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Handle window size & lookback correctly

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This commit is contained in:
Marcus Holland-Moritz 2021-03-05 12:38:17 +01:00
parent c690abfa09
commit 1b716b5c5a
1 changed files with 13 additions and 9 deletions
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22
src/dwarfs/block_manager.cpp
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@ -268,13 +268,15 @@ void active_block::append(uint8_t const* p, size_t size) {
v.resize(offset + size);
::memcpy(v.data() + offset, p, size);
while (offset < v.size()) {
if (DWARFS_UNLIKELY(offset < window_size_)) {
hasher_.update(v[offset++]);
} else {
hasher_.update(v[offset - window_size_], v[offset]);
if (DWARFS_UNLIKELY((++offset & window_step_mask_) == 0)) {
offsets_.insert(hasher_(), offset - window_size_);
if (window_size_ > 0) {
while (offset < v.size()) {
if (DWARFS_UNLIKELY(offset < window_size_)) {
hasher_.update(v[offset++]);
} else {
hasher_.update(v[offset - window_size_], v[offset]);
if (DWARFS_UNLIKELY((++offset & window_step_mask_) == 0)) {
offsets_.insert(hasher_(), offset - window_size_);
}
}
}
}
@ -317,7 +319,8 @@ void block_manager_<LoggerPolicy>::add_inode(std::shared_ptr<inode> ino) {
LOG_TRACE << "adding inode " << ino->num() << " [" << ino->any()->name()
<< "] - size: " << size;
if (window_size_ == 0 or size < window_size_) {
if (cfg_.max_active_blocks == 0 or window_size_ == 0 or
size < window_size_) {
// no point dealing with hashing, just write it out
add_data(*ino, *mm, 0, size);
finish_chunk(*ino);
@ -373,7 +376,8 @@ void block_manager_<LoggerPolicy>::append_to_block(inode& ino, mmif& mm,
blocks_.pop_front();
}
blocks_.emplace_back(block_count_++, block_size_, window_size_,
blocks_.emplace_back(block_count_++, block_size_,
cfg_.max_active_blocks > 0 ? window_size_ : 0,
window_step_);
}