lib/zip_utf-8.c - third_party/libzip - Git at Google

 /*
   zip_utf-8.c -- UTF-8 support functions for libzip
   Copyright (C) 2011-2021 Dieter Baron and Thomas Klausner

   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.
   3. The names of the authors may not be used to endorse or promote
      products derived from this software without specific prior
      written permission.

   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


 #include "zipint.h"

 #include <stdlib.h>


 static const zip_uint16_t _cp437_to_unicode[256] = {
     /* 0x00 - 0x0F */
     0x0000, 0x263A, 0x263B, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022, 0x25D8, 0x25CB, 0x25D9, 0x2642, 0x2640, 0x266A, 0x266B, 0x263C,

     /* 0x10 - 0x1F */
     0x25BA, 0x25C4, 0x2195, 0x203C, 0x00B6, 0x00A7, 0x25AC, 0x21A8, 0x2191, 0x2193, 0x2192, 0x2190, 0x221F, 0x2194, 0x25B2, 0x25BC,

     /* 0x20 - 0x2F */
     0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,

     /* 0x30 - 0x3F */
     0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,

     /* 0x40 - 0x4F */
     0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,

     /* 0x50 - 0x5F */
     0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,

     /* 0x60 - 0x6F */
     0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,

     /* 0x70 - 0x7F */
     0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x2302,

     /* 0x80 - 0x8F */
     0x00C7, 0x00FC, 0x00E9, 0x00E2, 0x00E4, 0x00E0, 0x00E5, 0x00E7, 0x00EA, 0x00EB, 0x00E8, 0x00EF, 0x00EE, 0x00EC, 0x00C4, 0x00C5,

     /* 0x90 - 0x9F */
     0x00C9, 0x00E6, 0x00C6, 0x00F4, 0x00F6, 0x00F2, 0x00FB, 0x00F9, 0x00FF, 0x00D6, 0x00DC, 0x00A2, 0x00A3, 0x00A5, 0x20A7, 0x0192,

     /* 0xA0 - 0xAF */
     0x00E1, 0x00ED, 0x00F3, 0x00FA, 0x00F1, 0x00D1, 0x00AA, 0x00BA, 0x00BF, 0x2310, 0x00AC, 0x00BD, 0x00BC, 0x00A1, 0x00AB, 0x00BB,

     /* 0xB0 - 0xBF */
     0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,

     /* 0xC0 - 0xCF */
     0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,

     /* 0xD0 - 0xDF */
     0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,

     /* 0xE0 - 0xEF */
     0x03B1, 0x00DF, 0x0393, 0x03C0, 0x03A3, 0x03C3, 0x00B5, 0x03C4, 0x03A6, 0x0398, 0x03A9, 0x03B4, 0x221E, 0x03C6, 0x03B5, 0x2229,

     /* 0xF0 - 0xFF */
     0x2261, 0x00B1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00F7, 0x2248, 0x00B0, 0x2219, 0x00B7, 0x221A, 0x207F, 0x00B2, 0x25A0, 0x00A0};

 #define UTF_8_LEN_2_MASK 0xe0
 #define UTF_8_LEN_2_MATCH 0xc0
 #define UTF_8_LEN_3_MASK 0xf0
 #define UTF_8_LEN_3_MATCH 0xe0
 #define UTF_8_LEN_4_MASK 0xf8
 #define UTF_8_LEN_4_MATCH 0xf0
 #define UTF_8_CONTINUE_MASK 0xc0
 #define UTF_8_CONTINUE_MATCH 0x80


 zip_encoding_type_t
 _zip_guess_encoding(zip_string_t *str, zip_encoding_type_t expected_encoding) {
     zip_encoding_type_t enc;
     const zip_uint8_t *name;
     zip_uint32_t i, j, ulen;

     if (str == NULL)
         return ZIP_ENCODING_ASCII;

     name = str->raw;

     if (str->encoding != ZIP_ENCODING_UNKNOWN)
         enc = str->encoding;
     else {
         enc = ZIP_ENCODING_ASCII;
         for (i = 0; i < str->length; i++) {
             if ((name[i] > 31 && name[i] < 128) || name[i] == '\r' || name[i] == '\n' || name[i] == '\t')
                 continue;

             enc = ZIP_ENCODING_UTF8_GUESSED;
             if ((name[i] & UTF_8_LEN_2_MASK) == UTF_8_LEN_2_MATCH)
                 ulen = 1;
             else if ((name[i] & UTF_8_LEN_3_MASK) == UTF_8_LEN_3_MATCH)
                 ulen = 2;
             else if ((name[i] & UTF_8_LEN_4_MASK) == UTF_8_LEN_4_MATCH)
                 ulen = 3;
             else {
                 enc = ZIP_ENCODING_CP437;
                 break;
             }

             if (i + ulen >= str->length) {
                 enc = ZIP_ENCODING_CP437;
                 break;
             }

             for (j = 1; j <= ulen; j++) {
                 if ((name[i + j] & UTF_8_CONTINUE_MASK) != UTF_8_CONTINUE_MATCH) {
                     enc = ZIP_ENCODING_CP437;
                     goto done;
                 }
             }
             i += ulen;
         }
     }

 done:
     str->encoding = enc;

     if (expected_encoding != ZIP_ENCODING_UNKNOWN) {
         if (expected_encoding == ZIP_ENCODING_UTF8_KNOWN && enc == ZIP_ENCODING_UTF8_GUESSED)
             str->encoding = enc = ZIP_ENCODING_UTF8_KNOWN;

         if (expected_encoding != enc && enc != ZIP_ENCODING_ASCII)
             return ZIP_ENCODING_ERROR;
     }

     return enc;
 }


 static zip_uint32_t
 _zip_unicode_to_utf8_len(zip_uint32_t codepoint) {
     if (codepoint < 0x0080)
         return 1;
     if (codepoint < 0x0800)
         return 2;
     if (codepoint < 0x10000)
         return 3;
     return 4;
 }


 static zip_uint32_t
 _zip_unicode_to_utf8(zip_uint32_t codepoint, zip_uint8_t *buf) {
     if (codepoint < 0x0080) {
         buf[0] = codepoint & 0xff;
         return 1;
     }
     if (codepoint < 0x0800) {
         buf[0] = (zip_uint8_t)(UTF_8_LEN_2_MATCH | ((codepoint >> 6) & 0x1f));
         buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH | (codepoint & 0x3f));
         return 2;
     }
     if (codepoint < 0x10000) {
         buf[0] = (zip_uint8_t)(UTF_8_LEN_3_MATCH | ((codepoint >> 12) & 0x0f));
         buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH | ((codepoint >> 6) & 0x3f));
         buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH | (codepoint & 0x3f));
         return 3;
     }
     buf[0] = (zip_uint8_t)(UTF_8_LEN_4_MATCH | ((codepoint >> 18) & 0x07));
     buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH | ((codepoint >> 12) & 0x3f));
     buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH | ((codepoint >> 6) & 0x3f));
     buf[3] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH | (codepoint & 0x3f));
     return 4;
 }


 zip_uint8_t *
 _zip_cp437_to_utf8(const zip_uint8_t *const _cp437buf, zip_uint32_t len, zip_uint32_t *utf8_lenp, zip_error_t *error) {
     zip_uint8_t *cp437buf = (zip_uint8_t *)_cp437buf;
     zip_uint8_t *utf8buf;
     zip_uint32_t buflen, i, offset;

     if (len == 0) {
         if (utf8_lenp)
             *utf8_lenp = 0;
         return NULL;
     }

     buflen = 1;
     for (i = 0; i < len; i++)
         buflen += _zip_unicode_to_utf8_len(_cp437_to_unicode[cp437buf[i]]);

     if ((utf8buf = (zip_uint8_t *)malloc(buflen)) == NULL) {
         zip_error_set(error, ZIP_ER_MEMORY, 0);
         return NULL;
     }

     offset = 0;
     for (i = 0; i < len; i++)
         offset += _zip_unicode_to_utf8(_cp437_to_unicode[cp437buf[i]], utf8buf + offset);

     utf8buf[buflen - 1] = 0;
     if (utf8_lenp)
         *utf8_lenp = buflen - 1;
     return utf8buf;
 }
	/*
	zip_utf-8.c -- UTF-8 support functions for libzip
	Copyright (C) 2011-2021 Dieter Baron and Thomas Klausner

	This file is part of libzip, a library to manipulate ZIP archives.
	The authors can be contacted at <libzip@nih.at>

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions
	are met:
	1. Redistributions of source code must retain the above copyright
	notice, this list of conditions and the following disclaimer.
	2. Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in
	the documentation and/or other materials provided with the
	distribution.
	3. The names of the authors may not be used to endorse or promote
	products derived from this software without specific prior
	written permission.

	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/


	#include "zipint.h"

	#include <stdlib.h>


	static const zip_uint16_t _cp437_to_unicode[256] = {
	/* 0x00 - 0x0F */
	0x0000, 0x263A, 0x263B, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022, 0x25D8, 0x25CB, 0x25D9, 0x2642, 0x2640, 0x266A, 0x266B, 0x263C,

	/* 0x10 - 0x1F */
	0x25BA, 0x25C4, 0x2195, 0x203C, 0x00B6, 0x00A7, 0x25AC, 0x21A8, 0x2191, 0x2193, 0x2192, 0x2190, 0x221F, 0x2194, 0x25B2, 0x25BC,

	/* 0x20 - 0x2F */
	0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,

	/* 0x30 - 0x3F */
	0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,

	/* 0x40 - 0x4F */
	0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,

	/* 0x50 - 0x5F */
	0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,

	/* 0x60 - 0x6F */
	0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,

	/* 0x70 - 0x7F */
	0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x2302,

	/* 0x80 - 0x8F */
	0x00C7, 0x00FC, 0x00E9, 0x00E2, 0x00E4, 0x00E0, 0x00E5, 0x00E7, 0x00EA, 0x00EB, 0x00E8, 0x00EF, 0x00EE, 0x00EC, 0x00C4, 0x00C5,

	/* 0x90 - 0x9F */
	0x00C9, 0x00E6, 0x00C6, 0x00F4, 0x00F6, 0x00F2, 0x00FB, 0x00F9, 0x00FF, 0x00D6, 0x00DC, 0x00A2, 0x00A3, 0x00A5, 0x20A7, 0x0192,

	/* 0xA0 - 0xAF */
	0x00E1, 0x00ED, 0x00F3, 0x00FA, 0x00F1, 0x00D1, 0x00AA, 0x00BA, 0x00BF, 0x2310, 0x00AC, 0x00BD, 0x00BC, 0x00A1, 0x00AB, 0x00BB,

	/* 0xB0 - 0xBF */
	0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,

	/* 0xC0 - 0xCF */
	0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,

	/* 0xD0 - 0xDF */
	0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,

	/* 0xE0 - 0xEF */
	0x03B1, 0x00DF, 0x0393, 0x03C0, 0x03A3, 0x03C3, 0x00B5, 0x03C4, 0x03A6, 0x0398, 0x03A9, 0x03B4, 0x221E, 0x03C6, 0x03B5, 0x2229,

	/* 0xF0 - 0xFF */
	0x2261, 0x00B1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00F7, 0x2248, 0x00B0, 0x2219, 0x00B7, 0x221A, 0x207F, 0x00B2, 0x25A0, 0x00A0};

	#define UTF_8_LEN_2_MASK 0xe0
	#define UTF_8_LEN_2_MATCH 0xc0
	#define UTF_8_LEN_3_MASK 0xf0
	#define UTF_8_LEN_3_MATCH 0xe0
	#define UTF_8_LEN_4_MASK 0xf8
	#define UTF_8_LEN_4_MATCH 0xf0
	#define UTF_8_CONTINUE_MASK 0xc0
	#define UTF_8_CONTINUE_MATCH 0x80


	zip_encoding_type_t
	_zip_guess_encoding(zip_string_t *str, zip_encoding_type_t expected_encoding) {
	zip_encoding_type_t enc;
	const zip_uint8_t *name;
	zip_uint32_t i, j, ulen;

	if (str == NULL)
	return ZIP_ENCODING_ASCII;

	name = str->raw;

	if (str->encoding != ZIP_ENCODING_UNKNOWN)
	enc = str->encoding;
	else {
	enc = ZIP_ENCODING_ASCII;
	for (i = 0; i < str->length; i++) {
	if ((name[i] > 31 && name[i] < 128) \|\| name[i] == '\r' \|\| name[i] == '\n' \|\| name[i] == '\t')
	continue;

	enc = ZIP_ENCODING_UTF8_GUESSED;
	if ((name[i] & UTF_8_LEN_2_MASK) == UTF_8_LEN_2_MATCH)
	ulen = 1;
	else if ((name[i] & UTF_8_LEN_3_MASK) == UTF_8_LEN_3_MATCH)
	ulen = 2;
	else if ((name[i] & UTF_8_LEN_4_MASK) == UTF_8_LEN_4_MATCH)
	ulen = 3;
	else {
	enc = ZIP_ENCODING_CP437;
	break;
	}

	if (i + ulen >= str->length) {
	enc = ZIP_ENCODING_CP437;
	break;
	}

	for (j = 1; j <= ulen; j++) {
	if ((name[i + j] & UTF_8_CONTINUE_MASK) != UTF_8_CONTINUE_MATCH) {
	enc = ZIP_ENCODING_CP437;
	goto done;
	}
	}
	i += ulen;
	}
	}

	done:
	str->encoding = enc;

	if (expected_encoding != ZIP_ENCODING_UNKNOWN) {
	if (expected_encoding == ZIP_ENCODING_UTF8_KNOWN && enc == ZIP_ENCODING_UTF8_GUESSED)
	str->encoding = enc = ZIP_ENCODING_UTF8_KNOWN;

	if (expected_encoding != enc && enc != ZIP_ENCODING_ASCII)
	return ZIP_ENCODING_ERROR;
	}

	return enc;
	}


	static zip_uint32_t
	_zip_unicode_to_utf8_len(zip_uint32_t codepoint) {
	if (codepoint < 0x0080)
	return 1;
	if (codepoint < 0x0800)
	return 2;
	if (codepoint < 0x10000)
	return 3;
	return 4;
	}


	static zip_uint32_t
	_zip_unicode_to_utf8(zip_uint32_t codepoint, zip_uint8_t *buf) {
	if (codepoint < 0x0080) {
	buf[0] = codepoint & 0xff;
	return 1;
	}
	if (codepoint < 0x0800) {
	buf[0] = (zip_uint8_t)(UTF_8_LEN_2_MATCH \| ((codepoint >> 6) & 0x1f));
	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
	return 2;
	}
	if (codepoint < 0x10000) {
	buf[0] = (zip_uint8_t)(UTF_8_LEN_3_MATCH \| ((codepoint >> 12) & 0x0f));
	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
	return 3;
	}
	buf[0] = (zip_uint8_t)(UTF_8_LEN_4_MATCH \| ((codepoint >> 18) & 0x07));
	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 12) & 0x3f));
	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
	buf[3] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
	return 4;
	}


	zip_uint8_t *
	_zip_cp437_to_utf8(const zip_uint8_t const _cp437buf, zip_uint32_t len, zip_uint32_t utf8_lenp, zip_error_t *error) {
	zip_uint8_t cp437buf = (zip_uint8_t )_cp437buf;
	zip_uint8_t *utf8buf;
	zip_uint32_t buflen, i, offset;

	if (len == 0) {
	if (utf8_lenp)
	*utf8_lenp = 0;
	return NULL;
	}

	buflen = 1;
	for (i = 0; i < len; i++)
	buflen += _zip_unicode_to_utf8_len(_cp437_to_unicode[cp437buf[i]]);

	if ((utf8buf = (zip_uint8_t *)malloc(buflen)) == NULL) {
	zip_error_set(error, ZIP_ER_MEMORY, 0);
	return NULL;
	}

	offset = 0;
	for (i = 0; i < len; i++)
	offset += _zip_unicode_to_utf8(_cp437_to_unicode[cp437buf[i]], utf8buf + offset);

	utf8buf[buflen - 1] = 0;
	if (utf8_lenp)
	*utf8_lenp = buflen - 1;
	return utf8buf;
	}