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Refactored internal functions in core.h

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git-svn-id: http://svn.code.sf.net/p/utfcpp/code@124 a809a056-fc17-0410-9590-b4f493f8b08e
This commit is contained in:
ntrifunovic 2011-10-15 22:54:58 +00:00
parent 36839ac4e7
commit 26d8c8e424
1 changed files with 70 additions and 89 deletions
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123
v2_0/source/utf8/core.h
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@ -133,120 +133,101 @@ namespace internal
enum utf_error {UTF8_OK, NOT_ENOUGH_ROOM, INVALID_LEAD, INCOMPLETE_SEQUENCE, OVERLONG_SEQUENCE, INVALID_CODE_POINT};
/// get_sequence_x functions decode utf-8 sequences of the length x
/// Helper for get_sequence_x
template <typename octet_iterator>
utf_error increase_safely(octet_iterator& it, octet_iterator end)
{
if (++it == end)
return NOT_ENOUGH_ROOM;
if (!utf8::internal::is_trail(*it))
return INCOMPLETE_SEQUENCE;
return UTF8_OK;
}
#define UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(IT, END) {utf_error ret = increase_safely(IT, END); if (ret != UTF8_OK) return ret;}
/// get_sequence_x functions decode utf-8 sequences of the length x
template <typename octet_iterator>
utf_error get_sequence_1(octet_iterator& it, octet_iterator end, uint32_t* code_point)
{
if (it != end) {
if (it == end)
return NOT_ENOUGH_ROOM;
if (code_point)
*code_point = utf8::internal::mask8(*it);
return UTF8_OK;
}
return NOT_ENOUGH_ROOM;
}
template <typename octet_iterator>
utf_error get_sequence_2(octet_iterator& it, octet_iterator end, uint32_t* code_point)
{
utf_error ret_code = NOT_ENOUGH_ROOM;
if (it == end)
return NOT_ENOUGH_ROOM;
if (it != end) {
uint32_t cp = utf8::internal::mask8(*it);
if (++it != end) {
if (utf8::internal::is_trail(*it)) {
UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
if (code_point)
*code_point = cp;
ret_code = UTF8_OK;
}
else
ret_code = INCOMPLETE_SEQUENCE;
}
else
ret_code = NOT_ENOUGH_ROOM;
}
return ret_code;
return UTF8_OK;
}
template <typename octet_iterator>
utf_error get_sequence_3(octet_iterator& it, octet_iterator end, uint32_t* code_point)
{
utf_error ret_code = NOT_ENOUGH_ROOM;
if (it == end)
return NOT_ENOUGH_ROOM;
if (it != end) {
uint32_t cp = utf8::internal::mask8(*it);
if (++it != end) {
if (utf8::internal::is_trail(*it)) {
UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
cp = ((cp << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
if (++it != end) {
if (utf8::internal::is_trail(*it)) {
UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
cp += (*it) & 0x3f;
if (code_point)
*code_point = cp;
ret_code = UTF8_OK;
}
else
ret_code = INCOMPLETE_SEQUENCE;
}
else
ret_code = NOT_ENOUGH_ROOM;
}
else
ret_code = INCOMPLETE_SEQUENCE;
}
else
ret_code = NOT_ENOUGH_ROOM;
}
return ret_code;
return UTF8_OK;
}
template <typename octet_iterator>
utf_error get_sequence_4(octet_iterator& it, octet_iterator end, uint32_t* code_point)
{
utf_error ret_code = NOT_ENOUGH_ROOM;
if (it == end)
return NOT_ENOUGH_ROOM;
if (it != end) {
uint32_t cp = utf8::internal::mask8(*it);
if (++it != end) {
if (utf8::internal::is_trail(*it)) {
UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
if (++it != end) {
if (utf8::internal::is_trail(*it)) {
UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
cp += (utf8::internal::mask8(*it) << 6) & 0xfff;
if (++it != end) {
if (utf8::internal::is_trail(*it)) {
UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
cp += (*it) & 0x3f;
if (code_point)
*code_point = cp;
ret_code = UTF8_OK;
}
else
ret_code = INCOMPLETE_SEQUENCE;
}
else
ret_code = NOT_ENOUGH_ROOM;
}
else
ret_code = INCOMPLETE_SEQUENCE;
}
else
ret_code = NOT_ENOUGH_ROOM;
}
else
ret_code = INCOMPLETE_SEQUENCE;
}
else
ret_code = NOT_ENOUGH_ROOM;
return UTF8_OK;
}
return ret_code;
}
#undef UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR
template <typename octet_iterator>
utf_error validate_next(octet_iterator& it, octet_iterator end, uint32_t* code_point)
@ -258,13 +239,13 @@ namespace internal
uint32_t cp = 0;
// Determine the sequence length based on the lead octet
typedef typename std::iterator_traits<octet_iterator>::difference_type octet_difference_type;
octet_difference_type length = utf8::internal::sequence_length(it);
if (length == 0)
return INVALID_LEAD;
const octet_difference_type length = utf8::internal::sequence_length(it);
// Now that we have a valid sequence length, get trail octets and calculate the code point
// Get trail octets and calculate the code point
utf_error err = UTF8_OK;
switch (length) {
case 0:
return INVALID_LEAD;
case 1:
err = utf8::internal::get_sequence_1(it, end, &cp);
break;