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Optimize zero_encode.

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This commit is contained in:
levlam 2023-07-26 14:58:08 +03:00
parent 38fe2d7cb2
commit c50afa3820
1 changed files with 11 additions and 5 deletions
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16
tdutils/td/utils/misc.cpp
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@ -7,6 +7,8 @@
#include "td/utils/misc.h" #include "td/utils/misc.h"
#include "td/utils/port/thread_local.h" #include "td/utils/port/thread_local.h"
#include "td/utils/StackAllocator.h"
#include "td/utils/StringBuilder.h"
#include "td/utils/utf8.h" #include "td/utils/utf8.h"
#include <algorithm> #include <algorithm>
@ -205,21 +207,25 @@ namespace {
template <class F> template <class F>
string x_decode(Slice s, F &&f) { string x_decode(Slice s, F &&f) {
string res; auto buffer = StackAllocator::alloc(1024);
auto res = StringBuilder(buffer.as_slice(), true);
for (size_t n = s.size(), i = 0; i < n; i++) { for (size_t n = s.size(), i = 0; i < n; i++) {
if (i + 1 < n && f(s[i])) { if (i + 1 < n && f(s[i])) {
res.append(static_cast<unsigned char>(s[i + 1]), s[i]); for (int cnt = static_cast<unsigned char>(s[i + 1]); cnt > 0; cnt--) {
res.push_back(s[i]);
}
i++; i++;
continue; continue;
} }
res.push_back(s[i]); res.push_back(s[i]);
} }
return res; return res.as_cslice().str();
} }
template <class F> template <class F>
string x_encode(Slice s, F &&f) { string x_encode(Slice s, F &&f) {
string res; auto buffer = StackAllocator::alloc(1024);
auto res = StringBuilder(buffer.as_slice(), true);
for (size_t n = s.size(), i = 0; i < n; i++) { for (size_t n = s.size(), i = 0; i < n; i++) {
res.push_back(s[i]); res.push_back(s[i]);
if (f(s[i])) { if (f(s[i])) {
@ -231,7 +237,7 @@ string x_encode(Slice s, F &&f) {
i += cnt - 1; i += cnt - 1;
} }
} }
return res; return res.as_cslice().str();
} }
bool is_zero(unsigned char c) { bool is_zero(unsigned char c) {