/* * 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. */ #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;}