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#include "utf32.hh"
#include "utf_error.hh"
namespace utf {
namespace {
inline bool valid_codepoint(uint32_t c) {
return (c < 0xd800) || (c > 0xdfff && c <= 0x10ffff);
}
} // namespace
uint32_t read32be(std::string_view data, std::size_t& offset) {
if (offset > data.size() || data.size() - offset < 4)
return NEED_MORE;
uint32_t c = static_cast<uint32_t>(data[offset]) << 24
| static_cast<uint32_t>(data[offset + 1] & 0xff) << 16
| static_cast<uint32_t>(data[offset + 2] & 0xff) << 8
| static_cast<uint32_t>(data[offset + 3] & 0xff);
if (valid_codepoint(c)) {
offset += 4;
return c;
}
return INVALID;
}
uint32_t read32le(std::string_view data, std::size_t& offset) {
if (offset > data.size() || data.size() - offset < 4)
return NEED_MORE;
uint32_t c = static_cast<uint32_t>(data[offset + 3]) << 24
| static_cast<uint32_t>(data[offset + 2] & 0xff) << 16
| static_cast<uint32_t>(data[offset + 1] & 0xff) << 8
| static_cast<uint32_t>(data[offset] & 0xff);
if (valid_codepoint(c)) {
offset += 4;
return c;
}
return INVALID;
}
} // namespace utf
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