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https://github.com/reactos/reactos.git
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2ea03b5b22
Fixing typos in code comments enhances code readability and comprehension for developers and collaborators.
316 lines
8.8 KiB
C++
316 lines
8.8 KiB
C++
/*
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* Usage: utf16le inputfile outputfile
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*
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* This is a tool and is compiled using the host compiler,
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* i.e. on Linux gcc and not mingw-gcc (cross-compiler).
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* It's a converter from utf-8, utf-16 (LE/BE) and utf-32 (LE/BE)
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* to utf-16 LE and especially made for automatic conversions of
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* INF-files from utf-8 to utf-16LE (so we can furthermore
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* store the INF files in utf-8 for subversion.
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*
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* Author: Matthias Kupfer (mkupfer@reactos.org)
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*/
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#include <fstream>
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#include <iostream>
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#include <string.h>
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//#define DISPLAY_DETECTED_UNICODE
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using namespace std;
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#ifdef _MSC_VER
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#define strcasecmp _stricmp
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#endif
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class utf_converter
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{
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public:
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// detect can detect utf-8 and both utf-16 variants, but assume utf-32 only
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// due to ambiguous BOM
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enum enc_types { detect, utf8, utf16le, utf16be, utf32le, utf32be };
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enum err_types { none, iopen, oopen, eof, read, write, decode };
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enum bom_types { bom, nobom };
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protected:
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err_types error;
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enc_types encoding;
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bom_types bom_type;
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unsigned char buffer[4], index; // need 4 char buffer for optional BOM handling
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std::streamsize fill;
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fstream inputfile,outputfile;
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static const unsigned char utf8table[64];
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public:
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utf_converter(string ifname, string ofname, bom_types ofbom = bom, enc_types enc = detect) : error(none), bom_type(ofbom), encoding(enc), fill(0), index(0)
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{
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enc_types tmp_enc;
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inputfile.open(ifname.c_str(), ios::in | ios::binary);
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if (!inputfile)
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{
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error = iopen;
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return;
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}
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outputfile.open(ofname.c_str(), ios::out | ios::binary);
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if (!outputfile)
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{
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error = oopen;
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return;
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}
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tmp_enc = getBOM();
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if (enc != detect)
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{
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if (enc != tmp_enc)
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cerr << "Warning: UTF-BOM doesn't match encoding setting, but given encoding forced" << endl;
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}
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else
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encoding = tmp_enc;
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}
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err_types getError()
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{
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return error;
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}
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enc_types getBOM()
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{
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index = 0;
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/* first byte can also detect with:
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if ((buffer[0] & 0x11) || !buffer[0]))
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valid values are 0xef, 0xff, 0xfe, 0x00
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*/
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inputfile.read(reinterpret_cast<char*>(&buffer),4);
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fill = inputfile.gcount();
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// stupid utf8 bom
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if ((fill > 2) &&
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(buffer[0] == 0xef) &&
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(buffer[1] == 0xbb) &&
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(buffer[2] == 0xbf))
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{
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index += 3;
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fill -=3;
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#ifdef DISPLAY_DETECTED_UNICODE
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cerr << "UTF-8 BOM found" << endl;
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#endif
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return utf8;
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}
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if ((fill > 1) &&
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(buffer[0] == 0xfe) &&
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(buffer[1] == 0xff))
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{
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index += 2;
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fill -= 2;
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#ifdef DISPLAY_DETECTED_UNICODE
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cerr << "UTF-16BE BOM found" << endl;
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#endif
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return utf16be;
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}
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if ((fill > 1) &&
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(buffer[0] == 0xff) &&
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(buffer[1] == 0xfe))
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{
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if ((fill == 4) &&
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(buffer[2] == 0x00) &&
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(buffer[3] == 0x00))
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{
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cerr << "UTF Error: ambiguous BOM UTF-16 or UTF-32; assume UTF-32" << endl;
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fill = 0;
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index = 0;
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return utf32le;
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}
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fill -= 2;
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index += 2;
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#ifdef DISPLAY_DETECTED_UNICODE
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cerr << "UTF-16LE BOM found" << endl;
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#endif
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return utf16le;
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}
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if ((fill == 4) &&
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(buffer[0] == 0x00) &&
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(buffer[1] == 0x00) &&
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(buffer[2] == 0xfe) &&
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(buffer[3] == 0xff))
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{
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fill = 0;
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index = 0;
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#ifdef DISPLAY_DETECTED_UNICODE
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cerr << "UTF-32BE BOM found" << endl;
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#endif
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return utf32be;
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}
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return utf8; // no valid bom so use utf8 as default
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}
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std::streamsize getByte(unsigned char &c)
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{
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if (fill)
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{
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index %= 4;
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--fill;
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c = buffer[index++];
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return 1;
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} else
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{
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inputfile.read(reinterpret_cast<char*>(&c),1);
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return inputfile.gcount();
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}
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}
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std::streamsize getWord(unsigned short &w)
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{
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unsigned char c[2];
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if (!getByte(c[0]))
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return 0;
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if (!getByte(c[1]))
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return 1;
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if (encoding == utf16le)
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w = c[0] | (c[1] << 8);
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else
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w = c[1] | (c[0] << 8);
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return 2;
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}
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std::streamsize getDWord(wchar_t &d)
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{
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unsigned char c[4];
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for (int i=0;i<4;i++)
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if (!getByte(c[i]))
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return i;
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if (encoding == utf32le)
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d = c[0] | (c[1] << 8) | (c[2] << 16) | (c[3] << 24);
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else
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d = c[3] | (c[2] << 8) | (c[1] << 16) | (c[0] << 24);
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return 4;
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}
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wchar_t get_wchar_t()
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{
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wchar_t ret = (wchar_t)-1;
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switch (encoding)
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{
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case detect: // if still unknown
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encoding = utf8; // assume utf8 as default
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case utf8:
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unsigned char c, tmp;
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if (!getByte(tmp))
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return ret;
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// table for 64 bytes (all 11xxxxxx resp. >=192)
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// resulting byte is determined:
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// lower 3 bits: number of following bytes (max.8) 0=error
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// upper 5 bits: data filled with 0
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if (tmp & 0x80)
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{
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if ((tmp & 0xc0) != 0xc0)
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{
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cerr << "UTF-8 Error: invalid data byte" << endl;
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return ret;
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}
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unsigned char i = utf8table[tmp & 0x3f];
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ret = i >> 3;
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i &= 7;
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while (i--)
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{
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ret <<= 6;
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if (!getByte(c))
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return wchar_t(-1);
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ret |= c & 0x3f;
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}
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return ret;
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}
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else
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return wchar_t(tmp);
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case utf16le:
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case utf16be:
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unsigned short w,w2;
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if (getWord(w) != 2)
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return ret;
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if ((w & 0xfc00) == 0xd800) // high surrogate first
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{
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if (getWord(w2) != 2)
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return ret;
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if ((w2 & 0xfc00) != 0xdc00)
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{
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cerr << "UTF-16 Error: invalid low surrogate" << endl;
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return ret;
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}
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return (((w & 0x3ff) + 0x40) << 10) | (w2 & 0x3ff);
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}
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return w;
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case utf32le:
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case utf32be:
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if (getDWord(ret) != 4)
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return wchar_t (-1);
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return ret;
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}
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return ret;
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}
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void convert2utf16le()
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{
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unsigned char buffer[2] = { 0xff, 0xfe };
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if (bom_type == bom)
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{
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outputfile.write(reinterpret_cast<char*>(&buffer), 2); // write BOM
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}
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wchar_t c = get_wchar_t();
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while (!inputfile.eof())
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{
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buffer[0] = c & 0xff;
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buffer[1] = (c >> 8) & 0xff; // create utf16-le char
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outputfile.write(reinterpret_cast<char*>(&buffer),2); // write char
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c = get_wchar_t();
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}
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}
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~utf_converter()
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{
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if (inputfile)
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inputfile.close();
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if (outputfile)
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outputfile.close();
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}
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};
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const unsigned char utf_converter::utf8table[64] = {
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1, 9, 17, 25, 33, 41, 49, 57, 65, 73, 81, 89, 97, 105, 113, 121,
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129, 137, 145, 153, 161, 169, 177, 185, 193, 201, 209, 217, 225, 233, 241, 249,
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2, 10, 18, 26, 34, 42, 50, 58, 66, 74, 82, 90, 98, 106, 114, 122,
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3, 11, 19, 27, 35, 43, 51, 59, 4, 12, 20, 28, 5, 13, 6, 7
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};
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int main(int argc, char* argv[])
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{
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utf_converter::err_types err;
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if (argc < 3)
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{
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cout << "usage: " << argv[0] << " inputfile outputfile" << endl;
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return -1;
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}
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utf_converter::bom_types bom_type = utf_converter::bom;
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if (argc == 4 && strcasecmp(argv[3], "nobom") == 0)
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{
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bom_type = utf_converter::nobom;
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}
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utf_converter conv(argv[1], argv[2], bom_type);
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if ((err = conv.getError())!=utf_converter::none)
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{
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switch (err)
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{
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case utf_converter::iopen:
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cerr << "Couldn't open input file." << endl;
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break;
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case utf_converter::oopen:
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cerr << "Couldn't open output file." << endl;
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break;
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default:
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cerr << "Unknown error." << endl;
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}
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return -1;
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}
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else
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{
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conv.convert2utf16le();
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}
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return 0;
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}
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