size_t
UUID::SetfromCString (const char *cstr)
{
if (cstr == NULL)
return 0;
uint32_t uuid_byte_idx = 0;
const char *p = cstr;
// Skip leading whitespace characters
while (isspace(*p))
++p;
// Try and decode a UUID
while (*p != '\0')
{
if (isxdigit(*p) && isxdigit(p[1]))
{
int hi_nibble = xdigit_to_int(p[0]);
int lo_nibble = xdigit_to_int(p[1]);
// Translate the two hex nibble characters into a byte
m_uuid[uuid_byte_idx] = (hi_nibble << 4) + lo_nibble;
// Skip both hex digits
p += 2;
// Increment the byte that we are decoding within the UUID value
// and break out if we are done
if (++uuid_byte_idx == 16)
break;
}
else if (*p == '-')
{
// Skip dashes
p++;
}
else
{
// UUID values can only consist of hex characters and '-' chars
return 0;
}
}
// If we successfully decoded a UUID, return the amount of characters that
// were consumed
if (uuid_byte_idx == 16)
return p - cstr;
// Else return zero to indicate we were not able to parse a UUID value
return 0;
}
size_t
UUID::DecodeUUIDBytesFromCString (const char *p, ValueType &uuid_bytes, const char **end, uint32_t num_uuid_bytes)
{
size_t uuid_byte_idx = 0;
if (p)
{
while (*p)
{
if (isxdigit(p[0]) && isxdigit(p[1]))
{
int hi_nibble = xdigit_to_int(p[0]);
int lo_nibble = xdigit_to_int(p[1]);
// Translate the two hex nibble characters into a byte
uuid_bytes[uuid_byte_idx] = (hi_nibble << 4) + lo_nibble;
// Skip both hex digits
p += 2;
// Increment the byte that we are decoding within the UUID value
// and break out if we are done
if (++uuid_byte_idx == num_uuid_bytes)
break;
}
else if (*p == '-')
{
// Skip dashes
p++;
}
else
{
// UUID values can only consist of hex characters and '-' chars
break;
}
}
}
if (end)
*end = p;
// Clear trailing bytes to 0.
for (uint32_t i = uuid_byte_idx; i < sizeof(ValueType); i++)
uuid_bytes[i] = 0;
return uuid_byte_idx;
}
bool parser::parse_string(context& ctx, string_type& value, IteratorType& ch, IteratorType end)
{
ctx.clear();
if (!check_char(ctx, '"', ch, end))
{
return false;
}
while (ch != end)
{
if (std::iscntrl(*ch))
{
return false;
}
switch (*ch)
{
case '"':
{
// The string ends.
++ch;
value = ctx.str();
return true;
}
case '\\':
{
// An escape character was provided.
++ch;
if (ch == end)
{
return false;
}
switch (*ch)
{
case '"':
ctx.push_char('"');
++ch;
break;
case '\\':
ctx.push_char('\\');
++ch;
break;
case '/':
ctx.push_char('/');
++ch;
break;
case 'b':
ctx.push_char('\b');
++ch;
break;
case 'n':
ctx.push_char('\n');
++ch;
break;
case 'f':
ctx.push_char('\f');
++ch;
break;
case 'r':
ctx.push_char('\r');
++ch;
break;
case 't':
ctx.push_char('\t');
++ch;
break;
case 'u':
{
++ch;
uint16_t codepoint = 0x0000;
for (size_t i = 0; i < 4; ++i)
{
if (ch == end)
{
return false;
}
if (!std::isxdigit(*ch))
{
return false;
}
codepoint *= 16;
codepoint += xdigit_to_int(*ch);
++ch;
}
ctx.push_codepoint(codepoint);
break;
}
default:
return false;
}
break;
}
default:
{
ctx.push_char(*ch);
++ch;
}
}
}
return false;
}