mirror of
https://github.com/holub/mame
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347 lines
8.1 KiB
C
347 lines
8.1 KiB
C
/*********************************************************************
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unicode.c
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Unicode related functions
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Copyright (c) 1996-2007, Nicola Salmoria and the MAME Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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*********************************************************************/
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#include "unicode.h"
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/*-------------------------------------------------
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uchar_isvalid - return true if a given
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character is a legitimate unicode character
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-------------------------------------------------*/
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int uchar_isvalid(unicode_char uchar)
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{
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return (uchar < 0x110000) && !((uchar >= 0xd800) && (uchar <= 0xdfff));
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}
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/*-------------------------------------------------
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uchar_from_utf8 - convert a UTF-8 sequence
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into a unicode character
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-------------------------------------------------*/
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int uchar_from_utf8(unicode_char *uchar, const char *utf8char, size_t count)
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{
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unicode_char c, minchar;
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int auxlen, i;
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char auxchar;
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/* validate parameters */
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if (utf8char == NULL || count == 0)
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return 0;
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/* start with the first byte */
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c = (unsigned char) *utf8char;
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count--;
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utf8char++;
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/* based on that, determine how many additional bytes we need */
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if (c < 0x80)
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{
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/* unicode char 0x00000000 - 0x0000007F */
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c &= 0x7f;
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auxlen = 0;
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minchar = 0x00000000;
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}
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else if (c >= 0xc0 && c < 0xe0)
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{
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/* unicode char 0x00000080 - 0x000007FF */
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c &= 0x1f;
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auxlen = 1;
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minchar = 0x00000080;
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}
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else if (c >= 0xe0 && c < 0xf0)
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{
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/* unicode char 0x00000800 - 0x0000FFFF */
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c &= 0x0f;
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auxlen = 2;
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minchar = 0x00000800;
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}
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else if (c >= 0xf0 && c < 0xf8)
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{
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/* unicode char 0x00010000 - 0x001FFFFF */
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c &= 0x07;
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auxlen = 3;
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minchar = 0x00010000;
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}
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else if (c >= 0xf8 && c < 0xfc)
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{
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/* unicode char 0x00200000 - 0x03FFFFFF */
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c &= 0x03;
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auxlen = 4;
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minchar = 0x00200000;
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}
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else if (c >= 0xfc && c < 0xfe)
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{
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/* unicode char 0x04000000 - 0x7FFFFFFF */
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c &= 0x01;
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auxlen = 5;
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minchar = 0x04000000;
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}
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else
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{
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/* invalid */
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return -1;
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}
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/* exceeds the count? */
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if (auxlen > count)
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return -1;
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/* we now know how long the char is, now compute it */
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for (i = 0; i < auxlen; i++)
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{
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auxchar = utf8char[i];
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/* all auxillary chars must be between 0x80-0xbf */
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if ((auxchar & 0xc0) != 0x80)
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return -1;
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c = c << 6;
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c |= auxchar & 0x3f;
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}
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/* make sure that this char is above the minimum */
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if (c < minchar)
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return -1;
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*uchar = c;
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return auxlen + 1;
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}
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/*-------------------------------------------------
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uchar_from_utf16 - convert a UTF-16 sequence
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into a unicode character
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-------------------------------------------------*/
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int uchar_from_utf16(unicode_char *uchar, const utf16_char *utf16char, size_t count)
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{
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int rc = -1;
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/* validate parameters */
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if (utf16char == NULL || count == 0)
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return 0;
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/* handle the two-byte case */
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if (utf16char[0] >= 0xd800 && utf16char[0] <= 0xdbff)
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{
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if (count > 1 && utf16char[1] >= 0xdc00 && utf16char[1] <= 0xdfff)
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{
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*uchar = 0x10000 + ((utf16char[0] & 0x3ff) * 0x400) + (utf16char[1] & 0x3ff);
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rc = 2;
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}
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}
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/* handle the one-byte case */
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else if (utf16char[0] < 0xdc00 || utf16char[0] > 0xdfff)
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{
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*uchar = utf16char[0];
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rc = 1;
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}
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return rc;
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}
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/*-------------------------------------------------
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uchar_from_utf16f - convert a UTF-16 sequence
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into a unicode character from a flipped
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byte order
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-------------------------------------------------*/
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int uchar_from_utf16f(unicode_char *uchar, const utf16_char *utf16char, size_t count)
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{
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utf16_char buf[2] = {0};
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if (count > 0)
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buf[0] = FLIPENDIAN_INT16(utf16char[0]);
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if (count > 1)
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buf[1] = FLIPENDIAN_INT16(utf16char[1]);
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return uchar_from_utf16(uchar, buf, count);
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}
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/*-------------------------------------------------
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utf8_from_uchar - convert a unicode character
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into a UTF-8 sequence
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-------------------------------------------------*/
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int utf8_from_uchar(char *utf8string, size_t count, unicode_char uchar)
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{
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int rc = 0;
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/* error on invalid characters */
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if (!uchar_isvalid(uchar))
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return -1;
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/* based on the value, output the appropriate number of bytes */
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if (uchar < 0x80)
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{
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/* unicode char 0x00000000 - 0x0000007F */
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if (count < 1)
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return -1;
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utf8string[rc++] = (char) uchar;
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}
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else if (uchar < 0x800)
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{
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/* unicode char 0x00000080 - 0x000007FF */
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if (count < 2)
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return -1;
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utf8string[rc++] = ((char) (uchar >> 6)) | 0xC0;
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utf8string[rc++] = ((char) ((uchar >> 0) & 0x3F)) | 0x80;
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}
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else if (uchar < 0x10000)
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{
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/* unicode char 0x00000800 - 0x0000FFFF */
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if (count < 3)
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return -1;
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utf8string[rc++] = ((char) (uchar >> 12)) | 0xE0;
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utf8string[rc++] = ((char) ((uchar >> 6) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 0) & 0x3F)) | 0x80;
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}
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else if (uchar < 0x00200000)
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{
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/* unicode char 0x00010000 - 0x001FFFFF */
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if (count < 4)
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return -1;
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utf8string[rc++] = ((char) (uchar >> 18)) | 0xF0;
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utf8string[rc++] = ((char) ((uchar >> 12) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 6) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 0) & 0x3F)) | 0x80;
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}
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else if (uchar < 0x04000000)
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{
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/* unicode char 0x00200000 - 0x03FFFFFF */
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if (count < 5)
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return -1;
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utf8string[rc++] = ((char) (uchar >> 24)) | 0xF8;
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utf8string[rc++] = ((char) ((uchar >> 18) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 12) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 6) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 0) & 0x3F)) | 0x80;
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}
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else if (uchar < 0x80000000)
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{
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/* unicode char 0x04000000 - 0x7FFFFFFF */
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if (count < 6)
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return -1;
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utf8string[rc++] = ((char) (uchar >> 30)) | 0xFC;
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utf8string[rc++] = ((char) ((uchar >> 24) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 18) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 12) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 6) & 0x3F)) | 0x80;
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utf8string[rc++] = ((char) ((uchar >> 0) & 0x3F)) | 0x80;
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}
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else
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rc = -1;
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return rc;
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}
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/*-------------------------------------------------
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utf16_from_uchar - convert a unicode character
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into a UTF-16 sequence
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-------------------------------------------------*/
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int utf16_from_uchar(utf16_char *utf16string, size_t count, unicode_char uchar)
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{
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int rc;
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/* error on invalid characters */
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if (!uchar_isvalid(uchar))
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return -1;
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/* single word case */
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if (uchar < 0x10000)
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{
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if (count < 1)
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return -1;
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utf16string[0] = (utf16_char) uchar;
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rc = 1;
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}
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/* double word case */
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else if (uchar < 0x100000)
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{
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if (count < 2)
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return -1;
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utf16string[0] = ((uchar >> 10) & 0x03ff) | 0xd800;
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utf16string[1] = ((uchar >> 0) & 0x03ff) | 0xdc00;
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rc = 2;
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}
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else
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return -1;
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return rc;
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}
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/*-------------------------------------------------
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utf16_from_uchar - convert a unicode character
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into a UTF-16 sequence with flipped endianness
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-------------------------------------------------*/
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int utf16f_from_uchar(utf16_char *utf16string, size_t count, unicode_char uchar)
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{
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int rc;
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utf16_char buf[2] = { 0, 0 };
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rc = utf16_from_uchar(buf, count, uchar);
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if (rc >= 1)
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utf16string[0] = FLIPENDIAN_INT16(buf[0]);
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if (rc >= 2)
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utf16string[1] = FLIPENDIAN_INT16(buf[1]);
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return rc;
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}
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/*-------------------------------------------------
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utf8_previous_char - return a pointer to the
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previous character in a string
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-------------------------------------------------*/
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const char *utf8_previous_char(const char *utf8string)
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{
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while ((*--utf8string & 0xc0) == 0x80)
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;
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return utf8string;
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}
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/*-------------------------------------------------
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utf8_is_valid_string - return true if the
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given string is a properly formed sequence of
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UTF-8 characters
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-------------------------------------------------*/
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int utf8_is_valid_string(const char *utf8string)
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{
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int remaining_length = strlen(utf8string);
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while (*utf8string != 0)
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{
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unicode_char uchar = 0;
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int charlen;
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/* extract the current character and verify it */
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charlen = uchar_from_utf8(&uchar, utf8string, remaining_length);
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if (charlen <= 0 || uchar == 0 || !uchar_isvalid(uchar))
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return FALSE;
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/* advance */
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utf8string += charlen;
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remaining_length -= charlen;
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}
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return TRUE;
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}
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