SharpMuPDF/mupdf/source/fitz/encodings.c

// Copyright (C) 2004-2021 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.

#include "mupdf/fitz.h"
#include "mupdf/pdf.h"

#include <string.h>
#include <stdlib.h>

#include "encodings.h"
#include "glyphlist.h"
#include "smallcaps.h"

#define FROM_UNICODE(ENC) \
	int l = 0; \
	int r = nelem(ENC##_from_unicode) - 1; \
	if (u < 128) \
		return u; \
	while (l <= r) \
	{ \
		int m = (l + r) >> 1; \
		if (u < ENC##_from_unicode[m].u) \
			r = m - 1; \
		else if (u > ENC##_from_unicode[m].u) \
			l = m + 1; \
		else \
			return ENC##_from_unicode[m].c; \
	} \
	return -1; \

int fz_iso8859_1_from_unicode(int u) { FROM_UNICODE(iso8859_1) }
int fz_iso8859_7_from_unicode(int u) { FROM_UNICODE(iso8859_7) }
int fz_koi8u_from_unicode(int u) { FROM_UNICODE(koi8u) }
int fz_windows_1250_from_unicode(int u) { FROM_UNICODE(windows_1250) }
int fz_windows_1251_from_unicode(int u) { FROM_UNICODE(windows_1251) }
int fz_windows_1252_from_unicode(int u) { FROM_UNICODE(windows_1252) }

int
fz_unicode_from_glyph_name_strict(const char *name)
{
	int l = 0;
	int r = nelem(single_name_list) - 1;

	while (l <= r)
	{
		int m = (l + r) >> 1;
		int c = strcmp(name, single_name_list[m]);
		if (c < 0)
			r = m - 1;
		else if (c > 0)
			l = m + 1;
		else
			return single_code_list[m];
	}
	return 0;
}

static int
read_num(const char *p, int base)
{
	char *e;
	int v = strtol(p, &e, base);
	if (*e != 0)
		return 0;
	return v;
}

int
fz_unicode_from_glyph_name(const char *name)
{
	char buf[64];
	char *p;
	int l = 0;
	int r = nelem(single_name_list) - 1;
	int code = 0;

	fz_strlcpy(buf, name, sizeof buf);

	/* kill anything after first period and underscore */
	p = strchr(buf, '.');
	if (p) p[0] = 0;
	p = strchr(buf, '_');
	if (p)
	{
		/* Hacky tests for alternative ligature names */
		if (buf[0] == 'f')
		{
			if (!strcmp(buf, "f_f"))
				strcpy(buf, "ff");
			else if (!strcmp(buf, "f_f_i"))
				strcpy(buf, "ffi");
			else if (!strcmp(buf, "f_f_l"))
				strcpy(buf, "ffl");
			else if (!strcmp(buf, "f_i"))
				strcpy(buf, "fi");
			else if (!strcmp(buf, "f_l"))
				strcpy(buf, "fl");
			else
				p[0] = 0;
		}
		else
			p[0] = 0;
	}

	while (l <= r)
	{
		int m = (l + r) >> 1;
		int c = strcmp(buf, single_name_list[m]);
		if (c < 0)
			r = m - 1;
		else if (c > 0)
			l = m + 1;
		else
			return single_code_list[m];
	}

	if (buf[0] == 'u' && buf[1] == 'n' && buf[2] == 'i' && strlen(buf) == 7)
		code = read_num(buf+3, 16);
	else if (buf[0] == 'u')
		code = read_num(buf+1, 16);
	else if (buf[0] == 'a' && buf[1] != 0 && buf[2] != 0)
		code = read_num(buf+1, 10);
	else
		code = read_num(buf, 10);

	return (code > 0 && code <= 0x10ffff) ? code : FZ_REPLACEMENT_CHARACTER;
}

static const char *empty_dup_list[] = { 0 };

const char **
fz_duplicate_glyph_names_from_unicode(int ucs)
{
	int l = 0;
	int r = nelem(agl_dup_offsets) / 2 - 1;
	while (l <= r)
	{
		int m = (l + r) >> 1;
		if (ucs < agl_dup_offsets[m << 1])
			r = m - 1;
		else if (ucs > agl_dup_offsets[m << 1])
			l = m + 1;
		else
			return agl_dup_names + agl_dup_offsets[(m << 1) + 1];
	}
	return empty_dup_list;
}

const char *
fz_glyph_name_from_unicode_sc(int u)
{
	int l = 0;
	int r = nelem(glyph_name_from_unicode_sc) / 2 - 1;
	while (l <= r)
	{
		int m = (l + r) >> 1;
		if (u < glyph_name_from_unicode_sc[m].u)
			r = m - 1;
		else if (u > glyph_name_from_unicode_sc[m].u)
			l = m + 1;
		else
			return glyph_name_from_unicode_sc[m].n;
	}
	return NULL;
}