[thin_scan] Factor out range manipulation code
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400613305c
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@ -151,10 +151,43 @@ namespace {
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value_size_(rhs.value_size_), is_valid_(rhs.is_valid_)
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{
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}
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uint64_t size() const {
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return (end_ > begin_) ? (end_ - begin_) : 0;
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}
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// returns true if r is left or right-adjacent
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bool is_adjacent_to(block_range const &r) const {
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block_range const &lhs = begin_ < r.begin_ ? *this : r;
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block_range const &rhs = begin_ < r.begin_ ? r : *this;
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uint64_t common_end = std::min(end_, r.end_);
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if (size() && r.size() &&
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rhs.begin_ == common_end &&
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((!blocknr_begin_ && !r.blocknr_begin_) ||
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(blocknr_begin_ && r.blocknr_begin_ &&
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*rhs.blocknr_begin_ > *lhs.blocknr_begin_ &&
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(*rhs.blocknr_begin_ - *lhs.blocknr_begin_ == rhs.begin_ - lhs.begin_))) &&
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type_ == r.type_ &&
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ref_count_ == r.ref_count_ &&
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value_size_ == r.value_size_ &&
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is_valid_ == r.is_valid_)
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return true;
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return false;
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}
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bool concat(block_range const &r) {
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if (!is_adjacent_to(r))
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return false;
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begin_ = std::min(begin_, r.begin_);
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end_ = std::max(end_, r.end_);
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return true;
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}
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};
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void output_block_range(block_range const &r, std::ostream &out) {
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if (r.end_ <= r.begin_)
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if (!r.size())
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return;
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if (r.end_ - r.begin_ > 1) {
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@ -288,18 +321,8 @@ namespace {
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curr_range.ref_count_ = -1;
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}
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// output the current block
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if (run_range.end_ == 0)
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run_range = curr_range;
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else if (((!curr_range.blocknr_begin_ && !run_range.blocknr_begin_) ||
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(curr_range.blocknr_begin_ && run_range.blocknr_begin_ &&
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*curr_range.blocknr_begin_ == *run_range.blocknr_begin_ + (run_range.end_ - run_range.begin_))) &&
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curr_range.type_ == run_range.type_ &&
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curr_range.ref_count_ == run_range.ref_count_ &&
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curr_range.value_size_ == run_range.value_size_ &&
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curr_range.is_valid_ == run_range.is_valid_) {
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++run_range.end_;
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} else {
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// store the current block
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if (!run_range.concat(curr_range)) {
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output_block_range(run_range, out);
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run_range = curr_range;
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}
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