Factor out QPACK absolute, relative, and post-base index conversion functions, and add new ones.
gfe-relnote: n/a, change to QUIC v99-only code. Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99.
PiperOrigin-RevId: 263421099
Change-Id: I762c3105da671f9d01ba5971c57a2f89f130ebbf
diff --git a/quic/core/qpack/qpack_index_conversions.cc b/quic/core/qpack/qpack_index_conversions.cc
new file mode 100644
index 0000000..8f1d52f
--- /dev/null
+++ b/quic/core/qpack/qpack_index_conversions.cc
@@ -0,0 +1,62 @@
+// Copyright (c) 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/third_party/quiche/src/quic/core/qpack/qpack_index_conversions.h"
+
+#include <limits>
+
+#include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
+
+namespace quic {
+
+uint64_t QpackAbsoluteIndexToEncoderStreamRelativeIndex(
+ uint64_t absolute_index,
+ uint64_t inserted_entry_count) {
+ DCHECK_LT(absolute_index, inserted_entry_count);
+
+ return inserted_entry_count - absolute_index - 1;
+}
+
+uint64_t QpackAbsoluteIndexToRequestStreamRelativeIndex(uint64_t absolute_index,
+ uint64_t base) {
+ DCHECK_LT(absolute_index, base);
+
+ return base - absolute_index - 1;
+}
+
+bool QpackEncoderStreamRelativeIndexToAbsoluteIndex(
+ uint64_t relative_index,
+ uint64_t inserted_entry_count,
+ uint64_t* absolute_index) {
+ if (relative_index >= inserted_entry_count) {
+ return false;
+ }
+
+ *absolute_index = inserted_entry_count - relative_index - 1;
+ return true;
+}
+
+bool QpackRequestStreamRelativeIndexToAbsoluteIndex(uint64_t relative_index,
+ uint64_t base,
+ uint64_t* absolute_index) {
+ if (relative_index >= base) {
+ return false;
+ }
+
+ *absolute_index = base - relative_index - 1;
+ return true;
+}
+
+bool QpackPostBaseIndexToAbsoluteIndex(uint64_t post_base_index,
+ uint64_t base,
+ uint64_t* absolute_index) {
+ if (post_base_index >= std::numeric_limits<uint64_t>::max() - base) {
+ return false;
+ }
+
+ *absolute_index = base + post_base_index;
+ return true;
+}
+
+} // namespace quic
