103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
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/* Copyright (C) 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <cni.h>
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#include <gnu/gcj/convert/Output_EUCJIS.h>
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/* A trie structure to map unicode values to JIS codes.
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* code == -1: the character is undefined.
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* code >= 0 && code < 128: JIS-Roman - mostly Ascii.
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* code >= 128 && code < 256: Half-width Katakana.
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* code >= 256 && code < 0x8000: JIS X 0208:1997.
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* code >= 0x8000 && code < 0xFFFF: JIX X 0212-1990.
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*/
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extern unsigned short Unicode_to_JIS[];
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int
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trie_lookup (unsigned short *trie, unsigned short key)
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{
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unsigned short branch = trie[(key >> 12) & 0xf];
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if (branch == 0)
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return -1;
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branch = trie[branch + ((key >> 8) & 0xf)];
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if (branch == 0)
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return -1;
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branch = trie[branch + ((key >> 4) & 0xf)];
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if (branch == 0)
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return -1;
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return trie[branch + (key & 0xf)];
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}
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static jint
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convert_TO_EUCJIS (gnu::gcj::convert::Output_EUCJIS *encoder,
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jchar *ptr, jint inlength)
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{
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int orig_inlength = inlength;
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jint outbuf_length = encoder->buf->length;
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for (;;)
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{
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if (encoder->count >= outbuf_length)
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break;
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if (encoder->pending1 >= 0)
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{
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elements(encoder->buf)[encoder->count++] = encoder->pending1;
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encoder->pending1 = encoder->pending2;
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encoder->pending2 = -1;
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continue;
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}
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if (inlength == 0)
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break;
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jchar ch = *ptr++;
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inlength--;
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unsigned short val = trie_lookup(Unicode_to_JIS, ch);
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if (val < 0x80)
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{
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if (val == 0xffff)
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val = '?';
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}
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else if (val <= 0xFF)
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{
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encoder->pending1 = val;
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encoder->pending2 = -1;
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val = 0x8e;
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}
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else if (val < 0x8000)
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{
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val |= 0x8080;
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encoder->pending1 = val & 0xff;
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val = val >> 8;
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encoder->pending2 = -1;
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}
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else
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{
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val |= 0x8080;
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encoder->pending1 = val >> 8;
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encoder->pending2 = val & 0xff;
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val = 0x8f;
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}
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elements(encoder->buf)[encoder->count++] = val;
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}
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return orig_inlength - inlength;
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}
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jint
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gnu::gcj::convert::Output_EUCJIS::write (jcharArray inbuffer,
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jint inpos, jint inlength)
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{
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return convert_TO_EUCJIS(this, &elements(inbuffer)[inpos], inlength);
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}
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jint
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gnu::gcj::convert::Output_EUCJIS::write (jstring str, jint inpos,
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jint inlength, jcharArray)
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{
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return convert_TO_EUCJIS(this, _Jv_GetStringChars(str)+inpos, inlength);
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}
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