Comments (3)
I'm not sure if you changed the library or not but decode does not take two arguments. Anyway, the backslash should be encoded to 0x9B17
as GSM7 is a septet based (7 bit) encoding. Here is how this happens:
0x1b (H) = 0001 1011 (B), 0x2f (H) = 0010 1111 (B)
A: 0001 1011 --> to 7 bit (drop bit #7) --> 001 1011 --> move bit# 0 of second octet to bit# 7 of the first octet --> 1001 1011
B: 0010 1111 --> shift 1 bit to the right (already move bit# 7) --> 0001 0111
C: Output --> [A, B] = 1001 1011 (B), 0001 0111 (B) -> 0x9B (H), 0x17 (H)
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hi @shokuie ,
Thanks for quick response.
I agree with above encoding logic completely.
I am using GSM7 encoding to send SMS messages using SMPP protocol.
as per docs, GSM-7 is the standard alphabet for SMS messages, written up in the standard GSM 03.38.
The GSM 7-bit default alphabet consists of 128 characters totally and each character is represented by 7 bits. 10 extra characters are defined in the GSM 7-bit default alphabet extension table and they have to be represented through an escape mechanism using the escape character (0x1B). The 10 extra characters are:
Form feed
Caret / circumflex
Left curly bracket
Right curly bracket
Backslash
Left square bracket
Tilde
Right square bracket
Vertical bar
Euro sign
The codes of the 10 characters above begin with 0x1B (i.e. the escape character), which indicates they are escaped sequences. For example, the code of the Backslash sign is 0x1B2F.
Hence I reported the issue.
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Closing this issue as everything looks correct and as expected. Feel free to reopen it if you find some issues.
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