170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jcomapi.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1994-1997, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file contains application interface routines that are used for both 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * compression and decompression. 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Abort processing of a JPEG compression or decompression operation, 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * but don't destroy the object itself. 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For this, we merely clean up all the nonpermanent memory pools. 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Note that temp files (virtual arrays) are not allowed to belong to 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the permanent pool, so we will be able to close all temp files here. 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Closing a data source or destination, if necessary, is the application's 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * responsibility. 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_abort (j_common_ptr cinfo) 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int pool; 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Do nothing if called on a not-initialized or destroyed JPEG object. */ 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->mem == NULL) 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return; 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Releasing pools in reverse order might help avoid fragmentation 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * with some (brain-damaged) malloc libraries. 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) { 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->free_pool) (cinfo, pool); 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Reset overall state for possible reuse of object */ 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->is_decompressor) { 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_START; 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Try to keep application from accessing now-deleted marker list. 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * A bit kludgy to do it here, but this is the most central place. 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ((j_decompress_ptr) cinfo)->marker_list = NULL; 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = CSTATE_START; 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Destruction of a JPEG object. 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Everything gets deallocated except the master jpeg_compress_struct itself 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and the error manager struct. Both of these are supplied by the application 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and must be freed, if necessary, by the application. (Often they are on 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the stack and so don't need to be freed anyway.) 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Closing a data source or destination, if necessary, is the application's 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * responsibility. 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_destroy (j_common_ptr cinfo) 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We need only tell the memory manager to release everything. */ 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* NB: mem pointer is NULL if memory mgr failed to initialize. */ 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->mem != NULL) 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->self_destruct) (cinfo); 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */ 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = 0; /* mark it destroyed */ 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Convenience routines for allocating quantization and Huffman tables. 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * (Would jutils.c be a more reasonable place to put these?) 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(JQUANT_TBL *) 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_alloc_quant_table (j_common_ptr cinfo) 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JQUANT_TBL *tbl; 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl = (JQUANT_TBL *) 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL)); 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl->sent_table = FALSE; /* make sure this is false in any new table */ 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return tbl; 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(JHUFF_TBL *) 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_alloc_huff_table (j_common_ptr cinfo) 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JHUFF_TBL *tbl; 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl = (JHUFF_TBL *) 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL)); 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl->sent_table = FALSE; /* make sure this is false in any new table */ 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return tbl; 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 107