453 lines
18 KiB
C
453 lines
18 KiB
C
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// Copyright (C) 2004-2023 Artifex Software, Inc.
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//
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// This file is part of MuPDF.
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//
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// MuPDF is free software: you can redistribute it and/or modify it under the
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// terms of the GNU Affero General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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// details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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//
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// Alternative licensing terms are available from the licensor.
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// For commercial licensing, see <https://www.artifex.com/> or contact
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// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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// CA 94129, USA, for further information.
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#ifndef PDF_INTERPRET_H
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#define PDF_INTERPRET_H
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#include "mupdf/pdf/font.h"
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#include "mupdf/pdf/resource.h"
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#include "mupdf/pdf/document.h"
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typedef struct pdf_gstate pdf_gstate;
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typedef struct pdf_processor pdf_processor;
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void *pdf_new_processor(fz_context *ctx, int size);
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pdf_processor *pdf_keep_processor(fz_context *ctx, pdf_processor *proc);
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void pdf_close_processor(fz_context *ctx, pdf_processor *proc);
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void pdf_drop_processor(fz_context *ctx, pdf_processor *proc);
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struct pdf_processor
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{
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int refs;
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/* close the processor. Also closes any chained processors. */
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void (*close_processor)(fz_context *ctx, pdf_processor *proc);
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void (*drop_processor)(fz_context *ctx, pdf_processor *proc);
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/* At any stage, we can have one set of resources in place.
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* This function gives us a set of resources to use. We remember
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* any previous set on a stack, so we can pop back to it later.
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* Our responsibility (as well as remembering it for our own use)
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* is to pass either it, or a filtered version of it onto any
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* chained processor. */
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void (*push_resources)(fz_context *ctx, pdf_processor *proc, pdf_obj *res);
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/* Pop the resources stack. This must be passed on to any chained
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* processors. This returns a pointer to the resource dict just
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* popped by the deepest filter. The caller inherits this reference. */
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pdf_obj *(*pop_resources)(fz_context *ctx, pdf_processor *proc);
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/* general graphics state */
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void (*op_w)(fz_context *ctx, pdf_processor *proc, float linewidth);
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void (*op_j)(fz_context *ctx, pdf_processor *proc, int linejoin);
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void (*op_J)(fz_context *ctx, pdf_processor *proc, int linecap);
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void (*op_M)(fz_context *ctx, pdf_processor *proc, float miterlimit);
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void (*op_d)(fz_context *ctx, pdf_processor *proc, pdf_obj *array, float phase);
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void (*op_ri)(fz_context *ctx, pdf_processor *proc, const char *intent);
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void (*op_i)(fz_context *ctx, pdf_processor *proc, float flatness);
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void (*op_gs_begin)(fz_context *ctx, pdf_processor *proc, const char *name, pdf_obj *extgstate);
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void (*op_gs_BM)(fz_context *ctx, pdf_processor *proc, const char *blendmode);
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void (*op_gs_ca)(fz_context *ctx, pdf_processor *proc, float alpha);
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void (*op_gs_CA)(fz_context *ctx, pdf_processor *proc, float alpha);
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void (*op_gs_SMask)(fz_context *ctx, pdf_processor *proc, pdf_obj *smask, float *bc, int luminosity);
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void (*op_gs_end)(fz_context *ctx, pdf_processor *proc);
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/* special graphics state */
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void (*op_q)(fz_context *ctx, pdf_processor *proc);
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void (*op_Q)(fz_context *ctx, pdf_processor *proc);
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void (*op_cm)(fz_context *ctx, pdf_processor *proc, float a, float b, float c, float d, float e, float f);
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/* path construction */
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void (*op_m)(fz_context *ctx, pdf_processor *proc, float x, float y);
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void (*op_l)(fz_context *ctx, pdf_processor *proc, float x, float y);
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void (*op_c)(fz_context *ctx, pdf_processor *proc, float x1, float y1, float x2, float y2, float x3, float y3);
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void (*op_v)(fz_context *ctx, pdf_processor *proc, float x2, float y2, float x3, float y3);
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void (*op_y)(fz_context *ctx, pdf_processor *proc, float x1, float y1, float x3, float y3);
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void (*op_h)(fz_context *ctx, pdf_processor *proc);
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void (*op_re)(fz_context *ctx, pdf_processor *proc, float x, float y, float w, float h);
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/* path painting */
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void (*op_S)(fz_context *ctx, pdf_processor *proc);
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void (*op_s)(fz_context *ctx, pdf_processor *proc);
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void (*op_F)(fz_context *ctx, pdf_processor *proc);
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void (*op_f)(fz_context *ctx, pdf_processor *proc);
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void (*op_fstar)(fz_context *ctx, pdf_processor *proc);
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void (*op_B)(fz_context *ctx, pdf_processor *proc);
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void (*op_Bstar)(fz_context *ctx, pdf_processor *proc);
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void (*op_b)(fz_context *ctx, pdf_processor *proc);
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void (*op_bstar)(fz_context *ctx, pdf_processor *proc);
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void (*op_n)(fz_context *ctx, pdf_processor *proc);
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/* clipping paths */
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void (*op_W)(fz_context *ctx, pdf_processor *proc);
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void (*op_Wstar)(fz_context *ctx, pdf_processor *proc);
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/* text objects */
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void (*op_BT)(fz_context *ctx, pdf_processor *proc);
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void (*op_ET)(fz_context *ctx, pdf_processor *proc);
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/* text state */
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void (*op_Tc)(fz_context *ctx, pdf_processor *proc, float charspace);
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void (*op_Tw)(fz_context *ctx, pdf_processor *proc, float wordspace);
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void (*op_Tz)(fz_context *ctx, pdf_processor *proc, float scale);
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void (*op_TL)(fz_context *ctx, pdf_processor *proc, float leading);
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void (*op_Tf)(fz_context *ctx, pdf_processor *proc, const char *name, pdf_font_desc *font, float size);
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void (*op_Tr)(fz_context *ctx, pdf_processor *proc, int render);
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void (*op_Ts)(fz_context *ctx, pdf_processor *proc, float rise);
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/* text positioning */
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void (*op_Td)(fz_context *ctx, pdf_processor *proc, float tx, float ty);
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void (*op_TD)(fz_context *ctx, pdf_processor *proc, float tx, float ty);
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void (*op_Tm)(fz_context *ctx, pdf_processor *proc, float a, float b, float c, float d, float e, float f);
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void (*op_Tstar)(fz_context *ctx, pdf_processor *proc);
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/* text showing */
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void (*op_TJ)(fz_context *ctx, pdf_processor *proc, pdf_obj *array);
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void (*op_Tj)(fz_context *ctx, pdf_processor *proc, char *str, size_t len);
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void (*op_squote)(fz_context *ctx, pdf_processor *proc, char *str, size_t len);
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void (*op_dquote)(fz_context *ctx, pdf_processor *proc, float aw, float ac, char *str, size_t len);
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/* type 3 fonts */
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void (*op_d0)(fz_context *ctx, pdf_processor *proc, float wx, float wy);
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void (*op_d1)(fz_context *ctx, pdf_processor *proc, float wx, float wy, float llx, float lly, float urx, float ury);
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/* color */
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void (*op_CS)(fz_context *ctx, pdf_processor *proc, const char *name, fz_colorspace *cs);
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void (*op_cs)(fz_context *ctx, pdf_processor *proc, const char *name, fz_colorspace *cs);
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void (*op_SC_pattern)(fz_context *ctx, pdf_processor *proc, const char *name, pdf_pattern *pat, int n, float *color);
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void (*op_sc_pattern)(fz_context *ctx, pdf_processor *proc, const char *name, pdf_pattern *pat, int n, float *color);
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void (*op_SC_shade)(fz_context *ctx, pdf_processor *proc, const char *name, fz_shade *shade);
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void (*op_sc_shade)(fz_context *ctx, pdf_processor *proc, const char *name, fz_shade *shade);
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void (*op_SC_color)(fz_context *ctx, pdf_processor *proc, int n, float *color);
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void (*op_sc_color)(fz_context *ctx, pdf_processor *proc, int n, float *color);
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void (*op_G)(fz_context *ctx, pdf_processor *proc, float g);
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void (*op_g)(fz_context *ctx, pdf_processor *proc, float g);
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void (*op_RG)(fz_context *ctx, pdf_processor *proc, float r, float g, float b);
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void (*op_rg)(fz_context *ctx, pdf_processor *proc, float r, float g, float b);
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void (*op_K)(fz_context *ctx, pdf_processor *proc, float c, float m, float y, float k);
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void (*op_k)(fz_context *ctx, pdf_processor *proc, float c, float m, float y, float k);
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/* shadings, images, xobjects */
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void (*op_BI)(fz_context *ctx, pdf_processor *proc, fz_image *image, const char *colorspace_name);
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void (*op_sh)(fz_context *ctx, pdf_processor *proc, const char *name, fz_shade *shade);
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void (*op_Do_image)(fz_context *ctx, pdf_processor *proc, const char *name, fz_image *image);
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void (*op_Do_form)(fz_context *ctx, pdf_processor *proc, const char *name, pdf_obj *form);
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/* marked content */
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void (*op_MP)(fz_context *ctx, pdf_processor *proc, const char *tag);
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void (*op_DP)(fz_context *ctx, pdf_processor *proc, const char *tag, pdf_obj *raw, pdf_obj *cooked);
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void (*op_BMC)(fz_context *ctx, pdf_processor *proc, const char *tag);
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void (*op_BDC)(fz_context *ctx, pdf_processor *proc, const char *tag, pdf_obj *raw, pdf_obj *cooked);
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void (*op_EMC)(fz_context *ctx, pdf_processor *proc);
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/* compatibility */
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void (*op_BX)(fz_context *ctx, pdf_processor *proc);
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void (*op_EX)(fz_context *ctx, pdf_processor *proc);
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/* Virtual ops for ExtGState entries */
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void (*op_gs_OP)(fz_context *ctx, pdf_processor *proc, int b);
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void (*op_gs_op)(fz_context *ctx, pdf_processor *proc, int b);
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void (*op_gs_OPM)(fz_context *ctx, pdf_processor *proc, int i);
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void (*op_gs_UseBlackPtComp)(fz_context *ctx, pdf_processor *proc, pdf_obj *name);
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/* END is used to signify end of stream (finalise and close down) */
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void (*op_END)(fz_context *ctx, pdf_processor *proc);
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/* interpreter state that persists across content streams */
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const char *usage;
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int hidden;
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};
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typedef struct
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{
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/* input */
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pdf_document *doc;
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pdf_obj *rdb;
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pdf_lexbuf *buf;
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fz_cookie *cookie;
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/* state */
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int gstate;
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int xbalance;
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int in_text;
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fz_rect d1_rect;
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/* stack */
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pdf_obj *obj;
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char name[256];
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char string[256];
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size_t string_len;
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int top;
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float stack[32];
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} pdf_csi;
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/* Functions to set up pdf_process structures */
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pdf_processor *pdf_new_run_processor(fz_context *ctx, pdf_document *doc, fz_device *dev, fz_matrix ctm, int struct_parent, const char *usage, pdf_gstate *gstate, fz_default_colorspaces *default_cs, fz_cookie *cookie);
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/*
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Create a buffer processor.
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This collects the incoming PDF operator stream into an fz_buffer.
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buffer: The (possibly empty) buffer to which operators will be
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appended.
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ahxencode: If 0, then image streams will be send as binary,
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otherwise they will be asciihexencoded.
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*/
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pdf_processor *pdf_new_buffer_processor(fz_context *ctx, fz_buffer *buffer, int ahxencode);
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/*
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Create an output processor. This
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sends the incoming PDF operator stream to an fz_output stream.
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out: The output stream to which operators will be sent.
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ahxencode: If 0, then image streams will be send as binary,
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otherwise they will be asciihexencoded.
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*/
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pdf_processor *pdf_new_output_processor(fz_context *ctx, fz_output *out, int ahxencode);
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typedef struct pdf_filter_options pdf_filter_options;
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/*
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Create a filter processor. This filters the PDF operators
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it is fed, and passes them down (with some changes) to the
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child filter.
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chain: The child processor to which the filtered operators
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will be fed.
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The options field contains a pointer to a structure with
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filter specific options in.
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*/
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typedef pdf_processor *(pdf_filter_factory_fn)(fz_context *ctx, pdf_document *doc, pdf_processor *chain, int struct_parents, fz_matrix transform, pdf_filter_options *options, void *factory_options);
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/*
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A pdf_filter_factory is a pdf_filter_factory_fn, plus the options
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needed to instantiate it.
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*/
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typedef struct
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{
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pdf_filter_factory_fn *filter;
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void *options;
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} pdf_filter_factory;
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/*
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recurse: Filter resources recursively.
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instance_forms: Always recurse on XObject Form resources, but will
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create a new instance of each XObject Form that is used, filtered
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individually.
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ascii: If true, escape all binary data in the output.
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no_update: If true, do not update the document at the end.
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opaque: Opaque value that is passed to the complete function.
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complete: A function called at the end of processing.
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This allows the caller to insert some extra content after
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all other content.
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filters: Pointer to an array of filter factory/options.
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The array is terminated by an entry with a NULL factory pointer.
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Operators will be fed into the filter generated from the first
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factory function in the list, and from there go to the filter
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generated from the second factory in the list etc.
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*/
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struct pdf_filter_options
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{
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int recurse;
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int instance_forms;
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int ascii;
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int no_update;
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void *opaque;
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void (*complete)(fz_context *ctx, fz_buffer *buffer, void *arg);
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pdf_filter_factory *filters;
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};
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typedef enum
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{
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FZ_CULL_PATH_FILL,
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FZ_CULL_PATH_STROKE,
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FZ_CULL_PATH_FILL_STROKE,
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FZ_CULL_CLIP_PATH,
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FZ_CULL_GLYPH,
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FZ_CULL_IMAGE,
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FZ_CULL_SHADING
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} fz_cull_type;
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/*
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image_filter: A function called to assess whether a given
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image should be removed or not.
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text_filter: A function called to assess whether a given
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character should be removed or not.
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after_text_object: A function called after each text object.
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This allows the caller to insert some extra content if
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desired.
|
||
|
|
|
||
|
|
culler: A function called to see whether each object should
|
||
|
|
be culled or not.
|
||
|
|
*/
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
void *opaque;
|
||
|
|
fz_image *(*image_filter)(fz_context *ctx, void *opaque, fz_matrix ctm, const char *name, fz_image *image);
|
||
|
|
int (*text_filter)(fz_context *ctx, void *opaque, int *ucsbuf, int ucslen, fz_matrix trm, fz_matrix ctm, fz_rect bbox);
|
||
|
|
void (*after_text_object)(fz_context *ctx, void *opaque, pdf_document *doc, pdf_processor *chain, fz_matrix ctm);
|
||
|
|
int (*culler)(fz_context *ctx, void *opaque, fz_rect bbox, fz_cull_type type);
|
||
|
|
}
|
||
|
|
pdf_sanitize_filter_options;
|
||
|
|
|
||
|
|
/*
|
||
|
|
A sanitize filter factory.
|
||
|
|
|
||
|
|
sopts = pointer to pdf_sanitize_filter_options.
|
||
|
|
|
||
|
|
The changes made by a filter generated from this are:
|
||
|
|
|
||
|
|
* No operations are allowed to change the top level gstate.
|
||
|
|
Additional q/Q operators are inserted to prevent this.
|
||
|
|
|
||
|
|
* Repeated/unnecessary colour operators are removed (so,
|
||
|
|
for example, "0 0 0 rg 0 1 rg 0.5 g" would be sanitised to
|
||
|
|
"0.5 g")
|
||
|
|
|
||
|
|
The intention of these changes is to provide a simpler,
|
||
|
|
but equivalent stream, repairing problems with mismatched
|
||
|
|
operators, maintaining structure (such as BMC, EMC calls)
|
||
|
|
and leaving the graphics state in an known (default) state
|
||
|
|
so that subsequent operations (such as synthesising new
|
||
|
|
operators to be appended to the stream) are easier.
|
||
|
|
|
||
|
|
The net graphical effect of the filtered operator stream
|
||
|
|
should be identical to the incoming operator stream.
|
||
|
|
*/
|
||
|
|
pdf_processor *pdf_new_sanitize_filter(fz_context *ctx, pdf_document *doc, pdf_processor *chain, int struct_parents, fz_matrix transform, pdf_filter_options *options, void *sopts);
|
||
|
|
|
||
|
|
pdf_obj *pdf_filter_xobject_instance(fz_context *ctx, pdf_obj *old_xobj, pdf_obj *page_res, fz_matrix ctm, pdf_filter_options *options, pdf_cycle_list *cycle_up);
|
||
|
|
|
||
|
|
void pdf_processor_push_resources(fz_context *ctx, pdf_processor *proc, pdf_obj *res);
|
||
|
|
|
||
|
|
pdf_obj *pdf_processor_pop_resources(fz_context *ctx, pdf_processor *proc);
|
||
|
|
|
||
|
|
/*
|
||
|
|
opaque: Opaque value that is passed to all the filter functions.
|
||
|
|
|
||
|
|
color_rewrite: function pointer called to rewrite a color
|
||
|
|
On entry:
|
||
|
|
*cs = reference to a pdf object representing the colorspace.
|
||
|
|
|
||
|
|
*n = number of color components
|
||
|
|
|
||
|
|
color = *n color values.
|
||
|
|
|
||
|
|
On exit:
|
||
|
|
*cs either the same (for no change in colorspace) or
|
||
|
|
updated to be a new one. Reference must be dropped, and
|
||
|
|
a new kept reference returned!
|
||
|
|
|
||
|
|
*n = number of color components (maybe updated)
|
||
|
|
|
||
|
|
color = *n color values (maybe updated)
|
||
|
|
|
||
|
|
image_rewrite: function pointer called to rewrite an image
|
||
|
|
On entry:
|
||
|
|
*image = reference to an fz_image.
|
||
|
|
|
||
|
|
On exit:
|
||
|
|
*image either the same (for no change) or updated
|
||
|
|
to be a new one. Reference must be dropped, and a
|
||
|
|
new kept reference returned.
|
||
|
|
*/
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
void *opaque;
|
||
|
|
void (*color_rewrite)(fz_context *ctx, void *opaque, pdf_obj **cs, int *n, float color[FZ_MAX_COLORS]);
|
||
|
|
void (*image_rewrite)(fz_context *ctx, void *opaque, fz_image **image);
|
||
|
|
pdf_shade_recolorer *shade_rewrite;
|
||
|
|
} pdf_color_filter_options;
|
||
|
|
|
||
|
|
pdf_processor *
|
||
|
|
pdf_new_color_filter(fz_context *ctx, pdf_document *doc, pdf_processor *chain, int struct_parents, fz_matrix transform, pdf_filter_options *options, void *copts);
|
||
|
|
|
||
|
|
/*
|
||
|
|
Functions to actually process annotations, glyphs and general stream objects.
|
||
|
|
*/
|
||
|
|
void pdf_process_contents(fz_context *ctx, pdf_processor *proc, pdf_document *doc, pdf_obj *obj, pdf_obj *res, fz_cookie *cookie, pdf_obj **out_res);
|
||
|
|
void pdf_process_annot(fz_context *ctx, pdf_processor *proc, pdf_annot *annot, fz_cookie *cookie);
|
||
|
|
void pdf_process_glyph(fz_context *ctx, pdf_processor *proc, pdf_document *doc, pdf_obj *resources, fz_buffer *contents);
|
||
|
|
|
||
|
|
/*
|
||
|
|
Function to process a contents stream without handling the resources.
|
||
|
|
The caller is responsible for pushing/popping the resources.
|
||
|
|
*/
|
||
|
|
void pdf_process_raw_contents(fz_context *ctx, pdf_processor *proc, pdf_document *doc, pdf_obj *rdb, pdf_obj *stmobj, fz_cookie *cookie);
|
||
|
|
|
||
|
|
/* Text handling helper functions */
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
float char_space;
|
||
|
|
float word_space;
|
||
|
|
float scale;
|
||
|
|
float leading;
|
||
|
|
pdf_font_desc *font;
|
||
|
|
float size;
|
||
|
|
int render;
|
||
|
|
float rise;
|
||
|
|
} pdf_text_state;
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
fz_text *text;
|
||
|
|
fz_rect text_bbox;
|
||
|
|
fz_matrix tlm;
|
||
|
|
fz_matrix tm;
|
||
|
|
int text_mode;
|
||
|
|
|
||
|
|
int cid;
|
||
|
|
int gid;
|
||
|
|
fz_rect char_bbox;
|
||
|
|
pdf_font_desc *fontdesc;
|
||
|
|
float char_tx;
|
||
|
|
float char_ty;
|
||
|
|
} pdf_text_object_state;
|
||
|
|
|
||
|
|
void pdf_tos_save(fz_context *ctx, pdf_text_object_state *tos, fz_matrix save[2]);
|
||
|
|
void pdf_tos_restore(fz_context *ctx, pdf_text_object_state *tos, fz_matrix save[2]);
|
||
|
|
fz_text *pdf_tos_get_text(fz_context *ctx, pdf_text_object_state *tos);
|
||
|
|
void pdf_tos_reset(fz_context *ctx, pdf_text_object_state *tos, int render);
|
||
|
|
int pdf_tos_make_trm(fz_context *ctx, pdf_text_object_state *tos, pdf_text_state *text, pdf_font_desc *fontdesc, int cid, fz_matrix *trm);
|
||
|
|
void pdf_tos_move_after_char(fz_context *ctx, pdf_text_object_state *tos);
|
||
|
|
void pdf_tos_translate(pdf_text_object_state *tos, float tx, float ty);
|
||
|
|
void pdf_tos_set_matrix(pdf_text_object_state *tos, float a, float b, float c, float d, float e, float f);
|
||
|
|
void pdf_tos_newline(pdf_text_object_state *tos, float leading);
|
||
|
|
|
||
|
|
#endif
|