Passing base64 encoded string from C# to javascript

J

Julia

Hi

I am trying to pass an encoded string to a JavaScript

the following is the C# code which convert the string STRING_TO_ENCODE to
base64

byte[] bytIn =
System.Text.UnicodeEncoding.Unicode.GetBytes(STRING_TO_ENCODE);
string result=System.Convert.ToBase64String

the STRING_TO_ENCODE contains both characters in Hebrew and English

I understand that JavaScript uses Unicode strings that is why I am using
UnicodeEncoding.Unicode.GetBytes

tha "result" variable is passed in the URL as a parameter


in the HTML i am using UTF8 char set


It DOES NOT WORK

Thanks
 
I

Igor Tandetnik

Julia said:
I am trying to pass an encoded string to a JavaScript

the following is the C# code which convert the string
STRING_TO_ENCODE to base64

byte[] bytIn =
System.Text.UnicodeEncoding.Unicode.GetBytes(STRING_TO_ENCODE);
string result=System.Convert.ToBase64String

the STRING_TO_ENCODE contains both characters in Hebrew and English

I understand that JavaScript uses Unicode strings that is why I am
using UnicodeEncoding.Unicode.GetBytes

tha "result" variable is passed in the URL as a parameter

It DOES NOT WORK
Click to expand...

What exactly is "It" that "DOES NOT WORK"? What are you trying to do
with the result, and what problem do you have?
--
With best wishes,
Igor Tandetnik

"On two occasions, I have been asked [by members of Parliament], 'Pray,
Mr. Babbage, if you put into the machine wrong figures, will the right
answers come out?' I am not able to rightly apprehend the kind of
confusion of ideas that could provoke such a question." -- Charles
Babbage
 
J

Julia

-I am trying to decode the encoded text to get the orginial text.
-the problem is that instead of hebrew characters i see other charactes(not
just '?')
after decoding.
-decoding is made using JavaScript.
-I don't have any error or exception.
-English characters are correctly displayed.


Thanks.


Igor Tandetnik said:
Julia said:
I am trying to pass an encoded string to a JavaScript

the following is the C# code which convert the string
STRING_TO_ENCODE to base64

byte[] bytIn =
System.Text.UnicodeEncoding.Unicode.GetBytes(STRING_TO_ENCODE);
string result=System.Convert.ToBase64String

the STRING_TO_ENCODE contains both characters in Hebrew and English

I understand that JavaScript uses Unicode strings that is why I am
using UnicodeEncoding.Unicode.GetBytes

tha "result" variable is passed in the URL as a parameter

It DOES NOT WORK
Click to expand...

What exactly is "It" that "DOES NOT WORK"? What are you trying to do
with the result, and what problem do you have?
--
With best wishes,
Igor Tandetnik

"On two occasions, I have been asked [by members of Parliament], 'Pray,
Mr. Babbage, if you put into the machine wrong figures, will the right
answers come out?' I am not able to rightly apprehend the kind of
confusion of ideas that could provoke such a question." -- Charles
Babbage
Click to expand...
 
I

Igor Tandetnik

Julia said:
-I am trying to decode the encoded text to get the orginial text.
-the problem is that instead of hebrew characters i see other
charactes(not just '?')
after decoding.
-decoding is made using JavaScript.
Click to expand...

How is decoding made using JavaScript? Show some code.
--
With best wishes,
Igor Tandetnik

"On two occasions, I have been asked [by members of Parliament], 'Pray,
Mr. Babbage, if you put into the machine wrong figures, will the right
answers come out?' I am not able to rightly apprehend the kind of
confusion of ideas that could provoke such a question." -- Charles
Babbage
 
J

Julia

Thanks

code for decoding

var base64 = [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0 to 7
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8 to 15
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16 to 23
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24 to 31
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32 to 39
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40 to 47
'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48 to 55
'4', '5', '6', '7', '8', '9', '+', '/' ]; // 56 to 63
function reverseBase64 () {
var r = new Object();
for (var i = 0; i < 64; i++) {
r[base64] = i;
} return r;
}
var reversedBase64 = reverseBase64();

function decode (encStr) {
var charCodes = new Array();
var decStr = "";
for (var i = 0; i < encStr.length; i++)
charCodes = reversedBase64[encStr.charAt(i)];
for (var i = 0; i < encStr.length; i += 4) {
var bits24 = ( charCodes & 0xFF ) << 18;
bits24 |= ( charCodes [i + 1] & 0xFF ) << 12;
bits24 |= ( charCodes [i + 2] & 0xFF ) << 6;
bits24 |= ( charCodes [i + 3] & 0xFF ) << 0;
decStr += String.fromCharCode((bits24 & 0xFF0000) >> 16);
if (charCodes[i + 2]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF00) >> 8);
if (charCodes[i + 3]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF) >> 0);
} return decStr;
}



Igor Tandetnik said:
Julia said:
-I am trying to decode the encoded text to get the orginial text.
-the problem is that instead of hebrew characters i see other
charactes(not just '?')
after decoding.
-decoding is made using JavaScript.
Click to expand...

How is decoding made using JavaScript? Show some code.
--
With best wishes,
Igor Tandetnik

"On two occasions, I have been asked [by members of Parliament], 'Pray,
Mr. Babbage, if you put into the machine wrong figures, will the right
answers come out?' I am not able to rightly apprehend the kind of
confusion of ideas that could provoke such a question." -- Charles
Babbage
Click to expand...
 
J

Jon Skeet [C# MVP]

Julia said:
Thanks

code for decoding

var base64 = [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 0 to 7
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 8 to 15
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 16 to 23
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', // 24 to 31
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', // 32 to 39
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', // 40 to 47
'w', 'x', 'y', 'z', '0', '1', '2', '3', // 48 to 55
'4', '5', '6', '7', '8', '9', '+', '/' ]; // 56 to 63
function reverseBase64 () {
var r = new Object();
for (var i = 0; i < 64; i++) {
r[base64] = i;
} return r;
}
var reversedBase64 = reverseBase64();

function decode (encStr) {
var charCodes = new Array();
var decStr = "";
for (var i = 0; i < encStr.length; i++)
charCodes = reversedBase64[encStr.charAt(i)];
for (var i = 0; i < encStr.length; i += 4) {
var bits24 = ( charCodes & 0xFF ) << 18;
bits24 |= ( charCodes [i + 1] & 0xFF ) << 12;
bits24 |= ( charCodes [i + 2] & 0xFF ) << 6;
bits24 |= ( charCodes [i + 3] & 0xFF ) << 0;
decStr += String.fromCharCode((bits24 & 0xFF0000) >> 16);
if (charCodes[i + 2]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF00) >> 8);
if (charCodes[i + 3]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF) >> 0);
} return decStr;
}
Click to expand...


That decoding is the problem. You're decoding it as if each byte is a
character, rather than each *pair* of bytes.
 
I

Igor Tandetnik

Julia said:
for (var i = 0; i < encStr.length; i += 4) {
var bits24 = ( charCodes & 0xFF ) << 18;
bits24 |= ( charCodes [i + 1] & 0xFF ) << 12;
bits24 |= ( charCodes [i + 2] & 0xFF ) << 6;
bits24 |= ( charCodes [i + 3] & 0xFF ) << 0;
decStr += String.fromCharCode((bits24 & 0xFF0000) >> 16);
if (charCodes[i + 2]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF00) >> 8);
if (charCodes[i + 3]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF) >> 0);
} return decStr;
}
Click to expand...


How do you expect to get any Unicode characters, if you never ever pass
a value outside [0-255] range to fromCharCode? You treat each byte as
representing a single character. But when you encoded, every character
was encoded as two bytes.
--
With best wishes,
Igor Tandetnik

"On two occasions, I have been asked [by members of Parliament], 'Pray,
Mr. Babbage, if you put into the machine wrong figures, will the right
answers come out?' I am not able to rightly apprehend the kind of
confusion of ideas that could provoke such a question." -- Charles
Babbage
 
J

Julia

Thanks Jon and Igor
I will try to fix it.
thanks for your help.


Igor Tandetnik said:
Julia said:
for (var i = 0; i < encStr.length; i += 4) {
var bits24 = ( charCodes & 0xFF ) << 18;
bits24 |= ( charCodes [i + 1] & 0xFF ) << 12;
bits24 |= ( charCodes [i + 2] & 0xFF ) << 6;
bits24 |= ( charCodes [i + 3] & 0xFF ) << 0;
decStr += String.fromCharCode((bits24 & 0xFF0000) >> 16);
if (charCodes[i + 2]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF00) >> 8);
if (charCodes[i + 3]) // check for padding character =
decStr += String.fromCharCode((bits24 & 0xFF) >> 0);
} return decStr;
}
Click to expand...


How do you expect to get any Unicode characters, if you never ever pass
a value outside [0-255] range to fromCharCode? You treat each byte as
representing a single character. But when you encoded, every character
was encoded as two bytes.
--
With best wishes,
Igor Tandetnik

"On two occasions, I have been asked [by members of Parliament], 'Pray,
Mr. Babbage, if you put into the machine wrong figures, will the right
answers come out?' I am not able to rightly apprehend the kind of
confusion of ideas that could provoke such a question." -- Charles
Babbage
Click to expand...
 

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