1/*---------------------------------------------------------------------------* 2 | PDFlib - A library for generating PDF on the fly | 3 +---------------------------------------------------------------------------+ 4 | Copyright (c) 1997-2004 Thomas Merz and PDFlib GmbH. All rights reserved. | 5 +---------------------------------------------------------------------------+ 6 | | 7 | This software is subject to the PDFlib license. It is NOT in the | 8 | public domain. Extended versions and commercial licenses are | 9 | available, please check http://www.pdflib.com. | 10 | | 11 *---------------------------------------------------------------------------*/ 12 13/* $Id: p_ccitt.c 14574 2005-10-29 16:27:43Z bonefish $ 14 * 15 * CCITT (Fax G3 and G4) processing for PDFlib 16 * 17 */ 18 19#include "p_intern.h" 20#include "p_image.h" 21 22/* 23 * Do a bit-reversal of all bytes in the buffer. 24 * This is supported for some clients which provide 25 * CCITT-compressed data in a byte-reversed format. 26 */ 27 28static void 29pdf_reverse_bit_order(unsigned char *buffer, size_t size) 30{ 31 size_t i; 32 33 /* table for fast byte reversal */ 34 static const pdc_byte reverse[256] = { 35 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 36 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 37 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 38 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 39 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 40 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 41 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 42 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 43 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 44 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 45 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 46 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 47 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 48 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 49 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 50 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 51 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 52 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 53 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 54 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 55 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 56 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 57 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 58 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 59 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 60 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 61 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 62 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 63 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 64 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 65 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 66 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff 67 }; 68 69 if (buffer != NULL) { 70 for (i = 0; i < size; i++) { 71 buffer[i] = reverse[buffer[i]]; 72 } 73 } 74} 75 76static void 77pdf_data_source_ccitt_raw_init(PDF *p, PDF_data_source *src) 78{ 79 (void) p; 80 81 src->bytes_available = 0; 82} 83 84static pdc_bool 85pdf_data_source_ccitt_raw_fill(PDF *p, PDF_data_source *src) 86{ 87 pdf_image *image; 88 pdc_bool ismem; 89 90 (void) p; 91 92 if (src->bytes_available) 93 return pdc_false; 94 95 image = (pdf_image *) src->private_data; 96 97 src->buffer_start = (pdc_byte *) 98 pdc_freadall(image->fp, (size_t *) &src->buffer_length, &ismem); 99 100 if (src->buffer_length == 0) 101 return pdc_false; 102 103 src->bytes_available = src->buffer_length; 104 src->next_byte = src->buffer_start; 105 106 if (image->info.ccitt.BitReverse) 107 pdf_reverse_bit_order(src->buffer_start, src->bytes_available); 108 109 if (ismem) 110 src->buffer_length = 0; 111 112 return pdc_true; 113} 114 115static void 116pdf_data_source_ccitt_raw_terminate(PDF *p, PDF_data_source *src) 117{ 118 if (src->buffer_length) 119 pdc_free(p->pdc, (void *) src->buffer_start); 120} 121 122static int 123pdf_process_ccitt_raw_data(PDF *p, int imageslot) 124{ 125 pdf_image *image = &p->images[imageslot]; 126 const char *stemp = NULL; 127 128 /* check data length for raw uncompressed images */ 129 if (image->compression == none && image->fp) 130 { 131 size_t length = pdc_file_size(image->fp); 132 if (length != (size_t)(image->height_pixel * 133 ((image->width_pixel * image->components * image->bpc + 7) / 8))) 134 { 135 stemp = pdc_errprintf(p->pdc, "%s", image->filename); 136 137 pdc_set_errmsg(p->pdc, PDF_E_RAW_ILLSIZE, 138 pdc_errprintf(p->pdc, "%d", length), stemp, 0, 0); 139 140 if (image->verbose) 141 pdc_error(p->pdc, -1, 0, 0, 0, 0); 142 143 return -1; 144 } 145 } 146 147 148 149 if (image->reference == pdf_ref_direct) 150 { 151 image->src.init = pdf_data_source_ccitt_raw_init; 152 image->src.fill = pdf_data_source_ccitt_raw_fill; 153 image->src.terminate = pdf_data_source_ccitt_raw_terminate; 154 image->src.private_data = (void *) image; 155 } 156 157 image->in_use = pdc_true; /* mark slot as used */ 158 159 if (image->doinline) 160 pdf_put_inline_image(p, imageslot); 161 else 162 pdf_put_image(p, imageslot, pdc_true); 163 164 return imageslot; 165} 166 167int 168pdf_process_CCITT_data(PDF *p, int imageslot) 169{ 170 pdf_image *image = &p->images[imageslot]; 171 172 /* CCITT specific information */ 173 image->info.ccitt.BitReverse = image->bitreverse; 174 image->compression = ccitt; 175 image->use_raw = pdc_true; 176 177 return pdf_process_ccitt_raw_data(p, imageslot); 178} 179 180int 181pdf_process_RAW_data(PDF *p, int imageslot) 182{ 183 pdf_image *image = &p->images[imageslot]; 184 185 /* RAW specific information */ 186 image->info.ccitt.BitReverse = 0; 187 image->compression = none; 188 189 return pdf_process_ccitt_raw_data(p, imageslot); 190} 191