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| -module(binary). | |
| %% API | |
| -export([binary_to_hexstring/1]). | |
| -export([hexstring_to_binary/1]). | |
| %% API | |
| binary_to_hexstring(Bin) when is_binary(Bin) -> | |
| bytelist_to_hexstring(binary_to_list(Bin)). | |
| hexstring_to_binary(String) when is_list(String) -> | |
| list_to_binary(hexstring_to_bytelist(String)). | |
| %% internal | |
| bytelist_to_hexstring([H|T]) when H < 256 -> | |
| [hex_to_hexchar(H div 16), hex_to_hexchar(H rem 16)|bytelist_to_hexstring(T)]; | |
| bytelist_to_hexstring([]) -> | |
| []. | |
| hexstring_to_bytelist([X,Y|T]) -> | |
| [hexchar_to_hex(X)*16 + hexchar_to_hex(Y)|hexstring_to_bytelist(T)]; | |
| hexstring_to_bytelist([]) -> | |
| []. | |
| hex_to_hexchar(N) when N < 10 -> | |
| $0+N; | |
| hex_to_hexchar(N) when N >= 10, N < 16 -> | |
| $a+(N-10). | |
| hexchar_to_hex(C) when $0 =< C, C =< $9 -> | |
| C - $0; | |
| hexchar_to_hex(C) when $A =< C, C =< $F -> | |
| C - $A + 10; | |
| hexchar_to_hex(C) when $a =< C, C =< $f -> | |
| C - $a + 10. |
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