/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
#define UTF_8_CONTINUE_VALUE_MASK 0x3f

/* smallest code point that has to be encoded with a sequence of the given length, indexed by number of continuation bytes */
static const zip_uint32_t _utf8_minimum_code_point[4] = {0, 0x80, 0x800, 0x10000};


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, codepoint;
    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;
            codepoint = name[i] & ~UTF_8_LEN_2_MASK;
        }
        else if ((name[i] & UTF_8_LEN_3_MASK) == UTF_8_LEN_3_MATCH) {
            ulen = 2;
            codepoint = name[i] & ~UTF_8_LEN_3_MASK;
        }
        else if ((name[i] & UTF_8_LEN_4_MASK) == UTF_8_LEN_4_MATCH) {
            ulen = 3;
            codepoint = name[i] & ~UTF_8_LEN_4_MASK;
        }
        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;
            }
            codepoint = (codepoint << 6) | (name[i + j] & UTF_8_CONTINUE_VALUE_MASK);
        }

        /* reject overlong encodings, surrogate halves, and code points above U+10FFFF */
        if (codepoint < _utf8_minimum_code_point[ulen] || (codepoint >= 0xd800 && codepoint <= 0xdfff) || codepoint > 0x10ffff) {
            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: 2026-10-14 06:52

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	877	#define UTF_8_LEN_2_MASK 0xe0
90	1.64k	#define UTF_8_LEN_2_MATCH 0xc0
91	736	#define UTF_8_LEN_3_MASK 0xf0
92	1.84k	#define UTF_8_LEN_3_MATCH 0xe0
93	534	#define UTF_8_LEN_4_MASK 0xf8
94	358	#define UTF_8_LEN_4_MATCH 0xf0
95	951	#define UTF_8_CONTINUE_MASK 0xc0
96	4.48k	#define UTF_8_CONTINUE_MATCH 0x80
97	843	#define UTF_8_CONTINUE_VALUE_MASK 0x3f
98
99		/* smallest code point that has to be encoded with a sequence of the given length, indexed by number of continuation bytes */
100		static const zip_uint32_t _utf8_minimum_code_point[4] = {0, 0x80, 0x800, 0x10000};
101
102
103	64.0k	zip_encoding_type_t _zip_guess_encoding(zip_string_t *str, zip_encoding_type_t expected_encoding) {
104	64.0k	zip_encoding_type_t enc;
105	64.0k	const zip_uint8_t *name;
106	64.0k	zip_uint32_t i, j, ulen, codepoint;
107	64.0k	bool can_be_ascii = true;
108	64.0k	bool can_be_utf8 = true;
109	64.0k	bool has_control_characters = false;
110
111	64.0k	if (str == NULL) {
112	0	return ZIP_ENCODING_ASCII;
113	0	}
114
115	64.0k	name = str->raw;
116
117	64.0k	if (str->encoding != ZIP_ENCODING_UNKNOWN) {
118	0	return str->encoding;
119	0	}
120
121	1.36M	for (i = 0; i < str->length; i++) {
122	1.30M	if (name[i] < 128) {
123	1.30M	if (name[i] < 32 && name[i] != '\r' && name[i] != '\n' && name[i] != '\t') {
124	5.84k	has_control_characters = true;
125	5.84k	}
126	1.30M	continue;
127	1.30M	}
128
129	712	can_be_ascii = false;
130	712	if ((name[i] & UTF_8_LEN_2_MASK) == UTF_8_LEN_2_MATCH) {
131	165	ulen = 1;
132	165	codepoint = name[i] & ~UTF_8_LEN_2_MASK;
133	165	}
134	547	else if ((name[i] & UTF_8_LEN_3_MASK) == UTF_8_LEN_3_MATCH) {
135	189	ulen = 2;
136	189	codepoint = name[i] & ~UTF_8_LEN_3_MASK;
137	189	}
138	358	else if ((name[i] & UTF_8_LEN_4_MASK) == UTF_8_LEN_4_MATCH) {
139	176	ulen = 3;
140	176	codepoint = name[i] & ~UTF_8_LEN_4_MASK;
141	176	}
142	182	else {
143	182	can_be_utf8 = false;
144	182	break;
145	182	}
146
147	530	if (i + ulen >= str->length) {
148	24	can_be_utf8 = false;
149	24	break;
150	24	}
151
152	1.34k	for (j = 1; j <= ulen; j++) {
153	951	if ((name[i + j] & UTF_8_CONTINUE_MASK) != UTF_8_CONTINUE_MATCH) {
154	108	can_be_utf8 = false;
155	108	goto done;
156	108	}
157	843	codepoint = (codepoint << 6) \| (name[i + j] & UTF_8_CONTINUE_VALUE_MASK);
158	843	}
159
160		/* reject overlong encodings, surrogate halves, and code points above U+10FFFF */
161	398	if (codepoint < _utf8_minimum_code_point[ulen] \|\| (codepoint >= 0xd800 && codepoint <= 0xdfff) \|\| codepoint > 0x10ffff) {
162	45	can_be_utf8 = false;
163	45	goto done;
164	45	}
165	353	i += ulen;
166	353	}
167
168	64.0k	done:
169	64.0k	enc = ZIP_ENCODING_CP437;
170
171	64.0k	switch (expected_encoding) {
172	26.5k	case ZIP_ENCODING_UTF8_KNOWN:
173	26.5k	case ZIP_ENCODING_UTF8_GUESSED:
174	26.5k	if (can_be_utf8) {
175	26.3k	enc = ZIP_ENCODING_UTF8_KNOWN;
176	26.3k	}
177	208	else {
178	208	enc = ZIP_ENCODING_ERROR;
179	208	}
180	26.5k	break;
181
182	0	case ZIP_ENCODING_ASCII:
183	0	if (can_be_ascii && !has_control_characters) {
184	0	enc = ZIP_ENCODING_ASCII;
185	0	}
186	0	else {
187	0	enc = ZIP_ENCODING_ERROR;
188	0	}
189	0	break;
190
191	0	case ZIP_ENCODING_CP437:
192	0	enc = ZIP_ENCODING_CP437;
193	0	break;
194
195	37.5k	case ZIP_ENCODING_UNKNOWN:
196	37.5k	if (can_be_ascii && !has_control_characters) {
197		/* only bytes from 0x20-0x7F */
198	37.2k	enc = ZIP_ENCODING_ASCII;
199	37.2k	}
200	226	else if (can_be_ascii && has_control_characters) {
201		/* only bytes from 0x00-0x7F */
202	64	enc = ZIP_ENCODING_CP437;
203	64	}
204	162	else if (can_be_utf8) {
205		/* contains bytes from 0x80-0xFF and is valid UTF-8 */
206	11	enc = ZIP_ENCODING_UTF8_GUESSED;
207	11	}
208	151	else {
209		/* fallback */
210	151	enc = ZIP_ENCODING_CP437;
211	151	}
212	37.5k	break;
213	0	case ZIP_ENCODING_ERROR:
214		/* invalid, shouldn't happen */
215	0	enc = ZIP_ENCODING_ERROR;
216	0	break;
217	64.0k	}
218
219	64.0k	str->encoding = enc;
220	64.0k	return enc;
221	64.0k	}
222
223
224	3.57k	static zip_uint32_t _zip_unicode_to_utf8_len(zip_uint32_t codepoint) {
225	3.57k	if (codepoint < 0x0080) {
226	1.34k	return 1;
227	1.34k	}
228	2.23k	if (codepoint < 0x0800) {
229	932	return 2;
230	932	}
231	1.30k	if (codepoint < 0x10000) {
232	1.30k	return 3;
233	1.30k	}
234	0	return 4;
235	1.30k	}
236
237
238	3.57k	static zip_uint32_t _zip_unicode_to_utf8(zip_uint32_t codepoint, zip_uint8_t *buf) {
239	3.57k	if (codepoint < 0x0080) {
240	1.34k	buf[0] = codepoint & 0xff;
241	1.34k	return 1;
242	1.34k	}
243	2.23k	if (codepoint < 0x0800) {
244	932	buf[0] = (zip_uint8_t)(UTF_8_LEN_2_MATCH \| ((codepoint >> 6) & 0x1f));
245	932	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
246	932	return 2;
247	932	}
248	1.30k	if (codepoint < 0x10000) {
249	1.30k	buf[0] = (zip_uint8_t)(UTF_8_LEN_3_MATCH \| ((codepoint >> 12) & 0x0f));
250	1.30k	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
251	1.30k	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
252	1.30k	return 3;
253	1.30k	}
254	0	buf[0] = (zip_uint8_t)(UTF_8_LEN_4_MATCH \| ((codepoint >> 18) & 0x07));
255	0	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 12) & 0x3f));
256	0	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
257	0	buf[3] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
258	0	return 4;
259	1.30k	}
260
261
262	215	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) {
263	215	zip_uint8_t cp437buf = (zip_uint8_t )_cp437buf;
264	215	zip_uint8_t *utf8buf;
265	215	zip_uint32_t buflen, i, offset;
266
267	215	if (len == 0) {
268	0	if (utf8_lenp) {
269	0	*utf8_lenp = 0;
270	0	}
271	0	return NULL;
272	0	}
273
274	215	buflen = 1;
275	3.79k	for (i = 0; i < len; i++) {
276	3.57k	buflen += _zip_unicode_to_utf8_len(_cp437_to_unicode[cp437buf[i]]);
277	3.57k	}
278
279	215	if ((utf8buf = (zip_uint8_t *)malloc(buflen)) == NULL) {
280	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
281	0	return NULL;
282	0	}
283
284	215	offset = 0;
285	3.79k	for (i = 0; i < len; i++) {
286	3.57k	offset += _zip_unicode_to_utf8(_cp437_to_unicode[cp437buf[i]], utf8buf + offset);
287	3.57k	}
288
289	215	utf8buf[buflen - 1] = 0;
290	215	if (utf8_lenp) {
291	215	*utf8_lenp = buflen - 1;
292	215	}
293	215	return utf8buf;
294	215	}