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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 "internal.h"
#include "log.h"
#include "mem.h"
#include <stdarg.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
int avpriv_open(const char *filename, int flags, ...)
{
int fd;
unsigned int mode = 0;
va_list ap;
va_start(ap, flags);
if (flags & O_CREAT)
mode = va_arg(ap, unsigned int);
va_end(ap);
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
fd = open(filename, flags, mode);
if (fd != -1)
fcntl(fd, F_SETFD, FD_CLOEXEC);
return fd;
}
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 = avpriv_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
}
int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx) {
FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
int fd=-1;
#if !HAVE_MKSTEMP
void *ptr= tempnam(NULL, prefix);
if(!ptr)
ptr= tempnam(".", prefix);
*filename = av_strdup(ptr);
#undef free
free(ptr);
#else
size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
*filename = av_malloc(len);
#endif
/* -----common section-----*/
if (*filename == NULL) {
av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
return AVERROR(ENOMEM);
}
#if !HAVE_MKSTEMP
# ifndef O_BINARY
# define O_BINARY 0
# endif
# ifndef O_EXCL
# define O_EXCL 0
# endif
fd = open(*filename, O_RDWR | O_BINARY | O_CREAT | O_EXCL, 0600);
#else
snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
fd = mkstemp(*filename);
#ifdef _WIN32
if (fd < 0) {
snprintf(*filename, len, "./%sXXXXXX", prefix);
fd = mkstemp(*filename);
}
#endif
#endif
/* -----common section-----*/
if (fd < 0) {
int err = AVERROR(errno);
av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
av_freep(filename);
return err;
}
return fd; /* success */
}
#ifdef TEST
#undef printf
int main(void)
{
uint8_t *buf;
size_t size;
if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
return 1;
buf[0] = 's';
printf("%s", buf);
av_file_unmap(buf, size);
return 0;
}
#endif
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