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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. #include "config.h"
  20. #include "file.h"
  21. #include "internal.h"
  22. #include "log.h"
  23. #include "mem.h"
  24. #include <fcntl.h>
  25. #include <sys/stat.h>
  26. #if HAVE_UNISTD_H
  27. #include <unistd.h>
  28. #endif
  29. #if HAVE_MMAP
  30. #include <sys/mman.h>
  31. #endif
  32.  
  33. typedef struct {
  34.     const AVClass *class;
  35.     int   log_offset;
  36.     void *log_ctx;
  37. } FileLogContext;
  38.  
  39. static const AVClass file_log_ctx_class = {
  40.     "FILE", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT,
  41.     offsetof(FileLogContext, log_offset), offsetof(FileLogContext, log_ctx)
  42. };
  43.  
  44. int av_file_map(const char *filename, uint8_t **bufptr, size_t *size,
  45.                 int log_offset, void *log_ctx)
  46. {
  47.     FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
  48.     int err, fd = avpriv_open(filename, O_RDONLY);
  49.     struct stat st;
  50.     av_unused void *ptr;
  51.     off_t off_size;
  52.     char errbuf[128];
  53.     *bufptr = NULL;
  54.  
  55.     if (fd < 0) {
  56.         err = AVERROR(errno);
  57.         av_strerror(err, errbuf, sizeof(errbuf));
  58.         av_log(&file_log_ctx, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename, errbuf);
  59.         return err;
  60.     }
  61.  
  62.     if (fstat(fd, &st) < 0) {
  63.         err = AVERROR(errno);
  64.         av_strerror(err, errbuf, sizeof(errbuf));
  65.         av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in fstat(): %s\n", errbuf);
  66.         close(fd);
  67.         return err;
  68.     }
  69.  
  70.     off_size = st.st_size;
  71.     if (off_size > SIZE_MAX) {
  72.         av_log(&file_log_ctx, AV_LOG_ERROR,
  73.                "File size for file '%s' is too big\n", filename);
  74.         close(fd);
  75.         return AVERROR(EINVAL);
  76.     }
  77.     *size = off_size;
  78.  
  79. #if HAVE_MMAP
  80.     ptr = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
  81.     if (ptr == MAP_FAILED) {
  82.         err = AVERROR(errno);
  83.         av_strerror(err, errbuf, sizeof(errbuf));
  84.         av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in mmap(): %s\n", errbuf);
  85.         close(fd);
  86.         return err;
  87.     }
  88.     *bufptr = ptr;
  89. #elif HAVE_MAPVIEWOFFILE
  90.     {
  91.         HANDLE mh, fh = (HANDLE)_get_osfhandle(fd);
  92.  
  93.         mh = CreateFileMapping(fh, NULL, PAGE_READONLY, 0, 0, NULL);
  94.         if (!mh) {
  95.             av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in CreateFileMapping()\n");
  96.             close(fd);
  97.             return -1;
  98.         }
  99.  
  100.         ptr = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, *size);
  101.         CloseHandle(mh);
  102.         if (!ptr) {
  103.             av_log(&file_log_ctx, AV_LOG_ERROR, "Error occurred in MapViewOfFile()\n");
  104.             close(fd);
  105.             return -1;
  106.         }
  107.  
  108.         *bufptr = ptr;
  109.     }
  110. #else
  111.     *bufptr = av_malloc(*size);
  112.     if (!*bufptr) {
  113.         av_log(&file_log_ctx, AV_LOG_ERROR, "Memory allocation error occurred\n");
  114.         close(fd);
  115.         return AVERROR(ENOMEM);
  116.     }
  117.     read(fd, *bufptr, *size);
  118. #endif
  119.  
  120.     close(fd);
  121.     return 0;
  122. }
  123.  
  124. void av_file_unmap(uint8_t *bufptr, size_t size)
  125. {
  126. #if HAVE_MMAP
  127.     munmap(bufptr, size);
  128. #elif HAVE_MAPVIEWOFFILE
  129.     UnmapViewOfFile(bufptr);
  130. #else
  131.     av_free(bufptr);
  132. #endif
  133. }
  134.  
  135. int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx) {
  136.     FileLogContext file_log_ctx = { &file_log_ctx_class, log_offset, log_ctx };
  137.     int fd=-1;
  138. #if !HAVE_MKSTEMP
  139.     void *ptr= tempnam(NULL, prefix);
  140.     if(!ptr)
  141.         ptr= tempnam(".", prefix);
  142.     *filename = av_strdup(ptr);
  143. #undef free
  144.     free(ptr);
  145. #else
  146.     size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
  147.     *filename = av_malloc(len);
  148. #endif
  149.     /* -----common section-----*/
  150.     if (*filename == NULL) {
  151.         av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
  152.         return AVERROR(ENOMEM);
  153.     }
  154. #if !HAVE_MKSTEMP
  155. #   ifndef O_BINARY
  156. #       define O_BINARY 0
  157. #   endif
  158. #   ifndef O_EXCL
  159. #       define O_EXCL 0
  160. #   endif
  161.     fd = open(*filename, O_RDWR | O_BINARY | O_CREAT | O_EXCL, 0600);
  162. #else
  163.     snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
  164.     fd = mkstemp(*filename);
  165. #ifdef _WIN32
  166.     if (fd < 0) {
  167.         snprintf(*filename, len, "./%sXXXXXX", prefix);
  168.         fd = mkstemp(*filename);
  169.     }
  170. #endif
  171. #endif
  172.     /* -----common section-----*/
  173.     if (fd < 0) {
  174.         int err = AVERROR(errno);
  175.         av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
  176.         av_freep(filename);
  177.         return err;
  178.     }
  179.     return fd; /* success */
  180. }
  181.  
  182. #ifdef TEST
  183.  
  184. #undef printf
  185.  
  186. int main(void)
  187. {
  188.     uint8_t *buf;
  189.     size_t size;
  190.     if (av_file_map("file.c", &buf, &size, 0, NULL) < 0)
  191.         return 1;
  192.  
  193.     buf[0] = 's';
  194.     printf("%s", buf);
  195.     av_file_unmap(buf, size);
  196.     return 0;
  197. }
  198. #endif
  199.  
  200.