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#include "dietfeatures.h"
#include <errno.h>
#include "dieticonv.h"
#include <netinet/in.h>
size_t iconv(iconv_t cd, const char* * inbuf, size_t *
inbytesleft, char* * outbuf, size_t * outbytesleft) {
size_t converted=0,i,j,k;
int bits;
if (!inbuf || !*inbuf) return 0;
while (*inbytesleft) {
unsigned int v=0;
v=*(unsigned char*)*inbuf;
i=j=1;
switch (ic_from(cd)) {
case UCS_2:
v=ntohs(*(unsigned short*)*inbuf);
i=2;
break;
case UCS_4:
v=ntohs(*(unsigned int*)*inbuf);
i=4;
case ISO_8859_1:
break;
case UTF_8:
if (!(v&0x80)) break;
for (i=0xC0; i!=0xFC; i=(i>>1)+0x80)
if ((v&((i>>1)|0x80))==i) {
v&=~i;
break;
}
for (i=1; ((*inbuf)[i]&0xc0)==0x80; ++i)
v=(v<<6)|((*inbuf)[i]&0x3f);
/* printf("got %u in %u bytes, buflen %u\n",v,i,*inbytesleft); */
break;
}
switch (ic_to(cd)) {
case ISO_8859_1:
**outbuf=(unsigned char)v;
break;
case UCS_2:
*(unsigned short*)*outbuf=htons(v);
j=2;
break;
case UCS_4:
*(unsigned int*)*outbuf=htonl(v);
j=4;
break;
case UTF_8:
if (v>0x04000000) { bits=30; **outbuf=0xFC; j=6; } else
if (v>0x00200000) { bits=24; **outbuf=0xF8; j=5; } else
if (v>0x00010000) { bits=18; **outbuf=0xF0; j=4; } else
if (v>0x00000800) { bits=12; **outbuf=0xE0; j=3; } else
if (v>0x00000080) { bits=6; **outbuf=0xC0; j=2; } else
{ bits=0; **outbuf=0; }
**outbuf |= (unsigned char)(v>>bits);
if (*outbytesleft<j) {
errno=E2BIG;
return (size_t)-1;
}
for (k=1; k<j; ++k) {
bits-=6;
(*outbuf)[k]=0x80+((v>>bits)&0x3F);
}
break;
}
*inbuf+=i; *inbytesleft-=i; ++converted;
*outbuf+=j; *outbytesleft-=j;
}
return converted;
}
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