bool SMessageCoder::encode( const char *inbuf, size_t insize,
char *outbuf, size_t *outsize )
{
// encode will append 1 byte delimiter
if (*outsize < insize + 1) {
return false;
}
size_t outidx = 0;
for (size_t i = 0; i < insize; ++i)
{
int escape = !!needEscape(inbuf[i]);
// escape will cost 1 more extra byte
// outsize will minus 1 for delimiter
// if out buffer is not big enough
// insize * 2 is a good option
if (outidx + escape >= *outsize - 1) {
return false;
}
if (escape) {
outbuf[outidx++] = m_escaper;
}
outbuf[outidx++] = inbuf[i];
}
outbuf[outidx++] = m_delimiter;
*outsize = outidx;
return true;
}
/* COMMAND "escape": this function applies the URI escaping rules defined in
* section 2 of [RFC 3986] to the string supplied as 's'.
* The effect of the function is to escape a set of identified characters in
* the string. Each such character is replaced in the string by an escape
* sequence, which is formed by encoding the character as a sequence of octets
* in UTF-8, and then reprensenting each of these octets in the form %HH.
*
* All characters are escaped other than:
* [a-z], [A-Z], [0-9], "#", "-", "_", ".", "!", "~", "*", "'", "(", ")"
*
* This function must always generate hexadecimal values using the upper-case
* letters A-F.
*
* SIGNATURE: escape(str) : str; */
str
escape_str(str *retval, str s)
{
int x, y;
str res;
if (!s)
throw(ILLARG, "url.escape", "url missing");
if (!( res = (str) GDKmalloc( strlen(s) * 3 ) ))
throw(MAL, "url.escape", "malloc failed");
for (x = 0, y = 0; s[x]; ++x, ++y) {
if (needEscape(s[x])) {
if (s[x] == ' ') {
res[y] = '+';
} else {
sprintf(res+y, "%%%2x", s[x]);
y += 2;
}
} else {
res[y] = s[x];
}
}
res[y] = '\0';
*retval = GDKrealloc(res, strlen(res)+1);
return MAL_SUCCEED;
}