text: /*
   * jcomapi.c
   *
   * Copyright (C) 1994-1997, Thomas G. Lane.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains application interface routines that are used for both
   * compression and decompression.
   */
  #include "stdafx.h"
  
  #define JPEG_INTERNALS
  //#include "jinclude.h"
  //#include "jpeglib.h"
  
  
  /*
   * Abort processing of a JPEG compression or decompression operation,
   * but don't destroy the object itself.
   *
   * For this, we merely clean up all the nonpermanent memory pools.
   * Note that temp files (virtual arrays) are not allowed to belong to
   * the permanent pool, so we will be able to close all temp files here.
   * Closing a data source or destination, if necessary, is the application's
   * responsibility.
   */
  
  GLOBAL(void)
  jpeg_abort (j_common_ptr cinfo)
  {
    int pool;
  
    /* Do nothing if called on a not-initialized or destroyed JPEG object. */
    if (cinfo->mem == NULL)
      return;
  
    /* Releasing pools in reverse order might help avoid fragmentation
     * with some (brain-damaged) malloc libraries.
     */
    for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
      (*cinfo->mem->free_pool) (cinfo, pool);
    }
  
    /* Reset overall state for possible reuse of object */
    if (cinfo->is_decompressor) {
      cinfo->global_state = DSTATE_START;
      /* Try to keep application from accessing now-deleted marker list.
       * A bit kludgy to do it here, but this is the most central place.
       */
      ((j_decompress_ptr) cinfo)->marker_list = NULL;
    } else {
      cinfo->global_state = CSTATE_START;
    }
  }
  
  
  /*
   * Destruction of a JPEG object.
   *
   * Everything gets deallocated except the master jpeg_compress_struct itself
   * and the error manager struct.  Both of these are supplied by the application
   * and must be freed, if necessary, by the application.  (Often they are on
   * the stack and so don't need to be freed anyway.)
   * Closing a data source or destination, if necessary, is the application's
   * responsibility.
   */
  
  GLOBAL(void)
  jpeg_destroy (j_common_ptr cinfo)
  {
    /* We need only tell the memory manager to release everything. */
    /* NB: mem pointer is NULL if memory mgr failed to initialize. */
    if (cinfo->mem != NULL)
      (*cinfo->mem->self_destruct) (cinfo);
    cinfo->mem = NULL;		/* be safe if jpeg_destroy is called twice */
    cinfo->global_state = 0;	/* mark it destroyed */
  }
  
  
  /*
   * Convenience routines for allocating quantization and Huffman tables.
   * (Would jutils.c be a more reasonable place to put these?)
   */
  
  GLOBAL(JQUANT_TBL *)
  jpeg_alloc_quant_table (j_common_ptr cinfo)
  {
    JQUANT_TBL *tbl;
  
    tbl = (JQUANT_TBL *)
      (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
    tbl->sent_table = FALSE;	/* make sure this is false in any new table */
    return tbl;
  }
  
  
  GLOBAL(JHUFF_TBL *)
  jpeg_alloc_huff_table (j_common_ptr cinfo)
  {
    JHUFF_TBL *tbl;
  
    tbl = (JHUFF_TBL *)
      (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
    tbl->sent_table = FALSE;	/* make sure this is false in any new table */
    return tbl;
  }
  