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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/media/platforms/ffmpeg/libav53/include/libavutil/bprint.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/platforms/ffmpeg/libav53/include/libavutil/bprint.h')
-rw-r--r-- | dom/media/platforms/ffmpeg/libav53/include/libavutil/bprint.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/libav53/include/libavutil/bprint.h b/dom/media/platforms/ffmpeg/libav53/include/libavutil/bprint.h new file mode 100644 index 0000000000..c09b61f20f --- /dev/null +++ b/dom/media/platforms/ffmpeg/libav53/include/libavutil/bprint.h @@ -0,0 +1,169 @@ +/* + * Copyright (c) 2012 Nicolas George + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVUTIL_BPRINT_H +#define AVUTIL_BPRINT_H + +#include "attributes.h" + +/** + * Define a structure with extra padding to a fixed size + * This helps ensuring binary compatibility with future versions. + */ +#define FF_PAD_STRUCTURE(size, ...) \ + __VA_ARGS__ \ + char reserved_padding[size - sizeof(struct { __VA_ARGS__ })]; + +/** + * Buffer to print data progressively + * + * The string buffer grows as necessary and is always 0-terminated. + * The content of the string is never accessed, and thus is + * encoding-agnostic and can even hold binary data. + * + * Small buffers are kept in the structure itself, and thus require no + * memory allocation at all (unless the contents of the buffer is needed + * after the structure goes out of scope). This is almost as lightweight as + * declaring a local "char buf[512]". + * + * The length of the string can go beyond the allocated size: the buffer is + * then truncated, but the functions still keep account of the actual total + * length. + * + * In other words, buf->len can be greater than buf->size and records the + * total length of what would have been to the buffer if there had been + * enough memory. + * + * Append operations do not need to be tested for failure: if a memory + * allocation fails, data stop being appended to the buffer, but the length + * is still updated. This situation can be tested with + * av_bprint_is_complete(). + * + * The size_max field determines several possible behaviours: + * + * size_max = -1 (= UINT_MAX) or any large value will let the buffer be + * reallocated as necessary, with an amortized linear cost. + * + * size_max = 0 prevents writing anything to the buffer: only the total + * length is computed. The write operations can then possibly be repeated in + * a buffer with exactly the necessary size + * (using size_init = size_max = len + 1). + * + * size_max = 1 is automatically replaced by the exact size available in the + * structure itself, thus ensuring no dynamic memory allocation. The + * internal buffer is large enough to hold a reasonable paragraph of text, + * such as the current paragraph. + */ +typedef struct AVBPrint { + FF_PAD_STRUCTURE(1024, + char *str; /** string so far */ + unsigned len; /** length so far */ + unsigned size; /** allocated memory */ + unsigned size_max; /** maximum allocated memory */ + char reserved_internal_buffer[1]; + ) +} AVBPrint; + +/** + * Convenience macros for special values for av_bprint_init() size_max + * parameter. + */ +#define AV_BPRINT_SIZE_UNLIMITED ((unsigned)-1) +#define AV_BPRINT_SIZE_AUTOMATIC 1 +#define AV_BPRINT_SIZE_COUNT_ONLY 0 + +/** + * Init a print buffer. + * + * @param buf buffer to init + * @param size_init initial size (including the final 0) + * @param size_max maximum size; + * 0 means do not write anything, just count the length; + * 1 is replaced by the maximum value for automatic storage; + * any large value means that the internal buffer will be + * reallocated as needed up to that limit; -1 is converted to + * UINT_MAX, the largest limit possible. + * Check also AV_BPRINT_SIZE_* macros. + */ +void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max); + +/** + * Init a print buffer using a pre-existing buffer. + * + * The buffer will not be reallocated. + * + * @param buf buffer structure to init + * @param buffer byte buffer to use for the string data + * @param size size of buffer + */ +void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size); + +/** + * Append a formated string to a print buffer. + */ +void av_bprintf(AVBPrint *buf, const char *fmt, ...) av_printf_format(2, 3); + +/** + * Append char c n times to a print buffer. + */ +void av_bprint_chars(AVBPrint *buf, char c, unsigned n); + +/** + * Allocate bytes in the buffer for external use. + * + * @param[in] buf buffer structure + * @param[in] size required size + * @param[out] mem pointer to the memory area + * @param[out] actual_size size of the memory area after allocation; + * can be larger or smaller than size + */ +void av_bprint_get_buffer(AVBPrint *buf, unsigned size, + unsigned char **mem, unsigned *actual_size); + +/** + * Reset the string to "" but keep internal allocated data. + */ +void av_bprint_clear(AVBPrint *buf); + +/** + * Test if the print buffer is complete (not truncated). + * + * It may have been truncated due to a memory allocation failure + * or the size_max limit (compare size and size_max if necessary). + */ +static inline int av_bprint_is_complete(AVBPrint *buf) +{ + return buf->len < buf->size; +} + +/** + * Finalize a print buffer. + * + * The print buffer can no longer be used afterwards, + * but the len and size fields are still valid. + * + * @arg[out] ret_str if not NULL, used to return a permanent copy of the + * buffer contents, or NULL if memory allocation fails; + * if NULL, the buffer is discarded and freed + * @return 0 for success or error code (probably AVERROR(ENOMEM)) + */ +int av_bprint_finalize(AVBPrint *buf, char **ret_str); + +#endif /* AVUTIL_BPRINT_H */ |