mirror of https://git.ffmpeg.org/ffmpeg.git
Add av_file_map() and av_file_unmap() functions.
Originally committed as revision 26073 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini
parent
1ce9d6b85f
commit
0328b9ea39
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@ -1042,6 +1042,7 @@ HAVE_LIST="
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malloc_h
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memalign
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mkstemp
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mmap
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pld
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posix_memalign
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round
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@ -2674,6 +2675,7 @@ check_func inet_aton $network_extralibs
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check_func isatty
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check_func ${malloc_prefix}memalign && enable memalign
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check_func mkstemp
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check_func mmap
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check_func ${malloc_prefix}posix_memalign && enable posix_memalign
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check_func setrlimit
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check_func strerror_r
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@ -13,6 +13,9 @@ libavutil: 2009-03-08
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API changes, most recent first:
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2010-12-22 - r26073 - lavutil 50.36.0 - file.h
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Add functions av_file_map() and av_file_unmap() in file.h.
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2010-12-19 - r26056 - lavutil 50.35.0 - error.h
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Add "not found" error codes:
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AVERROR_DEMUXER_NOT_FOUND
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@ -15,6 +15,7 @@ HEADERS = adler32.h \
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error.h \
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eval.h \
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fifo.h \
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file.h \
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intfloat_readwrite.h \
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intreadwrite.h \
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lfg.h \
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@ -42,6 +43,7 @@ OBJS = adler32.o \
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error.o \
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eval.o \
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fifo.o \
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file.o \
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intfloat_readwrite.o \
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inverse.o \
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lfg.o \
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@ -40,7 +40,7 @@
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#define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
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#define LIBAVUTIL_VERSION_MAJOR 50
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#define LIBAVUTIL_VERSION_MINOR 35
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#define LIBAVUTIL_VERSION_MINOR 36
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#define LIBAVUTIL_VERSION_MICRO 0
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#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
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@ -0,0 +1,123 @@
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; 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 "file.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#if HAVE_MMAP
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#include <sys/mman.h>
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#endif
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typedef struct {
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const AVClass *class;
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int log_offset;
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void *log_ctx;
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} FileLogContext;
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static const AVClass file_log_ctx_class = {
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"FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
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offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
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};
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int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
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int log_offset, void *log_ctx)
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{
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FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
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int err, fd = open(filename, O_RDONLY);
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struct stat st;
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av_unused void *ptr;
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off_t off_size;
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char errbuf[128];
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size_t max_size = HAVE_MMAP ? SIZE_MAX : FF_INTERNAL_MEM_TYPE_MAX_VALUE;
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*bufptr = NULL;
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if (fd < 0) {
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err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
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return err;
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}
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if (lstat(filename, &st) < 0) {
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err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in lstat(): %s\n", errbuf);
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close(fd);
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return err;
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}
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off_size = st.st_size;
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if (off_size > max_size) {
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av_log(&file_log_ctx, AV_LOG_ERROR,
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"File size for file '%s' is too big\n", filename);
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close(fd);
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return AVERROR(EINVAL);
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}
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*size = off_size;
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#if HAVE_MMAP
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ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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if ((int)(ptr) == -1) {
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err = AVERROR(errno);
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av_strerror(err, errbuf, sizeof(errbuf));
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av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
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close(fd);
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return err;
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}
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*bufptr = ptr;
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#else
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*bufptr = av_malloc(*size);
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if (!*bufptr) {
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av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
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close(fd);
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return AVERROR(ENOMEM);
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}
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read(fd, *bufptr, *size);
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#endif
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close(fd);
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return 0;
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}
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void av_file_unmap(uint8_t *bufptr, size_t size)
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{
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#if HAVE_MMAP
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munmap(bufptr, size);
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#else
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av_free(bufptr);
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#endif
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}
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#ifdef TEST
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#undef printf
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int main(void)
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{
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uint8_t *buf;
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size_t size;
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if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
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return 1;
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buf[0] = 's';
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printf("%s", buf);
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av_file_unmap(buf, size);
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return 0;
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}
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#endif
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@ -0,0 +1,51 @@
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; 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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#ifndef AVUTIL_FILE_H
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#define AVUTIL_FILE_H
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#include "avutil.h"
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/**
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* @file misc file utilities
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*/
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/**
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* Read the file with name filename, and put its content in a newly
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* allocated buffer or map it with mmap() when available.
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* In case of success set *bufptr to the read or mmapped buffer, and
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* *size to the size in bytes of the buffer in *bufptr.
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* The returned buffer must be released with av_file_unmap().
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*
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* @param log_offset loglevel offset used for logging
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* @param log_ctx context used for logging
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* @return a non negative number in case of success, a negative value
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* corresponding to an AVERROR error code in case of failure
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*/
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int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
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int log_offset, void *log_ctx);
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/**
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* Unmap or free the buffer bufptr created by av_file_map().
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*
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* @param size size in bytes of bufptr, must be the same as returned
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* by av_file_map()
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*/
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void av_file_unmap(uint8_t *bufptr, size_t size);
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#endif /* AVUTIL_FILE_H */
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@ -64,8 +64,10 @@
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#if LIBAVUTIL_VERSION_MAJOR < 51
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# define FF_INTERNAL_MEM_TYPE unsigned int
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# define FF_INTERNAL_MEM_TYPE_MAX_VALUE UINT_MAX
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#else
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# define FF_INTERNAL_MEM_TYPE size_t
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# define FF_INTERNAL_MEM_TYPE_MAX_VALUE SIZE_MAX
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#endif
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/**
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