BlockchainProgram/contracts/imports/strings.fc at master · HyperlinksSpace/BlockchainProgram · GitHub

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{-
    strings.func

    Provides operations on strings.
-}

(slice) strings::base64url (slice bytes) {
    int size = bytes.slice_bits() / 6;
    builder result = begin_cell();

    repeat (size) {
        int code = bytes~load_uint(6);
        if (code < 26) {
            result~store_uint(65 + code, 8);
        }
        if ((code >= 26) & (code < 52)) {
            result~store_uint(97 + code - 26, 8);
        }
        if ((code >= 52) & (code < 62)) {
            result~store_uint(48 + code - 52, 8);
        }
        if (code == 62) {
            result~store_uint(45, 8);
        }
        if (code == 63) {
            result~store_uint(95, 8);
        }
    }

    size = bytes.slice_bits();
    if (size > 0) {
        int code = (bytes~load_uint(size)) << (6 - size);
        if (code < 26) {
            result~store_uint(65 + code, 8);
        }
        if ((code >= 26) & (code < 52)) {
            result~store_uint(97 + code - 26, 8);
        }
        if ((code >= 52) & (code < 62)) {
            result~store_uint(48 + code - 52, 8);
        }
        if (code == 62) {
            result~store_uint(45, 8);
        }
        if (code == 63) {
            result~store_uint(95, 8);
        }
    }

    return result.end_cell().begin_parse();
}