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server/vendor/github.com/pion/srtp/v2/util.go

@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package srtp
+
+import "bytes"
+
+// Grow the buffer size to the given number of bytes.
+func growBufferSize(buf []byte, size int) []byte {
+	if size <= cap(buf) {
+		return buf[:size]
+	}
+
+	buf2 := make([]byte, size)
+	copy(buf2, buf)
+	return buf2
+}
+
+// Check if buffers match, if not allocate a new buffer and return it
+func allocateIfMismatch(dst, src []byte) []byte {
+	if dst == nil {
+		dst = make([]byte, len(src))
+		copy(dst, src)
+	} else if !bytes.Equal(dst, src) { // bytes.Equal returns on ref equality, no optimization needed
+		extraNeeded := len(src) - len(dst)
+		if extraNeeded > 0 {
+			dst = append(dst, make([]byte, extraNeeded)...)
+		} else if extraNeeded < 0 {
+			dst = dst[:len(dst)+extraNeeded]
+		}
+
+		copy(dst, src)
+	}
+
+	return dst
+}