/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks. Copyright (C) 2007-2018 by Jin-Hwan Cho and Shunsaku Hirata, the dvipdfmx project team. Copyright (C) 1998, 1999 by Mark A. Wicks This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* * Concatinating content streams are only supported for streams that only uses * single FlateDecode filter, i.e., * * /Filter /FlateDecode or /Filter [/FlateDecode] * * TrimBox, BleedBox, ArtBox, Rotate ... */ #ifdef HAVE_CONFIG_H #include #endif #include "system.h" #include "mem.h" #include "mfileio.h" #include "error.h" #include "dvipdfmx.h" #include "pdfobj.h" #include "pdfdev.h" #include "pdfdoc.h" #include "pdfdraw.h" #include "pdfparse.h" #include "pdfximage.h" #include "epdf.h" static pdf_obj* get_page_content (pdf_file *pf, pdf_obj* page) { pdf_obj *contents, *content_new; contents = pdf_deref_obj(pdf_lookup_dict(page, "Contents")); if (!contents) return NULL; if (PDF_OBJ_NULLTYPE(contents)) { /* empty page */ pdf_release_obj(contents); /* TODO: better don't include anything if the page is empty */ contents = pdf_new_stream(0); } else if (PDF_OBJ_ARRAYTYPE(contents)) { /* * Concatenate all content streams. */ pdf_obj *content_seg; int i; content_new = pdf_new_stream(STREAM_COMPRESS); for (i = 0; i < pdf_array_length(contents); i++) { content_seg = pdf_deref_obj(pdf_get_array(contents, i)); if (!content_seg) { WARN("Could not read page content stream."); pdf_release_obj(content_new); pdf_release_obj(contents); return NULL; } if (PDF_OBJ_STREAMTYPE(content_seg)) { pdf_concat_stream(content_new, content_seg); } else if (!PDF_OBJ_NULLTYPE(content_seg)) { WARN("Page content not a stream object. Broken PDF file?"); pdf_release_obj(content_seg); pdf_release_obj(content_new); pdf_release_obj(contents); return NULL; } pdf_release_obj(content_seg); } pdf_release_obj(contents); contents = content_new; } else { if (!PDF_OBJ_STREAMTYPE(contents)) { WARN("Page content not a stream object. Broken PDF file?"); pdf_release_obj(contents); return NULL; } /* Flate the contents if necessary. */ content_new = pdf_new_stream(STREAM_COMPRESS); pdf_concat_stream(content_new, contents); pdf_release_obj(contents); contents = content_new; } return contents; } /* ximage here is the result. DONT USE IT FOR PASSING OPTIONS! */ int pdf_include_page (pdf_ximage *ximage, FILE *image_file, const char *ident, load_options options) { pdf_file *pf; xform_info info; pdf_obj *contents = NULL, *catalog; pdf_obj *page = NULL, *resources = NULL, *markinfo = NULL; pf = pdf_open(ident, image_file); if (!pf) return -1; pdf_ximage_init_form_info(&info); if (options.page_no == 0) options.page_no = 1; page = pdf_doc_get_page(pf, options.page_no, options.bbox_type, &info.bbox, &info.matrix, &resources); if(!page) goto error_silent; catalog = pdf_file_get_catalog(pf); markinfo = pdf_deref_obj(pdf_lookup_dict(catalog, "MarkInfo")); if (markinfo) { pdf_obj *tmp = pdf_deref_obj(pdf_lookup_dict(markinfo, "Marked")); pdf_release_obj(markinfo); if (!PDF_OBJ_BOOLEANTYPE(tmp)) { if (tmp) pdf_release_obj(tmp); goto error; } else if (pdf_boolean_value(tmp)) { WARN("PDF file is tagged... Ignoring tags."); } pdf_release_obj(tmp); } /* * Handle page content stream. */ contents = get_page_content(pf, page); pdf_release_obj(page); page = NULL; /* * Add entries to contents stream dictionary. */ { pdf_obj *contents_dict, *bbox, *matrix; contents_dict = pdf_stream_dict(contents); pdf_add_dict(contents_dict, pdf_new_name("Type"), pdf_new_name("XObject")); pdf_add_dict(contents_dict, pdf_new_name("Subtype"), pdf_new_name("Form")); pdf_add_dict(contents_dict, pdf_new_name("FormType"), pdf_new_number(1.0)); bbox = pdf_new_array(); pdf_add_array(bbox, pdf_new_number(info.bbox.llx)); pdf_add_array(bbox, pdf_new_number(info.bbox.lly)); pdf_add_array(bbox, pdf_new_number(info.bbox.urx)); pdf_add_array(bbox, pdf_new_number(info.bbox.ury)); pdf_add_dict(contents_dict, pdf_new_name("BBox"), bbox); matrix = pdf_new_array(); pdf_add_array(matrix, pdf_new_number(info.matrix.a)); pdf_add_array(matrix, pdf_new_number(info.matrix.b)); pdf_add_array(matrix, pdf_new_number(info.matrix.c)); pdf_add_array(matrix, pdf_new_number(info.matrix.d)); pdf_add_array(matrix, pdf_new_number(info.matrix.e)); pdf_add_array(matrix, pdf_new_number(info.matrix.f)); pdf_add_dict(contents_dict, pdf_new_name("Matrix"), matrix); pdf_add_dict(contents_dict, pdf_new_name("Resources"), pdf_import_object(resources)); pdf_release_obj(resources); } pdf_close(pf); pdf_ximage_set_form(ximage, &info, contents); return 0; error: WARN("Cannot parse document. Broken PDF file?"); error_silent: if (resources) pdf_release_obj(resources); if (markinfo) pdf_release_obj(markinfo); if (page) pdf_release_obj(page); if (contents) pdf_release_obj(contents); pdf_close(pf); return -1; } typedef enum { OP_SETCOLOR = 1, OP_CLOSEandCLIP = 2, OP_CLIP = 3, OP_CONCATMATRIX = 4, OP_SETCOLORSPACE = 5, OP_RECTANGLE = 6, OP_CURVETO = 7, OP_CLOSEPATH = 8, OP_LINETO = 9, OP_MOVETO = 10, OP_NOOP = 11, OP_GSAVE = 12, OP_GRESTORE = 13, OP_CURVETO1 = 14, OP_CURVETO2 = 15, OP_UNKNOWN = 16 } pdf_opcode; static struct operator { const char *token; int opcode; } pdf_operators[] = { {"SCN", OP_SETCOLOR}, {"b*", OP_CLOSEandCLIP}, {"B*", OP_CLIP}, {"cm", OP_CONCATMATRIX}, {"CS", OP_SETCOLORSPACE}, {"f*", 0}, {"gs", -1}, {"re", OP_RECTANGLE}, {"rg", -3}, {"RG", -3}, {"sc", OP_SETCOLOR}, {"SC", OP_SETCOLOR}, {"W*", OP_CLIP}, {"b", OP_CLOSEandCLIP}, {"B", OP_CLIP}, {"c", OP_CURVETO}, {"d", -2}, {"f", 0}, {"F", 0}, {"g", -1}, {"G", -1}, {"h", OP_CLOSEPATH}, {"i", -1}, {"j", -1}, {"J", -1}, {"k", -4}, {"K", -4}, {"l", OP_LINETO}, {"m", OP_MOVETO}, {"M", -1}, {"n", OP_NOOP}, {"q", OP_GSAVE}, {"Q", OP_GRESTORE}, {"s", OP_CLOSEandCLIP}, {"S", OP_CLIP}, {"v", OP_CURVETO1}, {"w", -1}, {"W", OP_CLIP}, {"y", OP_CURVETO2} }; int pdf_copy_clip (FILE *image_file, int pageNo, double x_user, double y_user) { pdf_obj *page_tree, *contents; int depth = 0, top = -1; const char *clip_path, *end_path; char *save_path, *temp; pdf_tmatrix M; double stack[6]; pdf_rect bbox; pdf_tmatrix mtrx; pdf_file *pf; pf = pdf_open(NULL, image_file); if (!pf) return -1; pdf_dev_currentmatrix(&M); pdf_invertmatrix(&M); M.e += x_user; M.f += y_user; page_tree = pdf_doc_get_page(pf, pageNo, 0, &bbox, &mtrx, NULL); if (!page_tree) { pdf_close(pf); return -1; } contents = get_page_content(pf, page_tree); pdf_release_obj(page_tree); if (!contents) { pdf_close(pf); return -1; } pdf_doc_add_page_content(" ", 1); save_path = NEW(pdf_stream_length(contents) + 1, char); strncpy(save_path, (const char *) pdf_stream_dataptr(contents), pdf_stream_length(contents)); clip_path = save_path; end_path = clip_path + pdf_stream_length(contents); depth = 0; for (; clip_path < end_path; clip_path++) { int color_dimen = 0; /* silence uninitialized warning */ char *token; skip_white(&clip_path, end_path); if (clip_path == end_path) break; if (depth > 1) { if (*clip_path == 'q') depth++; if (*clip_path == 'Q') depth--; parse_ident(&clip_path, end_path); continue; } else if (*clip_path == '-' || *clip_path == '+' || *clip_path == '.' || isdigit((unsigned char)*clip_path)) { stack[++top] = strtod(clip_path, &temp); clip_path = temp; } else if (*clip_path == '[') { /* Ignore, but put a dummy value on the stack (in case of d operator) */ parse_pdf_array(&clip_path, end_path, pf); stack[++top] = 0; } else if (*clip_path == '/') { if (strncmp("/DeviceGray", clip_path, 11) == 0 || strncmp("/Indexed", clip_path, 8) == 0 || strncmp("/CalGray", clip_path, 8) == 0) { color_dimen = 1; continue; } else if (strncmp("/DeviceRGB", clip_path, 10) == 0 || strncmp("/CalRGB", clip_path, 7) == 0 || strncmp("/Lab", clip_path, 4) == 0) { color_dimen = 3; continue; } else if (strncmp("/DeviceCMYK", clip_path, 11) == 0) { color_dimen = 4; continue; } else { clip_path++; parse_ident(&clip_path, end_path); skip_white(&clip_path, end_path); token = parse_ident(&clip_path, end_path); if (strcmp(token, "gs") == 0) { continue; } return -1; } } else { int j; pdf_tmatrix T; pdf_coord p0, p1, p2, p3; token = parse_ident(&clip_path, end_path); for (j = 0; j < sizeof(pdf_operators) / sizeof(pdf_operators[0]); j++) if (strcmp(token, pdf_operators[j].token) == 0) break; if (j == sizeof(pdf_operators) / sizeof(pdf_operators[0])) { return -1; } switch (pdf_operators[j].opcode) { case 0: case -1: case -2: case -3: case -4: /* Just pop the stack and do nothing. */ top += pdf_operators[j].opcode; if (top < -1) return -1; break; case OP_SETCOLOR: top -= color_dimen; if (top < -1) return -1; break; case OP_CLOSEandCLIP: pdf_dev_closepath(); case OP_CLIP: #if 0 pdf_dev_clip(); #else pdf_dev_flushpath('W', PDF_FILL_RULE_NONZERO); #endif break; case OP_CONCATMATRIX: if (top < 5) return -1; T.f = stack[top--]; T.e = stack[top--]; T.d = stack[top--]; T.c = stack[top--]; T.b = stack[top--]; T.a = stack[top--]; pdf_concatmatrix(&M, &T); break; case OP_SETCOLORSPACE: /* Do nothing. */ break; case OP_RECTANGLE: if (top < 3) return -1; p1.y = stack[top--]; p1.x = stack[top--]; p0.y = stack[top--]; p0.x = stack[top--]; if (M.b == 0 && M.c == 0) { pdf_tmatrix M0; M0.a = M.a; M0.b = M.b; M0.c = M.c; M0.d = M.d; M0.e = 0; M0.f = 0; pdf_dev_transform(&p0, &M); pdf_dev_transform(&p1, &M0); pdf_dev_rectadd(p0.x, p0.y, p1.x, p1.y); } else { p2.x = p0.x + p1.x; p2.y = p0.y + p1.y; p3.x = p0.x; p3.y = p0.y + p1.y; p1.x += p0.x; p1.y = p0.y; pdf_dev_transform(&p0, &M); pdf_dev_transform(&p1, &M); pdf_dev_transform(&p2, &M); pdf_dev_transform(&p3, &M); pdf_dev_moveto(p0.x, p0.y); pdf_dev_lineto(p1.x, p1.y); pdf_dev_lineto(p2.x, p2.y); pdf_dev_lineto(p3.x, p3.y); pdf_dev_closepath(); } break; case OP_CURVETO: if (top < 5) return -1; p0.y = stack[top--]; p0.x = stack[top--]; pdf_dev_transform(&p0, &M); p1.y = stack[top--]; p1.x = stack[top--]; pdf_dev_transform(&p1, &M); p2.y = stack[top--]; p2.x = stack[top--]; pdf_dev_transform(&p2, &M); pdf_dev_curveto(p2.x, p2.y, p1.x, p1.y, p0.x, p0.y); break; case OP_CLOSEPATH: pdf_dev_closepath(); break; case OP_LINETO: if (top < 1) return -1; p0.y = stack[top--]; p0.x = stack[top--]; pdf_dev_transform(&p0, &M); pdf_dev_lineto(p0.x, p0.y); break; case OP_MOVETO: if (top < 1) return -1; p0.y = stack[top--]; p0.x = stack[top--]; pdf_dev_transform(&p0, &M); pdf_dev_moveto(p0.x, p0.y); break; case OP_NOOP: pdf_doc_add_page_content(" n", 2); break; case OP_GSAVE: depth++; break; case OP_GRESTORE: depth--; break; case OP_CURVETO1: if (top < 3) return -1; p0.y = stack[top--]; p0.x = stack[top--]; pdf_dev_transform(&p0, &M); p1.y = stack[top--]; p1.x = stack[top--]; pdf_dev_transform(&p1, &M); pdf_dev_vcurveto(p1.x, p1.y, p0.x, p0.y); break; case OP_CURVETO2: if (top < 3) return -1; p0.y = stack[top--]; p0.x = stack[top--]; pdf_dev_transform(&p0, &M); p1.y = stack[top--]; p1.x = stack[top--]; pdf_dev_transform(&p1, &M); pdf_dev_ycurveto(p1.x, p1.y, p0.x, p0.y); break; default: return -1; } } } RELEASE(save_path); pdf_release_obj(contents); pdf_close(pf); return 0; }