summaryrefslogtreecommitdiff
path: root/trust/utf8.c
diff options
context:
space:
mode:
Diffstat (limited to 'trust/utf8.c')
-rw-r--r--trust/utf8.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/trust/utf8.c b/trust/utf8.c
new file mode 100644
index 0000000..b94c3e7
--- /dev/null
+++ b/trust/utf8.c
@@ -0,0 +1,329 @@
+/*
+ * Copyright (c) 2013, Red Hat Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the
+ * following disclaimer.
+ * * Redistributions in binary form must reproduce the
+ * above copyright notice, this list of conditions and
+ * the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.
+ * * The names of contributors to this software may not be
+ * used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Author: Stef Walter <stefw@redhat.com>
+ */
+
+#include "config.h"
+
+#include "buffer.h"
+#include "debug.h"
+#include "utf8.h"
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+/*
+ * Some parts come from FreeBSD utf8.c
+ *
+ * Copyright (c) 2002-2004 Tim J. Robbins
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+static ssize_t
+utf8_to_uchar (const char *str,
+ size_t len,
+ uint32_t *uc)
+{
+ int ch, i, mask, want;
+ uint32_t lbound, uch;
+
+ assert (str != NULL);
+ assert (len > 0);
+ assert (uc != NULL);
+
+ if (((ch = (unsigned char)*str) & ~0x7f) == 0) {
+ /* Fast path for plain ASCII characters. */
+ *uc = ch;
+ return 1;
+ }
+
+ /*
+ * Determine the number of octets that make up this character
+ * from the first octet, and a mask that extracts the
+ * interesting bits of the first octet. We already know
+ * the character is at least two bytes long.
+ *
+ * We also specify a lower bound for the character code to
+ * detect redundant, non-"shortest form" encodings. For
+ * example, the sequence C0 80 is _not_ a legal representation
+ * of the null character. This enforces a 1-to-1 mapping
+ * between character codes and their multibyte representations.
+ */
+ ch = (unsigned char)*str;
+ if ((ch & 0xe0) == 0xc0) {
+ mask = 0x1f;
+ want = 2;
+ lbound = 0x80;
+ } else if ((ch & 0xf0) == 0xe0) {
+ mask = 0x0f;
+ want = 3;
+ lbound = 0x800;
+ } else if ((ch & 0xf8) == 0xf0) {
+ mask = 0x07;
+ want = 4;
+ lbound = 0x10000;
+ } else if ((ch & 0xfc) == 0xf8) {
+ mask = 0x03;
+ want = 5;
+ lbound = 0x200000;
+ } else if ((ch & 0xfe) == 0xfc) {
+ mask = 0x01;
+ want = 6;
+ lbound = 0x4000000;
+ } else {
+ /*
+ * Malformed input; input is not UTF-8.
+ */
+ return -1;
+ }
+
+ if (want > len) {
+ /* Incomplete multibyte sequence. */
+ return -1;
+ }
+
+ /*
+ * Decode the octet sequence representing the character in chunks
+ * of 6 bits, most significant first.
+ */
+ uch = (unsigned char)*str++ & mask;
+ for (i = 1; i < want; i++) {
+ if ((*str & 0xc0) != 0x80) {
+ /*
+ * Malformed input; bad characters in the middle
+ * of a character.
+ */
+ return -1;
+ }
+ uch <<= 6;
+ uch |= *str++ & 0x3f;
+ }
+ if (uch < lbound) {
+ /*
+ * Malformed input; redundant encoding.
+ */
+ return -1;
+ }
+
+ *uc = uch;
+ return want;
+}
+
+static size_t
+utf8_for_uchar (uint32_t uc,
+ char *str,
+ size_t len)
+{
+ unsigned char lead;
+ int i, want;
+
+ assert (str != NULL);
+ assert (len >= 6);
+
+ if ((uc & ~0x7f) == 0) {
+ /* Fast path for plain ASCII characters. */
+ *str = (char)uc;
+ return 1;
+ }
+
+ /*
+ * Determine the number of octets needed to represent this character.
+ * We always output the shortest sequence possible. Also specify the
+ * first few bits of the first octet, which contains the information
+ * about the sequence length.
+ */
+ if ((uc & ~0x7ff) == 0) {
+ lead = 0xc0;
+ want = 2;
+ } else if ((uc & ~0xffff) == 0) {
+ lead = 0xe0;
+ want = 3;
+ } else if ((uc & ~0x1fffff) == 0) {
+ lead = 0xf0;
+ want = 4;
+ } else if ((uc & ~0x3ffffff) == 0) {
+ lead = 0xf8;
+ want = 5;
+ } else if ((uc & ~0x7fffffff) == 0) {
+ lead = 0xfc;
+ want = 6;
+ } else {
+ return -1;
+ }
+
+ assert (want <= len);
+
+ /*
+ * Output the octets representing the character in chunks
+ * of 6 bits, least significant last. The first octet is
+ * a special case because it contains the sequence length
+ * information.
+ */
+ for (i = want - 1; i > 0; i--) {
+ str[i] = (uc & 0x3f) | 0x80;
+ uc >>= 6;
+ }
+ *str = (uc & 0xff) | lead;
+ return want;
+}
+
+static ssize_t
+ucs2be_to_uchar (const unsigned char *str,
+ size_t len,
+ uint32_t *wc)
+{
+ assert (str != NULL);
+ assert (len != 0);
+ assert (wc != NULL);
+
+ if (len < 2)
+ return -1;
+
+ *wc = (str[0] << 8 | str[1]);
+ return 2;
+}
+
+static ssize_t
+ucs4be_to_uchar (const unsigned char *str,
+ size_t len,
+ uint32_t *uc)
+{
+ assert (str != NULL);
+ assert (len != 0);
+ assert (uc != NULL);
+
+ if (len < 4)
+ return -1;
+
+ *uc = (str[0] << 24 | str[1] << 16 | str[2] << 8 | str[3]);
+ return 4;
+}
+
+bool
+p11_utf8_validate (const char *str,
+ ssize_t len)
+{
+ uint32_t dummy;
+ ssize_t ret;
+
+ if (len < 0)
+ len = strlen (str);
+
+ while (len > 0) {
+ ret = utf8_to_uchar (str, len, &dummy);
+ if (ret < 0)
+ return false;
+ str += ret;
+ len -= ret;
+ }
+
+ return true;
+}
+
+static char *
+utf8_for_convert (ssize_t (* convert) (const unsigned char *, size_t, uint32_t *),
+ const unsigned char *str,
+ size_t num_bytes,
+ size_t *ret_len)
+{
+ p11_buffer buf;
+ char block[6];
+ uint32_t uc;
+ ssize_t ret;
+
+ assert (convert);
+
+ if (!p11_buffer_init_null (&buf, num_bytes))
+ return_val_if_reached (NULL);
+
+ while (num_bytes != 0) {
+ ret = (convert) (str, num_bytes, &uc);
+ if (ret < 0) {
+ p11_buffer_uninit (&buf);
+ return NULL;
+ }
+
+ str += ret;
+ num_bytes -= ret;
+
+ ret = utf8_for_uchar (uc, block, 6);
+ if (ret < 0) {
+ p11_buffer_uninit (&buf);
+ return NULL;
+ }
+ p11_buffer_add (&buf, block, ret);
+ }
+
+ return_val_if_fail (p11_buffer_ok (&buf), NULL);
+ return p11_buffer_steal (&buf, ret_len);
+}
+
+char *
+p11_utf8_for_ucs2be (const unsigned char *str,
+ size_t num_bytes,
+ size_t *ret_len)
+{
+ assert (str != NULL);
+ return utf8_for_convert (ucs2be_to_uchar, str, num_bytes, ret_len);
+}
+
+char *
+p11_utf8_for_ucs4be (const unsigned char *str,
+ size_t num_bytes,
+ size_t *ret_len)
+{
+ assert (str != NULL);
+ return utf8_for_convert (ucs4be_to_uchar, str, num_bytes, ret_len);
+}
generated by cgit v1.1 at 2024-12-26 07:00:02 +0000