Spectral/include/hoedown/escape.c

#include "escape.h"

#include <assert.h>
#include <stdio.h>
#include <string.h>


#define likely(x)       __builtin_expect((x),1)
#define unlikely(x)     __builtin_expect((x),0)


/*
 * The following characters will not be escaped:
 *
 *		-_.+!*'(),%#@?=;:/,+&$ alphanum
 *
 * Note that this character set is the addition of:
 *
 *	- The characters which are safe to be in an URL
 *	- The characters which are *not* safe to be in
 *	an URL because they are RESERVED characters.
 *
 * We assume (lazily) that any RESERVED char that
 * appears inside an URL is actually meant to
 * have its native function (i.e. as an URL
 * component/separator) and hence needs no escaping.
 *
 * There are two exceptions: the chacters & (amp)
 * and ' (single quote) do not appear in the table.
 * They are meant to appear in the URL as components,
 * yet they require special HTML-entity escaping
 * to generate valid HTML markup.
 *
 * All other characters will be escaped to %XX.
 *
 */
static const uint8_t HREF_SAFE[UINT8_MAX+1] = {
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};

void
hoedown_escape_href(hoedown_buffer *ob, const uint8_t *data, size_t size)
{
	static const char hex_chars[] = "0123456789ABCDEF";
	size_t  i = 0, mark;
	char hex_str[3];

	hex_str[0] = '%';

	while (i < size) {
		mark = i;
		while (i < size && HREF_SAFE[data[i]]) i++;

		/* Optimization for cases where there's nothing to escape */
		if (mark == 0 && i >= size) {
			hoedown_buffer_put(ob, data, size);
			return;
		}

		if (likely(i > mark)) {
			hoedown_buffer_put(ob, data + mark, i - mark);
		}

		/* escaping */
		if (i >= size)
			break;

		switch (data[i]) {
		/* amp appears all the time in URLs, but needs
		 * HTML-entity escaping to be inside an href */
		case '&':
			HOEDOWN_BUFPUTSL(ob, "&amp;");
			break;

		/* the single quote is a valid URL character
		 * according to the standard; it needs HTML
		 * entity escaping too */
		case '\'':
			HOEDOWN_BUFPUTSL(ob, "&#x27;");
			break;

		/* the space can be escaped to %20 or a plus
		 * sign. we're going with the generic escape
		 * for now. the plus thing is more commonly seen
		 * when building GET strings */
#if 0
		case ' ':
			hoedown_buffer_putc(ob, '+');
			break;
#endif

		/* every other character goes with a %XX escaping */
		default:
			hex_str[1] = hex_chars[(data[i] >> 4) & 0xF];
			hex_str[2] = hex_chars[data[i] & 0xF];
			hoedown_buffer_put(ob, (uint8_t *)hex_str, 3);
		}

		i++;
	}
}


/**
 * According to the OWASP rules:
 *
 * & --> &amp;
 * < --> &lt;
 * > --> &gt;
 * " --> &quot;
 * ' --> &#x27;     &apos; is not recommended
 * / --> &#x2F;     forward slash is included as it helps end an HTML entity
 *
 */
static const uint8_t HTML_ESCAPE_TABLE[UINT8_MAX+1] = {
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 1, 0, 0, 0, 2, 3, 0, 0, 0, 0, 0, 0, 0, 4,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 6, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};

static const char *HTML_ESCAPES[] = {
        "",
        "&quot;",
        "&amp;",
        "&#39;",
        "&#47;",
        "&lt;",
        "&gt;"
};

void
hoedown_escape_html(hoedown_buffer *ob, const uint8_t *data, size_t size, int secure)
{
	size_t i = 0, mark;

	while (1) {
		mark = i;
		while (i < size && HTML_ESCAPE_TABLE[data[i]] == 0) i++;

		/* Optimization for cases where there's nothing to escape */
		if (mark == 0 && i >= size) {
			hoedown_buffer_put(ob, data, size);
			return;
		}

		if (likely(i > mark))
			hoedown_buffer_put(ob, data + mark, i - mark);

		if (i >= size) break;

		/* The forward slash is only escaped in secure mode */
		if (!secure && data[i] == '/') {
			hoedown_buffer_putc(ob, '/');
		} else {
			hoedown_buffer_puts(ob, HTML_ESCAPES[HTML_ESCAPE_TABLE[data[i]]]);
		}

		i++;
	}
}