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/*
* 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
*/
#include "config.h"
#include "file.h"
#include "file_open.h"
#include "internal.h"
#include "log.h"
#include "mem.h"
#include <fcntl.h>
#include <sys/stat.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_IO_H
#include <io.h>
#endif
#if HAVE_MMAP
#include <sys/mman.h>
#elif HAVE_MAPVIEWOFFILE
#include <windows.h>
#endif
typedef struct FileLogContext {
const AVClass *class;
int log_offset;
void *log_ctx;
} FileLogContext;
static const AVClass file_log_ctx_class = {
.class_name = "FILE",
.item_name = av_default_item_name,
.option = NULL,
.version = LIBAVUTIL_VERSION_INT,
.log_level_offset_offset = offsetof(FileLogContext, log_offset),
.parent_log_context_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 = avpriv_open(filename, O_RDONLY);
struct stat st;
av_unused void *ptr;
off_t off_size;
char errbuf[128];
*bufptr = NULL;
*size = 0;
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 (!*size) {
*bufptr = NULL;
goto out;
}
#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);
*size = 0;
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);
*size = 0;
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);
*size = 0;
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);
*size = 0;
return AVERROR(ENOMEM);
}
read(fd, *bufptr, *size);
#endif
out:
close(fd);
return 0;
}
void av_file_unmap(uint8_t *bufptr, size_t size)
{
if (!size || !bufptr)
return;
#if HAVE_MMAP
munmap(bufptr, size);
#elif HAVE_MAPVIEWOFFILE
UnmapViewOfFile(bufptr);
#else
av_free(bufptr);
#endif
}
#if FF_API_AV_FOPEN_UTF8
int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx) {
return avpriv_tempfile(prefix, filename, log_offset, log_ctx);
}
#endif
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