static void
skipSpace(char **pbp, char *endptr)
{
char *bp = *pbp;
while (bp < endptr && OPTIONAL_SPACE(*bp)) {
bp++;
}
*pbp = bp;
}
/* Some characters must be escaped as a hex string, e.g. c -> \nn .
* Others must be escaped by preceding with a '\', e.g. c -> \c , but
* there are certain "special characters" that may be handled by either
* escaping them, or by enclosing the entire attribute value in quotes.
* A NULL value for pEQMode implies selecting minimalEscape mode.
* Some callers will do quoting when needed, others will not.
* If a caller selects minimalEscapeAndQuote, and the string does not
* need quoting, then this function changes it to minimalEscape.
*/
static int
cert_RFC1485_GetRequiredLen(const char *src, int srclen, EQMode *pEQMode)
{
int i, reqLen=0;
EQMode mode = pEQMode ? *pEQMode : minimalEscape;
PRBool needsQuoting = PR_FALSE;
char lastC = 0;
/* need to make an initial pass to determine if quoting is needed */
for (i = 0; i < srclen; i++) {
char c = src[i];
reqLen++;
if (NEEDS_HEX_ESCAPE(c)) { /* c -> \xx */
reqLen += 2;
} else if (NEEDS_ESCAPE(c)) { /* c -> \c */
reqLen++;
} else if (SPECIAL_CHAR(c)) {
if (mode == minimalEscapeAndQuote) /* quoting is allowed */
needsQuoting = PR_TRUE; /* entirety will need quoting */
else if (mode == fullEscape)
reqLen++; /* MAY escape this character */
} else if (OPTIONAL_SPACE(c) && OPTIONAL_SPACE(lastC)) {
if (mode == minimalEscapeAndQuote) /* quoting is allowed */
needsQuoting = PR_TRUE; /* entirety will need quoting */
}
lastC = c;
}
/* if it begins or ends in optional space it needs quoting */
if (!needsQuoting && srclen > 0 && mode == minimalEscapeAndQuote &&
(OPTIONAL_SPACE(src[srclen-1]) || OPTIONAL_SPACE(src[0]))) {
needsQuoting = PR_TRUE;
}
if (needsQuoting)
reqLen += 2;
if (pEQMode && mode == minimalEscapeAndQuote && !needsQuoting)
*pEQMode = minimalEscape;
return reqLen;
}
static SECStatus
scanTag(const char **pbp, const char *endptr, char *tagBuf, int tagBufSize)
{
const char *bp;
char *tagBufp;
int taglen;
PORT_Assert(tagBufSize > 0);
/* skip optional leading space */
skipSpace(pbp, endptr);
if (*pbp == endptr) {
/* nothing left */
return SECFailure;
}
/* fill tagBuf */
taglen = 0;
bp = *pbp;
tagBufp = tagBuf;
while (bp < endptr && !OPTIONAL_SPACE(*bp) && (*bp != C_EQUAL)) {
if (++taglen >= tagBufSize) {
*pbp = bp;
return SECFailure;
}
*tagBufp++ = *bp++;
}
/* null-terminate tagBuf -- guaranteed at least one space left */
*tagBufp++ = 0;
*pbp = bp;
/* skip trailing spaces till we hit something - should be an equal sign */
skipSpace(pbp, endptr);
if (*pbp == endptr) {
/* nothing left */
return SECFailure;
}
if (**pbp != C_EQUAL) {
/* should be an equal sign */
return SECFailure;
}
/* skip over the equal sign */
(*pbp)++;
return SECSuccess;
}
/* Returns the number of bytes in the value. 0 means failure. */
static int
scanVal(char **pbp, char *endptr, char *valBuf, int valBufSize)
{
char *bp, *valBufp;
int vallen = 0;
PRBool isQuoted;
PORT_Assert(valBufSize > 0);
/* skip optional leading space */
skipSpace(pbp, endptr);
if(*pbp == endptr) {
/* nothing left */
return 0;
}
bp = *pbp;
/* quoted? */
if (*bp == C_DOUBLE_QUOTE) {
isQuoted = PR_TRUE;
/* skip over it */
bp++;
} else {
isQuoted = PR_FALSE;
}
valBufp = valBuf;
while (bp < endptr) {
char c = *bp;
if (c == C_BACKSLASH) {
/* escape character */
bp++;
if (bp >= endptr) {
/* escape charater must appear with paired char */
*pbp = bp;
return 0;
}
c = *bp;
if (IS_HEX(c) && (endptr - bp) >= 2 && IS_HEX(bp[1])) {
bp++;
c = (char)((x2b[(PRUint8)c] << 4) | x2b[(PRUint8)*bp]);
}
} else if (c == '#' && bp == *pbp) {
/* ignore leading #, quotation not required for it. */
} else if (!isQuoted && SPECIAL_CHAR(c)) {
/* unescaped special and not within quoted value */
break;
} else if (c == C_DOUBLE_QUOTE) {
/* reached unescaped double quote */
break;
}
/* append character */
vallen++;
if (vallen >= valBufSize) {
*pbp = bp;
return 0;
}
*valBufp++ = c;
bp++;
}
/* strip trailing spaces from unquoted values */
if (!isQuoted) {
while (valBufp > valBuf) {
char c = valBufp[-1];
if (! OPTIONAL_SPACE(c))
break;
--valBufp;
}
vallen = valBufp - valBuf;
}
if (isQuoted) {
/* insist that we stopped on a double quote */
if (*bp != C_DOUBLE_QUOTE) {
*pbp = bp;
return 0;
}
/* skip over the quote and skip optional space */
bp++;
skipSpace(&bp, endptr);
}
*pbp = bp;
/* null-terminate valBuf -- guaranteed at least one space left */
*valBufp = 0;
return vallen;
}
