//
// Enline_Bytes: C
//
void Enline_Bytes(REBSER *ser, REBCNT idx, REBCNT len)
{
REBCNT cnt = 0;
REBYTE *bp;
REBYTE c = 0;
REBCNT tail;
// Calculate the size difference by counting the number of LF's
// that have no CR's in front of them.
bp = BIN_AT(ser, idx);
for (; len > 0; len--) {
if (*bp == LF && c != CR) cnt++;
c = *bp++;
}
if (cnt == 0) return;
// Extend series:
len = SER_LEN(ser); // before expansion
EXPAND_SERIES_TAIL(ser, cnt);
tail = SER_LEN(ser); // after expansion
bp = BIN_HEAD(ser); // expand may change it
// Add missing CRs:
while (cnt > 0) {
bp[tail--] = bp[len]; // Copy src to dst.
if (bp[len] == LF && (len == 0 || bp[len - 1] != CR)) {
bp[tail--] = CR;
cnt--;
}
len--;
}
}
//
// Cloak: C
//
// Simple data scrambler. Quality depends on the key length.
// Result is made in place (data string).
//
// The key (kp) is passed as a REBVAL or REBYTE (when klen is !0).
//
REBOOL Cloak(REBOOL decode, REBYTE *cp, REBCNT dlen, REBYTE *kp, REBCNT klen, REBOOL as_is)
{
REBCNT i, n;
REBYTE src[20];
REBYTE dst[20];
if (dlen == 0) return TRUE;
// Decode KEY as VALUE field (binary, string, or integer)
if (klen == 0) {
REBVAL *val = (REBVAL*)kp;
REBSER *ser;
switch (VAL_TYPE(val)) {
case REB_BINARY:
kp = VAL_BIN_AT(val);
klen = VAL_LEN_AT(val);
break;
case REB_STRING:
ser = Temp_Bin_Str_Managed(val, &i, &klen);
kp = BIN_AT(ser, i);
break;
case REB_INTEGER:
INT_TO_STR(VAL_INT64(val), dst);
klen = LEN_BYTES(dst);
as_is = FALSE;
break;
}
if (klen == 0) return FALSE;
}
if (!as_is) {
for (i = 0; i < 20; i++) src[i] = kp[i % klen];
SHA1(src, 20, dst);
klen = 20;
kp = dst;
}
if (decode)
for (i = dlen-1; i > 0; i--) cp[i] ^= cp[i-1] ^ kp[i % klen];
// Change starting byte based all other bytes.
n = 0xa5;
for (i = 1; i < dlen; i++) n += cp[i];
cp[0] ^= (REBYTE)n;
if (!decode)
for (i = 1; i < dlen; i++) cp[i] ^= cp[i-1] ^ kp[i % klen];
return TRUE;
}
//
// Trim_Tail: C
//
// Used to trim off hanging spaces during FORM and MOLD.
//
void Trim_Tail(REBSER *src, REBYTE chr)
{
REBOOL unicode = NOT(BYTE_SIZE(src));
REBCNT tail;
REBUNI c;
assert(!Is_Array_Series(src));
for (tail = SER_LEN(src); tail > 0; tail--) {
c = unicode ? *UNI_AT(src, tail - 1) : *BIN_AT(src, tail - 1);
if (c != chr) break;
}
SET_SERIES_LEN(src, tail);
TERM_SEQUENCE(src);
}
//
// Trim_Tail: C
//
// Used to trim off hanging spaces during FORM and MOLD.
//
void Trim_Tail(REB_MOLD *mo, REBYTE ascii)
{
assert(ascii < 0x80); // more work needed for multi-byte characters
REBCNT len = STR_LEN(mo->series);
REBSIZ size = STR_SIZE(mo->series);
for (; size > 0; --size, --len) {
REBYTE b = *BIN_AT(SER(mo->series), size - 1);
if (b != ascii)
break;
}
TERM_STR_LEN_SIZE(mo->series, len, size);
}
//
// RL_Get_String: C
//
// Obtain a pointer into a string (bytes or unicode).
//
// Returns:
// The length and type of string. When len > 0, string is unicode.
// When len < 0, string is bytes.
// Arguments:
// series - string series pointer
// index - index from beginning (zero-based)
// str - pointer to first character
// Notes:
// If the len is less than zero, then the string is optimized to
// codepoints (chars) 255 or less for ASCII and LATIN-1 charsets.
// Strings are allowed to move in memory. Therefore, you will want
// to make a copy of the string if needed.
//
RL_API int RL_Get_String(REBSER *series, u32 index, void **str)
{ // ret: len or -len
int len;
if (index >= SER_LEN(series))
len = 0;
else
len = SER_LEN(series) - index;
if (BYTE_SIZE(series)) {
*str = BIN_AT(series, index);
len = -len;
}
else {
*str = UNI_AT(series, index);
}
return len;
}
