Try this: function _base64ToArrayBuffer(base64) { var binary_string = window.atob(base64); var len = binary_string.length; var bytes = new Uint8Array(len); for (var i = 0; i < len; i++) { bytes[i] = binary_string.charCodeAt(i); } return bytes.buffer; }
input file element: <input type=”file” id=”fileinput” /> get file : var myFile = $(‘#fileinput’).prop(‘files’);
You can use following approach: import org.apache.commons.codec.binary.Base64; // Encode data on your side using BASE64 byte[] bytesEncoded = Base64.encodeBase64(str.getBytes()); System.out.println(“encoded value is ” + new String(bytesEncoded)); // Decode data on other side, by processing encoded data byte[] valueDecoded = Base64.decodeBase64(bytesEncoded); System.out.println(“Decoded value is ” + new String(valueDecoded)); Hope this answers your doubt.
Edit: Since I wrote this answer Base64.strict_encode64() was added, which does not add newlines. The docs are somewhat confusing, the b64encode method is supposed to add a newline for every 60th character, and the example for the encode64 method is actually using the b64encode method. It seems the pack(“m”) method for the Array class used … Read more
Base64 encodes each set of three bytes into four bytes. In addition the output is padded to always be a multiple of four. This means that the size of the base-64 representation of a string of size n is: ceil(n / 3) * 4 So, for a 16kB array, the base-64 representation will be ceil(16*1024/3)*4 … Read more
Each character is used to represent 6 bits (log2(64) = 6). Therefore 4 chars are used to represent 4 * 6 = 24 bits = 3 bytes. So you need 4*(n/3) chars to represent n bytes, and this needs to be rounded up to a multiple of 4. The number of unused padding chars resulting … Read more
I think you are converting the data a bit more than you need to. Once you create the buffer with the proper encoding, you just need to write the buffer to the file. var base64Data = req.rawBody.replace(/^data:image\/png;base64,/, “”); require(“fs”).writeFile(“out.png”, base64Data, ‘base64′, function(err) { console.log(err); }); new Buffer(…, ‘base64’) will convert the input string to a … Read more
I’m not sure I understand your question. I assume you are doing something along the lines of: import base64 with open(“yourfile.ext”, “rb”) as image_file: encoded_string = base64.b64encode(image_file.read()) You have to open the file first of course, and read its contents – you cannot simply pass the path to the encode function. Edit: Ok, here is … Read more
You can just basically revert your code using some other built in methods. byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT); Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
This is a good use case for Objective C categories. For Base64 encoding: #import <Foundation/NSString.h> @interface NSString (NSStringAdditions) + (NSString *) base64StringFromData:(NSData *)data length:(int)length; @end ——————————————- #import “NSStringAdditions.h” static char base64EncodingTable[64] = { ‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’, ‘G’, ‘H’, ‘I’, ‘J’, ‘K’, ‘L’, ‘M’, ‘N’, ‘O’, ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’, ‘U’, ‘V’, … Read more