kc3-lang/libjpeg-turbo/jmemnobs.c

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• Hash : 9fc018fd
  Author :
  Date : 2020-01-12T00:00:00
  

  The Independent JPEG Group's JPEG software v9d
  

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• jmemnobs.c

• /*
   * jmemnobs.c
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1992-1996, Thomas G. Lane.
   * libjpeg-turbo Modifications:
   * Copyright (C) 2017-2018, D. R. Commander.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file provides a really simple implementation of the system-
   * dependent portion of the JPEG memory manager.  This implementation
   * assumes that no backing-store files are needed: all required space
   * can be obtained from malloc().
   * This is very portable in the sense that it'll compile on almost anything,
   * but you'd better have lots of main memory (or virtual memory) if you want
   * to process big images.
   */
  
  #define JPEG_INTERNALS
  #include "jinclude.h"
  #include "jpeglib.h"
  #include "jmemsys.h"            /* import the system-dependent declarations */
  
  #ifndef HAVE_STDLIB_H           /* <stdlib.h> should declare malloc(),free() */
  extern void *malloc(size_t size);
  extern void free(void *ptr);
  #endif
  
  
  /*
   * Memory allocation and freeing are controlled by the regular library
   * routines malloc() and free().
   */
  
  GLOBAL(void *)
  jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject)
  {
    return (void *)malloc(sizeofobject);
  }
  
  GLOBAL(void)
  jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject)
  {
    free(object);
  }
  
  
  /*
   * "Large" objects are treated the same as "small" ones.
   */
  
  GLOBAL(void *)
  jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject)
  {
    return (void *)malloc(sizeofobject);
  }
  
  GLOBAL(void)
  jpeg_free_large(j_common_ptr cinfo, void *object, size_t sizeofobject)
  {
    free(object);
  }
  
  
  /*
   * This routine computes the total memory space available for allocation.
   */
  
  GLOBAL(size_t)
  jpeg_mem_available(j_common_ptr cinfo, size_t min_bytes_needed,
                     size_t max_bytes_needed, size_t already_allocated)
  {
    if (cinfo->mem->max_memory_to_use) {
      if ((size_t)cinfo->mem->max_memory_to_use > already_allocated)
        return cinfo->mem->max_memory_to_use - already_allocated;
      else
        return 0;
    } else {
      /* Here we always say, "we got all you want bud!" */
      return max_bytes_needed;
    }
  }
  
  
  /*
   * Backing store (temporary file) management.
   * Since jpeg_mem_available always promised the moon,
   * this should never be called and we can just error out.
   */
  
  GLOBAL(void)
  jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info,
                          long total_bytes_needed)
  {
    ERREXIT(cinfo, JERR_NO_BACKING_STORE);
  }
  
  
  /*
   * These routines take care of any system-dependent initialization and
   * cleanup required.  Here, there isn't any.
   */
  
  GLOBAL(long)
  jpeg_mem_init(j_common_ptr cinfo)
  {
    return 0;                     /* just set max_memory_to_use to 0 */
  }
  
  GLOBAL(void)
  jpeg_mem_term(j_common_ptr cinfo)
  {
    /* no work */
  }
  

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