Implement cmdutils.c:read_file(), and use it in ffmpeg.c for reading

the second pass encoding log file.

Originally committed as revision 22769 to svn://svn.ffmpeg.org/ffmpeg/trunk

cmdutils.c

@@ -639,3 +639,27 @@ int read_yesno(void)
 
     return yesno;
 }
+
+int read_file(const char *filename, char **bufptr, size_t *size)
+{
+    FILE *f = fopen(filename, "r");
+
+    if (!f) {
+        fprintf(stderr, "Cannot read file '%s': %s\n", filename, strerror(errno));
+        return AVERROR(errno);
+    }
+    fseek(f, 0, SEEK_END);
+    *size = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    *bufptr = av_malloc(*size + 1);
+    if (!*bufptr) {
+        fprintf(stderr, "Could not allocate file buffer\n");
+        fclose(f);
+        return AVERROR(ENOMEM);
+    }
+    fread(*bufptr, 1, *size, f);
+    (*bufptr)[*size++] = '\0';
+
+    fclose(f);
+    return 0;
+}

cmdutils.h

@@ -200,4 +200,15 @@ void show_pix_fmts(void);
  */
 int read_yesno(void);
 
+/**
+ * Reads the file with name filename, and puts its content in a newly
+ * allocated 0-terminated buffer.
+ *
+ * @param bufptr puts here the pointer to the newly allocated buffer
+ * @param size puts here the size of the newly allocated buffer
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR error code in case of failure.
+ */
+int read_file(const char *filename, char **bufptr, size_t *size);
+
 #endif /* FFMPEG_CMDUTILS_H */

ffmpeg.c

@@ -2072,8 +2072,6 @@ static int av_encode(AVFormatContext **output_files,
                 (codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
                 char logfilename[1024];
                 FILE *f;
-                int size;
-                char *logbuffer;
 
                 snprintf(logfilename, sizeof(logfilename), "%s-%d.log",
                          pass_logfilename_prefix ? pass_logfilename_prefix : DEFAULT_PASS_LOGFILENAME_PREFIX,
@@ -2086,23 +2084,12 @@ static int av_encode(AVFormatContext **output_files,
                     }
                     ost->logfile = f;
                 } else {
-                    /* read the log file */
-                    f = fopen(logfilename, "r");
-                    if (!f) {
-                        fprintf(stderr, "Cannot read log file '%s' for pass-2 encoding: %s\n", logfilename, strerror(errno));
-                        av_exit(1);
-                    }
-                    fseek(f, 0, SEEK_END);
-                    size = ftell(f);
-                    fseek(f, 0, SEEK_SET);
-                    logbuffer = av_malloc(size + 1);
-                    if (!logbuffer) {
-                        fprintf(stderr, "Could not allocate log buffer\n");
+                    char  *logbuffer;
+                    size_t logbuffer_size;
+                    if (read_file(logfilename, &logbuffer, &logbuffer_size) < 0) {
+                        fprintf(stderr, "Error reading log file '%s' for pass-2 encoding\n", logfilename);
                         av_exit(1);
                     }
-                    size = fread(logbuffer, 1, size, f);
-                    fclose(f);
-                    logbuffer[size] = '\0';
                     codec->stats_in = logbuffer;
                 }
             }