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175 lines
5.7 KiB
C
175 lines
5.7 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* sjis2euc.c */
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#include "intlpriv.h"
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extern int MK_OUT_OF_MEMORY;
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/* SJIS to EUC Algorithm. */
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#define TwoByteSJIS2EUC(sjisp, eucp, offset) { \
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*eucp = ((*sjisp++ - offset) << 1) | 0x80; /* 1st EUC byte */ \
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if (*sjisp < 0x9F) { /* check 2nd SJIS byte */ \
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*eucp++ -= 1; /* adjust 1st EUC byte */ \
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if (*sjisp > 0x7F) \
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*eucp++ = (*sjisp++ - 0x20) | 0x80; \
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else \
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*eucp++ = (*sjisp++ - 0x1F) | 0x80; \
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} else { \
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eucp++; \
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*eucp++ = (*sjisp++ - 0x7E) | 0x80; \
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} \
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}
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/* net_sjis2euc(sjisbuf, sjisbufsz)
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* Args:
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* sjisbuf: Ptr to a buf of SJIS chars
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* sjisbufsz: Size in bytes of sjisbuf
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* uncvtbuf: If entire buffer was converted, uncvtbuf[0] will be nul,
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* else this points to SJIS chars that were NOT converted
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* and mz_sjis2euc() with additional SJIS chars appended.
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* Return:
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* Returns NULL on failure, otherwise it returns a pointer to a buffer of
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* converted SJIS characters. Caller must XP_FREE() this memory.
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*
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* Description:
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* Allocate destination EUC buffer.
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*
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* If byte in ASCII range, just copy it to EUC buffer.
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* If Half-width SJIS katakana (1 byte), convert to Half-width EUC katakana.
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* If 2-byte SJIS, convert to 2-byte EUC.
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* Otherwise assume user-defined SJIS, just copy 2 bytes.
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*
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* If either SJIS buffer does not contain complete SJIS char or EUC buffer
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* is full, then return unconverted SJIS to caller. Caller should
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* append more data and recall mz_sjis2euc.
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*/
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MODULE_PRIVATE unsigned char *
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mz_sjis2euc( CCCDataObject obj,
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const unsigned char *sjisbuf, /* SJIS buf for conversion */
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int32 sjisbufsz) /* SJIS buf size in bytes */
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{
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unsigned char *tobuf = NULL;
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int32 tobufsz;
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register unsigned char *sjisp, *tobufp; /* current byte in bufs */
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register unsigned char *sjisep, *tobufep; /* end of buffers */
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int32 uncvtlen;
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unsigned char *uncvtbuf = INTL_GetCCCUncvtbuf(obj);
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/* Allocate a EUC buffer: */
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/* In the worst case ( all Half-width Kanas ), the converted */
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/* EUC will be 2X the size of the SJIS + 1 for nul byte */
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uncvtlen = strlen((char *)uncvtbuf);
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tobufsz = ((sjisbufsz + uncvtlen) << 1) + 1;
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if ((tobuf = (unsigned char *)XP_ALLOC(tobufsz)) == (unsigned char *)NULL) {
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INTL_SetCCCRetval(obj, MK_OUT_OF_MEMORY);
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return(NULL);
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}
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/* Initialize pointers, etc. */
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sjisp = (unsigned char *)sjisbuf;
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sjisep = sjisp + sjisbufsz - 1;
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#define uncvtp tobufp /* use tobufp as temp */
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/* If prev. unconverted chars, append unconverted
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* chars w/new chars and try to process.
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*/
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if (uncvtbuf[0] != '\0') {
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uncvtp = uncvtbuf + uncvtlen;
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while (uncvtp < (uncvtbuf + UNCVTBUF_SIZE) &&
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sjisp <= sjisep)
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*uncvtp++ = *sjisp++;
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*uncvtp = '\0'; /* nul terminate */
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sjisp = uncvtbuf; /* process unconverted first */
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sjisep = uncvtp - 1;
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}
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#undef uncvtp
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tobufp = tobuf;
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tobufep = tobufp + tobufsz - 1; /* save space for terminating null */
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WHILELOOP:
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/* While SJIS data && space in EUC buf. */
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while ((sjisp <= sjisep) && (tobufp <= tobufep)) {
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if (*sjisp < 0x80) {
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/* ASCII/JIS-Roman */
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*tobufp++ = *sjisp++;
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} else if (*sjisp < 0xA0) {
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/* 1st byte of 2-byte low SJIS. */
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if (sjisp+1 > sjisep) /* No 2nd byte in SJIS buffer? */
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break;
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TwoByteSJIS2EUC(sjisp, tobufp, 0x70);
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} else if (*sjisp==0xA0) {
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/* SJIS half-width space. */
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/* Just treat like Roman?? */
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*tobufp++ = *sjisp++;
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} else if (*sjisp < 0xE0) {
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/* SJIS half-width katakana */
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*tobufp++ = SS2;
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*tobufp++ = *sjisp | 0x80; /* Set 8th bit for EUC & SJIS */
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sjisp++;
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} else if (*sjisp < 0xF0) {
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/* 1st byte of 2-byte high SJIS */
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if (sjisp+1 > sjisep) /* No 2nd byte in SJIS buffer? */
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break;
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TwoByteSJIS2EUC(sjisp, tobufp, 0xB0);
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} else {
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/* User Defined SJIS: copy bytes */
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if (sjisp+1 > sjisep) /* No 2nd byte in SJIS buf? */
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break;
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*tobufp++ = *sjisp++; /* Just copy 2 bytes. */
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*tobufp++ = *sjisp++;
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}
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}
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if (uncvtbuf[0] != '\0') {
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/* jisp pts to 1st unprocessed char in
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* jisbuf. Some may have been processed
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* while processing unconverted chars,
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* so set up ptrs not to process them
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* twice.
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*/
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sjisp = (unsigned char *)sjisbuf + (sjisp - uncvtbuf - uncvtlen);
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sjisep = (unsigned char *)sjisbuf + sjisbufsz - 1;
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uncvtbuf[0] = '\0'; /* No more uncoverted chars. */
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goto WHILELOOP; /* Process new data */
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}
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*tobufp = '\0'; /* null terminate EUC data */
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INTL_SetCCCLen(obj, tobufp - tobuf); /* length not counting null */
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if (sjisp <= sjisep) { /* uncoverted SJIS? */
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tobufp = uncvtbuf; /* reuse the tobufp as a TEMP */
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while (sjisp <= sjisep)
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*tobufp++ = *sjisp++;
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*tobufp = '\0'; /* null terminate */
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}
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return(tobuf);
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}
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