summaryrefslogtreecommitdiff
path: root/louloulibs/utils/encoding.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'louloulibs/utils/encoding.cpp')
-rw-r--r--louloulibs/utils/encoding.cpp253
1 files changed, 0 insertions, 253 deletions
diff --git a/louloulibs/utils/encoding.cpp b/louloulibs/utils/encoding.cpp
deleted file mode 100644
index 60f2212..0000000
--- a/louloulibs/utils/encoding.cpp
+++ /dev/null
@@ -1,253 +0,0 @@
-#include <utils/encoding.hpp>
-
-#include <utils/scopeguard.hpp>
-
-#include <stdexcept>
-
-#include <assert.h>
-#include <string.h>
-#include <iconv.h>
-
-#include <map>
-#include <bitset>
-
-/**
- * The UTF-8-encoded character used as a place holder when a character conversion fails.
- * This is U+FFFD � "replacement character"
- */
-static const char* invalid_char = "\xef\xbf\xbd";
-static const size_t invalid_char_len = 3;
-
-namespace utils
-{
- /**
- * Based on http://en.wikipedia.org/wiki/UTF-8#Description
- */
- std::size_t get_next_codepoint_size(const unsigned char c)
- {
- if ((c & 0b11111000) == 0b11110000) // 4 bytes: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- return 4;
- else if ((c & 0b11110000) == 0b11100000) // 3 bytes: 1110xxx 10xxxxxx 10xxxxxx
- return 3;
- else if ((c & 0b11100000) == 0b11000000) // 2 bytes: 110xxxxx 10xxxxxx
- return 2;
- return 1; // 1 byte: 0xxxxxxx
- }
-
- bool is_valid_utf8(const char* s)
- {
- if (!s)
- return false;
-
- const unsigned char* str = reinterpret_cast<const unsigned char*>(s);
-
- while (*str)
- {
- const auto codepoint_size = get_next_codepoint_size(str[0]);
- if (codepoint_size == 4)
- {
- if (!str[1] || !str[2] || !str[3]
- || ((str[1] & 0b11000000) != 0b10000000)
- || ((str[2] & 0b11000000) != 0b10000000)
- || ((str[3] & 0b11000000) != 0b10000000))
- return false;
- }
- else if (codepoint_size == 3)
- {
- if (!str[1] || !str[2]
- || ((str[1] & 0b11000000) != 0b10000000)
- || ((str[2] & 0b11000000) != 0b10000000))
- return false;
- }
- else if (codepoint_size == 2)
- {
- if (!str[1] ||
- ((str[1] & 0b11000000) != 0b10000000))
- return false;
- }
- else if ((str[0] & 0b10000000) != 0)
- return false;
- str += codepoint_size;
- }
- return true;
- }
-
- std::string remove_invalid_xml_chars(const std::string& original)
- {
- // The given string MUST be a valid utf-8 string
- std::vector<char> res(original.size(), '\0');
-
- // pointer where we write valid chars
- char* r = res.data();
-
- const char* str = original.c_str();
- std::bitset<20> codepoint;
-
- while (*str)
- {
- // 4 bytes: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- if ((str[0] & 0b11111000) == 0b11110000)
- {
- codepoint = ((str[0] & 0b00000111) << 18);
- codepoint |= ((str[1] & 0b00111111) << 12);
- codepoint |= ((str[2] & 0b00111111) << 6 );
- codepoint |= ((str[3] & 0b00111111) << 0 );
- if (codepoint.to_ulong() <= 0x10FFFF)
- {
- ::memcpy(r, str, 4);
- r += 4;
- }
- str += 4;
- }
- // 3 bytes: 1110xxx 10xxxxxx 10xxxxxx
- else if ((str[0] & 0b11110000) == 0b11100000)
- {
- codepoint = ((str[0] & 0b00001111) << 12);
- codepoint |= ((str[1] & 0b00111111) << 6);
- codepoint |= ((str[2] & 0b00111111) << 0 );
- if (codepoint.to_ulong() <= 0xD7FF ||
- (codepoint.to_ulong() >= 0xE000 && codepoint.to_ulong() <= 0xFFFD))
- {
- ::memcpy(r, str, 3);
- r += 3;
- }
- str += 3;
- }
- // 2 bytes: 110xxxxx 10xxxxxx
- else if (((str[0]) & 0b11100000) == 0b11000000)
- {
- // All 2 bytes char are valid, don't even bother calculating
- // the codepoint
- ::memcpy(r, str, 2);
- r += 2;
- str += 2;
- }
- // 1 byte: 0xxxxxxx
- else if ((str[0] & 0b10000000) == 0)
- {
- codepoint = ((str[0] & 0b01111111));
- if (codepoint.to_ulong() == 0x09 ||
- codepoint.to_ulong() == 0x0A ||
- codepoint.to_ulong() == 0x0D ||
- codepoint.to_ulong() >= 0x20)
- {
- ::memcpy(r, str, 1);
- r += 1;
- }
- str += 1;
- }
- else
- throw std::runtime_error("Invalid UTF-8 passed to remove_invalid_xml_chars");
- }
- return {res.data(), static_cast<size_t>(r - res.data())};
- }
-
- std::string convert_to_utf8(const std::string& str, const char* charset)
- {
- std::string res;
-
- const iconv_t cd = iconv_open("UTF-8", charset);
- if (cd == (iconv_t)-1)
- throw std::runtime_error("Cannot convert into UTF-8");
-
- // Make sure cd is always closed when we leave this function
- const auto sg = utils::make_scope_guard([&cd](auto&&){ iconv_close(cd); });
-
- size_t inbytesleft = str.size();
-
- // iconv will not attempt to modify this buffer, but some plateform
- // require a char** anyway
-#ifdef ICONV_SECOND_ARGUMENT_IS_CONST
- const char* inbuf_ptr = str.c_str();
-#else
- char* inbuf_ptr = const_cast<char*>(str.c_str());
-#endif
-
- size_t outbytesleft = str.size() * 4;
- char* outbuf = new char[outbytesleft];
- char* outbuf_ptr = outbuf;
-
- // Make sure outbuf is always deleted when we leave this function
- const auto sg2 = utils::make_scope_guard([outbuf](auto&&){ delete[] outbuf; });
-
- bool done = false;
- while (done == false)
- {
- size_t error = iconv(cd, &inbuf_ptr, &inbytesleft, &outbuf_ptr, &outbytesleft);
- if ((size_t)-1 == error)
- {
- switch (errno)
- {
- case EILSEQ:
- // Invalid byte found. Insert a placeholder instead of the
- // converted character, jump one byte and continue
- memcpy(outbuf_ptr, invalid_char, invalid_char_len);
- outbuf_ptr += invalid_char_len;
- inbytesleft--;
- inbuf_ptr++;
- break;
- case EINVAL:
- // A multibyte sequence is not terminated, but we can't
- // provide any more data, so we just add a placeholder to
- // indicate that the character is not properly converted,
- // and we stop the conversion
- memcpy(outbuf_ptr, invalid_char, invalid_char_len);
- outbuf_ptr += invalid_char_len;
- outbuf_ptr++;
- done = true;
- break;
- case E2BIG: // This should never happen
- default: // This should happen even neverer
- done = true;
- break;
- }
- }
- else
- {
- // The conversion finished without any error, stop converting
- done = true;
- }
- }
- // Terminate the converted buffer, and copy that buffer it into the
- // string we return
- *outbuf_ptr = '\0';
- res = outbuf;
- return res;
- }
-
-}
-
-namespace xep0106
-{
- static const std::map<const char, const std::string> encode_map = {
- {' ', "\\20"},
- {'"', "\\22"},
- {'&', "\\26"},
- {'\'',"\\27"},
- {'/', "\\2f"},
- {':', "\\3a"},
- {'<', "\\3c"},
- {'>', "\\3e"},
- {'@', "\\40"},
- };
-
- void decode(std::string& s)
- {
- std::string::size_type pos;
- for (const auto& pair: encode_map)
- while ((pos = s.find(pair.second)) != std::string::npos)
- s.replace(pos, pair.second.size(),
- 1, pair.first);
- }
-
- void encode(std::string& s)
- {
- std::string::size_type pos;
- while ((pos = s.find_first_of(" \"&'/:<>@")) != std::string::npos)
- {
- auto it = encode_map.find(s[pos]);
- assert(it != encode_map.end());
- s.replace(pos, 1, it->second);
- }
- }
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 22:18:37 +0000