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-rw-r--r--lib/uniconv/u8-conv-from-enc.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/lib/uniconv/u8-conv-from-enc.c b/lib/uniconv/u8-conv-from-enc.c
new file mode 100644
index 00000000..7605e63e
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+++ b/lib/uniconv/u8-conv-from-enc.c
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+/* Conversion to UTF-8 from legacy encodings.
+ Copyright (C) 2002, 2006-2007, 2009 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>. */
+
+#include <config.h>
+
+/* Specification. */
+#include "uniconv.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "c-strcaseeq.h"
+#include "striconveha.h"
+#include "unistr.h"
+
+uint8_t *
+u8_conv_from_encoding (const char *fromcode,
+ enum iconv_ilseq_handler handler,
+ const char *src, size_t srclen,
+ size_t *offsets,
+ uint8_t *resultbuf, size_t *lengthp)
+{
+ if (STRCASEEQ (fromcode, "UTF-8", 'U','T','F','-','8',0,0,0,0))
+ {
+ /* Conversion from UTF-8 to UTF-8. No need to go through iconv(). */
+ uint8_t *result;
+
+ if (u8_check ((const uint8_t *) src, srclen))
+ {
+ errno = EILSEQ;
+ return NULL;
+ }
+
+ if (offsets != NULL)
+ {
+ size_t i;
+
+ for (i = 0; i < srclen; )
+ {
+ int count = u8_mblen ((const uint8_t *) src + i, srclen - i);
+ /* We can rely on count > 0 because of the previous u8_check. */
+ if (count <= 0)
+ abort ();
+ offsets[i] = i;
+ i++;
+ while (--count > 0)
+ offsets[i++] = (size_t)(-1);
+ }
+ }
+
+ /* Memory allocation. */
+ if (resultbuf != NULL && *lengthp >= srclen)
+ result = resultbuf;
+ else
+ {
+ result = (uint8_t *) malloc (srclen > 0 ? srclen : 1);
+ if (result == NULL)
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+ }
+
+ memcpy ((char *) result, src, srclen);
+ *lengthp = srclen;
+ return result;
+ }
+ else
+ {
+ char *result = (char *) resultbuf;
+ size_t length = *lengthp;
+
+ if (mem_iconveha (src, srclen, fromcode, "UTF-8", true, handler,
+ offsets, &result, &length) < 0)
+ return NULL;
+
+ if (result == NULL) /* when (resultbuf == NULL && length == 0) */
+ {
+ result = (char *) malloc (1);
+ if (result == NULL)
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+ }
+ *lengthp = length;
+ return (uint8_t *) result;
+ }
+}