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Diffstat (limited to 'src/html/houdini_html_u.c')
-rw-r--r--src/html/houdini_html_u.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/src/html/houdini_html_u.c b/src/html/houdini_html_u.c
new file mode 100644
index 0000000..49b4956
--- /dev/null
+++ b/src/html/houdini_html_u.c
@@ -0,0 +1,111 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "houdini.h"
+#include "utf8.h"
+#include "html_unescape.h"
+
+size_t
+houdini_unescape_ent(strbuf *ob, const uint8_t *src, size_t size)
+{
+ size_t i = 0;
+
+ if (size > 3 && src[0] == '#') {
+ int codepoint = 0;
+
+ if (_isdigit(src[1])) {
+ for (i = 1; i < size && _isdigit(src[i]); ++i) {
+ int cp = (codepoint * 10) + (src[i] - '0');
+
+ if (cp < codepoint)
+ return 0;
+
+ codepoint = cp;
+ }
+ }
+
+ else if (src[1] == 'x' || src[1] == 'X') {
+ for (i = 2; i < size && _isxdigit(src[i]); ++i) {
+ int cp = (codepoint * 16) + ((src[i] | 32) % 39 - 9);
+
+ if (cp < codepoint)
+ return 0;
+
+ codepoint = cp;
+ }
+ }
+
+ if (i < size && src[i] == ';' && codepoint) {
+ utf8proc_encode_char(codepoint, ob);
+ return i + 1;
+ }
+ }
+
+ else {
+ if (size > MAX_WORD_LENGTH)
+ size = MAX_WORD_LENGTH;
+
+ for (i = MIN_WORD_LENGTH; i < size; ++i) {
+ if (src[i] == ' ')
+ break;
+
+ if (src[i] == ';') {
+ const struct html_ent *entity = find_entity((char *)src, i);
+
+ if (entity != NULL) {
+ strbuf_put(ob, entity->utf8, entity->utf8_len);
+ return i + 1;
+ }
+
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
+int
+houdini_unescape_html(strbuf *ob, const uint8_t *src, size_t size)
+{
+ size_t i = 0, org, ent;
+
+ while (i < size) {
+ org = i;
+ while (i < size && src[i] != '&')
+ i++;
+
+ if (likely(i > org)) {
+ if (unlikely(org == 0)) {
+ if (i >= size)
+ return 0;
+
+ strbuf_grow(ob, HOUDINI_UNESCAPED_SIZE(size));
+ }
+
+ strbuf_put(ob, src + org, i - org);
+ }
+
+ /* escaping */
+ if (i >= size)
+ break;
+
+ i++;
+
+ ent = houdini_unescape_ent(ob, src + i, size - i);
+ i += ent;
+
+ /* not really an entity */
+ if (ent == 0)
+ strbuf_putc(ob, '&');
+ }
+
+ return 1;
+}
+
+void houdini_unescape_html_f(strbuf *ob, const uint8_t *src, size_t size)
+{
+ if (!houdini_unescape_html(ob, src, size))
+ strbuf_put(ob, src, size);
+}