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author | aliaspider | 2019-05-14 08:58:52 +0100 |
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committer | aliaspider | 2019-05-14 08:58:52 +0100 |
commit | ce188d4d7f3b9ad04867c49b424e8497c2ade92b (patch) | |
tree | b7f82140860acabb2d0e3a5216f78bf98691c267 /deps/crypto/rot-13.c | |
parent | 5ffd1f23eb970679dfe8b540bc3df8e776dc9e17 (diff) | |
download | pcsx_rearmed-ce188d4d7f3b9ad04867c49b424e8497c2ade92b.tar.gz pcsx_rearmed-ce188d4d7f3b9ad04867c49b424e8497c2ade92b.tar.bz2 pcsx_rearmed-ce188d4d7f3b9ad04867c49b424e8497c2ade92b.zip |
add CHD support.
Diffstat (limited to 'deps/crypto/rot-13.c')
-rw-r--r-- | deps/crypto/rot-13.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/deps/crypto/rot-13.c b/deps/crypto/rot-13.c new file mode 100644 index 0000000..0ab8497 --- /dev/null +++ b/deps/crypto/rot-13.c @@ -0,0 +1,35 @@ +/********************************************************************* +* Filename: rot-13.c +* Author: Brad Conte (brad AT bradconte.com) +* Copyright: +* Disclaimer: This code is presented "as is" without any guarantees. +* Details: Implementation of the ROT-13 encryption algorithm. + Algorithm specification can be found here: + * + This implementation uses little endian byte order. +*********************************************************************/ + +/*************************** HEADER FILES ***************************/ +#include <string.h> +#include "rot-13.h" + +/*********************** FUNCTION DEFINITIONS ***********************/ +void rot13(char str[]) +{ + int case_type, idx, len; + + for (idx = 0, len = strlen(str); idx < len; idx++) { + // Only process alphabetic characters. + if (str[idx] < 'A' || (str[idx] > 'Z' && str[idx] < 'a') || str[idx] > 'z') + continue; + // Determine if the char is upper or lower case. + if (str[idx] >= 'a') + case_type = 'a'; + else + case_type = 'A'; + // Rotate the char's value, ensuring it doesn't accidentally "fall off" the end. + str[idx] = (str[idx] + 13) % (case_type + 26); + if (str[idx] < 26) + str[idx] += case_type; + } +} |