/*---------------------------------------------------------------------------* | PDFlib - A library for dynamically generating PDF files | +---------------------------------------------------------------------------+ | Copyright (c) 1997-1999 Thomas Merz. All rights reserved. | +---------------------------------------------------------------------------+ | This software is not in the public domain. It is subject to the | | "Aladdin Free Public License". See the file license.txt for details. | | This license grants you the right to use and redistribute PDFlib | | under certain conditions. Among other things, the license requires | | that the copyright notice and this notice be preserved on all copies. | | This requirement extends to ports to other programming languages. | | | | In short, you are allowed to develop and use PDFlib-based software | | as long as you don't sell it. Commercial use of PDFlib requires a | | commercial license which can be obtained from the author of PDFlib. | | Contact information can be found in the accompanying PDFlib manual. | | PDFlib is distributed with no warranty of any kind. Commercial users, | | however, will receive warranty and support statements in writing. | *---------------------------------------------------------------------------*/ /* p_ccitt.c * * CCITT (Fax G3 and G4) processing for PDFlib * */ #include #include #include "p_intern.h" #define CCITT_BUFSIZE 1024 /* * Do a bit-reversal of all bytes in the buffer. * This is supported for some clients which provide * CCITT-compressed data in a byte-reversed format. * The table-driven implementation was * provided by the customer who needed the feature. */ static void reverseBitOrder(byte *Buffer, size_t Size) { size_t i; /* table for fast byte reversal */ static const byte reverse[256] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff }; if (Buffer != NULL) { for (i = 0; i < Size; i++) { Buffer[i] = reverse[Buffer[i]]; } } } static void pdf_data_source_CCITT_init(PDF *p, PDF_data_source *src) { pdf_image *image; image = (pdf_image *) src->private_data; src->buffer_start = (byte *) p->malloc(p, CCITT_BUFSIZE, "PDF_data_source_CCITT_init"); src->buffer_length = CCITT_BUFSIZE; } static int pdf_data_source_CCITT_fill(PDF *p, PDF_data_source *src) { pdf_image *image; image = (pdf_image *) src->private_data; src->next_byte = src->buffer_start; src->bytes_available = fread(src->buffer_start, 1, CCITT_BUFSIZE, image->fp); if (src->bytes_available == 0) return pdf_false; if (image->image_info.ccitt.BitReverse) reverseBitOrder(src->buffer_start, src->bytes_available); return pdf_true; } static void pdf_data_source_CCITT_terminate(PDF *p, PDF_data_source *src) { p->free(p, (void *) src->buffer_start); } PDFLIB_API int PDFLIB_CALL PDF_open_CCITT(PDF *p, const char *filename, int width, int height, int BitReverse, int K, int BlackIs1) { pdf_image *image; int im; char scratch[30]; for (im = 0; im < p->images_capacity; im++) if (p->images[im].in_use == 0) /* found free slot */ break; if (im == p->images_capacity) pdf_grow_images(p); image = &p->images[im]; if ((image->fp = fopen(filename, READMODE)) == NULL) { return -1; } /* Grab the image parameters and pack them into image struct */ image->filename = pdf_strdup(p, filename); /* CCITT specific information */ image->width = width; image->height = height; image->image_info.ccitt.BitReverse = BitReverse; if (BlackIs1 == 0 && K == 0) /* default values */ image->image_info.ccitt.params = NULL; else { scratch[0] = '\0'; if (K != 0) { sprintf(scratch, "/K %d ", K); } if (BlackIs1 == 1) strcat(scratch, "/BlackIs1 true "); image->image_info.ccitt.params = pdf_strdup(p, scratch); } /* The following are fixed for CCITT images */ image->compression = ccitt; image->colorspace = DeviceGray; image->indexed = pdf_false; image->reference = pdf_ref_direct; image->components = 1; image->BitPixel = 1; image->bpc = 1; image->src.init = pdf_data_source_CCITT_init; image->src.fill = pdf_data_source_CCITT_fill; image->src.terminate = pdf_data_source_CCITT_terminate; image->src.private_data = (void *) image; image->in_use = 1; /* mark slot as used */ pdf_put_image(p, im); fclose(image->fp); return im; }