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authorMatthias P. Braendli <matthias.braendli@mpb.li>2018-02-09 12:02:13 +0100
committerMatthias P. Braendli <matthias.braendli@mpb.li>2018-02-09 12:02:13 +0100
commit4897c53db48386fbbd2556e8be6d5a60e9d1a7ba (patch)
tree30acae2ffeb12fbf189eec72709edc4ffab6a83a /lib/charset/charset.cpp
parent2a96b61d31cc51611731297f936a477663871b9d (diff)
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Move charset implementation to cpp file
Diffstat (limited to 'lib/charset/charset.cpp')
-rw-r--r--lib/charset/charset.cpp62
1 files changed, 57 insertions, 5 deletions
diff --git a/lib/charset/charset.cpp b/lib/charset/charset.cpp
index 5cc773d..1abc097 100644
--- a/lib/charset/charset.cpp
+++ b/lib/charset/charset.cpp
@@ -1,5 +1,5 @@
/*
- Copyright (C) 2015 Matthias P. Braendli (http://opendigitalradio.org)
+ Copyright (C) 2018 Matthias P. Braendli (http://opendigitalradio.org)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -16,13 +16,15 @@
*/
/*!
\file charset.cpp
- \brief Define the EBU charset according to ETSI TS 101 756v1.8.1 for DLS encoding
+ \brief A converter for UTF-8 to EBU Latin charset according to
+ ETSI TS 101 756 Annex C, used for DLS and Labels.
- \author Matthias P. Braendli <matthias@mpb.li>
+ \author Matthias P. Braendli
\author Lindsay Cornell
*/
#include "charset.h"
+#include <algorithm>
/**********************************************/
/************* BIG FAT WARNING ****************/
@@ -34,8 +36,10 @@
/********* END OF BIG FAT WARNING *************/
/**********************************************/
+#define CHARSET_TABLE_OFFSET 1 // NUL at index 0 cannot be represented
+#define CHARSET_TABLE_ENTRIES (256 - CHARSET_TABLE_OFFSET)
-const char* utf8_encoded_EBU_Latin[CHARSET_TABLE_ENTRIES] = {
+static const char* utf8_encoded_EBU_Latin[CHARSET_TABLE_ENTRIES] = {
"Ę", "Į", "Ų", "Ă", "Ė", "Ď", "Ș", "Ț", "Ċ", "\n","\v","Ġ", "Ĺ", "Ż", "Ń",
"ą", "ę", "į", "ų", "ă", "ė", "ď", "ș", "ț", "ċ", "Ň", "Ě", "ġ", "ĺ", "ż", "\u0082",
" ", "!", "\"","#", "ł", "%", "&", "'", "(", ")", "*", "+", ",", "-", ".", "/",
@@ -53,10 +57,58 @@ const char* utf8_encoded_EBU_Latin[CHARSET_TABLE_ENTRIES] = {
"Ã", "Å", "Æ", "Œ", "ŷ", "Ý", "Õ", "Ø", "Þ", "Ŋ", "Ŕ", "Ć", "Ś", "Ź", "Ť", "ð",
"ã", "å", "æ", "œ", "ŵ", "ý", "õ", "ø", "þ", "ŋ", "ŕ", "ć", "ś", "ź", "ť", "ħ"};
-std::string CharsetConverter::convert_ebu_to_utf8(const std::string& str)
+using namespace std;
+
+CharsetConverter::CharsetConverter()
{
+ /*! Build the converstion table that contains the known code points,
+ * at the indices corresponding to the EBU Latin table
+ */
using namespace std;
+ for (size_t i = 0; i < CHARSET_TABLE_ENTRIES; i++) {
+ string table_entry(utf8_encoded_EBU_Latin[i]);
+ string::iterator it = table_entry.begin();
+ uint32_t code_point = utf8::next(it, table_entry.end());
+ m_conversion_table.push_back(code_point);
+ }
+}
+
+std::string CharsetConverter::convert(std::string line_utf8, bool up_to_first_error)
+{
+ string::iterator end_it;
+
+ if (up_to_first_error) {
+ // check for invalid utf-8, we only convert up to the first error
+ end_it = utf8::find_invalid(line_utf8.begin(), line_utf8.end());
+ }
+ else {
+ end_it = line_utf8.end();
+ }
+
+ // Convert it to utf-32
+ vector<uint32_t> utf32line;
+ utf8::utf8to32(line_utf8.begin(), end_it, back_inserter(utf32line));
+ string encoded_line(utf32line.size(), '0');
+
+ // Try to convert each codepoint
+ for (size_t i = 0; i < utf32line.size(); i++) {
+ vector<uint32_t>::iterator iter = find(m_conversion_table.begin(),
+ m_conversion_table.end(), utf32line[i]);
+ if (iter != m_conversion_table.end()) {
+ size_t index = std::distance(m_conversion_table.begin(), iter);
+
+ encoded_line[i] = (char)(index + CHARSET_TABLE_OFFSET);
+ }
+ else {
+ encoded_line[i] = ' ';
+ }
+ }
+ return encoded_line;
+}
+
+std::string CharsetConverter::convert_ebu_to_utf8(const std::string& str)
+{
string utf8_str;
for (const uint8_t c : str) {
// Table offset because NUL is not represented