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/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
#include <config.h>
#include <gcj/cni.h>
#include <gnu/gcj/convert/Input_SJIS.h>
#define ERROR_CHAR 0xFFFD
extern unsigned short JIS0208_to_Unicode[84][94];
extern unsigned short JIS0212_to_Unicode[76][94];
jint
gnu::gcj::convert::Input_SJIS::read(jcharArray outbuffer, jint outpos,
jint count)
{
jint start_outpos = outpos;
for (;;)
{
if (outpos - start_outpos >= count)
break;
if (inpos >= inlength)
break;
int b = ((unsigned char*) elements(inbuffer))[inpos++];
if (first_byte == 0)
{
if (b < 128)
{
#if 1
// Technically, we should translate 0x5c to Yen symbol;
// in practice, it is not clear.
if (b == 0x5c)
b = 0x00A5; // Yen sign.
#endif
elements(outbuffer)[outpos++] = (char) b;
}
else if (b >= 0xA1 && b <= 0xDF)
{
b += 0xFF61 - 0xA1;
elements(outbuffer)[outpos++] = b;
}
else
first_byte = b;
}
else
{
// From Lunde: "CJKV Informatio Processing", O'Reilly, 1999, p 420:
bool adjust = b < 159;
int rowOffset = first_byte < 160 ? 112 : 176;
int cellOffset = adjust ? (b > 127 ? 32 : 31) : 126;
first_byte = ((first_byte - rowOffset) << 1) - adjust;
b -= cellOffset;
first_byte -= 33;
b -= 33;
if ((unsigned) first_byte >= 84 || (unsigned) b >= 94)
b = ERROR_CHAR;
else
{
b = JIS0208_to_Unicode[first_byte][b];
if (b == 0)
b = ERROR_CHAR;
}
elements(outbuffer)[outpos++] = b;
first_byte = 0;
}
}
return outpos - start_outpos;
}
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