diff options
Diffstat (limited to 'net/http/http_byte_range.cc')
-rw-r--r-- | net/http/http_byte_range.cc | 76 |
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 index 0000000..8978d9a --- /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 |