| 1 | |
| 2 | |
| 3 | * Some of the source code in this file came from fs/cifs/cifs_unicode.c
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| 4 | *
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| 5 | * Copyright (c) International Business Machines Corp., 2000,2009
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| 6 | * Modified by Steve French ([email protected])
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| 7 | * Modified by Namjae Jeon ([email protected])
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| 8 |
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| 9 | #include <linux/fs.h>
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| 10 | #include <linux/slab.h>
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| 11 | #include <linux/unaligned.h>
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| 12 | #include "glob.h"
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| 13 | #include "unicode.h"
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| 14 | #include "smb_common.h"
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| 15 |
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| 16 | |
| 17 | * cifs_mapchar() - convert a host-endian char to proper char in codepage
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| 18 | * @target: where converted character should be copied
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| 19 | * @from: host-endian source string
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| 20 | * @cp: codepage to which character should be converted
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| 21 | * @mapchar: should character be mapped according to mapchars mount option?
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| 22 | *
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| 23 | * This function handles the conversion of a single character. It is the
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| 24 | * responsibility of the caller to ensure that the target buffer is large
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| 25 | * enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE).
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| 26 | *
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| 27 | * Return: string length after conversion
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| 28 |
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| 29 | static int
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| 30 | cifs_mapchar(char *target, const __u16 *from, const struct nls_table *cp,
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| 31 | bool mapchar)
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| 32 | {
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| 33 | int len = 1;
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| 34 | __u16 src_char;
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| 35 |
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| 36 | src_char = *from;
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| 37 |
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| 38 | if (!mapchar)
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| 39 | goto cp_convert;
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| 40 |
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| 41 | |
| 42 | * BB: Cannot handle remapping UNI_SLASH until all the calls to
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| 43 | * build_path_from_dentry are modified, as they use slash as
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| 44 | * separator.
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| 45 |
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| 46 | switch (src_char) {
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| 47 | case UNI_COLON:
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| 48 | *target = ':';
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| 49 | break;
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| 50 | case UNI_ASTERISK:
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| 51 | *target = '*';
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| 52 | break;
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| 53 | case UNI_QUESTION:
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| 54 | *target = '?';
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| 55 | break;
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| 56 | case UNI_PIPE:
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| 57 | *target = '|';
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| 58 | break;
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| 59 | case UNI_GRTRTHAN:
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| 60 | *target = '>';
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| 61 | break;
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| 62 | case UNI_LESSTHAN:
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| 63 | *target = '<';
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| 64 | break;
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| 65 | default:
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| 66 | goto cp_convert;
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| 67 | }
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| 68 |
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| 69 | out:
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| 70 | return len;
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| 71 |
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| 72 | cp_convert:
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| 73 | len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE);
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| 74 | if (len <= 0)
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| 75 | goto surrogate_pair;
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| 76 |
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| 77 | goto out;
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| 78 |
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| 79 | surrogate_pair:
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| 80 |
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| 81 | if (strcmp(cp->charset, "utf8"))
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| 82 | goto unknown;
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| 83 | len = utf16s_to_utf8s(from, 3, UTF16_LITTLE_ENDIAN, target, 6);
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| 84 | if (len <= 0)
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| 85 | goto unknown;
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| 86 | return len;
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| 87 |
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| 88 | unknown:
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| 89 | *target = '?';
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| 90 | len = 1;
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| 91 | goto out;
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| 92 | }
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| 93 |
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| 94 | |
| 95 | * smb_utf16_bytes() - compute converted string length
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| 96 | * @from: pointer to input string
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| 97 | * @maxbytes: input string length
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| 98 | * @codepage: destination codepage
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| 99 | *
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| 100 | * Walk a utf16le string and return the number of bytes that the string will
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| 101 | * be after being converted to the given charset, not including any null
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| 102 | * termination required. Don't walk past maxbytes in the source buffer.
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| 103 | *
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| 104 | * Return: string length after conversion
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| 105 |
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| 106 | static int smb_utf16_bytes(const __le16 *from, int maxbytes,
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| 107 | const struct nls_table *codepage)
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| 108 | {
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| 109 | int i, j;
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| 110 | int charlen, outlen = 0;
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| 111 | int maxwords = maxbytes / 2;
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| 112 | char tmp[NLS_MAX_CHARSET_SIZE];
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| 113 | __u16 ftmp[3];
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| 114 |
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| 115 | for (i = 0; i < maxwords; i++) {
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| 116 | ftmp[0] = get_unaligned_le16(&from[i]);
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| 117 | if (ftmp[0] == 0)
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| 118 | break;
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| 119 | for (j = 1; j <= 2; j++) {
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| 120 | if (i + j < maxwords)
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| 121 | ftmp[j] = get_unaligned_le16(&from[i + j]);
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| 122 | else
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| 123 | ftmp[j] = 0;
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| 124 | }
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| 125 |
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| 126 | charlen = cifs_mapchar(tmp, ftmp, codepage, 0);
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| 127 | if (charlen > 0)
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| 128 | outlen += charlen;
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| 129 | else
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| 130 | outlen++;
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| 131 | }
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| 132 |
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| 133 | return outlen;
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| 134 | }
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| 135 |
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| 136 | |
| 137 | * smb_from_utf16() - convert utf16le string to local charset
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| 138 | * @to: destination buffer
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| 139 | * @from: source buffer
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| 140 | * @tolen: destination buffer size (in bytes)
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| 141 | * @fromlen: source buffer size (in bytes)
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| 142 | * @codepage: codepage to which characters should be converted
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| 143 | * @mapchar: should characters be remapped according to the mapchars option?
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| 144 | *
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| 145 | * Convert a little-endian utf16le string (as sent by the server) to a string
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| 146 | * in the provided codepage. The tolen and fromlen parameters are to ensure
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| 147 | * that the code doesn't walk off of the end of the buffer (which is always
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| 148 | * a danger if the alignment of the source buffer is off). The destination
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| 149 | * string is always properly null terminated and fits in the destination
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| 150 | * buffer. Returns the length of the destination string in bytes (including
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| 151 | * null terminator).
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| 152 | *
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| 153 | * Note that some windows versions actually send multiword UTF-16 characters
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| 154 | * instead of straight UTF16-2. The linux nls routines however aren't able to
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| 155 | * deal with those characters properly. In the event that we get some of
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| 156 | * those characters, they won't be translated properly.
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| 157 | *
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| 158 | * Return: string length after conversion
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| 159 |
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| 160 | static int smb_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
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| 161 | const struct nls_table *codepage, bool mapchar)
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| 162 | {
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| 163 | int i, j, charlen, safelen;
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| 164 | int outlen = 0;
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| 165 | int nullsize = nls_nullsize(codepage);
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| 166 | int fromwords = fromlen / 2;
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| 167 | char tmp[NLS_MAX_CHARSET_SIZE];
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| 168 | __u16 ftmp[3];
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| 169 |
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| 170 | |
| 171 | * because the chars can be of varying widths, we need to take care
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| 172 | * not to overflow the destination buffer when we get close to the
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| 173 | * end of it. Until we get to this offset, we don't need to check
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| 174 | * for overflow however.
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| 175 |
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| 176 | safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize);
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| 177 |
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| 178 | for (i = 0; i < fromwords; i++) {
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| 179 | ftmp[0] = get_unaligned_le16(&from[i]);
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| 180 | if (ftmp[0] == 0)
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| 181 | break;
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| 182 | for (j = 1; j <= 2; j++) {
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| 183 | if (i + j < fromwords)
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| 184 | ftmp[j] = get_unaligned_le16(&from[i + j]);
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| 185 | else
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| 186 | ftmp[j] = 0;
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| 187 | }
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| 188 |
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| 189 | |
| 190 | * check to see if converting this character might make the
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| 191 | * conversion bleed into the null terminator
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| 192 |
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| 193 | if (outlen >= safelen) {
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| 194 | charlen = cifs_mapchar(tmp, ftmp, codepage, mapchar);
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| 195 | if ((outlen + charlen) > (tolen - nullsize))
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| 196 | break;
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| 197 | }
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| 198 |
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| 199 |
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| 200 | charlen = cifs_mapchar(&to[outlen], ftmp, codepage, mapchar);
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| 201 | outlen += charlen;
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| 202 |
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| 203 | |
| 204 | * charlen (=bytes of UTF-8 for 1 character)
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| 205 | * 4bytes UTF-8(surrogate pair) is charlen=4
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| 206 | * (4bytes UTF-16 code)
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| 207 | * 7-8bytes UTF-8(IVS) is charlen=3+4 or 4+4
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| 208 | * (2 UTF-8 pairs divided to 2 UTF-16 pairs)
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| 209 |
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| 210 | if (charlen == 4)
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| 211 | i++;
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| 212 | else if (charlen >= 5)
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| 213 |
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| 214 | i += 2;
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| 215 | }
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| 216 |
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| 217 |
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| 218 | for (i = 0; i < nullsize; i++)
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| 219 | to[outlen++] = 0;
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| 220 |
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| 221 | return outlen;
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| 222 | }
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| 223 |
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| 224 | |
| 225 | * smb_strtoUTF16() - Convert character string to unicode string
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| 226 | * @to: destination buffer
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| 227 | * @from: source buffer
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| 228 | * @len: destination buffer size (in bytes)
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| 229 | * @codepage: codepage to which characters should be converted
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| 230 | *
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| 231 | * Return: string length after conversion
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| 232 |
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| 233 | int smb_strtoUTF16(__le16 *to, const char *from, int len,
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| 234 | const struct nls_table *codepage)
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| 235 | {
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| 236 | int charlen;
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| 237 | int i;
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| 238 | wchar_t wchar_to;
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| 239 |
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| 240 |
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| 241 | if (!strcmp(codepage->charset, "utf8")) {
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| 242 | |
| 243 | * convert utf8 -> utf16, we assume we have enough space
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| 244 | * as caller should have assumed conversion does not overflow
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| 245 | * in destination len is length in wchar_t units (16bits)
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| 246 |
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| 247 | i = utf8s_to_utf16s(from, len, UTF16_LITTLE_ENDIAN,
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| 248 | (wchar_t *)to, len);
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| 249 |
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| 250 |
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| 251 | if (i >= 0)
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| 252 | goto success;
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| 253 | |
| 254 | * if fails fall back to UCS encoding as this
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| 255 | * function should not return negative values
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| 256 | * currently can fail only if source contains
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| 257 | * invalid encoded characters
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| 258 |
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| 259 | }
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| 260 |
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| 261 | for (i = 0; len > 0 && *from; i++, from += charlen, len -= charlen) {
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| 262 | charlen = codepage->char2uni(from, len, &wchar_to);
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| 263 | if (charlen < 1) {
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| 264 |
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| 265 | wchar_to = 0x003f;
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| 266 | charlen = 1;
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| 267 | }
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| 268 | put_unaligned_le16(wchar_to, &to[i]);
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| 269 | }
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| 270 |
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| 271 | success:
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| 272 | put_unaligned_le16(0, &to[i]);
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| 273 | return i;
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| 274 | }
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| 275 |
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| 276 | |
| 277 | * smb_strndup_from_utf16() - copy a string from wire format to the local
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| 278 | * codepage
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| 279 | * @src: source string
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| 280 | * @maxlen: don't walk past this many bytes in the source string
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| 281 | * @is_unicode: is this a unicode string?
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| 282 | * @codepage: destination codepage
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| 283 | *
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| 284 | * Take a string given by the server, convert it to the local codepage and
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| 285 | * put it in a new buffer. Returns a pointer to the new string or NULL on
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| 286 | * error.
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| 287 | *
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| 288 | * Return: destination string buffer or error ptr
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| 289 |
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| 290 | char *smb_strndup_from_utf16(const char *src, const int maxlen,
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| 291 | const bool is_unicode,
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| 292 | const struct nls_table *codepage)
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| 293 | {
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| 294 | int len, ret;
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| 295 | char *dst;
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| 296 |
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| 297 | if (is_unicode) {
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| 298 | len = smb_utf16_bytes((__le16 *)src, maxlen, codepage);
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| 299 | len += nls_nullsize(codepage);
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| 300 | dst = kmalloc(len, KSMBD_DEFAULT_GFP);
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| 301 | if (!dst)
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| 302 | return ERR_PTR(-ENOMEM);
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| 303 | ret = smb_from_utf16(dst, (__le16 *)src, len, maxlen, codepage,
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| 304 | false);
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| 305 | if (ret < 0) {
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| 306 | kfree(dst);
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| 307 | return ERR_PTR(-EINVAL);
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| 308 | }
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| 309 | } else {
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| 310 | len = strnlen(src, maxlen);
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| 311 | len++;
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| 312 | dst = kmalloc(len, KSMBD_DEFAULT_GFP);
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| 313 | if (!dst)
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| 314 | return ERR_PTR(-ENOMEM);
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| 315 | strscpy(dst, src, len);
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| 316 | }
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| 317 |
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| 318 | return dst;
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| 319 | }
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| 320 |
|
| 321 | |
| 322 | * Convert 16 bit Unicode pathname to wire format from string in current code
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| 323 | * page. Conversion may involve remapping up the six characters that are
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| 324 | * only legal in POSIX-like OS (if they are present in the string). Path
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| 325 | * names are little endian 16 bit Unicode on the wire
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| 326 |
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| 327 | |
| 328 | * smbConvertToUTF16() - convert string from local charset to utf16
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| 329 | * @target: destination buffer
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| 330 | * @source: source buffer
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| 331 | * @srclen: source buffer size (in bytes)
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| 332 | * @cp: codepage to which characters should be converted
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| 333 | * @mapchar: should characters be remapped according to the mapchars option?
|
| 334 | *
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| 335 | * Convert 16 bit Unicode pathname to wire format from string in current code
|
| 336 | * page. Conversion may involve remapping up the six characters that are
|
| 337 | * only legal in POSIX-like OS (if they are present in the string). Path
|
| 338 | * names are little endian 16 bit Unicode on the wire
|
| 339 | *
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| 340 | * Return: char length after conversion
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| 341 |
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| 342 | int smbConvertToUTF16(__le16 *target, const char *source, int srclen,
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| 343 | const struct nls_table *cp, int mapchars)
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| 344 | {
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| 345 | int i, j, charlen;
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| 346 | char src_char;
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| 347 | __le16 dst_char;
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| 348 | wchar_t tmp;
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| 349 | wchar_t wchar_to[6];
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| 350 | int ret;
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| 351 | unicode_t u;
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| 352 |
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| 353 | if (!mapchars)
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| 354 | return smb_strtoUTF16(target, source, srclen, cp);
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| 355 |
|
| 356 | for (i = 0, j = 0; i < srclen; j++) {
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| 357 | src_char = source[i];
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| 358 | charlen = 1;
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| 359 | switch (src_char) {
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| 360 | case 0:
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| 361 | put_unaligned(0, &target[j]);
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| 362 | return j;
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| 363 | case ':':
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| 364 | dst_char = cpu_to_le16(UNI_COLON);
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| 365 | break;
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| 366 | case '*':
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| 367 | dst_char = cpu_to_le16(UNI_ASTERISK);
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| 368 | break;
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| 369 | case '?':
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| 370 | dst_char = cpu_to_le16(UNI_QUESTION);
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| 371 | break;
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| 372 | case '<':
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| 373 | dst_char = cpu_to_le16(UNI_LESSTHAN);
|
| 374 | break;
|
| 375 | case '>':
|
| 376 | dst_char = cpu_to_le16(UNI_GRTRTHAN);
|
| 377 | break;
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| 378 | case '|':
|
| 379 | dst_char = cpu_to_le16(UNI_PIPE);
|
| 380 | break;
|
| 381 | |
| 382 | * FIXME: We can not handle remapping backslash (UNI_SLASH)
|
| 383 | * until all the calls to build_path_from_dentry are modified,
|
| 384 | * as they use backslash as separator.
|
| 385 |
|
| 386 | default:
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| 387 | charlen = cp->char2uni(source + i, srclen - i, &tmp);
|
| 388 | dst_char = cpu_to_le16(tmp);
|
| 389 |
|
| 390 | |
| 391 | * if no match, use question mark, which at least in
|
| 392 | * some cases serves as wild card
|
| 393 |
|
| 394 | if (charlen > 0)
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| 395 | goto ctoUTF16;
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| 396 |
|
| 397 |
|
| 398 | if (strcmp(cp->charset, "utf8"))
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| 399 | goto unknown;
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| 400 | if (*(source + i) & 0x80) {
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| 401 | charlen = utf8_to_utf32(source + i, 6, &u);
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| 402 | if (charlen < 0)
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| 403 | goto unknown;
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| 404 | } else
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| 405 | goto unknown;
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| 406 | ret = utf8s_to_utf16s(source + i, charlen,
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| 407 | UTF16_LITTLE_ENDIAN,
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| 408 | wchar_to, 6);
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| 409 | if (ret < 0)
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| 410 | goto unknown;
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| 411 |
|
| 412 | i += charlen;
|
| 413 | dst_char = cpu_to_le16(*wchar_to);
|
| 414 | if (charlen <= 3)
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| 415 |
|
| 416 | put_unaligned(dst_char, &target[j]);
|
| 417 | else if (charlen == 4) {
|
| 418 | |
| 419 | * 4bytes UTF-8(surrogate pair) to 4bytes UTF-16
|
| 420 | * 7-8bytes UTF-8(IVS) divided to 2 UTF-16
|
| 421 | * (charlen=3+4 or 4+4)
|
| 422 |
|
| 423 | put_unaligned(dst_char, &target[j]);
|
| 424 | dst_char = cpu_to_le16(*(wchar_to + 1));
|
| 425 | j++;
|
| 426 | put_unaligned(dst_char, &target[j]);
|
| 427 | } else if (charlen >= 5) {
|
| 428 |
|
| 429 | put_unaligned(dst_char, &target[j]);
|
| 430 | dst_char = cpu_to_le16(*(wchar_to + 1));
|
| 431 | j++;
|
| 432 | put_unaligned(dst_char, &target[j]);
|
| 433 | dst_char = cpu_to_le16(*(wchar_to + 2));
|
| 434 | j++;
|
| 435 | put_unaligned(dst_char, &target[j]);
|
| 436 | }
|
| 437 | continue;
|
| 438 |
|
| 439 | unknown:
|
| 440 | dst_char = cpu_to_le16(0x003f);
|
| 441 | charlen = 1;
|
| 442 | }
|
| 443 |
|
| 444 | ctoUTF16:
|
| 445 | |
| 446 | * character may take more than one byte in the source string,
|
| 447 | * but will take exactly two bytes in the target string
|
| 448 |
|
| 449 | i += charlen;
|
| 450 | put_unaligned(dst_char, &target[j]);
|
| 451 | }
|
| 452 |
|
| 453 | return j;
|
| 454 | }
|