1 files changed, 141 insertions, 0 deletions
diff --git a/misc/uuid.c b/misc/uuid.c
new file mode 100644
index 0000000000..c739b3cf08
--- /dev/null
+++ b/misc/uuid.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com>
+ *                    Zane van Iperen <zane@zanevaniperen.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * Copyright (C) 1996, 1997 Theodore Ts'o.
+ *
+ * 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, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
+ * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
+/**
+ * @file
+ * UUID parsing and serialization utilities.
+ * The library treat the UUID as an opaque sequence of 16 unsigned bytes,
+ * i.e. ignoring the internal layout of the UUID, which depends on the type
+ * of the UUID.
+ *
+ * @author Pierre-Anthony Lemieux <pal@palemieux.com>
+ * @author Zane van Iperen <zane@zanevaniperen.com>
+ */
+
+#include "uuid.h"
+#include "libavutil/error.h"
+#include "libavutil/avstring.h"
+
+int av_uuid_parse(const char *in, AVUUID uu)
+{
+    if (strlen(in) != 36)
+        return AVERROR(EINVAL);
+
+    return av_uuid_parse_range(in, in + 36, uu);
+}
+
+static int xdigit_to_int(char c)
+{
+    c = av_tolower(c);
+
+    if (c >= 'a' && c <= 'f')
+        return c - 'a' + 10;
+
+    if (c >= '0' && c <= '9')
+        return c - '0';
+
+    return -1;
+}
+
+int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu)
+{
+    int i;
+    const char *cp;
+
+    if ((in_end - in_start) != 36)
+        return AVERROR(EINVAL);
+
+    for (i = 0, cp = in_start; i < 16; i++) {
+        int hi;
+        int lo;
+
+        if (i == 4 || i == 6 || i == 8 || i == 10)
+            cp++;
+
+        hi = xdigit_to_int(*cp++);
+        lo = xdigit_to_int(*cp++);
+
+        if (hi == -1 || lo == -1)
+            return AVERROR(EINVAL);
+
+        uu[i] = (hi << 4) + lo;
+    }
+
+    return 0;
+}
+
+static const char hexdigits_lower[16] = "0123456789abcdef";
+
+void av_uuid_unparse(const AVUUID uuid, char *out)
+{
+    char *p = out;
+
+    for (int i = 0; i < 16; i++) {
+        uint8_t tmp;
+
+        if (i == 4 || i == 6 || i == 8 || i == 10)
+            *p++ = '-';
+
+        tmp = uuid[i];
+        *p++ = hexdigits_lower[tmp >> 4];
+        *p++ = hexdigits_lower[tmp & 15];
+    }
+
+    *p = '\0';
+}
+
+int av_uuid_urn_parse(const char *in, AVUUID uu)
+{
+    if (av_stristr(in, "urn:uuid:") != in)
+        return AVERROR(EINVAL);
+
+    return av_uuid_parse(in + 9, uu);
+}