Parent: [79c1f8] (diff)

Child: [b28eaf] (diff)

Download this file

transcode.cpp    205 lines (182 with data), 4.8 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
#ifndef lint
static char rcsid[] = "@(#$Id: transcode.cpp,v 1.12 2008-09-15 08:01:29 dockes Exp $ (C) 2004 J.F.Dockes";
#endif
/*
* 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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef TEST_TRANSCODE
#include "autoconfig.h"
#include <string>
#include <iostream>
#ifndef NO_NAMESPACES
using std::string;
#endif /* NO_NAMESPACES */
#include <errno.h>
#include <iconv.h>
#include "transcode.h"
#include "debuglog.h"
#ifdef RCL_ICONV_INBUF_CONST
#define ICV_P2_TYPE const char**
#else
#define ICV_P2_TYPE char**
#endif
// We gain approximately 28% exec time for word at a time conversions by
// caching the iconv_open thing. This is probably not worth it.
//#define ICONV_CACHE_OPEN
bool transcode(const string &in, string &out, const string &icode,
const string &ocode, int *ecnt)
{
#ifdef ICONV_CACHE_OPEN
static iconv_t ic;
static string cachedicode;
static string cachedocode;
#else
iconv_t ic;
#endif
bool ret = false;
const int OBSIZ = 8192;
char obuf[OBSIZ], *op;
bool icopen = false;
int mecnt = 0;
out.erase();
size_t isiz = in.length();
out.reserve(isiz);
const char *ip = in.c_str();
#ifdef ICONV_CACHE_OPEN
if (cachedicode.compare(icode) || cachedocode.compare(ocode)) {
#endif
if((ic = iconv_open(ocode.c_str(), icode.c_str())) == (iconv_t)-1) {
out = string("iconv_open failed for ") + icode
+ " -> " + ocode;
goto error;
}
#ifdef ICONV_CACHE_OPEN
cachedicode.assign(icode);
cachedocode.assign(ocode);
} else {
iconv(ic, 0, 0, 0, 0);
}
#else
icopen = true;
#endif
while (isiz > 0) {
size_t osiz;
op = obuf;
osiz = OBSIZ;
if(iconv(ic, (ICV_P2_TYPE)&ip, &isiz, &op, &osiz) == (size_t)-1 &&
errno != E2BIG) {
#if 0
out.erase();
out = string("iconv failed for ") + icode + " -> " + ocode +
" : " + strerror(errno);
#endif
if (errno == EILSEQ) {
LOGDEB1(("transcode:iconv: bad input seq.: shift, retry\n"));
LOGDEB1((" Input consumed %d output produced %d\n",
ip - in.c_str(), out.length() + OBSIZ - osiz));
out.append(obuf, OBSIZ - osiz);
out += "?";
mecnt++;
ip++;isiz--;
continue;
}
goto error;
}
out.append(obuf, OBSIZ - osiz);
}
#ifndef ICONV_CACHE_OPEN
if(iconv_close(ic) == -1) {
out.erase();
out = string("iconv_close failed for ") + icode
+ " -> " + ocode;
goto error;
}
icopen = false;
#endif
ret = true;
error:
#ifndef ICONV_CACHE_OPEN
if (icopen)
iconv_close(ic);
#endif
if (mecnt)
LOGDEB(("transcode: [%s]->[%s] %d errors\n",
icode.c_str(), ocode.c_str(), mecnt));
if (ecnt)
*ecnt = mecnt;
return ret;
}
#else
#include <errno.h>
#include <string>
#include <iostream>
#include <unistd.h>
#include <fcntl.h>
using namespace std;
#include "readfile.h"
#include "transcode.h"
// Repeatedly transcode a small string for timing measurements
static const string testword("\xc3\xa9\x6c\x69\x6d\x69\x6e\xc3\xa9\xc3\xa0");
// Without cache 10e6 reps on macpro -> 1.88 S
// With cache -> 1.56
void looptest()
{
cout << testword << endl;
string out;
for (int i = 0; i < 1000*1000; i++) {
if (!transcode(testword, out, "UTF-8", "UTF-16BE")) {
cerr << "Transcode failed" << endl;
break;
}
}
}
int main(int argc, char **argv)
{
#if 0
looptest();
exit(0);
#endif
if (argc != 5) {
cerr << "Usage: trcsguess ifilename icode ofilename ocode" << endl;
exit(1);
}
const string ifilename = argv[1];
const string icode = argv[2];
const string ofilename = argv[3];
const string ocode = argv[4];
string text;
if (!file_to_string(ifilename, text)) {
cerr << "Couldnt read file, errno " << errno << endl;
exit(1);
}
string out;
if (!transcode(text, out, icode, ocode)) {
cerr << out << endl;
exit(1);
}
int fd = open(ofilename.c_str(), O_CREAT|O_TRUNC|O_WRONLY, 0666);
if (fd < 0) {
perror("Open/create output");
exit(1);
}
if (write(fd, out.c_str(), out.length()) != (int)out.length()) {
perror("write");
exit(1);
}
close(fd);
exit(0);
}
#endif