michael@0: /*
michael@0: * jstdhuff.c
michael@0: *
michael@0: * This file was part of the Independent JPEG Group's software:
michael@0: * Copyright (C) 1991-1998, Thomas G. Lane.
michael@0: * libjpeg-turbo Modifications:
michael@0: * Copyright (C) 2013, D. R. Commander.
michael@0: * For conditions of distribution and use, see the accompanying README file.
michael@0: *
michael@0: * This file contains routines to set the default Huffman tables, if they are
michael@0: * not already set.
michael@0: */
michael@0: 
michael@0: /*
michael@0:  * Huffman table setup routines
michael@0:  */
michael@0: 
michael@0: LOCAL(void)
michael@0: add_huff_table (j_common_ptr cinfo,
michael@0: 		JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
michael@0: /* Define a Huffman table */
michael@0: {
michael@0:   int nsymbols, len;
michael@0: 
michael@0:   if (*htblptr == NULL)
michael@0:     *htblptr = jpeg_alloc_huff_table(cinfo);
michael@0:   else
michael@0:     return;
michael@0: 
michael@0:   /* Copy the number-of-symbols-of-each-code-length counts */
michael@0:   MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
michael@0: 
michael@0:   /* Validate the counts.  We do this here mainly so we can copy the right
michael@0:    * number of symbols from the val[] array, without risking marching off
michael@0:    * the end of memory.  jchuff.c will do a more thorough test later.
michael@0:    */
michael@0:   nsymbols = 0;
michael@0:   for (len = 1; len <= 16; len++)
michael@0:     nsymbols += bits[len];
michael@0:   if (nsymbols < 1 || nsymbols > 256)
michael@0:     ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
michael@0: 
michael@0:   MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));
michael@0: 
michael@0:   /* Initialize sent_table FALSE so table will be written to JPEG file. */
michael@0:   (*htblptr)->sent_table = FALSE;
michael@0: }
michael@0: 
michael@0: 
michael@0: LOCAL(void)
michael@0: std_huff_tables (j_common_ptr cinfo)
michael@0: /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
michael@0: /* IMPORTANT: these are only valid for 8-bit data precision! */
michael@0: {
michael@0:   JHUFF_TBL **dc_huff_tbl_ptrs, **ac_huff_tbl_ptrs;
michael@0: 
michael@0:   static const UINT8 bits_dc_luminance[17] =
michael@0:     { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
michael@0:   static const UINT8 val_dc_luminance[] =
michael@0:     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
michael@0: 
michael@0:   static const UINT8 bits_dc_chrominance[17] =
michael@0:     { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
michael@0:   static const UINT8 val_dc_chrominance[] =
michael@0:     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
michael@0: 
michael@0:   static const UINT8 bits_ac_luminance[17] =
michael@0:     { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
michael@0:   static const UINT8 val_ac_luminance[] =
michael@0:     { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
michael@0:       0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
michael@0:       0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
michael@0:       0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
michael@0:       0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
michael@0:       0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
michael@0:       0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
michael@0:       0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
michael@0:       0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
michael@0:       0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
michael@0:       0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
michael@0:       0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
michael@0:       0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
michael@0:       0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
michael@0:       0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
michael@0:       0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
michael@0:       0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
michael@0:       0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
michael@0:       0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
michael@0:       0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
michael@0:       0xf9, 0xfa };
michael@0: 
michael@0:   static const UINT8 bits_ac_chrominance[17] =
michael@0:     { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
michael@0:   static const UINT8 val_ac_chrominance[] =
michael@0:     { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
michael@0:       0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
michael@0:       0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
michael@0:       0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
michael@0:       0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
michael@0:       0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
michael@0:       0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
michael@0:       0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
michael@0:       0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
michael@0:       0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
michael@0:       0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
michael@0:       0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
michael@0:       0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
michael@0:       0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
michael@0:       0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
michael@0:       0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
michael@0:       0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
michael@0:       0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
michael@0:       0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
michael@0:       0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
michael@0:       0xf9, 0xfa };
michael@0: 
michael@0:   if (cinfo->is_decompressor) {
michael@0:     dc_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->dc_huff_tbl_ptrs;
michael@0:     ac_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->ac_huff_tbl_ptrs;
michael@0:   } else {
michael@0:     dc_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->dc_huff_tbl_ptrs;
michael@0:     ac_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->ac_huff_tbl_ptrs;
michael@0:   }
michael@0: 
michael@0:   add_huff_table(cinfo, &dc_huff_tbl_ptrs[0], bits_dc_luminance,
michael@0:                  val_dc_luminance);
michael@0:   add_huff_table(cinfo, &ac_huff_tbl_ptrs[0], bits_ac_luminance,
michael@0:                  val_ac_luminance);
michael@0:   add_huff_table(cinfo, &dc_huff_tbl_ptrs[1], bits_dc_chrominance,
michael@0:                  val_dc_chrominance);
michael@0:   add_huff_table(cinfo, &ac_huff_tbl_ptrs[1], bits_ac_chrominance,
michael@0:                  val_ac_chrominance);
michael@0: }