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// 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
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