Fixing markdown licensing && compilation issues.

2019-02-02 14:25:25 +08:00
parent 1c76f2653b
commit 495dbf2ba2
37 changed files with 23485 additions and 26 deletions
--- a/include/cmark/houdini_href_e.c
+++ b/include/cmark/houdini_href_e.c
@@ -0,0 +1,100 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "houdini.h"
+
+/*
+ * 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 char HREF_SAFE[] = {
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 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,
+};
+
+int houdini_escape_href(cmark_strbuf *ob, const uint8_t *src, bufsize_t size) {
+  static const uint8_t hex_chars[] = "0123456789ABCDEF";
+  bufsize_t i = 0, org;
+  uint8_t hex_str[3];
+
+  hex_str[0] = '%';
+
+  while (i < size) {
+    org = i;
+    while (i < size && HREF_SAFE[src[i]] != 0)
+      i++;
+
+    if (likely(i > org))
+      cmark_strbuf_put(ob, src + org, i - org);
+
+    /* escaping */
+    if (i >= size)
+      break;
+
+    switch (src[i]) {
+    /* amp appears all the time in URLs, but needs
+     * HTML-entity escaping to be inside an href */
+    case '&':
+      cmark_strbuf_puts(ob, "&amp;");
+      break;
+
+    /* the single quote is a valid URL character
+     * according to the standard; it needs HTML
+     * entity escaping too */
+    case '\'':
+      cmark_strbuf_puts(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 ' ':
+			cmark_strbuf_putc(ob, '+');
+			break;
+#endif
+
+    /* every other character goes with a %XX escaping */
+    default:
+      hex_str[1] = hex_chars[(src[i] >> 4) & 0xF];
+      hex_str[2] = hex_chars[src[i] & 0xF];
+      cmark_strbuf_put(ob, hex_str, 3);
+    }
+
+    i++;
+  }
+
+  return 1;
+}