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Updated to support Unicode normalization and simple charconverters that alter the low page

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This commit is contained in:
Nathan Woods 2017-01-01 12:08:40 -05:00
parent 2679c0f553
commit 34048b54f6
2 changed files with 57 additions and 20 deletions
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54
src/tools/imgtool/charconv.cpp
View file

@ -33,7 +33,7 @@ static const char32_t iso_8859_1_code_page[128] =
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
};
imgtool::simple_charconverter imgtool::charconverter_iso_8859_1(iso_8859_1_code_page);
imgtool::simple_charconverter imgtool::charconverter_iso_8859_1(nullptr, iso_8859_1_code_page);
//-------------------------------------------------
@ -42,28 +42,51 @@ imgtool::simple_charconverter imgtool::charconverter_iso_8859_1(iso_8859_1_code_
void imgtool::simple_charconverter::from_utf8(std::ostream &dest, const std::string &src) const
{
const util::contiguous_sequence_wrapper<const char32_t> lookup(m_highpage, 0x80);
// normalize the incoming unicode
std::string normalized_src = normalize_unicode(src, m_norm);
auto iter = src.begin();
while(iter != src.end())
auto iter = normalized_src.begin();
while(iter != normalized_src.end())
{
// get the next character
char32_t ch;
iter += uchar_from_utf8(&ch, &*iter, src.end() - iter);
iter += uchar_from_utf8(&ch, &*iter, normalized_src.end() - iter);
if (ch <= 0x7F)
// look in all pages
const char32_t *pages[2];
pages[0] = m_lowpage;
pages[1] = m_highpage;
bool found = false;
for (int i = 0; !found && i < ARRAY_LENGTH(pages); i++)
{
if (pages[i] == nullptr)
{
// null page; perhaps we can just emit this
if (ch >= i * 0x80 && (ch < (i + 1) * 0x80))
{
dest << (char)ch;
found = true;
}
}
else
{
// non-null page; perform a lookup
// if we have a page, perform the lookup
const util::contiguous_sequence_wrapper<const char32_t> lookup(pages[i], 0x80);
auto lookup_iter = std::find(lookup.begin(), lookup.end(), ch);
if (lookup_iter == lookup.end())
throw charconverter_exception();
dest << (char)(0x80 + (lookup_iter - lookup.begin()));
if (lookup_iter != lookup.end())
{
// and emit the result
dest << (char)((i * 0x80) + (lookup_iter - lookup.begin()));
found = true;
}
}
}
if (!found)
throw charconverter_exception();
}
}
//-------------------------------------------------
@ -74,15 +97,20 @@ void imgtool::simple_charconverter::to_utf8(std::ostream &dest, const std::strin
{
for (auto iter = src.begin(); iter != src.end(); iter++)
{
// which page is this in?
const char32_t *page = ((*iter & 0x80) == 0) ? m_lowpage : m_highpage;
// is this page present?
if ((*iter & 0x80) == 0)
{
// low page (0x00 - 0x7F) - pass it on
// no - pass it on
dest << *iter;
}
else
{
// high page (0x80 - 0xFF) - we need to do a lookup
char32_t ch = m_highpage[((unsigned char)(*iter)) - 0x80];
// yes - we need to do a lookup
size_t base = ((*iter & 0x80) == 0) ? 0x00 : 0x80;
char32_t ch = page[((unsigned char)(*iter)) - base];
if (ch == 0)
throw charconverter_exception();

13
src/tools/imgtool/charconv.h
View file

@ -12,6 +12,8 @@
#ifndef IMGTOOL_CHARCONV_H
#define IMGTOOL_CHARCONV_H
#include "unicode.h"
namespace imgtool
{
// ======================> charconverter
@ -47,8 +49,13 @@ namespace imgtool
class simple_charconverter : public charconverter
{
public:
constexpr simple_charconverter(const char32_t highpage[0x80])
: m_highpage(highpage)
constexpr simple_charconverter(const char32_t highpage[0x80], unicode_normalization_form norm = unicode_normalization_form::C)
: m_norm(norm), m_lowpage(nullptr), m_highpage(highpage)
{
}
constexpr simple_charconverter(const char32_t lowpage[0x80], const char32_t highpage[0x80], unicode_normalization_form norm = unicode_normalization_form::C)
: m_norm(norm), m_lowpage(lowpage), m_highpage(highpage)
{
}
@ -56,6 +63,8 @@ namespace imgtool
virtual void to_utf8(std::ostream &dest, const std::string &src) const override;
private:
unicode_normalization_form m_norm;
const char32_t *m_lowpage;
const char32_t *m_highpage;
};