inline const char* fast_atoreal_move(const char* c, Real& out)
{
Real f;
bool inv = (*c == '-');
if (inv || *c == '+') {
++c;
}
f = static_cast<Real>(strtoul10_64(c, &c));
if (*c == '.' || (c[0] == ',' && c[1] >= '0' && c[1] <= '9')) // allow for commas, too
{
++c;
// NOTE: The original implementation is highly inaccurate here. The precision of a single
// IEEE 754 float is not high enough, everything behind the 6th digit tends to be more
// inaccurate than it would need to be. Casting to double seems to solve the problem.
// strtol_64 is used to prevent integer overflow.
// Another fix: this tends to become 0 for long numbers if we don't limit the maximum
// number of digits to be read. FAST_ATOF_RELAVANT_DECIMALS can be a value between
// 1 and 15.
unsigned int diff = FAST_ATOF_RELAVANT_DECIMALS;
double pl = static_cast<double>(strtoul10_64(c, &c, &diff));
pl *= fast_atof_table[diff];
f += static_cast<Real>(pl);
}
// A major 'E' must be allowed. Necessary for proper reading of some DXF files.
// Thanks to Zhao Lei to point out that this if() must be outside the if (*c == '.' ..)
if (*c == 'e' || *c == 'E') {
++c;
const bool einv = (*c == '-');
if (einv || *c == '+') {
++c;
}
// The reason float constants are used here is that we've seen cases where compilers
// would perform such casts on compile-time constants at runtime, which would be
// bad considering how frequently fast_atoreal_move<float> is called in Assimp.
Real exp = static_cast<Real>(strtoul10_64(c, &c));
if (einv) {
exp = -exp;
}
f *= pow(static_cast<Real>(10.0f), exp);
}
if (inv) {
f = -f;
}
out = f;
return c;
}
// ------------------------------------------------------------------------------------------------
uint64_t ParseTokenAsID(const Token& t, const char*& err_out)
{
err_out = NULL;
if (t.Type() != TokenType_DATA) {
err_out = "expected TOK_DATA token";
return 0L;
}
if(t.IsBinary())
{
const char* data = t.begin();
if (data[0] != 'L') {
err_out = "failed to parse ID, unexpected data type, expected L(ong) (binary)";
return 0L;
}
BE_NCONST uint64_t id = SafeParse<uint64_t>(data+1, t.end());
AI_SWAP8(id);
return id;
}
// XXX: should use size_t here
unsigned int length = static_cast<unsigned int>(t.end() - t.begin());
ai_assert(length > 0);
const char* out;
const uint64_t id = strtoul10_64(t.begin(),&out,&length);
if (out > t.end()) {
err_out = "failed to parse ID (text)";
return 0L;
}
return id;
}
// ------------------------------------------------------------------------------------------------
size_t ParseTokenAsDim(const Token& t, const char*& err_out)
{
// same as ID parsing, except there is a trailing asterisk
err_out = NULL;
if (t.Type() != TokenType_DATA) {
err_out = "expected TOK_DATA token";
return 0;
}
if(t.IsBinary())
{
const char* data = t.begin();
if (data[0] != 'L') {
err_out = "failed to parse ID, unexpected data type, expected L(ong) (binary)";
return 0;
}
BE_NCONST uint64_t id = SafeParse<uint64_t>(data+1, t.end());
AI_SWAP8(id);
return static_cast<size_t>(id);
}
if(*t.begin() != '*') {
err_out = "expected asterisk before array dimension";
return 0;
}
// XXX: should use size_t here
unsigned int length = static_cast<unsigned int>(t.end() - t.begin());
if(length == 0) {
err_out = "expected valid integer number after asterisk";
return 0;
}
const char* out;
const size_t id = static_cast<size_t>(strtoul10_64(t.begin() + 1,&out,&length));
if (out > t.end()) {
err_out = "failed to parse ID";
return 0;
}
return id;
}
