1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/libjpeg/jcomapi.c	Thu Sep 08 06:28:38 2011 +0300
     1.3 @@ -0,0 +1,106 @@
     1.4 +/*
     1.5 + * jcomapi.c
     1.6 + *
     1.7 + * Copyright (C) 1994-1997, Thomas G. Lane.
     1.8 + * This file is part of the Independent JPEG Group's software.
     1.9 + * For conditions of distribution and use, see the accompanying README file.
    1.10 + *
    1.11 + * This file contains application interface routines that are used for both
    1.12 + * compression and decompression.
    1.13 + */
    1.14 +
    1.15 +#define JPEG_INTERNALS
    1.16 +#include "jinclude.h"
    1.17 +#include "jpeglib.h"
    1.18 +
    1.19 +
    1.20 +/*
    1.21 + * Abort processing of a JPEG compression or decompression operation,
    1.22 + * but don't destroy the object itself.
    1.23 + *
    1.24 + * For this, we merely clean up all the nonpermanent memory pools.
    1.25 + * Note that temp files (virtual arrays) are not allowed to belong to
    1.26 + * the permanent pool, so we will be able to close all temp files here.
    1.27 + * Closing a data source or destination, if necessary, is the application's
    1.28 + * responsibility.
    1.29 + */
    1.30 +
    1.31 +GLOBAL(void)
    1.32 +jpeg_abort (j_common_ptr cinfo)
    1.33 +{
    1.34 +  int pool;
    1.35 +
    1.36 +  /* Do nothing if called on a not-initialized or destroyed JPEG object. */
    1.37 +  if (cinfo->mem == NULL)
    1.38 +    return;
    1.39 +
    1.40 +  /* Releasing pools in reverse order might help avoid fragmentation
    1.41 +   * with some (brain-damaged) malloc libraries.
    1.42 +   */
    1.43 +  for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
    1.44 +    (*cinfo->mem->free_pool) (cinfo, pool);
    1.45 +  }
    1.46 +
    1.47 +  /* Reset overall state for possible reuse of object */
    1.48 +  if (cinfo->is_decompressor) {
    1.49 +    cinfo->global_state = DSTATE_START;
    1.50 +    /* Try to keep application from accessing now-deleted marker list.
    1.51 +     * A bit kludgy to do it here, but this is the most central place.
    1.52 +     */
    1.53 +    ((j_decompress_ptr) cinfo)->marker_list = NULL;
    1.54 +  } else {
    1.55 +    cinfo->global_state = CSTATE_START;
    1.56 +  }
    1.57 +}
    1.58 +
    1.59 +
    1.60 +/*
    1.61 + * Destruction of a JPEG object.
    1.62 + *
    1.63 + * Everything gets deallocated except the master jpeg_compress_struct itself
    1.64 + * and the error manager struct.  Both of these are supplied by the application
    1.65 + * and must be freed, if necessary, by the application.  (Often they are on
    1.66 + * the stack and so don't need to be freed anyway.)
    1.67 + * Closing a data source or destination, if necessary, is the application's
    1.68 + * responsibility.
    1.69 + */
    1.70 +
    1.71 +GLOBAL(void)
    1.72 +jpeg_destroy (j_common_ptr cinfo)
    1.73 +{
    1.74 +  /* We need only tell the memory manager to release everything. */
    1.75 +  /* NB: mem pointer is NULL if memory mgr failed to initialize. */
    1.76 +  if (cinfo->mem != NULL)
    1.77 +    (*cinfo->mem->self_destruct) (cinfo);
    1.78 +  cinfo->mem = NULL;		/* be safe if jpeg_destroy is called twice */
    1.79 +  cinfo->global_state = 0;	/* mark it destroyed */
    1.80 +}
    1.81 +
    1.82 +
    1.83 +/*
    1.84 + * Convenience routines for allocating quantization and Huffman tables.
    1.85 + * (Would jutils.c be a more reasonable place to put these?)
    1.86 + */
    1.87 +
    1.88 +GLOBAL(JQUANT_TBL *)
    1.89 +jpeg_alloc_quant_table (j_common_ptr cinfo)
    1.90 +{
    1.91 +  JQUANT_TBL *tbl;
    1.92 +
    1.93 +  tbl = (JQUANT_TBL *)
    1.94 +    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
    1.95 +  tbl->sent_table = FALSE;	/* make sure this is false in any new table */
    1.96 +  return tbl;
    1.97 +}
    1.98 +
    1.99 +
   1.100 +GLOBAL(JHUFF_TBL *)
   1.101 +jpeg_alloc_huff_table (j_common_ptr cinfo)
   1.102 +{
   1.103 +  JHUFF_TBL *tbl;
   1.104 +
   1.105 +  tbl = (JHUFF_TBL *)
   1.106 +    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
   1.107 +  tbl->sent_table = FALSE;	/* make sure this is false in any new table */
   1.108 +  return tbl;
   1.109 +}