mirror of
https://github.com/openharmony/third_party_meshoptimizer.git
synced 2026-07-21 08:05:22 -04:00
Arseny Kapoulkine
0ad6ab3da0
inf/nan are not valid in JSON syntax; while ideally we would not produce these values in the first place, it would make sense to have a last-resort check that outputs valid JSON regardless of the values. For +-inf we clamp them to max float, preserving the sign; for NaNs we choose to output max float for now since that value is still valid in JSON but looks sufficiently weird that it's obvious something happened during processing.
81 lines
1.5 KiB
C++
81 lines
1.5 KiB
C++
// This file is part of gltfpack; see gltfpack.h for version/license details
|
|
#include "gltfpack.h"
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <stdio.h>
|
|
|
|
void comma(std::string& s)
|
|
{
|
|
char ch = s.empty() ? 0 : s[s.size() - 1];
|
|
|
|
if (ch != 0 && ch != '[' && ch != '{')
|
|
s += ",";
|
|
}
|
|
|
|
void append(std::string& s, size_t v)
|
|
{
|
|
char buf[32];
|
|
snprintf(buf, sizeof(buf), "%zu", v);
|
|
s += buf;
|
|
}
|
|
|
|
void append(std::string& s, float v)
|
|
{
|
|
// sanitize +-inf to +-FLT_MAX and NaN to FLT_MAX
|
|
// it would be more consistent to use null for NaN but that makes JSON invalid, and 0 makes it hard to distinguish from valid values
|
|
float sv = fabsf(v) < FLT_MAX ? v : (v < 0 ? -FLT_MAX : FLT_MAX);
|
|
|
|
char buf[64];
|
|
snprintf(buf, sizeof(buf), "%.9g", sv);
|
|
s += buf;
|
|
}
|
|
|
|
void append(std::string& s, const char* v)
|
|
{
|
|
s += v;
|
|
}
|
|
|
|
void append(std::string& s, const std::string& v)
|
|
{
|
|
s += v;
|
|
}
|
|
|
|
void appendJson(std::string& s, const char* data)
|
|
{
|
|
enum State
|
|
{
|
|
None,
|
|
Escape,
|
|
Quoted
|
|
} state = None;
|
|
|
|
for (const char* it = data; *it; ++it)
|
|
{
|
|
char ch = *it;
|
|
|
|
// whitespace outside of quoted strings can be ignored
|
|
if (state != None || !isspace(ch))
|
|
s += ch;
|
|
|
|
// the finite automata tracks whether we're inside a quoted string
|
|
switch (state)
|
|
{
|
|
case None:
|
|
state = (ch == '"') ? Quoted : None;
|
|
break;
|
|
|
|
case Quoted:
|
|
state = (ch == '"') ? None : (ch == '\\' ? Escape : Quoted);
|
|
break;
|
|
|
|
case Escape:
|
|
state = Quoted;
|
|
break;
|
|
|
|
default:
|
|
assert(!"Unexpected parsing state");
|
|
}
|
|
}
|
|
}
|