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Added Brotli compress/decompress utilities and makefiles

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This commit is contained in:
Roderick Sheeter
2013-11-19 14:32:56 -08:00
parent 1571db36a9
commit 437bbad370
29 changed files with 3267 additions and 135 deletions
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brotli/enc/backward_references.cc
+8 -3
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@@ -47,27 +47,30 @@ void CreateBackwardReferences(size_t num_bytes,
while (i + 2 < i_end) {
size_t best_len = 0;
size_t best_len_code = 0;
size_t best_dist = 0;
double best_score = 0;
const size_t max_distance = std::min(i + i_diff, max_backward_limit);
size_t max_distance = std::min(i + i_diff, max_backward_limit);
hasher->set_insert_length(insert_length);
bool match_found = hasher->FindLongestMatch(
ringbuffer, literal_cost, ringbuffer_mask,
i + i_diff, i_end - i, max_distance,
&best_len, &best_dist, &best_score);
&best_len, &best_len_code, &best_dist, &best_score);
if (match_found) {
// Found a match. Let's look for something even better ahead.
int delayed_backward_references_in_row = 0;
while (i + 4 < i_end &&
delayed_backward_references_in_row < 4) {
size_t best_len_2 = 0;
size_t best_len_code_2 = 0;
size_t best_dist_2 = 0;
double best_score_2 = 0;
max_distance = std::min(i + i_diff + 1, max_backward_limit);
hasher->Store(ringbuffer + i, i + i_diff);
match_found = hasher->FindLongestMatch(
ringbuffer, literal_cost, ringbuffer_mask,
i + i_diff + 1, i_end - i - 1, max_distance,
&best_len_2, &best_dist_2, &best_score_2);
&best_len_2, &best_len_code_2, &best_dist_2, &best_score_2);
double cost_diff_lazy = 0;
if (best_len >= 4) {
cost_diff_lazy +=
@@ -96,6 +99,7 @@ void CreateBackwardReferences(size_t num_bytes,
++insert_length;
++delayed_backward_references_in_row;
best_len = best_len_2;
best_len_code = best_len_code_2;
best_dist = best_dist_2;
best_score = best_score_2;
i++;
@@ -106,6 +110,7 @@ void CreateBackwardReferences(size_t num_bytes,
Command cmd;
cmd.insert_length_ = insert_length;
cmd.copy_length_ = best_len;
cmd.copy_length_code_ = best_len_code;
cmd.copy_distance_ = best_dist;
commands->push_back(cmd);
hasher->set_last_distance(best_dist);