Update libjpeg_turbo to 1.4.90 from https://github.com/libjpeg-turbo/

jdatasrc-tj.c

 /*
  * jdatasrc-tj.c
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1994-1996, Thomas G. Lane.
  * Modified 2009-2011 by Guido Vollbeding.
  * libjpeg-turbo Modifications:
  * Copyright (C) 2011, D. R. Commander.
- * For conditions of distribution and use, see the accompanying README file.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
  *
  * This file contains decompression data source routines for the case of
  * reading JPEG data from memory or from a file (or any stdio stream).
  * While these routines are sufficient for most applications,
  * some will want to use a different source manager.
  * IMPORTANT: we assume that fread() will correctly transcribe an array of
  * JOCTETs from 8-bit-wide elements on external storage.  If char is wider
  * than 8 bits on your machine, you may need to do some tweaking.
  */
 
@@ skipping 78 matching lines @@
  * is not granted the right to give a suspension return.  If the skip extends
  * beyond the data currently in the buffer, the buffer can be marked empty so
  * that the next read will cause a fill_input_buffer call that can suspend.
  * Arranging for additional bytes to be discarded before reloading the input
  * buffer is the application writer's problem.
  */
 
 METHODDEF(void)
 skip_input_data (j_decompress_ptr cinfo, long num_bytes)
 {
-  struct jpeg_source_mgr * src = cinfo->src;
+  struct jpeg_source_mgr *src = cinfo->src;
 
   /* Just a dumb implementation for now.  Could use fseek() except
    * it doesn't work on pipes.  Not clear that being smart is worth
    * any trouble anyway --- large skips are infrequent.
    */
   if (num_bytes > 0) {
     while (num_bytes > (long) src->bytes_in_buffer) {
       num_bytes -= (long) src->bytes_in_buffer;
       (void) (*src->fill_input_buffer) (cinfo);
       /* note we assume that fill_input_buffer will never return FALSE,
@@ skipping 31 matching lines @@
 }
 
 
 /*
  * Prepare for input from a supplied memory buffer.
  * The buffer must contain the whole JPEG data.
  */
 
 GLOBAL(void)
 jpeg_mem_src_tj (j_decompress_ptr cinfo,
-              unsigned char * inbuffer, unsigned long insize)
+                 const unsigned char *inbuffer, unsigned long insize)
 {
-  struct jpeg_source_mgr * src;
+  struct jpeg_source_mgr *src;
 
-  if (inbuffer == NULL || insize == 0)  /* Treat empty input as fatal error */
+  if (inbuffer == NULL || insize == 0)  /* Treat empty input as fatal error */
     ERREXIT(cinfo, JERR_INPUT_EMPTY);
 
   /* The source object is made permanent so that a series of JPEG images
    * can be read from the same buffer by calling jpeg_mem_src only before
    * the first one.
    */
-  if (cinfo->src == NULL) {     /* first time for this JPEG object? */
+  if (cinfo->src == NULL) {     /* first time for this JPEG object? */
     cinfo->src = (struct jpeg_source_mgr *)
       (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
-                                  SIZEOF(struct jpeg_source_mgr));
+                                  sizeof(struct jpeg_source_mgr));
   }
 
   src = cinfo->src;
   src->init_source = init_mem_source;
   src->fill_input_buffer = fill_mem_input_buffer;
   src->skip_input_data = skip_input_data;
   src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
   src->term_source = term_source;
   src->bytes_in_buffer = (size_t) insize;
-  src->next_input_byte = (JOCTET *) inbuffer;
+  src->next_input_byte = (const JOCTET *) inbuffer;
 }