Includes cmark markdown parser library.

1 files changed, 317 insertions, 0 deletions

diff --git a/lib/cmark/src/utf8.c b/lib/cmark/src/utf8.c
new file mode 100644
index 0000000..c29bbf7
--- /dev/null
+++ b/lib/cmark/src/utf8.c
@@ -0,0 +1,317 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <assert.h>
+
+#include "cmark_ctype.h"
+#include "utf8.h"
+
+static const int8_t utf8proc_utf8class[256] = {
+    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, 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, 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, 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, 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,
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+    2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+    4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0};
+
+static void encode_unknown(cmark_strbuf *buf) {
+  static const uint8_t repl[] = {239, 191, 189};
+  cmark_strbuf_put(buf, repl, 3);
+}
+
+static int utf8proc_charlen(const uint8_t *str, bufsize_t str_len) {
+  int length, i;
+
+  if (!str_len)
+    return 0;
+
+  length = utf8proc_utf8class[str[0]];
+
+  if (!length)
+    return -1;
+
+  if (str_len >= 0 && (bufsize_t)length > str_len)
+    return -str_len;
+
+  for (i = 1; i < length; i++) {
+    if ((str[i] & 0xC0) != 0x80)
+      return -i;
+  }
+
+  return length;
+}
+
+// Validate a single UTF-8 character according to RFC 3629.
+static int utf8proc_valid(const uint8_t *str, bufsize_t str_len) {
+  int length = utf8proc_utf8class[str[0]];
+
+  if (!length)
+    return -1;
+
+  if ((bufsize_t)length > str_len)
+    return -str_len;
+
+  switch (length) {
+  case 2:
+    if ((str[1] & 0xC0) != 0x80)
+      return -1;
+    if (str[0] < 0xC2) {
+      // Overlong
+      return -length;
+    }
+    break;
+
+  case 3:
+    if ((str[1] & 0xC0) != 0x80)
+      return -1;
+    if ((str[2] & 0xC0) != 0x80)
+      return -2;
+    if (str[0] == 0xE0) {
+      if (str[1] < 0xA0) {
+        // Overlong
+        return -length;
+      }
+    } else if (str[0] == 0xED) {
+      if (str[1] >= 0xA0) {
+        // Surrogate
+        return -length;
+      }
+    }
+    break;
+
+  case 4:
+    if ((str[1] & 0xC0) != 0x80)
+      return -1;
+    if ((str[2] & 0xC0) != 0x80)
+      return -2;
+    if ((str[3] & 0xC0) != 0x80)
+      return -3;
+    if (str[0] == 0xF0) {
+      if (str[1] < 0x90) {
+        // Overlong
+        return -length;
+      }
+    } else if (str[0] >= 0xF4) {
+      if (str[0] > 0xF4 || str[1] >= 0x90) {
+        // Above 0x10FFFF
+        return -length;
+      }
+    }
+    break;
+  }
+
+  return length;
+}
+
+void cmark_utf8proc_check(cmark_strbuf *ob, const uint8_t *line,
+                          bufsize_t size) {
+  bufsize_t i = 0;
+
+  while (i < size) {
+    bufsize_t org = i;
+    int charlen = 0;
+
+    while (i < size) {
+      if (line[i] < 0x80 && line[i] != 0) {
+        i++;
+      } else if (line[i] >= 0x80) {
+        charlen = utf8proc_valid(line + i, size - i);
+        if (charlen < 0) {
+          charlen = -charlen;
+          break;
+        }
+        i += charlen;
+      } else if (line[i] == 0) {
+        // ASCII NUL is technically valid but rejected
+        // for security reasons.
+        charlen = 1;
+        break;
+      }
+    }
+
+    if (i > org) {
+      cmark_strbuf_put(ob, line + org, i - org);
+    }
+
+    if (i >= size) {
+      break;
+    } else {
+      // Invalid UTF-8
+      encode_unknown(ob);
+      i += charlen;
+    }
+  }
+}
+
+int cmark_utf8proc_iterate(const uint8_t *str, bufsize_t str_len,
+                           int32_t *dst) {
+  int length;
+  int32_t uc = -1;
+
+  *dst = -1;
+  length = utf8proc_charlen(str, str_len);
+  if (length < 0)
+    return -1;
+
+  switch (length) {
+  case 1:
+    uc = str[0];
+    break;
+  case 2:
+    uc = ((str[0] & 0x1F) << 6) + (str[1] & 0x3F);
+    if (uc < 0x80)
+      uc = -1;
+    break;
+  case 3:
+    uc = ((str[0] & 0x0F) << 12) + ((str[1] & 0x3F) << 6) + (str[2] & 0x3F);
+    if (uc < 0x800 || (uc >= 0xD800 && uc < 0xE000))
+      uc = -1;
+    break;
+  case 4:
+    uc = ((str[0] & 0x07) << 18) + ((str[1] & 0x3F) << 12) +
+         ((str[2] & 0x3F) << 6) + (str[3] & 0x3F);
+    if (uc < 0x10000 || uc >= 0x110000)
+      uc = -1;
+    break;
+  }
+
+  if (uc < 0)
+    return -1;
+
+  *dst = uc;
+  return length;
+}
+
+void cmark_utf8proc_encode_char(int32_t uc, cmark_strbuf *buf) {
+  uint8_t dst[4];
+  bufsize_t len = 0;
+
+  assert(uc >= 0);
+
+  if (uc < 0x80) {
+    dst[0] = (uint8_t)(uc);
+    len = 1;
+  } else if (uc < 0x800) {
+    dst[0] = (uint8_t)(0xC0 + (uc >> 6));
+    dst[1] = 0x80 + (uc & 0x3F);
+    len = 2;
+  } else if (uc == 0xFFFF) {
+    dst[0] = 0xFF;
+    len = 1;
+  } else if (uc == 0xFFFE) {
+    dst[0] = 0xFE;
+    len = 1;
+  } else if (uc < 0x10000) {
+    dst[0] = (uint8_t)(0xE0 + (uc >> 12));
+    dst[1] = 0x80 + ((uc >> 6) & 0x3F);
+    dst[2] = 0x80 + (uc & 0x3F);
+    len = 3;
+  } else if (uc < 0x110000) {
+    dst[0] = (uint8_t)(0xF0 + (uc >> 18));
+    dst[1] = 0x80 + ((uc >> 12) & 0x3F);
+    dst[2] = 0x80 + ((uc >> 6) & 0x3F);
+    dst[3] = 0x80 + (uc & 0x3F);
+    len = 4;
+  } else {
+    encode_unknown(buf);
+    return;
+  }
+
+  cmark_strbuf_put(buf, dst, len);
+}
+
+void cmark_utf8proc_case_fold(cmark_strbuf *dest, const uint8_t *str,
+                              bufsize_t len) {
+  int32_t c;
+
+#define bufpush(x) cmark_utf8proc_encode_char(x, dest)
+
+  while (len > 0) {
+    bufsize_t char_len = cmark_utf8proc_iterate(str, len, &c);
+
+    if (char_len >= 0) {
+#include "case_fold_switch.inc"
+    } else {
+      encode_unknown(dest);
+      char_len = -char_len;
+    }
+
+    str += char_len;
+    len -= char_len;
+  }
+}
+
+// matches anything in the Zs class, plus LF, CR, TAB, FF.
+int cmark_utf8proc_is_space(int32_t uc) {
+  return (uc == 9 || uc == 10 || uc == 12 || uc == 13 || uc == 32 ||
+          uc == 160 || uc == 5760 || (uc >= 8192 && uc <= 8202) || uc == 8239 ||
+          uc == 8287 || uc == 12288);
+}
+
+// matches anything in the P[cdefios] classes.
+int cmark_utf8proc_is_punctuation(int32_t uc) {
+  return (
+      (uc < 128 && cmark_ispunct((char)uc)) || uc == 161 || uc == 167 ||
+      uc == 171 || uc == 182 || uc == 183 || uc == 187 || uc == 191 ||
+      uc == 894 || uc == 903 || (uc >= 1370 && uc <= 1375) || uc == 1417 ||
+      uc == 1418 || uc == 1470 || uc == 1472 || uc == 1475 || uc == 1478 ||
+      uc == 1523 || uc == 1524 || uc == 1545 || uc == 1546 || uc == 1548 ||
+      uc == 1549 || uc == 1563 || uc == 1566 || uc == 1567 ||
+      (uc >= 1642 && uc <= 1645) || uc == 1748 || (uc >= 1792 && uc <= 1805) ||
+      (uc >= 2039 && uc <= 2041) || (uc >= 2096 && uc <= 2110) || uc == 2142 ||
+      uc == 2404 || uc == 2405 || uc == 2416 || uc == 2800 || uc == 3572 ||
+      uc == 3663 || uc == 3674 || uc == 3675 || (uc >= 3844 && uc <= 3858) ||
+      uc == 3860 || (uc >= 3898 && uc <= 3901) || uc == 3973 ||
+      (uc >= 4048 && uc <= 4052) || uc == 4057 || uc == 4058 ||
+      (uc >= 4170 && uc <= 4175) || uc == 4347 || (uc >= 4960 && uc <= 4968) ||
+      uc == 5120 || uc == 5741 || uc == 5742 || uc == 5787 || uc == 5788 ||
+      (uc >= 5867 && uc <= 5869) || uc == 5941 || uc == 5942 ||
+      (uc >= 6100 && uc <= 6102) || (uc >= 6104 && uc <= 6106) ||
+      (uc >= 6144 && uc <= 6154) || uc == 6468 || uc == 6469 || uc == 6686 ||
+      uc == 6687 || (uc >= 6816 && uc <= 6822) || (uc >= 6824 && uc <= 6829) ||
+      (uc >= 7002 && uc <= 7008) || (uc >= 7164 && uc <= 7167) ||
+      (uc >= 7227 && uc <= 7231) || uc == 7294 || uc == 7295 ||
+      (uc >= 7360 && uc <= 7367) || uc == 7379 || (uc >= 8208 && uc <= 8231) ||
+      (uc >= 8240 && uc <= 8259) || (uc >= 8261 && uc <= 8273) ||
+      (uc >= 8275 && uc <= 8286) || uc == 8317 || uc == 8318 || uc == 8333 ||
+      uc == 8334 || (uc >= 8968 && uc <= 8971) || uc == 9001 || uc == 9002 ||
+      (uc >= 10088 && uc <= 10101) || uc == 10181 || uc == 10182 ||
+      (uc >= 10214 && uc <= 10223) || (uc >= 10627 && uc <= 10648) ||
+      (uc >= 10712 && uc <= 10715) || uc == 10748 || uc == 10749 ||
+      (uc >= 11513 && uc <= 11516) || uc == 11518 || uc == 11519 ||
+      uc == 11632 || (uc >= 11776 && uc <= 11822) ||
+      (uc >= 11824 && uc <= 11842) || (uc >= 12289 && uc <= 12291) ||
+      (uc >= 12296 && uc <= 12305) || (uc >= 12308 && uc <= 12319) ||
+      uc == 12336 || uc == 12349 || uc == 12448 || uc == 12539 || uc == 42238 ||
+      uc == 42239 || (uc >= 42509 && uc <= 42511) || uc == 42611 ||
+      uc == 42622 || (uc >= 42738 && uc <= 42743) ||
+      (uc >= 43124 && uc <= 43127) || uc == 43214 || uc == 43215 ||
+      (uc >= 43256 && uc <= 43258) || uc == 43310 || uc == 43311 ||
+      uc == 43359 || (uc >= 43457 && uc <= 43469) || uc == 43486 ||
+      uc == 43487 || (uc >= 43612 && uc <= 43615) || uc == 43742 ||
+      uc == 43743 || uc == 43760 || uc == 43761 || uc == 44011 || uc == 64830 ||
+      uc == 64831 || (uc >= 65040 && uc <= 65049) ||
+      (uc >= 65072 && uc <= 65106) || (uc >= 65108 && uc <= 65121) ||
+      uc == 65123 || uc == 65128 || uc == 65130 || uc == 65131 ||
+      (uc >= 65281 && uc <= 65283) || (uc >= 65285 && uc <= 65290) ||
+      (uc >= 65292 && uc <= 65295) || uc == 65306 || uc == 65307 ||
+      uc == 65311 || uc == 65312 || (uc >= 65339 && uc <= 65341) ||
+      uc == 65343 || uc == 65371 || uc == 65373 ||
+      (uc >= 65375 && uc <= 65381) || (uc >= 65792 && uc <= 65794) ||
+      uc == 66463 || uc == 66512 || uc == 66927 || uc == 67671 || uc == 67871 ||
+      uc == 67903 || (uc >= 68176 && uc <= 68184) || uc == 68223 ||
+      (uc >= 68336 && uc <= 68342) || (uc >= 68409 && uc <= 68415) ||
+      (uc >= 68505 && uc <= 68508) || (uc >= 69703 && uc <= 69709) ||
+      uc == 69819 || uc == 69820 || (uc >= 69822 && uc <= 69825) ||
+      (uc >= 69952 && uc <= 69955) || uc == 70004 || uc == 70005 ||
+      (uc >= 70085 && uc <= 70088) || uc == 70093 ||
+      (uc >= 70200 && uc <= 70205) || uc == 70854 ||
+      (uc >= 71105 && uc <= 71113) || (uc >= 71233 && uc <= 71235) ||
+      (uc >= 74864 && uc <= 74868) || uc == 92782 || uc == 92783 ||
+      uc == 92917 || (uc >= 92983 && uc <= 92987) || uc == 92996 ||
+      uc == 113823);
+}