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#include "ruby.h"
#include "ruby/encoding.h"
RUBY_EXTERN const char ruby_hexdigits[];
#define lower_hexdigits (ruby_hexdigits+0)
#define upper_hexdigits (ruby_hexdigits+16)
static VALUE rb_cCGI, rb_mUtil, rb_mEscape;
static void
html_escaped_cat(VALUE str, char c)
{
switch (c) {
case '\'':
rb_str_cat_cstr(str, "'");
break;
case '&':
rb_str_cat_cstr(str, "&");
break;
case '"':
rb_str_cat_cstr(str, """);
break;
case '<':
rb_str_cat_cstr(str, "<");
break;
case '>':
rb_str_cat_cstr(str, ">");
break;
}
}
static inline void
preserve_original_state(VALUE orig, VALUE dest)
{
rb_enc_associate(dest, rb_enc_get(orig));
RB_OBJ_INFECT_RAW(dest, orig);
}
static VALUE
optimized_escape_html(VALUE str)
{
long i, len, beg = 0;
VALUE dest = 0;
const char *cstr;
len = RSTRING_LEN(str);
cstr = RSTRING_PTR(str);
for (i = 0; i < len; i++) {
switch (cstr[i]) {
case '\'':
case '&':
case '"':
case '<':
case '>':
if (!dest) {
dest = rb_str_buf_new(len);
}
rb_str_cat(dest, cstr + beg, i - beg);
beg = i + 1;
html_escaped_cat(dest, cstr[i]);
break;
}
}
if (dest) {
rb_str_cat(dest, cstr + beg, len - beg);
preserve_original_state(str, dest);
return dest;
}
else {
return rb_str_dup(str);
}
}
static int
url_unreserved_char(unsigned char c)
{
switch (c) {
case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
case '-': case '.': case '_':
return 1;
default:
break;
}
return 0;
}
static VALUE
optimized_escape(VALUE str)
{
long i, len, beg = 0;
VALUE dest = 0;
const char *cstr;
char buf[4] = {'%'};
len = RSTRING_LEN(str);
cstr = RSTRING_PTR(str);
for (i = 0; i < len; i++) {
if (!url_unreserved_char(cstr[i])) {
if (!dest) {
dest = rb_str_buf_new(len);
}
rb_str_cat(dest, cstr + beg, i - beg);
beg = i + 1;
if (cstr[i] == ' ') {
rb_str_cat_cstr(dest, "+");
}
else {
unsigned char c = (unsigned char)cstr[i];
buf[1] = upper_hexdigits[c >> 4];
buf[2] = upper_hexdigits[c & 0xf];
rb_str_cat(dest, buf, 3);
}
}
}
if (dest) {
rb_str_cat(dest, cstr + beg, len - beg);
preserve_original_state(str, dest);
return dest;
}
else {
return rb_str_dup(str);
}
}
/*
* call-seq:
* CGI.escapeHTML(string) -> string
*
* Returns HTML-escaped string.
*
*/
static VALUE
cgiesc_escape_html(VALUE self, VALUE str)
{
StringValue(str);
if (rb_enc_str_asciicompat_p(str)) {
return optimized_escape_html(str);
}
else {
return rb_call_super(1, &str);
}
}
/*
* call-seq:
* CGI.escape(string) -> string
*
* Returns URL-escaped string.
*
*/
static VALUE
cgiesc_escape(VALUE self, VALUE str)
{
StringValue(str);
if (rb_enc_str_asciicompat_p(str)) {
return optimized_escape(str);
}
else {
return rb_call_super(1, &str);
}
}
void
Init_escape(void)
{
rb_cCGI = rb_define_class("CGI", rb_cObject);
rb_mEscape = rb_define_module_under(rb_cCGI, "Escape");
rb_mUtil = rb_define_module_under(rb_cCGI, "Util");
rb_define_method(rb_mEscape, "escapeHTML", cgiesc_escape_html, 1);
rb_define_method(rb_mEscape, "escape", cgiesc_escape, 1);
rb_prepend_module(rb_mUtil, rb_mEscape);
rb_extend_object(rb_cCGI, rb_mEscape);
}
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