NLS: improve UTF8 -> UTF16 string conversion routine
The utf8s_to_utf16s conversion routine needs to be improved. Unlike its utf16s_to_utf8s sibling, it doesn't accept arguments specifying the maximum length of the output buffer or the endianness of its 16-bit output. This patch (as1501) adds the two missing arguments, and adjusts the only two places in the kernel where the function is called. A follow-on patch will add a third caller that does utilize the new capabilities. The two conversion routines are still annoyingly inconsistent in the way they handle invalid byte combinations. But that's a subject for a different patch. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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b7463c71fb
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0720a06a75
4 changed files with 48 additions and 21 deletions
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@ -212,11 +212,13 @@ kvp_respond_to_host(char *key, char *value, int error)
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* The windows host expects the key/value pair to be encoded
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* in utf16.
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*/
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keylen = utf8s_to_utf16s(key_name, strlen(key_name),
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(wchar_t *)kvp_data->data.key);
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keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN,
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(wchar_t *) kvp_data->data.key,
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HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2);
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kvp_data->data.key_size = 2*(keylen + 1); /* utf16 encoding */
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valuelen = utf8s_to_utf16s(value, strlen(value),
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(wchar_t *)kvp_data->data.value);
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valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN,
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(wchar_t *) kvp_data->data.value,
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HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2);
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kvp_data->data.value_size = 2*(valuelen + 1); /* utf16 encoding */
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kvp_data->data.value_type = REG_SZ; /* all our values are strings */
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@ -512,7 +512,8 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
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int charlen;
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if (utf8) {
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*outlen = utf8s_to_utf16s(name, len, (wchar_t *)outname);
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*outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN,
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(wchar_t *) outname, FAT_LFN_LEN + 2);
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if (*outlen < 0)
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return *outlen;
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else if (*outlen > FAT_LFN_LEN)
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@ -114,34 +114,57 @@ int utf32_to_utf8(unicode_t u, u8 *s, int maxlen)
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}
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EXPORT_SYMBOL(utf32_to_utf8);
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int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs)
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static inline void put_utf16(wchar_t *s, unsigned c, enum utf16_endian endian)
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{
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switch (endian) {
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default:
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*s = (wchar_t) c;
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break;
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case UTF16_LITTLE_ENDIAN:
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*s = __cpu_to_le16(c);
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break;
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case UTF16_BIG_ENDIAN:
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*s = __cpu_to_be16(c);
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break;
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}
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}
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int utf8s_to_utf16s(const u8 *s, int len, enum utf16_endian endian,
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wchar_t *pwcs, int maxlen)
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{
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u16 *op;
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int size;
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unicode_t u;
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op = pwcs;
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while (*s && len > 0) {
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while (len > 0 && maxlen > 0 && *s) {
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if (*s & 0x80) {
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size = utf8_to_utf32(s, len, &u);
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if (size < 0)
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return -EINVAL;
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if (u >= PLANE_SIZE) {
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u -= PLANE_SIZE;
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*op++ = (wchar_t) (SURROGATE_PAIR |
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((u >> 10) & SURROGATE_BITS));
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*op++ = (wchar_t) (SURROGATE_PAIR |
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SURROGATE_LOW |
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(u & SURROGATE_BITS));
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} else {
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*op++ = (wchar_t) u;
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}
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s += size;
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len -= size;
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if (u >= PLANE_SIZE) {
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if (maxlen < 2)
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break;
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u -= PLANE_SIZE;
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put_utf16(op++, SURROGATE_PAIR |
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((u >> 10) & SURROGATE_BITS),
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endian);
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put_utf16(op++, SURROGATE_PAIR |
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SURROGATE_LOW |
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(u & SURROGATE_BITS),
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endian);
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maxlen -= 2;
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} else {
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put_utf16(op++, u, endian);
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maxlen--;
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}
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} else {
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*op++ = *s++;
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put_utf16(op++, *s++, endian);
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len--;
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maxlen--;
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}
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}
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return op - pwcs;
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@ -43,7 +43,7 @@ enum utf16_endian {
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UTF16_BIG_ENDIAN
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};
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/* nls.c */
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/* nls_base.c */
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extern int register_nls(struct nls_table *);
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extern int unregister_nls(struct nls_table *);
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extern struct nls_table *load_nls(char *);
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@ -52,7 +52,8 @@ extern struct nls_table *load_nls_default(void);
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extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu);
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extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen);
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extern int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs);
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extern int utf8s_to_utf16s(const u8 *s, int len,
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enum utf16_endian endian, wchar_t *pwcs, int maxlen);
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extern int utf16s_to_utf8s(const wchar_t *pwcs, int len,
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enum utf16_endian endian, u8 *s, int maxlen);
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