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4399b0303a
The variable-sized encoding-specific storage of a struct contenc_writer
currently relies on void * alignment that may be insufficient with
regards to the specific storage fields, although having not caused any
problems yet.
In addition, gcc 11.3 issues a warning on access to fields of partially
allocated structures that can occur when the specific storage size is 0:
content_encoding.c: In function ‘Curl_build_unencoding_stack’:
content_encoding.c:980:21: warning: array subscript ‘struct contenc_writer[0]’ is partly outside array bounds of ‘unsigned char[16]’ [-Warray-bounds]
980 | writer->handler = handler;
| ~~~~~~~~~~~~~~~~^~~~~~~~~
In file included from content_encoding.c:49:
memdebug.h:115:29: note: referencing an object of size 16 allocated by ‘curl_dbg_calloc’
115 | #define calloc(nbelem,size) curl_dbg_calloc(nbelem, size, __LINE__, __FILE__)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
content_encoding.c:977:60: note: in expansion of macro ‘calloc’
977 | struct contenc_writer *writer = (struct contenc_writer *)calloc(1, sz);
To solve both these problems, the current commit replaces the
contenc_writer/params structure pairs by "subclasses" of struct
contenc_writer. These are structures that contain a contenc_writer at
offset 0. Proper field alignment is therefore handled by the compiler and
full structure allocation is performed, silencing the warnings.
Closes #9455
57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
#ifndef HEADER_CURL_CONTENT_ENCODING_H
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#define HEADER_CURL_CONTENT_ENCODING_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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struct contenc_writer {
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const struct content_encoding *handler; /* Encoding handler. */
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struct contenc_writer *downstream; /* Downstream writer. */
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};
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/* Content encoding writer. */
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struct content_encoding {
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const char *name; /* Encoding name. */
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const char *alias; /* Encoding name alias. */
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CURLcode (*init_writer)(struct Curl_easy *data,
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struct contenc_writer *writer);
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CURLcode (*unencode_write)(struct Curl_easy *data,
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struct contenc_writer *writer,
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const char *buf, size_t nbytes);
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void (*close_writer)(struct Curl_easy *data,
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struct contenc_writer *writer);
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size_t writersize;
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};
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CURLcode Curl_build_unencoding_stack(struct Curl_easy *data,
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const char *enclist, int maybechunked);
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CURLcode Curl_unencode_write(struct Curl_easy *data,
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struct contenc_writer *writer,
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const char *buf, size_t nbytes);
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void Curl_unencode_cleanup(struct Curl_easy *data);
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char *Curl_all_content_encodings(void);
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#endif /* HEADER_CURL_CONTENT_ENCODING_H */
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