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-rw-r--r--net/http/http_byte_range.cc76
1 files changed, 76 insertions, 0 deletions
diff --git a/net/http/http_byte_range.cc b/net/http/http_byte_range.cc
new file mode 100644
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--- /dev/null
+++ b/net/http/http_byte_range.cc
@@ -0,0 +1,76 @@
+// Copyright (c) 2009 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 <algorithm>
+
+#include "net/http/http_byte_range.h"
+
+namespace {
+
+const int64 kPositionNotSpecified = -1;
+
+} // namespace
+
+namespace net {
+
+HttpByteRange::HttpByteRange()
+ : first_byte_position_(kPositionNotSpecified),
+ last_byte_position_(kPositionNotSpecified),
+ suffix_length_(kPositionNotSpecified),
+ has_computed_bounds_(false) {
+}
+
+bool HttpByteRange::IsSuffixByteRange() const {
+ return suffix_length_ != kPositionNotSpecified;
+}
+
+bool HttpByteRange::HasFirstBytePosition() const {
+ return first_byte_position_ != kPositionNotSpecified;
+}
+
+bool HttpByteRange::HasLastBytePosition() const {
+ return last_byte_position_ != kPositionNotSpecified;
+}
+
+bool HttpByteRange::IsValid() const {
+ if (suffix_length_ > 0)
+ return true;
+ return first_byte_position_ >= 0 &&
+ (last_byte_position_ == kPositionNotSpecified ||
+ last_byte_position_ >= first_byte_position_);
+}
+
+bool HttpByteRange::ComputeBounds(int64 size) {
+ if (size < 0)
+ return false;
+ if (has_computed_bounds_)
+ return false;
+ has_computed_bounds_ = true;
+
+ // Empty values.
+ if (!HasFirstBytePosition() &&
+ !HasLastBytePosition() &&
+ !IsSuffixByteRange()) {
+ first_byte_position_ = 0;
+ last_byte_position_ = size - 1;
+ return true;
+ }
+ if (!IsValid())
+ return false;
+ if (IsSuffixByteRange()) {
+ first_byte_position_ = size - std::min(size, suffix_length_);
+ last_byte_position_ = size - 1;
+ return true;
+ }
+ if (first_byte_position_ < size) {
+ if (HasLastBytePosition())
+ last_byte_position_ = std::min(size - 1, last_byte_position_);
+ else
+ last_byte_position_ = size - 1;
+ return true;
+ }
+ return false;
+}
+
+} // namespace net