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Refactor segmenting

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This commit is contained in:
Marcus Holland-Moritz 2020-12-10 15:16:52 +01:00
parent 1970da345e
commit b4f559213f
1 changed files with 39 additions and 27 deletions
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66
src/dwarfs/block_manager.cpp
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@ -168,6 +168,12 @@ class block_manager_ : public block_manager::impl {
size_t& block_offset, const uint8_t* data,
const match_window& search_win) const;
void
validate_match(const std::string& indent, const uint8_t* data,
match_window& mw, const std::vector<cyclic_hash_t>& hashvec,
bm_stats& stats, size_t block_size, size_t block_offset,
size_t off, match_window& best, size_t& best_offset);
const block_manager::config& cfg_;
const size_t block_size_;
std::vector<size_t> blockhash_window_size_;
@ -387,6 +393,35 @@ void block_manager_<LoggerPolicy>::segment_and_add_data(
block_hashes_.rbegin(), block_hashes_.rend());
}
template <typename LoggerPolicy>
void block_manager_<LoggerPolicy>::validate_match(
const std::string& indent, const uint8_t* data, match_window& mw,
const std::vector<cyclic_hash_t>& hashvec, bm_stats& stats,
size_t block_size, size_t block_offset, size_t off, match_window& best,
size_t& best_offset) {
log_.trace() << indent << "potentially matched " << block_size
<< " bytes at offset " << off << ", hash=" << hashvec[off];
match_window win(off, off + block_size);
if (get_match_window(indent, win, block_offset, data, mw)) {
log_.trace() << indent << "definitely matched " << win.size()
<< " bytes at offset " << win.first;
++stats.real_matches;
// fuck yeah, we've got a block...
if (win.size() > best.size()) {
best = win;
best_offset = block_offset;
}
} else {
log_.trace() << indent << "bad match: " << block_size << " bytes at offset "
<< off << ", hash=" << hashvec[off];
++stats.bad_matches;
}
}
template <typename LoggerPolicy>
void block_manager_<LoggerPolicy>::segment_and_add_data(
const std::string& indent, const hash_map_type& hm,
@ -413,33 +448,10 @@ void block_manager_<LoggerPolicy>::segment_and_add_data(
match_window best;
size_t best_offset = 0;
auto bhi = bhcur->values.find(hashvec[off]);
if (bhi != bhcur->values.end()) {
log_.trace() << indent << "potentially matched " << bhcur->size
<< " bytes at offset " << off
<< ", hash=" << hashvec[off];
match_window win(off, off + bhcur->size);
size_t block_offset = bhi->second;
if (get_match_window(indent, win, block_offset, data, mw)) {
log_.trace() << indent << "definitely matched " << win.size()
<< " bytes at offset " << win.first;
++stats.real_matches;
// fuck yeah, we've got a block...
if (win.size() > best.size()) {
best = win;
best_offset = block_offset;
}
} else {
log_.trace() << indent << "bad match: " << bhcur->size
<< " bytes at offset " << off
<< ", hash=" << hashvec[off];
++stats.bad_matches;
}
if (auto bhi = bhcur->values.find(hashvec[off]);
bhi != bhcur->values.end()) {
validate_match(indent, data, mw, hashvec, stats, bhcur->size,
bhi->second, off, best, best_offset);
}
if (best.size() > 0) {