1f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org/* 2f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * jcomapi.c 3f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * 4f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Copyright (C) 1994-1997, Thomas G. Lane. 5f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * This file is part of the Independent JPEG Group's software. 6f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * For conditions of distribution and use, see the accompanying README file. 7f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * 8f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * This file contains application interface routines that are used for both 9f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * compression and decompression. 10f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org */ 11f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 12f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#define JPEG_INTERNALS 13f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "jinclude.h" 14f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "jpeglib.h" 15f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 16f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 17f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org/* 18f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Abort processing of a JPEG compression or decompression operation, 19f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * but don't destroy the object itself. 20f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * 21f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * For this, we merely clean up all the nonpermanent memory pools. 22f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Note that temp files (virtual arrays) are not allowed to belong to 23f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * the permanent pool, so we will be able to close all temp files here. 24f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Closing a data source or destination, if necessary, is the application's 25f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * responsibility. 26f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org */ 27f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 28f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgGLOBAL(void) 29f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgjpeg_abort (j_common_ptr cinfo) 30f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org{ 31f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org int pool; 32f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 33f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org /* Do nothing if called on a not-initialized or destroyed JPEG object. */ 34f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (cinfo->mem == NULL) 35f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return; 36f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 37f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org /* Releasing pools in reverse order might help avoid fragmentation 38f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * with some (brain-damaged) malloc libraries. 39f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org */ 40f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) { 41f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org (*cinfo->mem->free_pool) (cinfo, pool); 42f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } 43f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 44f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org /* Reset overall state for possible reuse of object */ 45f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (cinfo->is_decompressor) { 46f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org cinfo->global_state = DSTATE_START; 47f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org /* Try to keep application from accessing now-deleted marker list. 48f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * A bit kludgy to do it here, but this is the most central place. 49f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org */ 50f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org ((j_decompress_ptr) cinfo)->marker_list = NULL; 51f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } else { 52f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org cinfo->global_state = CSTATE_START; 53f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } 54f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 55f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 56f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 57f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org/* 58f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Destruction of a JPEG object. 59f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * 60f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Everything gets deallocated except the master jpeg_compress_struct itself 61f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * and the error manager struct. Both of these are supplied by the application 62f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * and must be freed, if necessary, by the application. (Often they are on 63f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * the stack and so don't need to be freed anyway.) 64f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Closing a data source or destination, if necessary, is the application's 65f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * responsibility. 66f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org */ 67f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 68f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgGLOBAL(void) 69f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgjpeg_destroy (j_common_ptr cinfo) 70f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org{ 71f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org /* We need only tell the memory manager to release everything. */ 72f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org /* NB: mem pointer is NULL if memory mgr failed to initialize. */ 73f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (cinfo->mem != NULL) 74f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org (*cinfo->mem->self_destruct) (cinfo); 75f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */ 76f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org cinfo->global_state = 0; /* mark it destroyed */ 77f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 78f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 79f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 80f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org/* 81f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * Convenience routines for allocating quantization and Huffman tables. 82f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org * (Would jutils.c be a more reasonable place to put these?) 83f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org */ 84f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 85f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgGLOBAL(JQUANT_TBL *) 86f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgjpeg_alloc_quant_table (j_common_ptr cinfo) 87f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org{ 88f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org JQUANT_TBL *tbl; 89f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 90f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org tbl = (JQUANT_TBL *) 91f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL)); 92f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org tbl->sent_table = FALSE; /* make sure this is false in any new table */ 93f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return tbl; 94f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 95f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 96f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 97f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgGLOBAL(JHUFF_TBL *) 98f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgjpeg_alloc_huff_table (j_common_ptr cinfo) 99f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org{ 100f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org JHUFF_TBL *tbl; 101f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 102f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org tbl = (JHUFF_TBL *) 103f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL)); 104f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org tbl->sent_table = FALSE; /* make sure this is false in any new table */ 105f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return tbl; 106f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 107