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245 lines
7.9 KiB
C
245 lines
7.9 KiB
C
/*
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* jcomapi.c
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*
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* Copyright (C) 1994-1997, Thomas G. Lane.
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* Modified 2019 by Guido Vollbeding.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains application interface routines that are used for both
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* compression and decompression.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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/*
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* Abort processing of a JPEG compression or decompression operation,
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* but don't destroy the object itself.
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*
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* For this, we merely clean up all the nonpermanent memory pools.
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* Note that temp files (virtual arrays) are not allowed to belong to
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* the permanent pool, so we will be able to close all temp files here.
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* Closing a data source or destination, if necessary, is the application's
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* responsibility.
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*/
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GLOBAL(void)
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jpeg_abort (j_common_ptr cinfo)
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{
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int pool;
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/* Do nothing if called on a not-initialized or destroyed JPEG object. */
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if (cinfo->mem == NULL)
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return;
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/* Releasing pools in reverse order might help avoid fragmentation
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* with some (brain-damaged) malloc libraries.
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*/
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for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
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(*cinfo->mem->free_pool) (cinfo, pool);
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}
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/* Reset overall state for possible reuse of object */
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if (cinfo->is_decompressor) {
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cinfo->global_state = DSTATE_START;
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/* Try to keep application from accessing now-deleted marker list.
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* A bit kludgy to do it here, but this is the most central place.
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*/
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((j_decompress_ptr) cinfo)->marker_list = NULL;
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} else {
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cinfo->global_state = CSTATE_START;
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}
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}
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/*
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* Destruction of a JPEG object.
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*
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* Everything gets deallocated except the master jpeg_compress_struct itself
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* and the error manager struct. Both of these are supplied by the application
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* and must be freed, if necessary, by the application. (Often they are on
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* the stack and so don't need to be freed anyway.)
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* Closing a data source or destination, if necessary, is the application's
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* responsibility.
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*/
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GLOBAL(void)
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jpeg_destroy (j_common_ptr cinfo)
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{
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/* We need only tell the memory manager to release everything. */
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/* NB: mem pointer is NULL if memory mgr failed to initialize. */
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if (cinfo->mem != NULL)
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(*cinfo->mem->self_destruct) (cinfo);
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cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
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cinfo->global_state = 0; /* mark it destroyed */
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}
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/*
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* Convenience routines for allocating quantization and Huffman tables.
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* (Would jutils.c be a more reasonable place to put these?)
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*/
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GLOBAL(JQUANT_TBL *)
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jpeg_alloc_quant_table (j_common_ptr cinfo)
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{
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JQUANT_TBL *tbl;
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tbl = (JQUANT_TBL *)
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(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
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tbl->sent_table = FALSE; /* make sure this is false in any new table */
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return tbl;
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}
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GLOBAL(JHUFF_TBL *)
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jpeg_alloc_huff_table (j_common_ptr cinfo)
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{
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JHUFF_TBL *tbl;
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tbl = (JHUFF_TBL *)
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(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
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tbl->sent_table = FALSE; /* make sure this is false in any new table */
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return tbl;
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}
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/*
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* Set up the standard Huffman tables (cf. JPEG standard section K.3).
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* IMPORTANT: these are only valid for 8-bit data precision!
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* (Would jutils.c be a more reasonable place to put this?)
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*/
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GLOBAL(JHUFF_TBL *)
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jpeg_std_huff_table (j_common_ptr cinfo, boolean isDC, int tblno)
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{
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JHUFF_TBL **htblptr, *htbl;
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const UINT8 *bits, *val;
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int nsymbols, len;
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static const UINT8 bits_dc_luminance[17] =
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{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
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static const UINT8 val_dc_luminance[] =
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
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static const UINT8 bits_dc_chrominance[17] =
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{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
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static const UINT8 val_dc_chrominance[] =
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
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static const UINT8 bits_ac_luminance[17] =
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{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
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static const UINT8 val_ac_luminance[] =
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{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa };
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static const UINT8 bits_ac_chrominance[17] =
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{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
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static const UINT8 val_ac_chrominance[] =
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{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa };
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if (cinfo->is_decompressor) {
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if (isDC)
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htblptr = ((j_decompress_ptr) cinfo)->dc_huff_tbl_ptrs;
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else
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htblptr = ((j_decompress_ptr) cinfo)->ac_huff_tbl_ptrs;
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} else {
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if (isDC)
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htblptr = ((j_compress_ptr) cinfo)->dc_huff_tbl_ptrs;
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else
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htblptr = ((j_compress_ptr) cinfo)->ac_huff_tbl_ptrs;
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}
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switch (tblno) {
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case 0:
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if (isDC) {
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bits = bits_dc_luminance;
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val = val_dc_luminance;
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} else {
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bits = bits_ac_luminance;
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val = val_ac_luminance;
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}
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break;
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case 1:
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if (isDC) {
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bits = bits_dc_chrominance;
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val = val_dc_chrominance;
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} else {
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bits = bits_ac_chrominance;
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val = val_ac_chrominance;
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}
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break;
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default:
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ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);
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return NULL; /* avoid compiler warnings for uninitialized variables */
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}
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if (htblptr[tblno] == NULL)
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htblptr[tblno] = jpeg_alloc_huff_table(cinfo);
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htbl = htblptr[tblno];
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/* Copy the number-of-symbols-of-each-code-length counts */
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MEMCOPY(htbl->bits, bits, SIZEOF(htbl->bits));
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/* Validate the counts. We do this here mainly so we can copy the right
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* number of symbols from the val[] array, without risking marching off
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* the end of memory. jxhuff.c will do a more thorough test later.
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*/
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nsymbols = 0;
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for (len = 1; len <= 16; len++)
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nsymbols += bits[len];
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if (nsymbols > 256)
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ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
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if (nsymbols > 0)
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MEMCOPY(htbl->huffval, val, nsymbols * SIZEOF(UINT8));
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/* Initialize sent_table FALSE so table will be written to JPEG file. */
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htbl->sent_table = FALSE;
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return htbl;
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}
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