 encode an image using python
import base64
with open("test.jpg", "rb") as image_file:
encoded_string = base64.b64encode(image_file.read())
print(encoded_string)
OR
import base64
image = open('test.jpeg', 'rb')
image_read = image.read()
image_encode = base64.b64encode(image_read)
print(image_encode)

Save Base64 String into Django ImageField

Im doing an application that uses Django in server-side.
Im trying to do that:
import uuid
from base64 import b64decode
from django.core.files.base import ContentFile
#staticmethod
def add_photo(user, person, image_base64):
photo = DatabasePersonPhoto()
photo.user = user
photo.person = person
image_data = b64decode(image_base64)
image_name = str(uuid.uuid4())+".jpg"
photo.image = ContentFile(image_data, image_name)
photo.save()
return photo
This is my Base64 String:
data:image/jpeg;base64,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
The image file is generated, but I cant open it like an image.
I think this will be a best approach tried it and tested in django 1.10. based on this SO answer: https://stackoverflow.com/a/28036805/6143656
I made a function for decoded base64 file.
def decode_base64_file(data):
def get_file_extension(file_name, decoded_file):
import imghdr
extension = imghdr.what(file_name, decoded_file)
extension = "jpg" if extension == "jpeg" else extension
return extension
from django.core.files.base import ContentFile
import base64
import six
import uuid
# Check if this is a base64 string
if isinstance(data, six.string_types):
# Check if the base64 string is in the "data:" format
if 'data:' in data and ';base64,' in data:
# Break out the header from the base64 content
header, data = data.split(';base64,')
# Try to decode the file. Return validation error if it fails.
try:
decoded_file = base64.b64decode(data)
except TypeError:
TypeError('invalid_image')
# Generate file name:
file_name = str(uuid.uuid4())[:12] # 12 characters are more than enough.
# Get the file name extension:
file_extension = get_file_extension(file_name, decoded_file)
complete_file_name = "%s.%s" % (file_name, file_extension, )
return ContentFile(decoded_file, name=complete_file_name)
Then you can call the function
import decode_base64_file
p = Post(content='My Picture', image=decode_based64_file(your_base64_file))
p.save()
I found the solution.
I need to use only the parte without data:image/jpeg;base64,
In Python, we can do it with something like this:
image_base64 = image_base64.split('base64,', 1 )
fh = open("imageToSave.png", "wb")
fh.write(imgData.decode('base64'))
fh.close()
Edit (klaus-d): The code above gives an example, how to store an image file from BASE64 encoded data. It opens a file imageToSave.png in binary mode for writing, then decodes the base64 image data and write the result to the file. At the end it closes the file descriptor.

Using python how do I convert an RGB array to an encoded image suitable for transmission via HTTP?

I know I can save an RGB array to a file using
from matplotlib.pyplot import imsave
rgb = numpy.zeros([height,width,3], dtype=numpy.uint8)
paint_picture(rgb)
imsave("/tmp/whatever.png", rgb)
but now I want to write the PNG to a byte buffer instead of a file so I can later transmit those PNG bytes via HTTP. There must be no temporary files involved.
Bonus points if the answer has variations that support formats other than PNG.
Evidently imsave supports "file-like objects" of which io.BytesIO is the one I need:
buffer = BytesIO()
imsave(buffer, rgb)
encoded_png = buffer.getbuffer()
#and then my class derived from BaseHTTPRequestHandler can transmit it as the response to a GET
self.send_response(200)
self.send_header("Content-Type", "image/png")
self.end_headers()
self.wfile.write(encoded_png)
return
If you want to do a file upload (any type of picture)
Send file using POST from a Python script
But if you want to send raw png data you can reread the file and encode it in base64. Your server just have to decode base64 and write the file.
import base64
from urllib.parse import urlencode
from urllib.request import Request, urlopen
array_encoded = ""
with open("/tmp/whatever.png") as f:
array_encoded = base64.encode(f)
url = 'https://URL.COM' # Set destination URL here
post_fields = {'image': array_encoded} # Set POST fields here
request = Request(url, urlencode(post_fields).encode())
responce = urlopen(request).read()
print(responce)
Code not tested!!!!!!!

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