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285 lines
8.6 KiB
285 lines
8.6 KiB
// Copyright (c) Microsoft Corpration
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//
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// File Name: sjis2euc.c
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// Owner: Tetsuhide Akaishi
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// Revision: 1.00 02/21/'93 Tetsuhide Akaishi
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//
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#include "win32.h"
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#include "fechrcnv.h"
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//Shift JIS(SJC) to EUC Conversion algorithm
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//Two byte KANJI
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// - 1st byte of Shift JIS charcter
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// (XX = Hex value of 1st byte of Shift JIS Charcter)
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// Range 0x81 - 0x9f
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// (2nd byte of Shift JIS is less than or equals to 0x9e)
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// (EUC odd)0xa1-0xdd
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// EUC 1st byte = (XX-0x81)*2 + 0xa1
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// (2nd byte of Shift JIS is greater than or equals to 0x9f)
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// (EUC even)0xa2-0xde
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// EUC 1st byte = (XX-0x81)*2 + 0xa2
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//
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// Range 0xe0 - 0xef
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// (2nd byte of Shift JIS is less than or equals to 0x9e)
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// (EUC odd)0xdf-0xfd
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// EUC 1st byte = (XX-0xe0)*2 + 0xdf
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// (2nd byte of Shift JIS is greater than or equals to 0x9f)
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// (EUC even)0xa2-0xde
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// EUC 1st byte = (XX-0xe0)*2 + 0xe0
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//
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// - 2nd byte of Shift JIS charcter
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// (YY = Hex value of 2nd byte of Shift JIS Charcter)
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// Range 0x40 - 0x7e (EUC)0xa1 - 0xdf
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// EUC 2nd byte = (YY+0x61)
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// Range 0x80 - 0x9e (EUC)0xe0 - 0xfe
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// EUC 2nd byte = (YY+0x60)
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// Range 0x9f - 0xfc (EUC)0xa1 - 0xfe
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// EUC 2nd byte = (YY+0x02)
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//
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// Range 0x0a1 - 0x0df(Hankaku KATAKANA)
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// 1st byte of EUC charcter = 0x08e
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// 2nd byte if EUC charcter = C6220 Hankaku KATAKANA code
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// (same byte value as Shift JIS Hankaku KATAKANA) (0x0a1 - 0x0df)
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//@
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//
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// Syntax:
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int ShiftJISChar_to_EUCChar ( UCHAR *pShiftJIS, UCHAR *pEUC )
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// The ShiftJISChar_to_EUCChar function convert one Shift JIS character
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// to a JIS code string.
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//
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// UCHAR *pShiftJIS Points to the character string to be converted.
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//
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// UCHAR *pEUC Points to a buffer that receives the convert string
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// from Shift JIS Code to EUC Code.
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//
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// Return Value
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// The number of bytes to copy.
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//
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{
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if ( *pShiftJIS >= 0x081 && *pShiftJIS <= 0x09f ) {
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if ( *(pShiftJIS+1) <= 0x09e ) {
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*pEUC = ((*pShiftJIS)-0x081)*2+0x0a1;
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}
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else {
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*pEUC = ((*pShiftJIS)-0x081)*2+0x0a2;
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}
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goto SECOND_BYTE;
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}
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if ( *pShiftJIS >= 0x0e0 && *pShiftJIS <= 0x0ef ) {
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if ( *(pShiftJIS+1) <= 0x09e ) {
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*pEUC = ((*pShiftJIS)-0x0e0)*2+0x0df;
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}
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else {
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*pEUC = ((*pShiftJIS)-0x0e0)*2+0x0e0;
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}
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goto SECOND_BYTE;
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}
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// Is the charcter Hankaku KATAKANA ?
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if ( *pShiftJIS >= 0x0a1 && *pShiftJIS <= 0x0df ) {
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*pEUC = 0x08e;
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*(pEUC+1) = *pShiftJIS;
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return( 2 );
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}
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// Is the charcter IBM Extended Charcter?
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if ( *pShiftJIS >= 0x0fa && *pShiftJIS <= 0x0fc ) {
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// There are no IBM Extended Charcte in EUC charset.
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*pEUC = ' ';
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*(pEUC+1) = ' ';
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return( 2 );
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}
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// Is the charcter ASCII charcter ?
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*pEUC = *pShiftJIS;
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return ( 1 );
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SECOND_BYTE:
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if ( *(pShiftJIS+1) >= 0x040 && *(pShiftJIS+1) <= 0x07e ) {
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*(pEUC+1) = *(pShiftJIS + 1) + 0x061;
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}
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else {
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if ( *(pShiftJIS+1) >= 0x080 && *(pShiftJIS+1) <= 0x09e ) {
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*(pEUC+1) = *(pShiftJIS + 1) + 0x060;
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}
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else {
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*(pEUC+1) = *(pShiftJIS + 1) + 0x002;
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}
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}
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return ( 2 );
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}
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int ShiftJIS_to_EUC ( UCHAR *pShiftJIS, int ShiftJIS_len,
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UCHAR *pEUC, int EUC_len )
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// The ShiftJIS_to_JIS function convert a character string as Shift JIS code
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// to a EUC code string.
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//
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// UCHAR *pShiftJIS Points to the character string to be converted.
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//
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// int ShiftJIS_len Specifies the size in bytes of the string pointed
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// to by the pShiftJIS parameter. If this value is -1,
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// the string is assumed to be NULL terminated and the
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// length is calculated automatically.
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//
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// UCHAR *pEUC Points to a buffer that receives the convert string
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// from Shift JIS Code to EUC Code.
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//
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// int EUC_len Specifies the size, in EUC characters of the buffer
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// pointed to by the pEUC parameter. If the value is zero,
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// the function returns the number of EUC characters
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// required for the buffer, and makes no use of the pEUC
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// buffer.
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//
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// Return Value
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// If the function succeeds, and EUC_len is nonzero, the return value is the
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// number of EUC characters written to the buffer pointed to by pEUC.
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//
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// If the function succeeds, and EUC_len is zero, the return value is the
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// required size, in EUC characters, for a buffer that can receive the
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// converted string.
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//
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// If the function fails, the return value is -1. The error mean pEUC buffer
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// is small for setting converted strings.
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//
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{
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int re; // Convert Lenght
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int i; // Loop Counter
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if ( ShiftJIS_len == -1 ) {
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// If length is not set, last character of the strings is NULL.
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ShiftJIS_len = strlen ( pShiftJIS ) + 1;
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}
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i = 0;
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re = 0;
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if ( EUC_len == 0 ) {
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// Only retrun the required size
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while ( i < ShiftJIS_len ) {
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if ( SJISISKANJI(*pShiftJIS) ) {
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pShiftJIS+=2;
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i+=2;
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re+=2;
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continue;
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}
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if ( SJISISKANA(*pShiftJIS) ) {
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pShiftJIS++;
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i++;
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re+=2;
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continue;
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}
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pShiftJIS++;
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i++;
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re++;
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}
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return ( re );
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}
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while ( i < ShiftJIS_len ) {
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if ( *pShiftJIS >= 0x081 && *pShiftJIS <= 0x09f ) {
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if ( re + 1 >= EUC_len ) { // Buffer Over?
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return ( -1 );
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}
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if ( *(pShiftJIS+1) <= 0x09e ) {
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*pEUC = ((*pShiftJIS)-0x081)*2+0x0a1;
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}
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else {
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*pEUC = ((*pShiftJIS)-0x081)*2+0x0a2;
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}
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pShiftJIS++; // Next Char
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pEUC++;
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if ( (*pShiftJIS) >= 0x040 && (*pShiftJIS) <= 0x07e ) {
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(*pEUC) = (*pShiftJIS) + 0x061;
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}
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else {
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if ( (*pShiftJIS) >= 0x080 && (*pShiftJIS) <= 0x09e ) {
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(*pEUC) = (*pShiftJIS) + 0x060;
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}
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else {
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(*pEUC) = (*pShiftJIS) + 0x002;
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}
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}
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re+=2;
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i+=2;
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pShiftJIS++;
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pEUC++;
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continue;
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}
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if ( *pShiftJIS >= 0x0e0 && *pShiftJIS <= 0x0ef ) {
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if ( re + 1 >= EUC_len ) { // Buffer Over?
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return ( -1 );
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}
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if ( *(pShiftJIS+1) <= 0x09e ) {
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*pEUC = ((*pShiftJIS)-0x0e0)*2+0x0df;
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}
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else {
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*pEUC = ((*pShiftJIS)-0x0e0)*2+0x0e0;
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}
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pShiftJIS++; // Next Char
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pEUC++;
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if ( (*pShiftJIS) >= 0x040 && (*pShiftJIS) <= 0x07e ) {
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(*pEUC) = (*pShiftJIS) + 0x061;
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}
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else {
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if ( (*pShiftJIS) >= 0x080 && (*pShiftJIS) <= 0x09e ) {
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(*pEUC) = (*pShiftJIS) + 0x060;
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}
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else {
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(*pEUC) = (*pShiftJIS) + 0x002;
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}
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}
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re+=2;
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i+=2;
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pShiftJIS++;
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pEUC++;
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continue;
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}
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// Is the charcter Hankaku KATAKANA ?
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if ( *pShiftJIS >= 0x0a1 && *pShiftJIS <= 0x0df ) {
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if ( re + 1 >= EUC_len ) { // Buffer Over?
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return ( -1 );
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}
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*pEUC = 0x08e;
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pEUC++;
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(*pEUC) = *pShiftJIS;
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re+=2;
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i++;
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pShiftJIS++;
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pEUC++;
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continue;
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}
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// Is the charcter IBM Extended Charcter?
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if ( *pShiftJIS >= 0x0fa && *pShiftJIS <= 0x0fc ) {
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if ( re + 1 >= EUC_len ) { // Buffer Over?
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return ( -1 );
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}
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// There are no IBM Extended Charcte in EUC charset.
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*pEUC = ' ';
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pEUC++;
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(*pEUC) = ' ';
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re+=2;
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i+=2;
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pShiftJIS+=2;
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pEUC++;
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continue;
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}
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// Is the charcter ASCII charcter ?
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if ( re >= EUC_len ) { // Buffer Over?
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return ( -1 );
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}
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*pEUC = *pShiftJIS;
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re++;
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i++;
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pShiftJIS++;
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pEUC++;
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continue;
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}
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return ( re );
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}
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