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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2006 Jos van den Oever <jos@vandenoever.info>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <strigi/inputstreamreader.h>
#include <strigi/strigiconfig.h>
#include <cerrno>
#include <iconv.h>
#ifdef ICONV_SECOND_ARGUMENT_IS_CONST
#define ICONV_CONST const
#else
#define ICONV_CONST
#endif
using namespace Strigi;
InputStreamReader::InputStreamReader(InputStream* i, const char* enc) {
m_status = Ok;
finishedDecoding = false;
input = i;
if (enc == 0) enc = "UTF-8";
#ifdef _LIBICONV_H
if (sizeof(wchar_t) == 4) {
converter = iconv_open("UCS-4-INTERNAL", enc);
} else if (sizeof(wchar_t) == 2) {
converter = iconv_open("UCS-2-INTERNAL", enc);
#else
if (sizeof(wchar_t) > 1) {
converter = iconv_open("WCHAR_T", enc);
#endif
} else {
converter = iconv_open("ASCII", enc);
}
// check if the converter is valid
if (converter == (iconv_t) -1) {
m_error = "conversion from '";
m_error += enc;
m_error += "' not available.";
m_status = Error;
return;
}
charbuf.setSize(262);
//mark(262);
charsLeft = 0;
}
InputStreamReader::~InputStreamReader() {
if (converter != (iconv_t) -1) {
iconv_close(converter);
}
}
int32_t
InputStreamReader::decode(wchar_t* start, int32_t space) {
// decode from charbuf
ICONV_CONST char *inbuf = charbuf.readPos;
size_t inbytesleft = charbuf.avail;
size_t outbytesleft = sizeof(wchar_t)*space;
char *outbuf = (char*)start;
size_t r = iconv(converter, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
int32_t nwritten;
if (r == (size_t)-1) {
switch (errno) {
case EILSEQ: //invalid multibyte sequence
m_error = "Invalid multibyte sequence.";
m_status = Error;
return -1;
case EINVAL: // last character is incomplete
// move from inbuf to the end to the start of
// the buffer
std::memmove(charbuf.start, inbuf, inbytesleft);
charbuf.readPos = charbuf.start;
charbuf.avail = (int32_t)inbytesleft;
nwritten = (int32_t)(((wchar_t*)outbuf) - start);
break;
case E2BIG: // output buffer is full
charbuf.readPos += charbuf.avail - inbytesleft;
charbuf.avail = (int32_t)inbytesleft;
nwritten = space;
break;
default:
char tmp[10];
snprintf(tmp, 10, "%i", errno);
m_error = "inputstreamreader error: ";
m_error.append(tmp);
fprintf(stderr, "inputstreamreader::error %d\n", errno);
m_status = Error;
return -1;
}
} else { //input sequence was completely converted
charbuf.readPos = charbuf.start;
charbuf.avail = 0;
nwritten = (int32_t)(((wchar_t*)outbuf) - start);
if (input == 0) {
finishedDecoding = true;
}
}
return nwritten;
}
int32_t
InputStreamReader::fillBuffer(wchar_t* start, int32_t space) {
// fill up charbuf
if (input && charbuf.readPos == charbuf.start) {
const char *begin;
int32_t numRead;
numRead = input->read(begin, 1, charbuf.size - charbuf.avail);
//printf("filled up charbuf\n");
if (numRead < -1) {
m_error = input->error();
m_status = Error;
input = 0;
return numRead;
}
if (numRead < 1) {
// signal end of input buffer
input = 0;
if (charbuf.avail) {
m_error = "stream ends on incomplete character";
m_status = Error;
}
return -1;
}
// copy data into other buffer
std::memmove(charbuf.start + charbuf.avail, begin, numRead);
charbuf.avail = numRead + charbuf.avail;
}
// decode
int32_t n = decode(start, space);
//printf("decoded %i\n", n);
return n;
}
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