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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "utf8.h"
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/util/exceptions.h>
#include <cassert>
#include <vespa/log/log.h>
LOG_SETUP(".vespalib.utf8");
namespace vespalib {
void Utf8::throwX(const char *msg, unsigned int number)
{
vespalib::string what = make_string("%s: \\x%02X", msg, number);
throw IllegalArgumentException(what);
}
uint32_t Utf8Reader::getComplexChar(unsigned char firstbyte, uint32_t fallback) noexcept
{
if (_pos == size()) {
// this shouldn't happen ...
LOG(warning, "last byte %02X of Utf8Reader block was incomplete UTF-8", firstbyte);
return fallback;
}
assert(hasMore()); // should never fall out of range
if (! Utf8::validFirstByte(firstbyte)) {
LOG(debug, "invalid first byte %02X in Utf8Reader data block", firstbyte);
return fallback;
}
int need = Utf8::numContBytes(firstbyte);
if (_pos + need > size()) {
LOG(debug, "incomplete data (first byte %02X, pos=%zu, need=%d, size=%zu) in Utf8Reader data block",
firstbyte, _pos, need, size());
return fallback;
}
if (need == 1) {
unsigned char contbyte = (*this)[_pos];
if (Utf8::validContByte(contbyte)) {
++_pos;
uint32_t r = decode2(firstbyte, contbyte);
// check > 0x7F ?
return r;
} else {
LOG(debug, "invalid continuation byte %02X in Utf8Reader data block", contbyte);
return fallback;
}
}
if (need == 2) {
unsigned char contbyte1 = (*this)[_pos];
unsigned char contbyte2 = (*this)[_pos+1];
if (Utf8::validContByte(contbyte1) &&
Utf8::validContByte(contbyte2))
{
_pos += 2;
uint32_t r = decode3(firstbyte, contbyte1, contbyte2);
if (r >= first_high_surrogate && r <= last_low_surrogate) {
// surrogates not valid in utf8
return fallback;
}
// check > 0x7FF ?
return r;
} else {
LOG(debug, "invalid continuation bytes %02X/%02X in Utf8Reader data block", contbyte1, contbyte2);
return fallback;
}
}
unsigned char contbyte1 = (*this)[_pos];
unsigned char contbyte2 = (*this)[_pos+1];
unsigned char contbyte3 = (*this)[_pos+2];
if (Utf8::validContByte(contbyte1) &&
Utf8::validContByte(contbyte2) &&
Utf8::validContByte(contbyte3))
{
_pos += 3;
// check > 0xFFFF?
return decode4(firstbyte, contbyte1, contbyte2, contbyte3);
} else {
LOG(debug, "invalid continuation bytes %02X/%02X/%02X in Utf8Reader data block",
contbyte1, contbyte2, contbyte3);
return fallback;
}
}
uint32_t
Utf8ReaderForZTS::getComplexChar(unsigned char firstbyte, uint32_t fallback) noexcept
{
if (! Utf8::validFirstByte(firstbyte)) {
LOG(debug, "invalid first byte %02X in Utf8Reader data block", firstbyte);
return fallback;
}
int need = Utf8::numContBytes(firstbyte);
if (need == 1) {
if (_p[0] == 0) {
LOG(debug, "incomplete character (first byte %02X) in Utf8ReaderZTS", firstbyte);
return fallback;
}
unsigned char contbyte = _p[0];
if (Utf8::validContByte(contbyte)) {
_p += 1;
uint32_t r = decode2(firstbyte, contbyte);
// check > 0x7F ?
return r;
} else {
LOG(debug, "invalid continuation byte %02X in Utf8Reader data block", contbyte);
return fallback;
}
}
if (need == 2) {
if (_p[0] == 0 || _p[1] == 0) {
LOG(debug, "incomplete character (first byte %02X) in Utf8ReaderZTS", firstbyte);
return fallback;
}
unsigned char contbyte1 = _p[0];
unsigned char contbyte2 = _p[1];
if (Utf8::validContByte(contbyte1) &&
Utf8::validContByte(contbyte2))
{
_p += 2;
uint32_t r = decode3(firstbyte, contbyte1, contbyte2);
if (r >= first_high_surrogate && r <= last_low_surrogate) {
// surrogates not valid in utf8
return fallback;
}
// check > 0x7FF ?
return r;
} else {
LOG(debug, "invalid continuation bytes %02X/%02X in Utf8Reader data block", contbyte1, contbyte2);
return fallback;
}
}
if (_p[0] == 0 || _p[1] == 0 || _p[2] == 0) {
LOG(debug, "incomplete character (first byte %02X) in Utf8ReaderZTS", firstbyte);
return fallback;
}
unsigned char contbyte1 = _p[0];
unsigned char contbyte2 = _p[1];
unsigned char contbyte3 = _p[2];
if (Utf8::validContByte(contbyte1) &&
Utf8::validContByte(contbyte2) &&
Utf8::validContByte(contbyte3))
{
_p += 3;
// check > 0xFFFF?
return decode4(firstbyte, contbyte1, contbyte2, contbyte3);
} else {
LOG(debug, "invalid continuation bytes %02X/%02X/%02X in Utf8Reader data block", contbyte1, contbyte2, contbyte3);
return fallback;
}
}
template <typename Target>
Utf8Writer<Target>&
Utf8Writer<Target>::putChar(uint32_t codepoint)
{
if (codepoint < 0x80) {
_target.push_back((char)codepoint);
} else if (codepoint < 0x800) {
char low6 = (codepoint & low_6bits_mask);
low6 |= 0x80;
codepoint >>= 6;
char first5 = codepoint;
first5 |= 0xC0;
_target.push_back(first5);
_target.push_back(low6);
} else if (codepoint < 0x10000) {
char low6 = (codepoint & low_6bits_mask);
low6 |= 0x80;
codepoint >>= 6;
char mid6 = (codepoint & low_6bits_mask);
mid6 |= 0x80;
codepoint >>= 6;
char first4 = codepoint;
first4 |= 0xE0;
_target.push_back(first4);
_target.push_back(mid6);
_target.push_back(low6);
} else if (codepoint < 0x110000) {
char low6 = (codepoint & low_6bits_mask);
low6 |= 0x80;
codepoint >>= 6;
char mid6 = (codepoint & low_6bits_mask);
mid6 |= 0x80;
codepoint >>= 6;
char hi6 = (codepoint & low_6bits_mask);
hi6 |= 0x80;
codepoint >>= 6;
char first3 = codepoint;
first3 |= 0xF0;
_target.push_back(first3);
_target.push_back(hi6);
_target.push_back(mid6);
_target.push_back(low6);
} else {
Utf8::throwX("invalid ucs4 codepoint", codepoint);
}
return *this;
}
template class Utf8Writer<vespalib::string>;
template class Utf8Writer<std::string>;
template <typename T>
T Utf8::filter_invalid_sequences(const T& input) noexcept
{
T retval;
Utf8Reader reader(input.c_str(), input.size());
Utf8Writer writer(retval);
while (reader.hasMore()) {
uint32_t ch = reader.getChar();
writer.putChar(ch);
}
return retval;
}
template vespalib::string Utf8::filter_invalid_sequences(const vespalib::string&);
template std::string Utf8::filter_invalid_sequences(const std::string&);
} // namespace
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