pax_global_header00006660000000000000000000000064140055732360014517gustar00rootroot0000000000000052 comment=e345937378853cff1bed27a5be834e8195a72099 pdfresurrect-0.22/000077500000000000000000000000001400557323600141525ustar00rootroot00000000000000pdfresurrect-0.22/.gitignore000066400000000000000000000000631400557323600161410ustar00rootroot00000000000000config.log config.status Makefile pdfresurrect *.o pdfresurrect-0.22/AUTHORS000066400000000000000000000017751400557323600152340ustar00rootroot00000000000000Matt Davis (enferex): Original pdfresurrect, modified man page Francois Marier: Original man page, modified Makefile.in and modified configure.ac, potential security bug identifying (e.g., bad code detection). David Binderman: Finding a bug and offering a correction suggestion Ryan Schmidt: MacPorts Makefile work xambroz: Suggestions and Makefile enhancement. j0lamma: Identified a bug that can cause a corrupted buffer. capcorpscert0188, LeeSunWoo, ParkInChul: Identified a bug that can cause a corrupted buffer. rtfingc: Reported bugs regarding memory corruption and a leak. rwhitworth: Reported and helped isolate bugs. Created initial .gitignore. carter-yagemann: Reported and helped isolate a memory issue. rootup: Reporting and helped isolate a memory issue. ZanderChang: Reported and identified bad code in kid page loading. yifengchen-cc: Reported a header parsing bug. kinzhong: Reported and isolated a xref scanning bug. pdfresurrect-0.22/ChangeLog000066400000000000000000000147571400557323600157420ustar00rootroot00000000000000-- Version 0.22 -- * pdf.c: Guard the xref plaintext scan. -- Version 0.21 -- * pdfresurrect.1, pdf.c, main.c: Make scrub mode (-s) experimental. * pdf.c: Update PDF header sanity check. -- Version 0.20 -- * pdf.c: Make buf_idx a size_t. Guard strtok access (thanks rootup). Add a null check to the page load routine. Add a .gitignore (thanks rwhitworth). Clean up a strlen calc (thanks Francois Marier). Increase the creator buffer to 64B and guard against overflow (thanks carter-yagemann) -- Version 0.19 -- * pdf.c: Add bounds guards for reading creator data. -- Version 0.18 -- 2019-08-10 Matt Davis * pdf.c: Add a safe memory allocation routine (zeros and sanity checks). Free a memory leak. Thanks to rtfingc for reporting the related bugs this patch addresses. -- Version 0.17 -- 2019-08-06 Matt Davis * pdf.c: Fix a buffer corruption bug identified by: capcorpscert0188, LeeSunWoo, ParkInChul -- Version 0.16 -- 2019-07-25 Matt Davis * pdf.c: Fix a buffer corruption bug identified by j0lamma. * main.c: Fix grammar in an error message. -- Version 0.15 -- 2018-05-08 Matt Davis * pdf.c: Sanity check various file operations (fread, fseek). * configure.ac: Remove GNU defaults. * User can override CFLAGS during configure. 2018-05-07 Michal Ambroz * Makefile.in: Create the binary destination directory if it does not exist. -- Version 0.14 -- 2017-11-24 Matt Davis * main.c: Simplify the writing of older version. * Only emit a startxref block with an older xref * position, and nothing more. -- Version 0.13 -- 2017-11-24 Matt Davis * pdf.c: Bug fix - guard xref access during scrubbing. 2013-11-17 Matt Davis * Makefile.in: Add the man1 directory if it does not exit. 2013-11-7 Ryan Schmidt * Makefile.in: Honor configure argument: * --exec-prefix, --bindir, --datarootdir, --mandir 2013-10-25: David Binderman. * pdf.c: Added a logical fix submitted by David B. -- Version 0.12 -- 2012-11-30 Matt Davis * pdfresurrect.1: Less emphasis on scrubbing. * Cleaned up some wording. 2012-11-29 Matt Davis * pdf.c: Use a better EOF finding algorithm. * This should ensure that all EOFs are found, previously if an EOF was * on a 256 character boundary, it would not be detected. 2012-11-25 Matt Davis * configure.ac: Disable all optimizations when compiling a debugging version * pdf.c: Clean up a comment -- Version 0.11 -- 2012-05-28 Francois Marier * Makefile.in: Add LDFLAGS macro * * Update install and uninstall targets using DESTDIR macro * * Update CFLAGS macro to include CPPFLAGS * configure.ac: Preserve existing CFLAGS 2012-05-28 Matt Davis * pdf.c: Prevent invalid access and double frees when the xref table is * of a zero length (thanks valgrind, oh so sexxy). * * ChangeLog: Correct a line not prefixed with an asterisk. 2012-04-29 Matt Davis * pdf.c: Initialize a variable * * Add a macro for safe file access 2010-03-21 Matt Davis * pdf.c: Clean up memory leak just introduced by the new creator-from-object * piece * * Removed strdup and used strndup for portability * * Allow creation tags to be picked up even if they are stored in objects * and not inline. * * Initialize a pointer -- Version 0.10 -- 2010-03-20 Matt Davis * main.c: Add additional copyright year * pdf.c: Allow for creation data to be pulled from objects as well as inline * Removed strdup and used strncpy for portability purposes * Makefile.in: Allow for EXTRA_CFLAGS to be specified from command line * pdfresurrect.1: Updated AUTHORS section to give Francois more props * Adjust date -- Version 0.9 -- 2009-11-11 Matt Davis * pdf.c: Display the entire line for creator information * Avoid terminating the creator information past the array index -- Version 0.8 -- 2009-09-10 Matt Davis * pdf.c, main.c: Avoid stalling if we cannot find a trailer for linearized * PDFs. This is probably because the PDF is using xref * streams. Thanks to Francois for mentioning a stall was * occurring, and then providing the suspect document that caused * such a case. -- Version 0.7 -- 2009-09-09 Matt Davis * configure.ac: Added function check for strdup and strtol * pdf.{c,h}: Support to extract PDF creator information (not XML format) * pdf.c: Count objects from linearized PDFs appropriately 2009-05-24 Francois Marier * pdfresurrect.1: Added Francois Marier's update to the man page * escaping a hyphen -- Version 0.6 -- 2009-05-23 Matt Davis and * pdfresurrect.1: Added Francois Marier's man page. * Added NOTES and COPYRIGHT to man page. * Makefile.in: Added .PHONY target for uninstall * Removed backup target * install and uninstall targets also add/remove the man page * configure.ac: Added default prefix as suggested by Francois Marier 2009-05-22 Francois Marier * pdfresurrect.1: Added Francois Marier's man page. * Makefile.in: Added Francois Marier's changes to add * install, distclean, and .PHONY targets -- Version 0.5 -- 2009-05-19 Matt Davis * pdf.h: Added notes that PDFs of version 1.5+ can have compressed stream xref * pdf.c: Warn on encoded xref streams * * Added utility get_object_from_here() to obtain a PDF object at file * pointer start * * Break the xref into a routine for plaintext or encoded * We will probably not decode the compressed stream but its * nice to have a place for it. * configure.in: Added -DDEBUG on debug builds (nothing uses this yet) * * Added AC_TYPE_SIZE_T check * main.c: Added -s to the usage statement * * Using more portable exit call * README: Updated with some notes on security and validity of this tool -- Version 0.04 -- 2008-08-10 Matt Davis * Corrected a misspelling regarding the license URL in main.c -- Version 0.03 -- 2008-08-02 Matt Davis * Initial public release pdfresurrect-0.22/LICENSE000066400000000000000000001045131400557323600151630ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. 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Copyright (C) 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 3 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, see . Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: Copyright (C) This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . pdfresurrect-0.22/Makefile.in000066400000000000000000000013321400557323600162160ustar00rootroot00000000000000APP = pdfresurrect MANPAGE = pdfresurrect.1 OBJS = main.o pdf.o CC = @CC@ CFLAGS = @AM_CFLAGS@ $(EXTRA_CFLAGS) LDFLAGS = @LDFLAGS@ prefix = @prefix@ exec_prefix = @exec_prefix@ bindir = @bindir@ mandir = @mandir@ datarootdir = @datarootdir@ all: $(OBJS) $(APP) $(APP): $(OBJS) $(CC) -o $@ $(OBJS) $(CFLAGS) $(LDFLAGS) %.o: %.c $(CC) -o $@ -c $< $(CFLAGS) install: mkdir -p $(DESTDIR)$(bindir) cp $(APP) $(DESTDIR)$(bindir) mkdir -p $(DESTDIR)$(mandir)/man1 cp $(MANPAGE) $(DESTDIR)$(mandir)/man1 uninstall: rm $(DESTDIR)$(bindir)/$(APP) rm $(DESTDIR)$(mandir)/man1/$(MANPAGE) clean: rm -rfv $(OBJS) $(APP) distclean: clean rm -f Makefile rm -f config.log config.status .PHONY: install uninstall clean distclean pdfresurrect-0.22/README000066400000000000000000000051021400557323600150300ustar00rootroot00000000000000pdfresurrect ------------ PDFResurrect is a tool aimed at analyzing PDF documents. The PDF format allows for previous document changes to be retained in a more recent version of the document, thereby creating a running history of changes for the document. This tool attempts to modify the PDF so that a reading utility will be presented with the previous versions of the PDF. The modififed "versions" will be generated as new files leaving the original PDF unmodified. Notes ----- The scrubbing feature (-s) should not be trusted for any serious security uses. After using this experimental feature, please verify that it in fact zero'd all of the objects that were of concern (those objects that were to be zero'd). Currently this feature will likely not render a working pdf. This tool relies on the application reading the pdfresurrect extracted versions to treat the last xref table as the most recent in the document. This should typically be the case. The verbose output, which tries to deduce the PDF object type (e.g. stream, page), is not always accurate, and the object counts might not be 100% accurate. However, this should not prevent the extraction of the versions. This output is merely to provide a hint for the user as to what might be different between the documents. Object counts might appear off in linearized PDF documents. That is not truly the case, the reason for this is that each version of the PDF consists of the objects that compose the linear portion of the PDF plus all of the objects that compose the version in question. Suppose there is a linearized PDF with 59 objects in its linear portion, and suppose the PDF has a second version that consists of 21 objects. The total number of objects in "version 2" would be 59 + 21 or 80 objects. Building -------- From the top-level directory of pdfresurrect run: ./configure make To install/uninstall the resulting binary to a specific path the '--prefix=' flag can be used: ./configure --prefix=/my/desired/path/ Debugging mode can be enabled when configuring by using the following option: ./configure --enable-debug The resulting binary can be placed anywhere, however it can also be installed/uninstalled to the configured path automatically. If no path was specified at configure time, the default is /usr/local/bin To install/uninstall: make install or make uninstall Thanks ------ The rest of the 757/757Labs crew. GNU (www.gnu.org). All of the contributors: See AUTHORS file. Contact / Project URL --------------------- mattdavis9@gmail.com https://github.com/enferex/pdfresurrect pdfresurrect-0.22/configure000077500000000000000000004325501400557323600160720ustar00rootroot00000000000000#! /bin/sh # Guess values for system-dependent variables and create Makefiles. # Generated by GNU Autoconf 2.69. # # # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc. # # # This configure script is free software; the Free Software Foundation # gives unlimited permission to copy, distribute and modify it. ## -------------------- ## ## M4sh Initialization. ## ## -------------------- ## # Be more Bourne compatible DUALCASE=1; export DUALCASE # for MKS sh if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then : emulate sh NULLCMD=: # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which # is contrary to our usage. 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AC_PREREQ(2.61) AC_INIT # Install prefix AC_PREFIX_DEFAULT(/usr/local) # Checks for programs, and clears CFLAGS during the check. X="$CFLAGS" CFLAGS="" AC_PROG_CC CFLAGS="$X" # Checks for header files. AC_HEADER_DIRENT AC_HEADER_STDC AC_CHECK_HEADERS([stdlib.h string.h]) # Checks for typedefs, structures, and compiler characteristics. AC_C_CONST AC_TYPE_SIZE_T # Check for functions AC_CHECK_FUNCS([strdup strtol]) # Initialize CFLAGS. If it is empty set optimization, # otherwise the user has a CFLAGS set, so use that. if test "xyz$CFLAGS" = "xyz"; then AM_CFLAGS="-O3 -Wall" else AM_CFLAGS="$CFLAGS" fi # Macros AC_ARG_ENABLE([debug], [AC_HELP_STRING([--enable-debug], [Enable debugging output])], [AM_CFLAGS=" -O0 -g3 -DDEBUG -Wall"], [AM_CFLAGS+=""]) AC_SUBST([AM_CFLAGS]) AC_FUNC_CLOSEDIR_VOID AC_FUNC_MALLOC AC_FUNC_MEMCMP AC_FUNC_REALLOC AC_CHECK_FUNCS([memset mkdir strchr strrchr strstr]) AC_CONFIG_FILES([Makefile]) AC_OUTPUT pdfresurrect-0.22/main.c000066400000000000000000000223161400557323600152460ustar00rootroot00000000000000/****************************************************************************** * main.c * * pdfresurrect - PDF history extraction tool * * Copyright (C) 2008-2010, 2012, 2017, 2019-21 Matt Davis (enferex). * * Special thanks to all of the contributors: See AUTHORS. * * Special thanks to 757labs (757 crew), they are a great group * of people to hack on projects and brainstorm with. * * main.c is part of pdfresurrect. * pdfresurrect 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 3 of the License, or * (at your option) any later version. * * pdfresurrect 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 pdfresurrect. If not, see . *****************************************************************************/ #include #include #include #include #include #include #include "main.h" #include "pdf.h" static void usage(void) { printf(EXEC_NAME " Copyright (C) 2008-2010, 2012, 2013, 2017, 2019-21 " "Matt Davis (enferex)\n" "Special thanks to all contributors and the 757 crew.\n" "See the AUTHORS file for a list of other contributors.\n" "This program comes with ABSOLUTELY NO WARRANTY\n" "This is free software, and you are welcome to redistribute it\n" "under certain conditions. For details see the file 'LICENSE'\n" "that came with this software or visit:\n" "\n\n"); printf("-- " EXEC_NAME " v" VER" --\n" "Usage: ./" EXEC_NAME " [-i] [-w] [-q]\n" "\t -i Display PDF creator information\n" "\t -w Write the PDF versions and summary to disk\n" "\t -q Display only the number of versions contained in the PDF\n"); // Experimental feature: // "\t -s Scrub the previous history data from the specified PDF\n"); exit(0); } static void write_version( FILE *fp, const char *fname, const char *dirname, xref_t *xref) { long start; char *c, *new_fname, data; FILE *new_fp; start = ftell(fp); /* Create file */ if ((c = strstr(fname, ".pdf"))) *c = '\0'; new_fname = safe_calloc(strlen(fname) + strlen(dirname) + 32); snprintf(new_fname, strlen(fname) + strlen(dirname) + 32, "%s/%s-version-%d.pdf", dirname, fname, xref->version); if (!(new_fp = fopen(new_fname, "w"))) { ERR("Could not create file '%s'\n", new_fname); fseek(fp, start, SEEK_SET); free(new_fname); return; } /* Copy original PDF */ fseek(fp, 0, SEEK_SET); while (fread(&data, 1, 1, fp)) fwrite(&data, 1, 1, new_fp); /* Emit an older startxref, refering to an older version. */ fprintf(new_fp, "\r\nstartxref\r\n%ld\r\n%%%%EOF", xref->start); /* Clean */ fclose(new_fp); free(new_fname); fseek(fp, start, SEEK_SET); } #ifdef PDFRESURRECT_EXPERIMENTAL static void scrub_document(FILE *fp, const pdf_t *pdf) { FILE *new_fp; int ch, i, j, last_version ; char *new_name, *c; const char *suffix = "-scrubbed.pdf"; printf("The scrub feature (-s) is experimental and likely not to work as " "expected.\n"); /* Create a new name */ if (!(new_name = malloc(strlen(pdf->name) + strlen(suffix) + 1))) { ERR("Insufficient memory to create scrubbed file name\n"); return; } strcpy(new_name, pdf->name); if ((c = strrchr(new_name, '.'))) *c = '\0'; strcat(new_name, suffix); if ((new_fp = fopen(new_name, "r"))) { ERR("File name already exists for saving scrubbed document\n"); free(new_name); fclose(new_fp); return; } if (!(new_fp = fopen(new_name, "w+"))) { ERR("Could not create file for saving scrubbed document\n"); free(new_name); fclose(new_fp); return; } /* Copy */ fseek(fp, SEEK_SET, 0); while ((ch = fgetc(fp)) != EOF) fputc(ch, new_fp); /* Find last version (dont zero these baddies) */ last_version = 0; for (i=0; in_xrefs; i++) if (pdf->xrefs[i].version) last_version = pdf->xrefs[i].version; /* Zero mod objects from all but the most recent version * Zero del objects from all versions */ fseek(new_fp, 0, SEEK_SET); for (i=0; in_xrefs; i++) { for (j=0; jxrefs[i].n_entries; j++) if (!pdf->xrefs[i].entries[j].obj_id) continue; else { switch (pdf_get_object_status(pdf, i, j)) { case 'M': if (pdf->xrefs[i].version != last_version) pdf_zero_object(new_fp, pdf, i, j); break; case 'D': pdf_zero_object(new_fp, pdf, i, j); break; default: break; } } } /* Clean */ free(new_name); fclose(new_fp); } #endif // PDFRESURRECT_EXPERIMENTAL static void display_creator(FILE *fp, const pdf_t *pdf) { int i; printf("PDF Version: %d.%d\n", pdf->pdf_major_version, pdf->pdf_minor_version); for (i=0; in_xrefs; ++i) { if (!pdf->xrefs[i].version) continue; if (pdf_display_creator(pdf, i)) printf("\n"); } } static pdf_t *init_pdf(FILE *fp, const char *name) { pdf_t *pdf; pdf = pdf_new(name); pdf_get_version(fp, pdf); if (pdf_load_xrefs(fp, pdf) == -1) { pdf_delete(pdf); return NULL; } return pdf; } void *safe_calloc(size_t size) { void *addr; if (!size) { ERR("Invalid allocation size.\n"); exit(EXIT_FAILURE); } if (!(addr = calloc(1, size))) { ERR("Failed to allocate requested number of bytes, out of memory?\n"); exit(EXIT_FAILURE); } return addr; } int main(int argc, char **argv) { int i, n_valid, do_write, do_scrub; char *c, *dname, *name; DIR *dir; FILE *fp; pdf_t *pdf; pdf_flag_t flags; if (argc < 2) usage(); /* Args */ do_write = do_scrub = flags = 0; name = NULL; for (i=1; in_xrefs; i++) if (pdf->xrefs[i].version) ++n_valid; /* Bail if we only have 1 valid */ if (n_valid < 2) { if (!(flags & (PDF_FLAG_QUIET | PDF_FLAG_DISP_CREATOR))) printf("%s: There is only one version of this PDF\n", pdf->name); if (do_write) { fclose(fp); pdf_delete(pdf); return 0; } } dname = NULL; if (do_write) { /* Create directory to place the various versions in */ if ((c = strrchr(name, '/'))) name = c + 1; if ((c = strrchr(name, '.'))) *c = '\0'; dname = safe_calloc(strlen(name) + 16); sprintf(dname, "%s-versions", name); if (!(dir = opendir(dname))) mkdir(dname, S_IRWXU); else { ERR("This directory already exists, PDF version extraction will " "not occur.\n"); fclose(fp); closedir(dir); free(dname); pdf_delete(pdf); return -1; } /* Write the pdf as a pervious version */ for (i=0; in_xrefs; i++) if (pdf->xrefs[i].version) write_version(fp, name, dname, &pdf->xrefs[i]); } /* Generate a per-object summary */ pdf_summarize(fp, pdf, dname, flags); #ifdef PDFRESURRECT_EXPERIMENTAL /* Have we been summoned to scrub history from this PDF */ if (do_scrub) scrub_document(fp, pdf); #endif /* Display extra information */ if (flags & PDF_FLAG_DISP_CREATOR) display_creator(fp, pdf); fclose(fp); free(dname); pdf_delete(pdf); return 0; } pdfresurrect-0.22/main.h000066400000000000000000000030731400557323600152520ustar00rootroot00000000000000/****************************************************************************** * main.h * * pdfresurrect - PDF history extraction tool * * Copyright (C) 2008, 2009, 2010, 2012, 2019, 2020, 2021 Matt Davis (enferex). * * Special thanks to all of the contributors: See AUTHORS. * * Special thanks to 757labs (757 crew), they are a great group * of people to hack on projects and brainstorm with. * * main.h is part of pdfresurrect. * pdfresurrect 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 3 of the License, or * (at your option) any later version. * * pdfresurrect 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 pdfresurrect. If not, see . *****************************************************************************/ #ifndef MAIN_H_INCLUDE #define MAIN_H_INCLUDE #include #define EXEC_NAME "pdfresurrect" #define VER_MAJOR "0" #define VER_MINOR "22" #define VER VER_MAJOR"."VER_MINOR #define TAG "[pdfresurrect]" #define ERR(...) {fprintf(stderr, TAG" -- Error -- " __VA_ARGS__);} /* Returns a zero'd buffer of 'size' bytes or exits in failure. */ extern void *safe_calloc(size_t bytes); #endif /* MAIN_H_INCLUDE */ pdfresurrect-0.22/pdf.c000066400000000000000000001020451400557323600150710ustar00rootroot00000000000000/****************************************************************************** * pdf.c * * pdfresurrect - PDF history extraction tool * * Copyright (C) 2008-2010, 2012-2013, 2017-20, Matt Davis (enferex). * * Special thanks to all of the contributors: See AUTHORS. * * Special thanks to 757labs (757 crew), they are a great group * of people to hack on projects and brainstorm with. * * pdf.c is part of pdfresurrect. * pdfresurrect 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 3 of the License, or * (at your option) any later version. * * pdfresurrect 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 pdfresurrect. If not, see . *****************************************************************************/ #include #include #include #include "pdf.h" #include "main.h" /* * Macros */ /* SAFE_F * * Safe file read: use for fgetc() calls, this is really ugly looking. * _fp: FILE * handle * _expr: The expression with fgetc() in it: * * example: If we get a character from the file and it is ascii character 'a' * This assumes the coder wants to store the 'a' in variable ch * Kinda pointless if you already know that you have 'a', but for * illustrative purposes. * * if (SAFE_F(my_fp, ((c=fgetc(my_fp)) == 'a'))) * do_way_cool_stuff(); */ #define SAFE_F(_fp, _expr) \ ((!ferror(_fp) && !feof(_fp) && (_expr))) /* FAIL * * Emit the diagnostic '_msg' and exit. * _msg: Message to emit prior to exiting. */ #define FAIL(_msg) \ do { \ ERR(_msg); \ exit(EXIT_FAILURE); \ } while (0) /* SAFE_E * * Safe expression handling. This macro is a wrapper * that compares the result of an expression (_expr) to the expected * value (_cmp). * * _expr: Expression to test. * _cmp: Expected value, error if this returns false. * _msg: What to say when an error occurs. */ #define SAFE_E(_expr, _cmp, _msg) \ do { \ if ((_expr) != (_cmp)) { \ FAIL(_msg); \ } \ } while (0) /* * Forwards */ static int is_valid_xref(FILE *fp, pdf_t *pdf, xref_t *xref); static void load_xref_entries(FILE *fp, xref_t *xref); static void load_xref_from_plaintext(FILE *fp, xref_t *xref); static void load_xref_from_stream(FILE *fp, xref_t *xref); static void get_xref_linear_skipped(FILE *fp, xref_t *xref); static void resolve_linearized_pdf(pdf_t *pdf); static pdf_creator_t *new_creator(int *n_elements); static void load_creator(FILE *fp, pdf_t *pdf); static void load_creator_from_buf( FILE *fp, xref_t *xref, const char *buf, size_t buf_size); static void load_creator_from_xml(xref_t *xref, const char *buf); static void load_creator_from_old_format( FILE *fp, xref_t *xref, const char *buf, size_t buf_size); static char *get_object_from_here(FILE *fp, size_t *size, int *is_stream); static char *get_object( FILE *fp, int obj_id, const xref_t *xref, size_t *size, int *is_stream); static const char *get_type(FILE *fp, int obj_id, const xref_t *xref); /* static int get_page(int obj_id, const xref_t *xref); */ static char *get_header(FILE *fp); static char *decode_text_string(const char *str, size_t str_len); static int get_next_eof(FILE *fp); /* * Defined */ pdf_t *pdf_new(const char *name) { const char *n; pdf_t *pdf; pdf = safe_calloc(sizeof(pdf_t)); if (name) { /* Just get the file name (not path) */ if ((n = strrchr(name, '/'))) ++n; else n = name; pdf->name = safe_calloc(strlen(n) + 1); strcpy(pdf->name, n); } else /* !name */ { pdf->name = safe_calloc(strlen("Unknown") + 1); strcpy(pdf->name, "Unknown"); } return pdf; } void pdf_delete(pdf_t *pdf) { int i; for (i=0; in_xrefs; i++) { free(pdf->xrefs[i].creator); free(pdf->xrefs[i].entries); } free(pdf->name); free(pdf->xrefs); free(pdf); } int pdf_is_pdf(FILE *fp) { char *header; if (!(header = get_header(fp))) return 0; /* First 1024 bytes of doc must be header (1.7 spec pg 1102) */ const char *c = strstr(header, "%PDF-"); const int is_pdf = c && ((c - header+strlen("%PDF-M.m")) < 1024); free(header); return is_pdf; } void pdf_get_version(FILE *fp, pdf_t *pdf) { char *header = get_header(fp); /* Locate version string start and make sure we dont go past header * The format is %PDF-M.m, where 'M' is the major number and 'm' minor. */ const char *c; if ((c = strstr(header, "%PDF-")) && ((c + 6)[0] == '.') && // Separator isdigit((c + 5)[0]) && // Major number isdigit((c + 7)[0])) // Minor number { pdf->pdf_major_version = atoi(c + strlen("%PDF-")); pdf->pdf_minor_version = atoi(c + strlen("%PDF-M.")); } free(header); } int pdf_load_xrefs(FILE *fp, pdf_t *pdf) { int i, ver, is_linear; long pos, pos_count; char x, *c, buf[256]; c = NULL; /* Count number of xrefs */ pdf->n_xrefs = 0; fseek(fp, 0, SEEK_SET); while (get_next_eof(fp) >= 0) ++pdf->n_xrefs; if (!pdf->n_xrefs) return 0; /* Load in the start/end positions */ fseek(fp, 0, SEEK_SET); pdf->xrefs = safe_calloc(sizeof(xref_t) * pdf->n_xrefs); ver = 1; for (i=0; in_xrefs; i++) { /* Seek to %%EOF */ if ((pos = get_next_eof(fp)) < 0) break; /* Set and increment the version */ pdf->xrefs[i].version = ver++; /* Rewind until we find end of "startxref" */ pos_count = 0; while (SAFE_F(fp, ((x = fgetc(fp)) != 'f'))) fseek(fp, pos - (++pos_count), SEEK_SET); /* Suck in end of "startxref" to start of %%EOF */ if (pos_count >= sizeof(buf)) { FAIL("Failed to locate the startxref token. " "This might be a corrupt PDF.\n"); } memset(buf, 0, sizeof(buf)); SAFE_E(fread(buf, 1, pos_count, fp), pos_count, "Failed to read startxref.\n"); c = buf; while (*c == ' ' || *c == '\n' || *c == '\r') ++c; /* xref start position */ pdf->xrefs[i].start = atol(c); /* If xref is 0 handle linear xref table */ if (pdf->xrefs[i].start == 0) get_xref_linear_skipped(fp, &pdf->xrefs[i]); /* Non-linear, normal operation, so just find the end of the xref */ else { /* xref end position */ pos = ftell(fp); fseek(fp, pdf->xrefs[i].start, SEEK_SET); pdf->xrefs[i].end = get_next_eof(fp); /* Look for next EOF and xref data */ fseek(fp, pos, SEEK_SET); } /* Check validity */ if (!is_valid_xref(fp, pdf, &pdf->xrefs[i])) { is_linear = pdf->xrefs[i].is_linear; memset(&pdf->xrefs[i], 0, sizeof(xref_t)); pdf->xrefs[i].is_linear = is_linear; rewind(fp); get_next_eof(fp); continue; } /* Load the entries from the xref */ load_xref_entries(fp, &pdf->xrefs[i]); } /* Now we have all xref tables, if this is linearized, we need * to make adjustments so that things spit out properly */ if (pdf->xrefs[0].is_linear) resolve_linearized_pdf(pdf); /* Ok now we have all xref data. Go through those versions of the * PDF and try to obtain creator information */ load_creator(fp, pdf); return pdf->n_xrefs; } /* Load page information */ char pdf_get_object_status( const pdf_t *pdf, int xref_idx, int entry_idx) { int i, curr_ver; const xref_t *prev_xref; const xref_entry_t *prev, *curr; curr = &pdf->xrefs[xref_idx].entries[entry_idx]; curr_ver = pdf->xrefs[xref_idx].version; if (curr_ver == 1) return 'A'; /* Deleted (freed) */ if (curr->f_or_n == 'f') return 'D'; /* Get previous version */ prev_xref = NULL; for (i=xref_idx; i>-1; --i) if (pdf->xrefs[i].version < curr_ver) { prev_xref = &pdf->xrefs[i]; break; } if (!prev_xref) return '?'; /* Locate the object in the previous one that matches current one */ prev = NULL; for (i=0; in_entries; ++i) if (prev_xref->entries[i].obj_id == curr->obj_id) { prev = &prev_xref->entries[i]; break; } /* Added in place of a previously freed id */ if (!prev || ((prev->f_or_n == 'f') && (curr->f_or_n == 'n'))) return 'A'; /* Modified */ else if (prev->offset != curr->offset) return 'M'; return '?'; } void pdf_zero_object( FILE *fp, const pdf_t *pdf, int xref_idx, int entry_idx) { int i; char *obj; size_t obj_sz; xref_entry_t *entry; entry = &pdf->xrefs[xref_idx].entries[entry_idx]; fseek(fp, entry->offset, SEEK_SET); /* Get object and size */ obj = get_object(fp, entry->obj_id, &pdf->xrefs[xref_idx], NULL, NULL); i = obj_sz = 0; while (strncmp((++i)+obj, "endobj", 6)) ++obj_sz; if (obj_sz) obj_sz += strlen("endobj") + 1; /* Zero object */ for (i=0; iobj_id); free(obj); } /* Output information per version */ void pdf_summarize( FILE *fp, const pdf_t *pdf, const char *name, pdf_flag_t flags) { int i, j, page, n_versions, n_entries; FILE *dst, *out; char *dst_name, *c; dst = NULL; dst_name = NULL; if (name) { dst_name = safe_calloc(strlen(name) * 2 + 16); sprintf(dst_name, "%s/%s", name, name); if ((c = strrchr(dst_name, '.')) && (strncmp(c, ".pdf", 4) == 0)) *c = '\0'; strcat(dst_name, ".summary"); if (!(dst = fopen(dst_name, "w"))) { ERR("Could not open file '%s' for writing\n", dst_name); return; } } /* Send output to file or stdout */ out = (dst) ? dst : stdout; /* Count versions */ n_versions = pdf->n_xrefs; if (n_versions && pdf->xrefs[0].is_linear) --n_versions; /* Ignore bad xref entry */ for (i=1; in_xrefs; ++i) if (pdf->xrefs[i].end == 0) --n_versions; /* If we have no valid versions but linear, count that */ if (!pdf->n_xrefs || (!n_versions && pdf->xrefs[0].is_linear)) n_versions = 1; /* Compare each object (if we dont have xref streams) */ n_entries = 0; for (i=0; !(const int)pdf->has_xref_streams && in_xrefs; i++) { if (flags & PDF_FLAG_QUIET) continue; for (j=0; jxrefs[i].n_entries; j++) { ++n_entries; fprintf(out, "%s: --%c-- Version %d -- Object %d (%s)", pdf->name, pdf_get_object_status(pdf, i, j), pdf->xrefs[i].version, pdf->xrefs[i].entries[j].obj_id, get_type(fp, pdf->xrefs[i].entries[j].obj_id, &pdf->xrefs[i])); /* TODO page = get_page(pdf->xrefs[i].entries[j].obj_id, &pdf->xrefs[i]); */ if (0 /*page*/) fprintf(out, " Page(%d)\n", page); else fprintf(out, "\n"); } } /* Trailing summary */ if (!(flags & PDF_FLAG_QUIET)) { /* Let the user know that we cannot we print a per-object summary. * If we have a 1.5 PDF using streams for xref, we have not objects * to display, so let the user know whats up. */ if (pdf->has_xref_streams || !n_entries) fprintf(out, "%s: This PDF contains potential cross reference streams.\n" "%s: An object summary is not available.\n", pdf->name, pdf->name); fprintf(out, "---------- %s ----------\n" "Versions: %d\n", pdf->name, n_versions); /* Count entries for summary */ if (!pdf->has_xref_streams) for (i=0; in_xrefs; i++) { if (pdf->xrefs[i].is_linear) continue; n_entries = pdf->xrefs[i].n_entries; /* If we are a linearized PDF, all versions are made from those * objects too. So count em' */ if (pdf->xrefs[0].is_linear) n_entries += pdf->xrefs[0].n_entries; if (pdf->xrefs[i].version && n_entries) fprintf(out, "Version %d -- %d objects\n", pdf->xrefs[i].version, n_entries); } } else /* Quiet output */ fprintf(out, "%s: %d\n", pdf->name, n_versions); if (dst) { fclose(dst); free(dst_name); } } /* Returns '1' if we successfully display data (means its probably not xml) */ int pdf_display_creator(const pdf_t *pdf, int xref_idx) { int i; if (!pdf->xrefs[xref_idx].creator) return 0; for (i=0; ixrefs[xref_idx].n_creator_entries; ++i) printf("%s: %s\n", pdf->xrefs[xref_idx].creator[i].key, pdf->xrefs[xref_idx].creator[i].value); return (i > 0); } /* Checks if the xref is valid and sets 'is_stream' flag if the xref is a * stream (PDF 1.5 or higher) */ static int is_valid_xref(FILE *fp, pdf_t *pdf, xref_t *xref) { int is_valid; long start; char *c, buf[16]; memset(buf, 0, sizeof(buf)); is_valid = 0; start = ftell(fp); fseek(fp, xref->start, SEEK_SET); if (fgets(buf, 16, fp) == NULL) { ERR("Failed to load xref string."); exit(EXIT_FAILURE); } if (strncmp(buf, "xref", strlen("xref")) == 0) is_valid = 1; else { /* PDFv1.5+ allows for xref data to be stored in streams vs plaintext */ fseek(fp, xref->start, SEEK_SET); c = get_object_from_here(fp, NULL, &xref->is_stream); if (c && xref->is_stream) { pdf->has_xref_streams = 1; is_valid = 1; } free(c); } fseek(fp, start, SEEK_SET); return is_valid; } static void load_xref_entries(FILE *fp, xref_t *xref) { if (xref->is_stream) load_xref_from_stream(fp, xref); else load_xref_from_plaintext(fp, xref); } static void load_xref_from_plaintext(FILE *fp, xref_t *xref) { int i, obj_id, added_entries; char c, buf[32] = {0}; long start, pos; size_t buf_idx; start = ftell(fp); /* Get number of entries */ pos = xref->end; fseek(fp, pos, SEEK_SET); while (ftell(fp) != 0) if (SAFE_F(fp, (fgetc(fp) == '/' && fgetc(fp) == 'S'))) break; else SAFE_E(fseek(fp, --pos, SEEK_SET), 0, "Failed seek to xref /Size.\n"); SAFE_E(fread(buf, 1, 21, fp), 21, "Failed to load entry Size string.\n"); xref->n_entries = atoi(buf + strlen("ize ")); xref->entries = safe_calloc(xref->n_entries * sizeof(struct _xref_entry)); /* Load entry data */ obj_id = 0; fseek(fp, xref->start + strlen("xref"), SEEK_SET); added_entries = 0; for (i=0; in_entries; i++) { /* Advance past newlines. */ c = fgetc(fp); while (c == '\n' || c == '\r') c = fgetc(fp); if (ferror(fp) || feof(fp)) break; /* Collect data up until the following newline. */ buf_idx = 0; while (c != '\n' && c != '\r' && !feof(fp) && !ferror(fp) && buf_idx < sizeof(buf)) { buf[buf_idx++] = c; c = fgetc(fp); } if (buf_idx >= sizeof(buf)) { FAIL("Failed to locate newline character. " "This might be a corrupt PDF.\n"); } buf[buf_idx] = '\0'; /* Went to far and hit start of trailer */ if (strchr(buf, 't')) break; /* Entry or object id */ if (strlen(buf) > 17) { const char *token = NULL; xref->entries[i].obj_id = obj_id++; token = strtok(buf, " "); if (!token) { FAIL("Failed to parse xref entry. " "This might be a corrupt PDF.\n"); } xref->entries[i].offset = atol(token); token = strtok(NULL, " "); if (!token) { FAIL("Failed to parse xref entry. " "This might be a corrupt PDF.\n"); } xref->entries[i].gen_num = atoi(token); xref->entries[i].f_or_n = buf[17]; ++added_entries; } else { obj_id = atoi(buf); --i; } } xref->n_entries = added_entries; fseek(fp, start, SEEK_SET); } /* Load an xref table from a stream (PDF v1.5 +) */ static void load_xref_from_stream(FILE *fp, xref_t *xref) { long start; int is_stream; char *stream; size_t size; start = ftell(fp); fseek(fp, xref->start, SEEK_SET); stream = NULL; stream = get_object_from_here(fp, &size, &is_stream); fseek(fp, start, SEEK_SET); /* TODO: decode and analyize stream */ free(stream); return; } static void get_xref_linear_skipped(FILE *fp, xref_t *xref) { int err; char ch, buf[256]; if (xref->start != 0) return; /* Special case (Linearized PDF with initial startxref at 0) */ xref->is_linear = 1; /* Seek to %%EOF */ if ((xref->end = get_next_eof(fp)) < 0) return; /* Locate the trailer */ err = 0; while (!(err = ferror(fp)) && fread(buf, 1, 8, fp)) { if (strncmp(buf, "trailer", strlen("trailer")) == 0) break; else if ((ftell(fp) - 9) < 0) return; fseek(fp, -9, SEEK_CUR); } if (err) return; /* If we found 'trailer' look backwards for 'xref' */ ch = 0; while (SAFE_F(fp, ((ch = fgetc(fp)) != 'x'))) fseek(fp, -2, SEEK_CUR); if (ch == 'x') { xref->start = ftell(fp) - 1; fseek(fp, -1, SEEK_CUR); } /* Now continue to next eof ... */ fseek(fp, xref->start, SEEK_SET); } /* This must only be called after all xref and entries have been acquired */ static void resolve_linearized_pdf(pdf_t *pdf) { int i; xref_t buf; if (pdf->n_xrefs < 2) return; if (!pdf->xrefs[0].is_linear) return; /* Swap Linear with Version 1 */ buf = pdf->xrefs[0]; pdf->xrefs[0] = pdf->xrefs[1]; pdf->xrefs[1] = buf; /* Resolve is_linear flag and version */ pdf->xrefs[0].is_linear = 1; pdf->xrefs[0].version = 1; pdf->xrefs[1].is_linear = 0; pdf->xrefs[1].version = 1; /* Adjust the other version values now */ for (i=2; in_xrefs; ++i) --pdf->xrefs[i].version; } static pdf_creator_t *new_creator(int *n_elements) { pdf_creator_t *daddy; static const pdf_creator_t creator_template[] = { {"Title", ""}, {"Author", ""}, {"Subject", ""}, {"Keywords", ""}, {"Creator", ""}, {"Producer", ""}, {"CreationDate", ""}, {"ModDate", ""}, {"Trapped", ""}, }; daddy = safe_calloc(sizeof(creator_template)); memcpy(daddy, creator_template, sizeof(creator_template)); if (n_elements) *n_elements = sizeof(creator_template) / sizeof(creator_template[0]); return daddy; } #define END_OF_TRAILER(_c, _st, _fp) \ { \ if (_c == '>') \ { \ fseek(_fp, _st, SEEK_SET); \ continue; \ } \ } static void load_creator(FILE *fp, pdf_t *pdf) { int i, buf_idx; char c, *buf, obj_id_buf[32] = {0}; long start; size_t sz; start = ftell(fp); /* For each PDF version */ for (i=0; in_xrefs; ++i) { if (!pdf->xrefs[i].version) continue; /* Find trailer */ fseek(fp, pdf->xrefs[i].start, SEEK_SET); while (SAFE_F(fp, (fgetc(fp) != 't'))) ; /* Iterate to "trailer" */ /* Look for "<< ....... /Info ......" */ c = '\0'; while (SAFE_F(fp, ((c = fgetc(fp)) != '>'))) if (SAFE_F(fp, ((c == '/') && (fgetc(fp) == 'I') && ((fgetc(fp) == 'n'))))) break; /* Could not find /Info in trailer */ END_OF_TRAILER(c, start, fp); while (SAFE_F(fp, (!isspace(c = fgetc(fp)) && (c != '>')))) ; /* Iterate to first white space /Info */ /* No space between /Info and its data */ END_OF_TRAILER(c, start, fp); while (SAFE_F(fp, (isspace(c = fgetc(fp)) && (c != '>')))) ; /* Iterate right on top of first non-whitespace /Info data */ /* No data for /Info */ END_OF_TRAILER(c, start, fp); /* Get obj id as number */ buf_idx = 0; obj_id_buf[buf_idx++] = c; while ((buf_idx < (sizeof(obj_id_buf) - 1)) && SAFE_F(fp, (!isspace(c = fgetc(fp)) && (c != '>')))) obj_id_buf[buf_idx++] = c; END_OF_TRAILER(c, start, fp); /* Get the object for the creator data. If linear, try both xrefs */ buf = get_object(fp, atoll(obj_id_buf), &pdf->xrefs[i], &sz, NULL); if (!buf && pdf->xrefs[i].is_linear && (i+1 < pdf->n_xrefs)) buf = get_object(fp, atoll(obj_id_buf), &pdf->xrefs[i+1], &sz, NULL); load_creator_from_buf(fp, &pdf->xrefs[i], buf, sz); free(buf); } fseek(fp, start, SEEK_SET); } static void load_creator_from_buf( FILE *fp, xref_t *xref, const char *buf, size_t buf_size) { int is_xml; char *c; if (!buf) return; /* Check to see if this is xml or old-school */ if ((c = strstr(buf, "/Type"))) while (*c && !isspace(*c)) ++c; /* Probably "Metadata" */ is_xml = 0; if (c && (*c == 'M')) is_xml = 1; /* Is the buffer XML(PDF 1.4+) or old format? */ if (is_xml) load_creator_from_xml(xref, buf); else load_creator_from_old_format(fp, xref, buf, buf_size); } static void load_creator_from_xml(xref_t *xref, const char *buf) { /* TODO */ } static void load_creator_from_old_format( FILE *fp, xref_t *xref, const char *buf, size_t buf_size) { int i, n_eles, length, is_escaped, obj_id; char *c, *ascii, *start, *s, *saved_buf_search, *obj; size_t obj_size; pdf_creator_t *info; info = new_creator(&n_eles); /* Mark the end of buf, so that we do not crawl past it */ if (buf_size < 1) return; const char *buf_end = buf + buf_size - 1; /* Treat 'end' as either the end of 'buf' or the end of 'obj'. Obj is if * the creator element (e.g., ModDate, Producer, etc) is an object and not * part of 'buf'. */ const char *end = buf_end; for (i=0; i= buf_end) { FAIL("Failed to locate space, likely a corrupt PDF."); } /* If looking at the start of a pdf token, we have gone too far */ if (*c == '/') continue; /* If the value is a number and not a '(' then the data is located in * an object we need to fetch, and not inline */ obj = saved_buf_search = NULL; obj_size = 0; end = buf_end; /* Init to be the buffer, this might not be an obj. */ if (isdigit(*c)) { obj_id = atoi(c); saved_buf_search = c; s = saved_buf_search; obj = get_object(fp, obj_id, xref, &obj_size, NULL); end = obj + obj_size; c = obj; /* Iterate to '(' */ while (c && (*c != '(') && (c < end)) ++c; if (c >= end) { FAIL("Failed to locate a '(' character. " "This might be a corrupt PDF.\n"); } /* Advance the search to the next token */ while (s && (*s == '/') && (s < buf_end)) ++s; if (s >= buf_end) { FAIL("Failed to locate a '/' character. " "This might be a corrupt PDF.\n"); } saved_buf_search = s; } /* Find the end of the value */ start = c; length = is_escaped = 0; while (c && ((*c != '\r') && (*c != '\n') && (*c != '<'))) { /* Bail out if we see an un-escaped ')' closing character */ if (!is_escaped && (*c == ')')) break; else if (*c == '\\') is_escaped = 1; else is_escaped = 0; ++c; ++length; if (c > end) { FAIL("Failed to locate the end of a value. " "This might be a corrupt PDF.\n"); } } if (length == 0) continue; /* Add 1 to length so it gets the closing ')' when we copy */ if (length) length += 1; length = (length > KV_MAX_VALUE_LENGTH) ? KV_MAX_VALUE_LENGTH : length; strncpy(info[i].value, start, length); info[i].value[KV_MAX_VALUE_LENGTH - 1] = '\0'; /* Restore where we were searching from */ if (saved_buf_search) { /* Release memory from get_object() called earlier */ free(obj); c = saved_buf_search; } } /* For all creation information tags */ /* Go through the values and convert if encoded */ for (i = 0; i < n_eles; ++i) { const size_t val_str_len = strnlen(info[i].value, KV_MAX_VALUE_LENGTH); if ((ascii = decode_text_string(info[i].value, val_str_len))) { strncpy(info[i].value, ascii, val_str_len); free(ascii); } } xref->creator = info; xref->n_creator_entries = n_eles; } /* Returns object data at the start of the file pointer * This interfaces to 'get_object' */ static char *get_object_from_here(FILE *fp, size_t *size, int *is_stream) { long start; char buf[256]; int obj_id; xref_t xref; xref_entry_t entry; start = ftell(fp); /* Object ID */ memset(buf, 0, 256); SAFE_E(fread(buf, 1, 255, fp), 255, "Failed to load object ID.\n"); if (!(obj_id = atoi(buf))) { fseek(fp, start, SEEK_SET); return NULL; } /* Create xref entry to pass to the get_object routine */ memset(&entry, 0, sizeof(xref_entry_t)); entry.obj_id = obj_id; entry.offset = start; /* Xref and single entry for the object we want data from */ memset(&xref, 0, sizeof(xref_t)); xref.n_entries = 1; xref.entries = &entry; fseek(fp, start, SEEK_SET); return get_object(fp, obj_id, &xref, size, is_stream); } static char *get_object( FILE *fp, int obj_id, const xref_t *xref, size_t *size, int *is_stream) { static const int blk_sz = 256; int i, total_sz, read_sz, n_blks, search, stream; size_t obj_sz; char *c, *data; long start; const xref_entry_t *entry; if (size) *size = 0; if (is_stream) *is_stream = 0; start = ftell(fp); /* Find object */ entry = NULL; for (i=0; in_entries; i++) if (xref->entries[i].obj_id == obj_id) { entry = &xref->entries[i]; break; } if (!entry) return NULL; /* Jump to object start */ fseek(fp, entry->offset, SEEK_SET); /* Initial allocation */ obj_sz = 0; /* Bytes in object */ total_sz = 0; /* Bytes read in */ n_blks = 1; data = safe_calloc(blk_sz * n_blks); /* Suck in data */ stream = 0; while ((read_sz = fread(data+total_sz, 1, blk_sz-1, fp)) && !ferror(fp)) { total_sz += read_sz; *(data + total_sz) = '\0'; if (total_sz + blk_sz >= (blk_sz * n_blks)) data = realloc(data, blk_sz * (++n_blks)); if (!data) { ERR("Failed to reallocate buffer.\n"); exit(EXIT_FAILURE); } search = total_sz - read_sz; if (search < 0) search = 0; if ((c = strstr(data + search, "endobj"))) { *(c + strlen("endobj") + 1) = '\0'; obj_sz = (char *)strstr(data + search, "endobj") - (char *)data; obj_sz += strlen("endobj") + 1; break; } else if (strstr(data, "stream")) stream = 1; } clearerr(fp); fseek(fp, start, SEEK_SET); if (size) { *size = obj_sz; if (!obj_sz && data) { free(data); data = NULL; } } if (is_stream) *is_stream = stream; return data; } static const char *get_type(FILE *fp, int obj_id, const xref_t *xref) { int is_stream; char *c, *obj, *endobj; static char buf[32]; long start; start = ftell(fp); if (!(obj = get_object(fp, obj_id, xref, NULL, &is_stream)) || is_stream || !(endobj = strstr(obj, "endobj"))) { free(obj); fseek(fp, start, SEEK_SET); if (is_stream) return "Stream"; else return "Unknown"; } /* Get the Type value (avoiding font names like Type1) */ c = obj; while ((c = strstr(c, "/Type")) && (c < endobj)) if (isdigit(*(c + strlen("/Type")))) { ++c; continue; } else break; if (!c || (c && (c > endobj))) { free(obj); fseek(fp, start, SEEK_SET); return "Unknown"; } /* Skip to first blank/whitespace */ c += strlen("/Type"); while (isspace(*c) || *c == '/') ++c; /* 'c' should be pointing to the type name. Find the end of the name. */ size_t n_chars = 0; const char *name_itr = c; while ((name_itr < endobj) && !(isspace(*name_itr) || *name_itr == '/' || *name_itr == '>')) { ++name_itr; ++n_chars; } if (n_chars >= sizeof(buf)) { free(obj); fseek(fp, start, SEEK_SET); return "Unknown"; } /* Return the value by storing it in static mem. */ memcpy(buf, c, n_chars); buf[n_chars] = '\0'; free(obj); fseek(fp, start, SEEK_SET); return buf; } static char *get_header(FILE *fp) { /* First 1024 bytes of doc must be header (1.7 spec pg 1102) */ char *header = safe_calloc(1024); long start = ftell(fp); fseek(fp, 0, SEEK_SET); SAFE_E(fread(header, 1, 1023, fp), 1023, "Failed to load PDF header.\n"); fseek(fp, start, SEEK_SET); return header; } static char *decode_text_string(const char *str, size_t str_len) { int idx, is_hex, is_utf16be, ascii_idx; char *ascii, hex_buf[5] = {0}; is_hex = is_utf16be = idx = ascii_idx = 0; /* Regular encoding */ if (str[0] == '(') { ascii = safe_calloc(str_len + 1); strncpy(ascii, str, str_len + 1); return ascii; } else if (str[0] == '<') { is_hex = 1; ++idx; } /* Text strings can be either PDFDocEncoding or UTF-16BE */ if (is_hex && (str_len > 5) && (str[idx] == 'F') && (str[idx+1] == 'E') && (str[idx+2] == 'F') && (str[idx+3] == 'F')) { is_utf16be = 1; idx += 4; } else return NULL; /* Now decode as hex */ ascii = safe_calloc(str_len); for ( ; idx. *****************************************************************************/ #ifndef PDF_H_INCLUDE #define PDF_H_INCLUDE #include /* Bit-maskable flags */ typedef unsigned short pdf_flag_t; #define PDF_FLAG_NONE 0 #define PDF_FLAG_QUIET 1 #define PDF_FLAG_DISP_CREATOR 2 /* Generic key/value structure */ #define KV_MAX_KEY_LENGTH 32 #define KV_MAX_VALUE_LENGTH 128 typedef struct _kv_t { char key[KV_MAX_KEY_LENGTH]; char value[KV_MAX_VALUE_LENGTH]; } kv_t; /* Information about who/what created the PDF * From 1.7 Spec for non-metadata entries */ typedef kv_t pdf_creator_t; typedef struct _xref_entry { int obj_id; long offset; int gen_num; char f_or_n; } xref_entry_t; typedef struct _xref_t { long start; long end; /* Array of metadata about the pdf */ pdf_creator_t *creator; int n_creator_entries; int n_entries; xref_entry_t *entries; /* PDF 1.5 or greater: xref can be encoded as a stream */ int is_stream; /* If the PDF is linear multiple xrefs make up one single version */ int is_linear; /* Version of the document this xref belongs */ int version; } xref_t; typedef struct _pdf_t { char *name; short pdf_major_version; short pdf_minor_version; int n_xrefs; xref_t *xrefs; /* PDF 1.5 or greater: xref can be encoded as a stream */ int has_xref_streams; } pdf_t; extern pdf_t *pdf_new(const char *name); extern void pdf_delete(pdf_t *pdf); extern int pdf_is_pdf(FILE *fp); extern void pdf_get_version(FILE *fp, pdf_t *pdf); extern int pdf_load_xrefs(FILE *fp, pdf_t *pdf); extern char pdf_get_object_status( const pdf_t *pdf, int xref_idx, int entry_idx); extern void pdf_zero_object( FILE *fp, const pdf_t *pdf, int xref_idx, int entry_idx); extern void pdf_summarize( FILE *fp, const pdf_t *pdf, const char *name, pdf_flag_t flags); /* Returns '1' if we successfully display data (means its probably not xml) */ extern int pdf_display_creator(const pdf_t *pdf, int xref_idx); #endif /* PDF_H_INCLUDE */ pdfresurrect-0.22/pdfresurrect.1000066400000000000000000000072221400557323600167470ustar00rootroot00000000000000.\" Hey, EMACS: -*- nroff -*- .\" First parameter, NAME, should be all caps .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection .\" other parameters are allowed: see man(7), man(1) .TH PDFRESURRECT 1 "August 2, 2020" .\" Please adjust this date whenever revising the manpage. .\" .\" Some roff macros, for reference: .\" .nh disable hyphenation .\" .hy enable hyphenation .\" .ad l left justify .\" .ad b justify to both left and right margins .\" .nf disable filling .\" .fi enable filling .\" .br insert line break .\" .sp insert n+1 empty lines .\" for manpage-specific macros, see man(7) .SH NAME pdfresurrect \- tool for extracting versioning data from PDF documents .SH SYNOPSIS .B pdfresurrect .RI " file.pdf " [-w] [-q] [-i] .SH DESCRIPTION This manual page documents briefly the .B pdfresurrect command. .PP .\" TeX users may be more comfortable with the \fB\fP and .\" \fI\fP escape sequences to invoke bold face and italics, .\" respectively. \fBpdfresurrect\fP is a tool for extracting versioning data from PDF documents. .SH OPTIONS A summary of options is included below. .TP .B \-w Write the PDF versions and summary to disk. .TP .B \-q Display only the number of versions contained in the PDF. .TP .B \-i Display the creator information from the specified PDF. .SH NOTES The scrubbing feature (\-s) should not be trusted for any serious security uses. After using this feature, please verify that it in fact zero'd all of the objects that were of concern. .PP This tool relies on the application reading the pdfresurrect extracted versions to treat the last xref(cross-reference) table as the most recent in the document. This should typically be the case. .PP The verbose output, which tries to deduce the PDF object type (e.g. stream, page), is not always accurate, and the object counts might not be 100% accurate. However, this should not prevent the extraction of the versions. This output is merely to provide a hint for the user as to what might be different between the documents. .PP Object counts might appear off in linearized PDF documents. That is not truly the case, the reason for this is that each version of the PDF consists of the objects that compose the linear portion of the PDF plus all of the objects that compose the version in question. Suppose there is a linearized PDF with 59 objects in its linear portion, and suppose the PDF has a second version that consists of 21 objects. The total number of objects in "version 2" would be 59 + 21 or 80 objects. .SH COPYRIGHT pdfresurrect 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 3 of the License, or (at your option) any later version. .PP pdfresurrect 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. .PP You should have received a copy of the GNU General Public License along with pdfresurrect. If not, see . .SH AUTHORS pdfresurrect was originally written by Matt Davis . The original man page and some additional configure and Makefile hackage was contributed by Francois Marier . .PP This manual page was originally written by Francois Marier , for the Debian project (and may be used by others). This manual page has since been modified by Matt Davis. .PP See the AUTHORS file for a list of other contributors.