1 files changed, 109 insertions, 0 deletions
diff --git a/third_party/dav1d/tools/input/parse.h b/third_party/dav1d/tools/input/parse.h
new file mode 100644
index 0000000000..f5805e8ca4
--- /dev/null
+++ b/third_party/dav1d/tools/input/parse.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Two Orioles, LLC
+ * Copyright © 2019, James Almer <jamrial@gmail.com>
+ * 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 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.
+ */
+
+#ifndef DAV1D_INPUT_PARSE_H
+#define DAV1D_INPUT_PARSE_H
+
+#include <limits.h>
+
+#include "dav1d/headers.h"
+
+static int leb128(FILE *const f, size_t *const len) {
+    uint64_t val = 0;
+    unsigned i = 0, more;
+    do {
+        uint8_t v;
+        if (fread(&v, 1, 1, f) < 1)
+            return -1;
+        more = v & 0x80;
+        val |= ((uint64_t) (v & 0x7F)) << (i * 7);
+        i++;
+    } while (more && i < 8);
+    if (val > UINT_MAX || more)
+        return -1;
+    *len = (size_t) val;
+    return i;
+}
+
+// these functions are based on an implementation from FFmpeg, and relicensed
+// with author's permission
+
+static int leb(const uint8_t *ptr, int sz, size_t *const len) {
+    uint64_t val = 0;
+    unsigned i = 0, more;
+    do {
+        if (!sz--) return -1;
+        const int v = *ptr++;
+        more = v & 0x80;
+        val |= ((uint64_t) (v & 0x7F)) << (i * 7);
+        i++;
+    } while (more && i < 8);
+    if (val > UINT_MAX || more)
+        return -1;
+    *len = (size_t) val;
+    return i;
+}
+
+static inline int parse_obu_header(const uint8_t *buf, int buf_size,
+                                   size_t *const obu_size,
+                                   enum Dav1dObuType *const type,
+                                   const int allow_implicit_size)
+{
+    int ret, extension_flag, has_size_flag;
+
+    if (!buf_size)
+        return -1;
+    if (*buf & 0x80) // obu_forbidden_bit
+        return -1;
+
+    *type = (*buf & 0x78) >> 3;
+    extension_flag = (*buf & 0x4) >> 2;
+    has_size_flag  = (*buf & 0x2) >> 1;
+    // ignore obu_reserved_1bit
+    buf++;
+    buf_size--;
+
+    if (extension_flag) {
+        buf++;
+        buf_size--;
+        // ignore fields
+    }
+
+    if (has_size_flag) {
+        ret = leb(buf, buf_size, obu_size);
+        if (ret < 0)
+            return -1;
+        return (int) *obu_size + ret + 1 + extension_flag;
+    } else if (!allow_implicit_size)
+        return -1;
+
+    *obu_size = buf_size;
+    return buf_size + 1 + extension_flag;
+}
+
+#endif /* DAV1D_INPUT_PARSE_H */