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epee: some more minor JSON parsing speedup

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moneromooo-monero 2018-12-27 19:15:05 +00:00
parent e4b049da05
commit 59776a64ff
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4 changed files with 11 additions and 8 deletions
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7
contrib/epee/include/storages/parserse_base_utils.h
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@ -42,13 +42,14 @@ namespace misc_utils
// 4: alpha
// 8: whitespace
// 16: allowed in float but doesn't necessarily mean it's a float
// 32: \ and " (end of verbatim string)
static const constexpr uint8_t lut[256]={
0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 0, 0, // 16
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 32
8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 16, 18, 0, // 48
8, 0, 32, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 16, 18, 0, // 48
17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 0, 0, 0, 0, 0, 0, // 64
0, 4, 4, 4, 4, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 80
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, // 96
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 32, 0, 0, 0, // 96
0, 4, 4, 4, 4, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, // 112
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, // 128
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@ -130,7 +131,7 @@ namespace misc_utils
std::string::const_iterator it = star_end_string;
++it;
std::string::const_iterator fi = it;
while (fi != buf_end && *fi != '\\' && *fi != '\"')
while (fi != buf_end && ((lut[(uint8_t)*fi] & 32)) == 0)
++fi;
val.assign(it, fi);
val.reserve(std::distance(star_end_string, buf_end));