int mbfl_filt_conv_wchar_utf7()

in libmbfl/filters/mbfilter_utf7.c [247:374]


int mbfl_filt_conv_wchar_utf7(int c, mbfl_convert_filter *filter)
{
	int s, n;

	n = 0;
	if (c >= 0 && c < 0x80) {	/* ASCII */
		if (c >= 0x41 && c <= 0x5a) {		/* A - Z */
			n = 1;
		} else if (c >= 0x61 && c <= 0x7a) {	/* a - z */
			n = 1;
		} else if (c >= 0x30 && c <= 0x39) {	/* 0 - 9 */
			n = 1;
		} else if (c == '\0') {			/* '\0' */
			n = 1;
		} else if (c == 0x2f) {			/* '/' */
			n = 1;
		} else if (c == 0x2d) {			/* '-' */
			n = 1;
		} else if (c == 0x20) {			/* SPACE */
			n = 2;
		} else if (c == 0x09) {			/* HTAB */
			n = 2;
		} else if (c == 0x0d) {			/* CR */
			n = 2;
		} else if (c == 0x0a) {			/* LF */
			n = 2;
		} else if (c == 0x27) {			/* "'" */
			n = 2;
		} else if (c == 0x28) {			/* '(' */
			n = 2;
		} else if (c == 0x29) {			/* ')' */
			n = 2;
		} else if (c == 0x2c) {			/* ',' */
			n = 2;
		} else if (c == 0x2e) {			/* '.' */
			n = 2;
		} else if (c == 0x3a) {			/* ':' */
			n = 2;
		} else if (c == 0x3f) {			/* '?' */
			n = 2;
		}
	} else if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
		;
	} else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
		s = ((c >> 10) - 0x40) | 0xd800;
		CK((*filter->filter_function)(s, filter));
		s = (c & 0x3ff) | 0xdc00;
		CK((*filter->filter_function)(s, filter));
		return c;
	} else {
		if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
			CK(mbfl_filt_conv_illegal_output(c, filter));
		}
		return c;
	}

	switch (filter->status) {
	case 0:
		if (n != 0) {	/* directly encode characters */
			CK((*filter->output_function)(c, filter->data));
		} else {	/* Modified Base64 */
			CK((*filter->output_function)(0x2b, filter->data));		/* '+' */
			filter->status++;
			filter->cache = c;
		}
		break;

	/* encode Modified Base64 */
	case 1:
		s = filter->cache;
		CK((*filter->output_function)(mbfl_base64_table[(s >> 10) & 0x3f], filter->data));
		CK((*filter->output_function)(mbfl_base64_table[(s >> 4) & 0x3f], filter->data));
		if (n != 0) {
			CK((*filter->output_function)(mbfl_base64_table[(s << 2) & 0x3c], filter->data));
			if (n == 1) {
				CK((*filter->output_function)(0x2d, filter->data));		/* '-' */
			}
			CK((*filter->output_function)(c, filter->data));
			filter->status = 0;
		} else {
			filter->status++;
			filter->cache = ((s & 0xf) << 16) | c;
		}
		break;

	case 2:
		s = filter->cache;
		CK((*filter->output_function)(mbfl_base64_table[(s >> 14) & 0x3f], filter->data));
		CK((*filter->output_function)(mbfl_base64_table[(s >> 8) & 0x3f], filter->data));
		CK((*filter->output_function)(mbfl_base64_table[(s >> 2) & 0x3f], filter->data));
		if (n != 0) {
			CK((*filter->output_function)(mbfl_base64_table[(s << 4) & 0x30], filter->data));
			if (n == 1) {
				CK((*filter->output_function)(0x2d, filter->data));		/* '-' */
			}
			CK((*filter->output_function)(c, filter->data));
			filter->status = 0;
		} else {
			filter->status++;
			filter->cache = ((s & 0x3) << 16) | c;
		}
		break;

	case 3:
		s = filter->cache;
		CK((*filter->output_function)(mbfl_base64_table[(s >> 12) & 0x3f], filter->data));
		CK((*filter->output_function)(mbfl_base64_table[(s >> 6) & 0x3f], filter->data));
		CK((*filter->output_function)(mbfl_base64_table[s & 0x3f], filter->data));
		if (n != 0) {
			if (n == 1) {
				CK((*filter->output_function)(0x2d, filter->data));		/* '-' */
			}
			CK((*filter->output_function)(c, filter->data));
			filter->status = 0;
		} else {
			filter->status = 1;
			filter->cache = c;
		}
		break;

	default:
		filter->status = 0;
		break;
	}

	return c;

}