mirror of
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118 lines
3.0 KiB
C++
118 lines
3.0 KiB
C++
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <algorithm>
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#include "base/format_macros.h"
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#include "base/logging.h"
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#include "base/strings/stringprintf.h"
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#include "net/http/http_byte_range.h"
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namespace {
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const int64_t kPositionNotSpecified = -1;
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} // namespace
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namespace net {
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HttpByteRange::HttpByteRange()
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: first_byte_position_(kPositionNotSpecified),
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last_byte_position_(kPositionNotSpecified),
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suffix_length_(kPositionNotSpecified),
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has_computed_bounds_(false) {
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}
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// static
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HttpByteRange HttpByteRange::Bounded(int64_t first_byte_position,
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int64_t last_byte_position) {
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HttpByteRange range;
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range.set_first_byte_position(first_byte_position);
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range.set_last_byte_position(last_byte_position);
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return range;
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}
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// static
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HttpByteRange HttpByteRange::RightUnbounded(int64_t first_byte_position) {
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HttpByteRange range;
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range.set_first_byte_position(first_byte_position);
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return range;
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}
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// static
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HttpByteRange HttpByteRange::Suffix(int64_t suffix_length) {
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HttpByteRange range;
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range.set_suffix_length(suffix_length);
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return range;
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}
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bool HttpByteRange::IsSuffixByteRange() const {
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return suffix_length_ != kPositionNotSpecified;
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}
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bool HttpByteRange::HasFirstBytePosition() const {
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return first_byte_position_ != kPositionNotSpecified;
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}
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bool HttpByteRange::HasLastBytePosition() const {
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return last_byte_position_ != kPositionNotSpecified;
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}
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bool HttpByteRange::IsValid() const {
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if (suffix_length_ > 0)
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return true;
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return (first_byte_position_ >= 0 &&
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(last_byte_position_ == kPositionNotSpecified ||
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last_byte_position_ >= first_byte_position_));
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}
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std::string HttpByteRange::GetHeaderValue() const {
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DCHECK(IsValid());
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if (IsSuffixByteRange())
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return base::StringPrintf("bytes=-%" PRId64, suffix_length());
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DCHECK(HasFirstBytePosition());
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if (!HasLastBytePosition())
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return base::StringPrintf("bytes=%" PRId64 "-", first_byte_position());
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return base::StringPrintf("bytes=%" PRId64 "-%" PRId64,
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first_byte_position(), last_byte_position());
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}
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bool HttpByteRange::ComputeBounds(int64_t size) {
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if (size < 0)
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return false;
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if (has_computed_bounds_)
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return false;
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has_computed_bounds_ = true;
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// Empty values.
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if (!HasFirstBytePosition() &&
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!HasLastBytePosition() &&
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!IsSuffixByteRange()) {
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first_byte_position_ = 0;
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last_byte_position_ = size - 1;
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return true;
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}
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if (!IsValid())
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return false;
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if (IsSuffixByteRange()) {
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first_byte_position_ = size - std::min(size, suffix_length_);
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last_byte_position_ = size - 1;
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return true;
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}
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if (first_byte_position_ < size) {
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if (HasLastBytePosition())
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last_byte_position_ = std::min(size - 1, last_byte_position_);
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else
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last_byte_position_ = size - 1;
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return true;
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}
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return false;
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}
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} // namespace net
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