mirror of https://git.ffmpeg.org/ffmpeg.git
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "file.h"
|
|
#include "log.h"
|
|
#include "mem.h"
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#if HAVE_MMAP
|
|
#include <sys/mman.h>
|
|
#elif HAVE_MAPVIEWOFFILE
|
|
#include <io.h>
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
typedef struct {
|
|
const AVClass *class;
|
|
int log_offset;
|
|
void *log_ctx;
|
|
} FileLogContext;
|
|
|
|
static const AVClass file_log_ctx_class = {
|
|
"FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
|
|
offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
|
|
};
|
|
|
|
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
|
|
int log_offset, void *log_ctx)
|
|
{
|
|
FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
|
|
int err, fd = open(filename, O_RDONLY);
|
|
struct stat st;
|
|
av_unused void *ptr;
|
|
off_t off_size;
|
|
char errbuf[128];
|
|
*bufptr = NULL;
|
|
|
|
if (fd < 0) {
|
|
err = AVERROR(errno);
|
|
av_strerror(err, errbuf, sizeof(errbuf));
|
|
av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
|
|
return err;
|
|
}
|
|
|
|
if (fstat(fd, &st) < 0) {
|
|
err = AVERROR(errno);
|
|
av_strerror(err, errbuf, sizeof(errbuf));
|
|
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf);
|
|
close(fd);
|
|
return err;
|
|
}
|
|
|
|
off_size = st.st_size;
|
|
if (off_size > SIZE_MAX) {
|
|
av_log(&file_log_ctx, AV_LOG_ERROR,
|
|
"File size for file '%s' is too big\n", filename);
|
|
close(fd);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
*size = off_size;
|
|
|
|
#if HAVE_MMAP
|
|
ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
|
|
if (ptr == MAP_FAILED) {
|
|
err = AVERROR(errno);
|
|
av_strerror(err, errbuf, sizeof(errbuf));
|
|
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
|
|
close(fd);
|
|
return err;
|
|
}
|
|
*bufptr = ptr;
|
|
#elif HAVE_MAPVIEWOFFILE
|
|
{
|
|
HANDLE mh, fh = (HANDLE)_get_osfhandle(fd);
|
|
|
|
mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL);
|
|
if (!mh) {
|
|
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
|
|
CloseHandle(mh);
|
|
if (!ptr) {
|
|
av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
*bufptr = ptr;
|
|
}
|
|
#else
|
|
*bufptr = av_malloc(*size);
|
|
if (!*bufptr) {
|
|
av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
|
|
close(fd);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
read(fd, *bufptr, *size);
|
|
#endif
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
void av_file_unmap(uint8_t *bufptr, size_t size)
|
|
{
|
|
#if HAVE_MMAP
|
|
munmap(bufptr, size);
|
|
#elif HAVE_MAPVIEWOFFILE
|
|
UnmapViewOfFile(bufptr);
|
|
#else
|
|
av_free(bufptr);
|
|
#endif
|
|
}
|