mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-22 07:03:38 +00:00
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/* libguestfs
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* Copyright (C) 2010-2012 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <iconv.h>
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#include "guestfs.h"
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#include "guestfs-internal.h"
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#include "guestfs-internal-actions.h"
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/* Read the data from 'valueh', assume it is UTF16LE and convert it to
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* UTF8. This is copied from hivex_value_string which doesn't work in
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* the appliance because it uses iconv_open which doesn't work because
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* we delete all the i18n databases.
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*/
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static char *utf16_to_utf8 (/* const */ char *input, size_t len);
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char *
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guestfs_impl_hivex_value_utf8 (guestfs_h *g, int64_t valueh)
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{
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char *ret;
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size_t buflen;
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CLEANUP_FREE char *buf = guestfs_hivex_value_value (g, valueh, &buflen);
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if (buf == NULL)
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return NULL;
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ret = utf16_to_utf8 (buf, buflen);
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if (ret == NULL) {
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perrorf (g, "hivex: conversion of registry value to UTF8 failed");
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return NULL;
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}
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return ret;
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}
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static char *
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utf16_to_utf8 (/* const */ char *input, size_t len)
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{
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iconv_t ic = iconv_open ("UTF-8", "UTF-16LE");
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if (ic == (iconv_t) -1)
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return NULL;
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/* iconv(3) has an insane interface ... */
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/* Mostly UTF-8 will be smaller, so this is a good initial guess. */
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size_t outalloc = len;
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again:;
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size_t inlen = len;
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size_t outlen = outalloc;
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char *out = malloc (outlen + 1);
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if (out == NULL) {
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int err = errno;
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iconv_close (ic);
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errno = err;
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return NULL;
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}
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char *inp = input;
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char *outp = out;
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const size_t r =
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iconv (ic, (ICONV_CONST char **) &inp, &inlen, &outp, &outlen);
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if (r == (size_t) -1) {
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if (errno == E2BIG) {
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const int err = errno;
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const size_t prev = outalloc;
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/* Try again with a larger output buffer. */
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free (out);
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outalloc *= 2;
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if (outalloc < prev) {
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iconv_close (ic);
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errno = err;
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return NULL;
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}
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goto again;
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}
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else {
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/* Else some conversion failure, eg. EILSEQ, EINVAL. */
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const int err = errno;
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iconv_close (ic);
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free (out);
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errno = err;
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return NULL;
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}
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}
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*outp = '\0';
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iconv_close (ic);
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return out;
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}
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