/src/libzip/lib/zip_utf-8.c

Source
/*
  zip_utf-8.c -- UTF-8 support functions for libzip
  Copyright (C) 2011-2024 Dieter Baron and Thomas Klausner

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

  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;
    bool can_be_ascii = true;
    bool can_be_utf8 = true;
    bool has_control_characters = false;

    if (str == NULL) {
        return ZIP_ENCODING_ASCII;
    }

    name = str->raw;

    if (str->encoding != ZIP_ENCODING_UNKNOWN) {
        return str->encoding;
    }

    for (i = 0; i < str->length; i++) {
        if (name[i] < 128) {
            if (name[i] < 32 && name[i] != '\r' && name[i] != '\n' && name[i] != '\t') {
                has_control_characters = true;
            }
            continue;
        }

        can_be_ascii = false;
        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 {
            can_be_utf8 = false;
            break;
        }

        if (i + ulen >= str->length) {
            can_be_utf8 = false;
            break;
        }

        for (j = 1; j <= ulen; j++) {
            if ((name[i + j] & UTF_8_CONTINUE_MASK) != UTF_8_CONTINUE_MATCH) {
                can_be_utf8 = false;
                goto done;
            }
        }
        i += ulen;
    }

 done:
    enc = ZIP_ENCODING_CP437;

    switch (expected_encoding) {
    case ZIP_ENCODING_UTF8_KNOWN:
    case ZIP_ENCODING_UTF8_GUESSED:
        if (can_be_utf8) {
            enc = ZIP_ENCODING_UTF8_KNOWN;
        }
        else {
            enc = ZIP_ENCODING_ERROR;
        }
        break;

    case ZIP_ENCODING_ASCII:
        if (can_be_ascii && !has_control_characters) {
            enc = ZIP_ENCODING_ASCII;
        }
        else {
            enc = ZIP_ENCODING_ERROR;
        }
        break;

    case ZIP_ENCODING_CP437:
        enc = ZIP_ENCODING_CP437;
        break;

    case ZIP_ENCODING_UNKNOWN:
        if (can_be_ascii && !has_control_characters) {
            /* only bytes from 0x20-0x7F */
            enc = ZIP_ENCODING_ASCII;
        }
        else if (can_be_ascii && has_control_characters) {
            /* only bytes from 0x00-0x7F */
            enc = ZIP_ENCODING_CP437;
        }
        else if (can_be_utf8) {
            /* contains bytes from 0x80-0xFF and is valid UTF-8 */
            enc =  ZIP_ENCODING_UTF8_GUESSED;
        }
        else {
            /* fallback */
            enc = ZIP_ENCODING_CP437;
        }
        break;
    case ZIP_ENCODING_ERROR:
        /* invalid, shouldn't happen */
        enc = ZIP_ENCODING_ERROR;
        break;
    }

    str->encoding = enc;
    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;
}

Coverage Report

Created: 2026-01-17 06:45

Line	Count	Source
1		/*
2		zip_utf-8.c -- UTF-8 support functions for libzip
3		Copyright (C) 2011-2024 Dieter Baron and Thomas Klausner
4
5		This file is part of libzip, a library to manipulate ZIP archives.
6		The authors can be contacted at <info@libzip.org>
7
8		Redistribution and use in source and binary forms, with or without
9		modification, are permitted provided that the following conditions
10		are met:
11		1. Redistributions of source code must retain the above copyright
12		notice, this list of conditions and the following disclaimer.
13		2. Redistributions in binary form must reproduce the above copyright
14		notice, this list of conditions and the following disclaimer in
15		the documentation and/or other materials provided with the
16		distribution.
17		3. The names of the authors may not be used to endorse or promote
18		products derived from this software without specific prior
19		written permission.
20
21		THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22		OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23		WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24		ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25		DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26		DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27		GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29		IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30		OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31		IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32		*/
33
34
35		#include "zipint.h"
36
37		#include <stdlib.h>
38
39
40		static const zip_uint16_t _cp437_to_unicode[256] = {
41		/* 0x00 - 0x0F */
42		0x0000, 0x263A, 0x263B, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022, 0x25D8, 0x25CB, 0x25D9, 0x2642, 0x2640, 0x266A, 0x266B, 0x263C,
43
44		/* 0x10 - 0x1F */
45		0x25BA, 0x25C4, 0x2195, 0x203C, 0x00B6, 0x00A7, 0x25AC, 0x21A8, 0x2191, 0x2193, 0x2192, 0x2190, 0x221F, 0x2194, 0x25B2, 0x25BC,
46
47		/* 0x20 - 0x2F */
48		0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
49
50		/* 0x30 - 0x3F */
51		0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
52
53		/* 0x40 - 0x4F */
54		0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
55
56		/* 0x50 - 0x5F */
57		0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
58
59		/* 0x60 - 0x6F */
60		0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
61
62		/* 0x70 - 0x7F */
63		0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x2302,
64
65		/* 0x80 - 0x8F */
66		0x00C7, 0x00FC, 0x00E9, 0x00E2, 0x00E4, 0x00E0, 0x00E5, 0x00E7, 0x00EA, 0x00EB, 0x00E8, 0x00EF, 0x00EE, 0x00EC, 0x00C4, 0x00C5,
67
68		/* 0x90 - 0x9F */
69		0x00C9, 0x00E6, 0x00C6, 0x00F4, 0x00F6, 0x00F2, 0x00FB, 0x00F9, 0x00FF, 0x00D6, 0x00DC, 0x00A2, 0x00A3, 0x00A5, 0x20A7, 0x0192,
70
71		/* 0xA0 - 0xAF */
72		0x00E1, 0x00ED, 0x00F3, 0x00FA, 0x00F1, 0x00D1, 0x00AA, 0x00BA, 0x00BF, 0x2310, 0x00AC, 0x00BD, 0x00BC, 0x00A1, 0x00AB, 0x00BB,
73
74		/* 0xB0 - 0xBF */
75		0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,
76
77		/* 0xC0 - 0xCF */
78		0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,
79
80		/* 0xD0 - 0xDF */
81		0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,
82
83		/* 0xE0 - 0xEF */
84		0x03B1, 0x00DF, 0x0393, 0x03C0, 0x03A3, 0x03C3, 0x00B5, 0x03C4, 0x03A6, 0x0398, 0x03A9, 0x03B4, 0x221E, 0x03C6, 0x03B5, 0x2229,
85
86		/* 0xF0 - 0xFF */
87		0x2261, 0x00B1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00F7, 0x2248, 0x00B0, 0x2219, 0x00B7, 0x221A, 0x207F, 0x00B2, 0x25A0, 0x00A0};
88
89	12.4k	#define UTF_8_LEN_2_MASK 0xe0
90	33.6k	#define UTF_8_LEN_2_MATCH 0xc0
91	11.0k	#define UTF_8_LEN_3_MASK 0xf0
92	46.1k	#define UTF_8_LEN_3_MATCH 0xe0
93	5.02k	#define UTF_8_LEN_4_MASK 0xf8
94	5.02k	#define UTF_8_LEN_4_MATCH 0xf0
95	6.97k	#define UTF_8_CONTINUE_MASK 0xc0
96	98.3k	#define UTF_8_CONTINUE_MATCH 0x80
97
98
99		zip_encoding_type_t
100	46.3k	_zip_guess_encoding(zip_string_t *str, zip_encoding_type_t expected_encoding) {
101	46.3k	zip_encoding_type_t enc;
102	46.3k	const zip_uint8_t *name;
103	46.3k	zip_uint32_t i, j, ulen;
104	46.3k	bool can_be_ascii = true;
105	46.3k	bool can_be_utf8 = true;
106	46.3k	bool has_control_characters = false;
107
108	46.3k	if (str == NULL) {
109	3.01k	return ZIP_ENCODING_ASCII;
110	3.01k	}
111
112	43.3k	name = str->raw;
113
114	43.3k	if (str->encoding != ZIP_ENCODING_UNKNOWN) {
115	3.01k	return str->encoding;
116	3.01k	}
117
118	506k	for (i = 0; i < str->length; i++) {
119	476k	if (name[i] < 128) {
120	463k	if (name[i] < 32 && name[i] != '\r' && name[i] != '\n' && name[i] != '\t') {
121	67.0k	has_control_characters = true;
122	67.0k	}
123	463k	continue;
124	463k	}
125
126	12.4k	can_be_ascii = false;
127	12.4k	if ((name[i] & UTF_8_LEN_2_MASK) == UTF_8_LEN_2_MATCH) {
128	1.46k	ulen = 1;
129	1.46k	}
130	11.0k	else if ((name[i] & UTF_8_LEN_3_MASK) == UTF_8_LEN_3_MATCH) {
131	5.99k	ulen = 2;
132	5.99k	}
133	5.02k	else if ((name[i] & UTF_8_LEN_4_MASK) == UTF_8_LEN_4_MATCH) {
134	1.29k	ulen = 3;
135	1.29k	}
136	3.73k	else {
137	3.73k	can_be_utf8 = false;
138	3.73k	break;
139	3.73k	}
140
141	8.75k	if (i + ulen >= str->length) {
142	4.79k	can_be_utf8 = false;
143	4.79k	break;
144	4.79k	}
145
146	9.94k	for (j = 1; j <= ulen; j++) {
147	6.97k	if ((name[i + j] & UTF_8_CONTINUE_MASK) != UTF_8_CONTINUE_MATCH) {
148	987	can_be_utf8 = false;
149	987	goto done;
150	987	}
151	6.97k	}
152	2.97k	i += ulen;
153	2.97k	}
154
155	40.3k	done:
156	40.3k	enc = ZIP_ENCODING_CP437;
157
158	40.3k	switch (expected_encoding) {
159	26.5k	case ZIP_ENCODING_UTF8_KNOWN:
160	26.5k	case ZIP_ENCODING_UTF8_GUESSED:
161	26.5k	if (can_be_utf8) {
162	19.2k	enc = ZIP_ENCODING_UTF8_KNOWN;
163	19.2k	}
164	7.34k	else {
165	7.34k	enc = ZIP_ENCODING_ERROR;
166	7.34k	}
167	26.5k	break;
168
169	0	case ZIP_ENCODING_ASCII:
170	0	if (can_be_ascii && !has_control_characters) {
171	0	enc = ZIP_ENCODING_ASCII;
172	0	}
173	0	else {
174	0	enc = ZIP_ENCODING_ERROR;
175	0	}
176	0	break;
177
178	0	case ZIP_ENCODING_CP437:
179	0	enc = ZIP_ENCODING_CP437;
180	0	break;
181
182	13.7k	case ZIP_ENCODING_UNKNOWN:
183	13.7k	if (can_be_ascii && !has_control_characters) {
184		/* only bytes from 0x20-0x7F */
185	10.8k	enc = ZIP_ENCODING_ASCII;
186	10.8k	}
187	2.95k	else if (can_be_ascii && has_control_characters) {
188		/* only bytes from 0x00-0x7F */
189	701	enc = ZIP_ENCODING_CP437;
190	701	}
191	2.25k	else if (can_be_utf8) {
192		/* contains bytes from 0x80-0xFF and is valid UTF-8 */
193	88	enc = ZIP_ENCODING_UTF8_GUESSED;
194	88	}
195	2.16k	else {
196		/* fallback */
197	2.16k	enc = ZIP_ENCODING_CP437;
198	2.16k	}
199	13.7k	break;
200	0	case ZIP_ENCODING_ERROR:
201		/* invalid, shouldn't happen */
202	0	enc = ZIP_ENCODING_ERROR;
203	0	break;
204	40.3k	}
205
206	40.3k	str->encoding = enc;
207	40.3k	return enc;
208	40.3k	}
209
210
211		static zip_uint32_t
212	175k	_zip_unicode_to_utf8_len(zip_uint32_t codepoint) {
213	175k	if (codepoint < 0x0080) {
214	119k	return 1;
215	119k	}
216	56.2k	if (codepoint < 0x0800) {
217	21.1k	return 2;
218	21.1k	}
219	35.1k	if (codepoint < 0x10000) {
220	35.1k	return 3;
221	35.1k	}
222	0	return 4;
223	35.1k	}
224
225
226		static zip_uint32_t
227	175k	_zip_unicode_to_utf8(zip_uint32_t codepoint, zip_uint8_t *buf) {
228	175k	if (codepoint < 0x0080) {
229	119k	buf[0] = codepoint & 0xff;
230	119k	return 1;
231	119k	}
232	56.2k	if (codepoint < 0x0800) {
233	21.1k	buf[0] = (zip_uint8_t)(UTF_8_LEN_2_MATCH \| ((codepoint >> 6) & 0x1f));
234	21.1k	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
235	21.1k	return 2;
236	21.1k	}
237	35.1k	if (codepoint < 0x10000) {
238	35.1k	buf[0] = (zip_uint8_t)(UTF_8_LEN_3_MATCH \| ((codepoint >> 12) & 0x0f));
239	35.1k	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
240	35.1k	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
241	35.1k	return 3;
242	35.1k	}
243	0	buf[0] = (zip_uint8_t)(UTF_8_LEN_4_MATCH \| ((codepoint >> 18) & 0x07));
244	0	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 12) & 0x3f));
245	0	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
246	0	buf[3] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
247	0	return 4;
248	35.1k	}
249
250
251		zip_uint8_t *
252	2.87k	_zip_cp437_to_utf8(const zip_uint8_t const _cp437buf, zip_uint32_t len, zip_uint32_t utf8_lenp, zip_error_t *error) {
253	2.87k	zip_uint8_t cp437buf = (zip_uint8_t )_cp437buf;
254	2.87k	zip_uint8_t *utf8buf;
255	2.87k	zip_uint32_t buflen, i, offset;
256
257	2.87k	if (len == 0) {
258	0	if (utf8_lenp) {
259	0	*utf8_lenp = 0;
260	0	}
261	0	return NULL;
262	0	}
263
264	2.87k	buflen = 1;
265	178k	for (i = 0; i < len; i++) {
266	175k	buflen += _zip_unicode_to_utf8_len(_cp437_to_unicode[cp437buf[i]]);
267	175k	}
268
269	2.87k	if ((utf8buf = (zip_uint8_t *)malloc(buflen)) == NULL) {
270	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
271	0	return NULL;
272	0	}
273
274	2.87k	offset = 0;
275	178k	for (i = 0; i < len; i++) {
276	175k	offset += _zip_unicode_to_utf8(_cp437_to_unicode[cp437buf[i]], utf8buf + offset);
277	175k	}
278
279	2.87k	utf8buf[buflen - 1] = 0;
280	2.87k	if (utf8_lenp) {
281	2.87k	*utf8_lenp = buflen - 1;
282	2.87k	}
283	2.87k	return utf8buf;
284	2.87k	}