| /* Conversion to UTF-8 from legacy encodings. |
| Copyright (C) 2002, 2006-2007, 2009-2020 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 <https://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; |
| } |
| } |
| |
| if (srclen > 0) |
| 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; |
| } |
| } |