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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2007 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/encodinginputstream.h>
#include <iconv.h>
#include <cerrno>
using namespace Strigi;
#ifdef ICONV_SECOND_ARGUMENT_IS_CONST
#define ICONV_CONST const
#else
#define ICONV_CONST
#endif
class EncodingInputStream::Private {
public:
StreamBuffer<char> charbuf;
EncodingInputStream* const p;
InputStream* input;
iconv_t converter;
int32_t charsLeft;
bool finishedEncoding;
Private(EncodingInputStream* eis, InputStream* i, const char* inenc,
const char* outenc) :p(eis), input(i),
converter((iconv_t)-1), charsLeft(0), finishedEncoding(false) {
if (outenc == 0) {
outenc = "UTF-8";
}
converter = iconv_open(outenc, inenc);
}
~Private() {
if (converter != (iconv_t) -1) {
iconv_close(converter);
}
}
int32_t decode(char* start, int32_t space);
};
EncodingInputStream::EncodingInputStream(InputStream* s, const char* inenc,
const char* outenc)
:p(new Private(this, s, inenc, outenc)) {
if (inenc == 0) {
m_status = Error;
m_error = "No input encoding provided.";
return;
}
m_status = Ok;
// check if the converter is valid
if (p->converter == (iconv_t) -1) {
m_error = "conversion from '";
m_error.append(inenc);
m_error.append("' to '");
m_error.append(outenc ? outenc : "(null)");
m_error.append(" not available.");
m_status = Error;
return;
}
p->charbuf.setSize(262);
p->charsLeft = 0;
}
EncodingInputStream::~EncodingInputStream() {
delete p;
}
int32_t
EncodingInputStream::Private::decode(char* start, int32_t space) {
// decode from charbuf
ICONV_CONST char *inbuf = charbuf.readPos;
size_t inbytesleft = charbuf.avail;
size_t outbytesleft = space;
char *outbuf = 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
p->m_error = "Invalid multibyte sequence.";
p->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)(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);
p->m_error = "inputstreamreader error: ";
p->m_error.append(tmp);
fprintf(stderr, "inputstreamreader::error %d\n", errno);
p->m_status = Error;
return -1;
}
} else { //input sequence was completely converted
charbuf.readPos = charbuf.start;
charbuf.avail = 0;
nwritten = (int32_t)(outbuf - start);
if (input == 0) {
finishedEncoding = true;
}
}
return nwritten;
}
int32_t
EncodingInputStream::fillBuffer(char* start, int32_t space) {
// fill up charbuf
if (p->input && p->charbuf.readPos == p->charbuf.start) {
const char *begin;
int32_t numRead;
numRead = p->input->read(begin, 1, p->charbuf.size - p->charbuf.avail);
//printf("filled up charbuf\n");
if (numRead < -1) {
m_error = p->input->error();
m_status = Error;
p->input = 0;
return numRead;
}
if (numRead < 1) {
// signal end of input buffer
p->input = 0;
if (p->charbuf.avail) {
m_error = "stream ends on incomplete character";
m_status = Error;
}
return -1;
}
// copy data into other buffer
std::memmove(p->charbuf.start + p->charbuf.avail, begin, numRead);
p->charbuf.avail = numRead + p->charbuf.avail;
}
// decode
int32_t n = p->decode(start, space);
//printf("decoded %i\n", n);
return n;
}
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