105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
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/* iconvtc.c -- Interface to iconv transcoding routines
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(c) 1998-2008 (W3C) MIT, ERCIM, Keio University
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See tidy.h for the copyright notice.
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*/
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#include "tidy.h"
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#include "forward.h"
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#include "streamio.h"
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#ifdef TIDY_ICONV_SUPPORT
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#include <iconv.h>
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/* maximum number of bytes for a single character */
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#define TC_INBUFSIZE 16
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/* maximum number of characters per byte sequence */
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#define TC_OUTBUFSIZE 16
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Bool IconvInitInputTranscoder(void)
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{
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return no;
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}
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void IconvUninitInputTranscoder(void)
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{
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return;
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}
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int IconvGetChar(byte firstByte, StreamIn * in, uint * bytesRead)
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{
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iconv_t cd;
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TidyInputSource * source;
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char inbuf[TC_INBUFSIZE] = { 0 };
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char outbuf[TC_OUTBUFSIZE] = { 0 };
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size_t inbufsize = 0;
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assert( in != NULL );
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assert( &in->source != NULL );
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assert( bytesRead != NULL );
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assert( in->iconvptr != 0 );
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cd = (iconv_t)in->iconvptr;
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source = &in->source;
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inbuf[inbufsize++] = (char)firstByte;
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while(inbufsize < TC_INBUFSIZE)
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{
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char * outbufptr = (char*)outbuf;
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char * inbufptr = (char*)inbuf;
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size_t readNow = inbufsize;
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size_t writeNow = TC_OUTBUFSIZE;
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size_t result = 0;
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int iconv_errno = 0;
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int nextByte = EndOfStream;
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result = iconv(cd, (const char**)&inbufptr, &readNow, (char**)&outbufptr, &writeNow);
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iconv_errno = errno;
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if (result != (size_t)(-1))
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{
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int c;
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/* create codepoint from UTF-32LE octets */
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c = (unsigned char)outbuf[0];
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c += (unsigned char)outbuf[1] << 8;
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c += (unsigned char)outbuf[2] << 16;
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c += (unsigned char)outbuf[3] << 32;
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/* set number of read bytes */
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*bytesRead = inbufsize;
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return c;
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}
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assert( iconv_errno != EILSEQ ); /* broken multibyte sequence */
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assert( iconv_errno != E2BIG ); /* not enough memory */
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assert( iconv_errno == EINVAL ); /* incomplete sequence */
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/* we need more bytes */
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nextByte = source->getByte(source->sourceData);
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if (nextByte == EndOfStream)
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{
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/* todo: error message for broken stream? */
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*bytesRead = inbufsize;
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return EndOfStream;
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}
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inbuf[inbufsize++] = (char)nextByte;
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}
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/* No full character found after reading TC_INBUFSIZE bytes, */
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/* give up to read this stream, it's obviously unreadable. */
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/* todo: error message for broken stream? */
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return EndOfStream;
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}
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#endif /* TIDY_ICONV_SUPPORT */
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