/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: 2026-09-14 07:37

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	0	#define UTF_8_LEN_2_MASK 0xe0
90	0	#define UTF_8_LEN_2_MATCH 0xc0
91	0	#define UTF_8_LEN_3_MASK 0xf0
92	0	#define UTF_8_LEN_3_MATCH 0xe0
93	0	#define UTF_8_LEN_4_MASK 0xf8
94	0	#define UTF_8_LEN_4_MATCH 0xf0
95	0	#define UTF_8_CONTINUE_MASK 0xc0
96	0	#define UTF_8_CONTINUE_MATCH 0x80
97	0	#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	0	zip_encoding_type_t _zip_guess_encoding(zip_string_t *str, zip_encoding_type_t expected_encoding) {
104	0	zip_encoding_type_t enc;
105	0	const zip_uint8_t *name;
106	0	zip_uint32_t i, j, ulen, codepoint;
107	0	bool can_be_ascii = true;
108	0	bool can_be_utf8 = true;
109	0	bool has_control_characters = false;
110
111	0	if (str == NULL) {
112	0	return ZIP_ENCODING_ASCII;
113	0	}
114
115	0	name = str->raw;
116
117	0	if (str->encoding != ZIP_ENCODING_UNKNOWN) {
118	0	return str->encoding;
119	0	}
120
121	0	for (i = 0; i < str->length; i++) {
122	0	if (name[i] < 128) {
123	0	if (name[i] < 32 && name[i] != '\r' && name[i] != '\n' && name[i] != '\t') {
124	0	has_control_characters = true;
125	0	}
126	0	continue;
127	0	}
128
129	0	can_be_ascii = false;
130	0	if ((name[i] & UTF_8_LEN_2_MASK) == UTF_8_LEN_2_MATCH) {
131	0	ulen = 1;
132	0	codepoint = name[i] & ~UTF_8_LEN_2_MASK;
133	0	}
134	0	else if ((name[i] & UTF_8_LEN_3_MASK) == UTF_8_LEN_3_MATCH) {
135	0	ulen = 2;
136	0	codepoint = name[i] & ~UTF_8_LEN_3_MASK;
137	0	}
138	0	else if ((name[i] & UTF_8_LEN_4_MASK) == UTF_8_LEN_4_MATCH) {
139	0	ulen = 3;
140	0	codepoint = name[i] & ~UTF_8_LEN_4_MASK;
141	0	}
142	0	else {
143	0	can_be_utf8 = false;
144	0	break;
145	0	}
146
147	0	if (i + ulen >= str->length) {
148	0	can_be_utf8 = false;
149	0	break;
150	0	}
151
152	0	for (j = 1; j <= ulen; j++) {
153	0	if ((name[i + j] & UTF_8_CONTINUE_MASK) != UTF_8_CONTINUE_MATCH) {
154	0	can_be_utf8 = false;
155	0	goto done;
156	0	}
157	0	codepoint = (codepoint << 6) \| (name[i + j] & UTF_8_CONTINUE_VALUE_MASK);
158	0	}
159
160		/* reject overlong encodings, surrogate halves, and code points above U+10FFFF */
161	0	if (codepoint < _utf8_minimum_code_point[ulen] \|\| (codepoint >= 0xd800 && codepoint <= 0xdfff) \|\| codepoint > 0x10ffff) {
162	0	can_be_utf8 = false;
163	0	goto done;
164	0	}
165	0	i += ulen;
166	0	}
167
168	0	done:
169	0	enc = ZIP_ENCODING_CP437;
170
171	0	switch (expected_encoding) {
172	0	case ZIP_ENCODING_UTF8_KNOWN:
173	0	case ZIP_ENCODING_UTF8_GUESSED:
174	0	if (can_be_utf8) {
175	0	enc = ZIP_ENCODING_UTF8_KNOWN;
176	0	}
177	0	else {
178	0	enc = ZIP_ENCODING_ERROR;
179	0	}
180	0	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	0	case ZIP_ENCODING_UNKNOWN:
196	0	if (can_be_ascii && !has_control_characters) {
197		/* only bytes from 0x20-0x7F */
198	0	enc = ZIP_ENCODING_ASCII;
199	0	}
200	0	else if (can_be_ascii && has_control_characters) {
201		/* only bytes from 0x00-0x7F */
202	0	enc = ZIP_ENCODING_CP437;
203	0	}
204	0	else if (can_be_utf8) {
205		/* contains bytes from 0x80-0xFF and is valid UTF-8 */
206	0	enc = ZIP_ENCODING_UTF8_GUESSED;
207	0	}
208	0	else {
209		/* fallback */
210	0	enc = ZIP_ENCODING_CP437;
211	0	}
212	0	break;
213	0	case ZIP_ENCODING_ERROR:
214		/* invalid, shouldn't happen */
215	0	enc = ZIP_ENCODING_ERROR;
216	0	break;
217	0	}
218
219	0	str->encoding = enc;
220	0	return enc;
221	0	}
222
223
224	0	static zip_uint32_t _zip_unicode_to_utf8_len(zip_uint32_t codepoint) {
225	0	if (codepoint < 0x0080) {
226	0	return 1;
227	0	}
228	0	if (codepoint < 0x0800) {
229	0	return 2;
230	0	}
231	0	if (codepoint < 0x10000) {
232	0	return 3;
233	0	}
234	0	return 4;
235	0	}
236
237
238	0	static zip_uint32_t _zip_unicode_to_utf8(zip_uint32_t codepoint, zip_uint8_t *buf) {
239	0	if (codepoint < 0x0080) {
240	0	buf[0] = codepoint & 0xff;
241	0	return 1;
242	0	}
243	0	if (codepoint < 0x0800) {
244	0	buf[0] = (zip_uint8_t)(UTF_8_LEN_2_MATCH \| ((codepoint >> 6) & 0x1f));
245	0	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
246	0	return 2;
247	0	}
248	0	if (codepoint < 0x10000) {
249	0	buf[0] = (zip_uint8_t)(UTF_8_LEN_3_MATCH \| ((codepoint >> 12) & 0x0f));
250	0	buf[1] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| ((codepoint >> 6) & 0x3f));
251	0	buf[2] = (zip_uint8_t)(UTF_8_CONTINUE_MATCH \| (codepoint & 0x3f));
252	0	return 3;
253	0	}
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	0	}
260
261
262	0	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	0	zip_uint8_t cp437buf = (zip_uint8_t )_cp437buf;
264	0	zip_uint8_t *utf8buf;
265	0	zip_uint32_t buflen, i, offset;
266
267	0	if (len == 0) {
268	0	if (utf8_lenp) {
269	0	*utf8_lenp = 0;
270	0	}
271	0	return NULL;
272	0	}
273
274	0	buflen = 1;
275	0	for (i = 0; i < len; i++) {
276	0	buflen += _zip_unicode_to_utf8_len(_cp437_to_unicode[cp437buf[i]]);
277	0	}
278
279	0	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	0	offset = 0;
285	0	for (i = 0; i < len; i++) {
286	0	offset += _zip_unicode_to_utf8(_cp437_to_unicode[cp437buf[i]], utf8buf + offset);
287	0	}
288
289	0	utf8buf[buflen - 1] = 0;
290	0	if (utf8_lenp) {
291	0	*utf8_lenp = buflen - 1;
292	0	}
293	0	return utf8buf;
294	0	}