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-rw-r--r--Build/source/texk/dvipdfm-x/pdfobj.c3294
1 files changed, 3294 insertions, 0 deletions
diff --git a/Build/source/texk/dvipdfm-x/pdfobj.c b/Build/source/texk/dvipdfm-x/pdfobj.c
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+++ b/Build/source/texk/dvipdfm-x/pdfobj.c
@@ -0,0 +1,3294 @@
+/*
+
+ This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
+
+ Copyright (C) 2007-2012 by Jin-Hwan Cho and Shunsaku Hirata,
+ the dvipdfmx project team.
+
+ Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
+
+ 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.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <ctype.h>
+#include <string.h>
+
+#include "system.h"
+#include "mem.h"
+#include "error.h"
+#include "mfileio.h"
+#include "dpxutil.h"
+#include "pdflimits.h"
+#include "pdfencrypt.h"
+#include "pdfparse.h"
+
+#ifdef HAVE_ZLIB
+#include <zlib.h>
+#endif /* HAVE_ZLIB */
+
+#include "pdfobj.h"
+#include "pdfdev.h"
+
+#define STREAM_ALLOC_SIZE 4096u
+#define ARRAY_ALLOC_SIZE 256
+#define IND_OBJECTS_ALLOC_SIZE 512
+
+#define OBJ_NO_OBJSTM (1 << 0)
+/* Objects with this flag will not be put into an object stream.
+ For instance, all stream objects have this flag set. */
+#define OBJ_NO_ENCRYPT (1 << 1)
+/* Objects with this flag will not be encrypted.
+ This implies OBJ_NO_OBJSTM if encryption is turned on. */
+
+/* Any of these types can be represented as follows */
+struct pdf_obj
+{
+ int type;
+
+ unsigned long label; /* Only used for indirect objects
+ all other "label" to zero */
+ unsigned short generation; /* Only used if "label" is used */
+ unsigned refcount; /* Number of links to this object */
+ int flags;
+ void *data;
+};
+
+struct pdf_boolean
+{
+ char value;
+};
+
+struct pdf_number
+{
+ double value;
+};
+
+struct pdf_string
+{
+ unsigned char *string;
+ unsigned short length;
+};
+
+struct pdf_name
+{
+ char *name;
+};
+
+struct pdf_array
+{
+ unsigned long max;
+ unsigned long size;
+ struct pdf_obj **values;
+};
+
+struct pdf_dict
+{
+ struct pdf_obj *key;
+ struct pdf_obj *value;
+ struct pdf_dict *next;
+};
+
+struct pdf_stream
+{
+ struct pdf_obj *dict;
+ unsigned char *stream;
+ long *objstm_data; /* used for object streams */
+ unsigned long stream_length;
+ unsigned long max_length;
+ unsigned char _flags;
+};
+
+struct pdf_indirect
+{
+ pdf_file *pf;
+ unsigned long label;
+ unsigned short generation;
+};
+
+typedef void pdf_null;
+typedef struct pdf_boolean pdf_boolean;
+typedef struct pdf_number pdf_number;
+typedef struct pdf_string pdf_string;
+typedef struct pdf_name pdf_name;
+typedef struct pdf_array pdf_array;
+typedef struct pdf_dict pdf_dict;
+typedef struct pdf_stream pdf_stream;
+typedef struct pdf_indirect pdf_indirect;
+
+static FILE *pdf_output_file = NULL;
+
+static long pdf_output_file_position = 0;
+static long pdf_output_line_position = 0;
+static long compression_saved = 0;
+
+#define FORMAT_BUF_SIZE 4096
+static char format_buffer[FORMAT_BUF_SIZE];
+
+typedef struct xref_entry
+{
+ unsigned char type; /* object storage type */
+ unsigned long field2; /* offset in file or object stream */
+ unsigned short field3; /* generation or index */
+ pdf_obj *direct; /* used for imported objects */
+ pdf_obj *indirect; /* used for imported objects */
+} xref_entry;
+
+static xref_entry *output_xref;
+
+static unsigned long pdf_max_ind_objects;
+static unsigned long next_label;
+
+static unsigned long startxref;
+
+struct pdf_file
+{
+ FILE *file;
+ pdf_obj *trailer;
+ xref_entry *xref_table;
+ pdf_obj *catalog;
+ long num_obj;
+ long file_size;
+ int version;
+};
+
+static pdf_obj *output_stream;
+
+#define OBJSTM_MAX_OBJS 200
+/* the limit is only 100 for linearized PDF */
+
+static int enc_mode;
+static int doc_enc_mode;
+
+static pdf_obj *trailer_dict;
+static pdf_obj *xref_stream;
+
+/* Internal static routines */
+
+static int check_for_pdf_version (FILE *file);
+
+static void pdf_flush_obj (pdf_obj *object, FILE *file);
+static void pdf_label_obj (pdf_obj *object);
+static void pdf_write_obj (pdf_obj *object, FILE *file);
+
+static void set_objstm_data (pdf_obj *objstm, long *data);
+static long *get_objstm_data (pdf_obj *objstm);
+static void release_objstm (pdf_obj *objstm);
+
+static void pdf_out_char (FILE *file, char c);
+static void pdf_out (FILE *file, const void *buffer, long length);
+
+static void release_indirect (pdf_indirect *data);
+static void write_indirect (pdf_indirect *indirect, FILE *file);
+
+static void release_boolean (pdf_obj *data);
+static void write_boolean (pdf_boolean *data, FILE *file);
+
+static void release_null (pdf_null *data);
+static void write_null (pdf_null *data, FILE *file);
+
+static void release_number (pdf_number *number);
+static void write_number (pdf_number *number, FILE *file);
+
+static void write_string (pdf_string *str, FILE *file);
+static void release_string (pdf_string *str);
+
+static void write_name (pdf_name *name, FILE *file);
+static void release_name (pdf_name *name);
+
+static void write_array (pdf_array *array, FILE *file);
+static void release_array (pdf_array *array);
+
+static void write_dict (pdf_dict *dict, FILE *file);
+static void release_dict (pdf_dict *dict);
+
+static void write_stream (pdf_stream *stream, FILE *file);
+static void release_stream (pdf_stream *stream);
+
+static int verbose = 0;
+static char compression_level = 9;
+
+void
+pdf_set_compression (int level)
+{
+#ifndef HAVE_ZLIB
+ ERROR("You don't have compression compiled in. Possibly libz wasn't found by configure.");
+#else
+#ifndef HAVE_ZLIB_COMPRESS2
+ if (level != 0)
+ WARN("Unable to set compression level -- your zlib doesn't have compress2().");
+#endif
+ if (level >= 0 && level <= 9)
+ compression_level = level;
+ else {
+ ERROR("set_compression: invalid compression level: %d", level);
+ }
+#endif /* !HAVE_ZLIB */
+
+ return;
+}
+
+static unsigned pdf_version = PDF_VERSION_DEFAULT;
+
+void
+pdf_set_version (unsigned version)
+{
+ /* Don't forget to update CIDFont_stdcc_def[] in cid.c too! */
+ if (version >= PDF_VERSION_MIN && version <= PDF_VERSION_MAX) {
+ pdf_version = version;
+ }
+}
+
+unsigned
+pdf_get_version (void)
+{
+ return pdf_version;
+}
+
+int
+pdf_obj_get_verbose(void)
+{
+ return verbose;
+}
+
+void
+pdf_obj_set_verbose(void)
+{
+ verbose++;
+}
+
+static pdf_obj *current_objstm = NULL;
+static int do_objstm;
+
+static void
+add_xref_entry (unsigned long label, unsigned char type, unsigned long field2, unsigned short field3)
+{
+ if (label >= pdf_max_ind_objects) {
+ pdf_max_ind_objects = (label/IND_OBJECTS_ALLOC_SIZE+1)*IND_OBJECTS_ALLOC_SIZE;
+ output_xref = RENEW(output_xref, pdf_max_ind_objects, xref_entry);
+ }
+
+ output_xref[label].type = type;
+ output_xref[label].field2 = field2;
+ output_xref[label].field3 = field3;
+ output_xref[label].direct = NULL;
+ output_xref[label].indirect = NULL;
+}
+
+#define BINARY_MARKER "%\344\360\355\370\n"
+void
+pdf_out_init (const char *filename, int do_encryption)
+{
+ char v;
+
+ output_xref = NULL;
+ pdf_max_ind_objects = 0;
+ add_xref_entry(0, 0, 0, 0xffff);
+ next_label = 1;
+
+ if (pdf_version >= 5) {
+ xref_stream = pdf_new_stream(STREAM_COMPRESS);
+ xref_stream->flags |= OBJ_NO_ENCRYPT;
+ trailer_dict = pdf_stream_dict(xref_stream);
+ pdf_add_dict(trailer_dict, pdf_new_name("Type"), pdf_new_name("XRef"));
+ do_objstm = 1;
+ } else {
+ xref_stream = NULL;
+ trailer_dict = pdf_new_dict();
+ do_objstm = 0;
+ }
+
+ output_stream = NULL;
+
+#ifdef XETEX
+ if (filename == NULL) { /* no filename: writing to stdout */
+#ifdef WIN32
+ setmode(fileno(stdout), _O_BINARY);
+#endif
+ pdf_output_file = stdout;
+ } else
+#endif
+ {
+ pdf_output_file = MFOPEN(filename, FOPEN_WBIN_MODE);
+ if (!pdf_output_file) {
+ if (strlen(filename) < 128)
+ ERROR("Unable to open \"%s\".", filename);
+ else
+ ERROR("Unable to open file.");
+ }
+ }
+ pdf_out(pdf_output_file, "%PDF-1.", strlen("%PDF-1."));
+ v = '0' + pdf_version;
+ pdf_out(pdf_output_file, &v, 1);
+ pdf_out(pdf_output_file, "\n", 1);
+ pdf_out(pdf_output_file, BINARY_MARKER, strlen(BINARY_MARKER));
+
+ enc_mode = 0;
+ doc_enc_mode = do_encryption;
+}
+
+static void
+dump_xref_table (void)
+{
+ long length;
+ unsigned long i;
+
+ pdf_out(pdf_output_file, "xref\n", 5);
+
+ length = sprintf(format_buffer, "%d %lu\n", 0, next_label);
+ pdf_out(pdf_output_file, format_buffer, length);
+
+ /*
+ * Every space counts. The space after the 'f' and 'n' is * *essential*.
+ * The PDF spec says the lines must be 20 characters long including the
+ * end of line character.
+ */
+ for (i = 0; i < next_label; i++) {
+ unsigned char type = output_xref[i].type;
+ if (type > 1)
+ ERROR("object type %hu not allowed in xref table", type);
+ length = sprintf(format_buffer, "%010lu %05hu %c \n",
+ output_xref[i].field2, output_xref[i].field3,
+ type ? 'n' : 'f');
+ pdf_out(pdf_output_file, format_buffer, length);
+ }
+}
+
+static void
+dump_trailer_dict (void)
+{
+ pdf_out(pdf_output_file, "trailer\n", 8);
+ enc_mode = 0;
+ write_dict(trailer_dict->data, pdf_output_file);
+ pdf_release_obj(trailer_dict);
+ pdf_out_char(pdf_output_file, '\n');
+}
+
+/*
+ * output a PDF 1.5 cross-reference stream;
+ * contributed by Matthias Franz (March 21, 2007)
+ */
+static void
+dump_xref_stream (void)
+{
+ unsigned long pos, i;
+ unsigned poslen;
+ unsigned char buf[7] = {0, 0, 0, 0, 0};
+
+ pdf_obj *w;
+
+ /* determine the necessary size of the offset field */
+ pos = startxref; /* maximal offset value */
+ poslen = 1;
+ while (pos >>= 8)
+ poslen++;
+
+ w = pdf_new_array();
+ pdf_add_array(w, pdf_new_number(1)); /* type */
+ pdf_add_array(w, pdf_new_number(poslen)); /* offset (big-endian) */
+ pdf_add_array(w, pdf_new_number(2)); /* generation */
+ pdf_add_dict(trailer_dict, pdf_new_name("W"), w);
+
+ /* We need the xref entry for the xref stream right now */
+ add_xref_entry(next_label-1, 1, startxref, 0);
+
+ for (i = 0; i < next_label; i++) {
+ unsigned j;
+ unsigned short f3;
+ buf[0] = output_xref[i].type;
+ pos = output_xref[i].field2;
+ for (j = poslen; j--; ) {
+ buf[1+j] = (unsigned char) pos;
+ pos >>= 8;
+ }
+ f3 = output_xref[i].field3;
+ buf[poslen+1] = (unsigned char) (f3 >> 8);
+ buf[poslen+2] = (unsigned char) (f3);
+ pdf_add_stream(xref_stream, &buf, poslen+3);
+ }
+
+ pdf_release_obj(xref_stream);
+}
+
+void
+pdf_out_flush (void)
+{
+ if (pdf_output_file) {
+ long length;
+
+ /* Flush current object stream */
+ if (current_objstm) {
+ release_objstm(current_objstm);
+ current_objstm =NULL;
+ }
+
+ /*
+ * Label xref stream - we need the number of correct objects
+ * for the xref stream dictionary (= trailer).
+ * Labelling it in pdf_out_init (with 1) does not work (why?).
+ */
+ if (xref_stream)
+ pdf_label_obj(xref_stream);
+
+ /* Record where this xref is for trailer */
+ startxref = pdf_output_file_position;
+
+ pdf_add_dict(trailer_dict, pdf_new_name("Size"),
+ pdf_new_number(next_label));
+
+ if (xref_stream)
+ dump_xref_stream();
+ else {
+ dump_xref_table();
+ dump_trailer_dict();
+ }
+
+ /* Done with xref table */
+ RELEASE(output_xref);
+
+ pdf_out(pdf_output_file, "startxref\n", 10);
+ length = sprintf(format_buffer, "%lu\n", startxref);
+ pdf_out(pdf_output_file, format_buffer, length);
+ pdf_out(pdf_output_file, "%%EOF\n", 6);
+
+ MESG("\n");
+ if (verbose) {
+ if (compression_level > 0) {
+ MESG("Compression saved %ld bytes%s\n", compression_saved,
+ pdf_version < 5 ? ". Try \"-V 5\" for better compression" : "");
+ }
+ }
+ MESG("%ld bytes written", pdf_output_file_position);
+
+ MFCLOSE(pdf_output_file);
+ }
+}
+
+void
+pdf_error_cleanup (void)
+{
+ /*
+ * This routine is the cleanup required for an abnormal exit.
+ * For now, simply close the file.
+ */
+ if (pdf_output_file)
+ MFCLOSE(pdf_output_file);
+}
+
+
+void
+pdf_set_root (pdf_obj *object)
+{
+ if (pdf_add_dict(trailer_dict, pdf_new_name("Root"), pdf_ref_obj(object))) {
+ ERROR("Root object already set!");
+ }
+ /* Adobe Readers don't like a document catalog inside an encrypted
+ * object stream, although the PDF v1.5 spec seems to allow this.
+ * Note that we don't set OBJ_NO_ENCRYPT since the name dictionary in
+ * a document catalog may contain strings, which should be encrypted.
+ */
+ if (doc_enc_mode)
+ object->flags |= OBJ_NO_OBJSTM;
+}
+
+void
+pdf_set_info (pdf_obj *object)
+{
+ if (pdf_add_dict(trailer_dict, pdf_new_name("Info"), pdf_ref_obj(object))) {
+ ERROR ("Info object already set!");
+ }
+}
+
+void
+pdf_set_id (pdf_obj *id)
+{
+ if (pdf_add_dict(trailer_dict, pdf_new_name("ID"), id)) {
+ ERROR ("ID already set!");
+ }
+}
+
+void
+pdf_set_encrypt (pdf_obj *encrypt)
+{
+ if (pdf_add_dict(trailer_dict, pdf_new_name("Encrypt"), pdf_ref_obj(encrypt))) {
+ ERROR("Encrypt object already set!");
+ }
+ encrypt->flags |= OBJ_NO_ENCRYPT;
+}
+
+static
+void pdf_out_char (FILE *file, char c)
+{
+ if (output_stream && file == pdf_output_file)
+ pdf_add_stream(output_stream, &c, 1);
+ else {
+ fputc(c, file);
+ /* Keep tallys for xref table *only* if writing a pdf file. */
+ if (file == pdf_output_file) {
+ pdf_output_file_position += 1;
+ if (c == '\n')
+ pdf_output_line_position = 0;
+ else
+ pdf_output_line_position += 1;
+ }
+ }
+}
+
+static char xchar[] = "0123456789abcdef";
+
+#define pdf_out_xchar(f,c) do {\
+ pdf_out_char((f), xchar[((c) >> 4) & 0x0f]);\
+ pdf_out_char((f), xchar[(c) & 0x0f]);\
+} while (0)
+
+static
+void pdf_out (FILE *file, const void *buffer, long length)
+{
+ if (output_stream && file == pdf_output_file)
+ pdf_add_stream(output_stream, buffer, length);
+ else {
+ fwrite(buffer, 1, length, file);
+ /* Keep tallys for xref table *only* if writing a pdf file */
+ if (file == pdf_output_file) {
+ pdf_output_file_position += length;
+ pdf_output_line_position += length;
+ /* "foo\nbar\n "... */
+ if (length > 0 &&
+ ((const char *)buffer)[length-1] == '\n')
+ pdf_output_line_position = 0;
+ }
+ }
+}
+
+/* returns 1 if a white-space character is necessary to separate
+ an object of type1 followed by an object of type2 */
+static
+int pdf_need_white (int type1, int type2)
+{
+ return !(type1 == PDF_STRING || type1 == PDF_ARRAY || type1 == PDF_DICT ||
+ type2 == PDF_STRING || type2 == PDF_NAME ||
+ type2 == PDF_ARRAY || type2 == PDF_DICT);
+}
+
+static
+void pdf_out_white (FILE *file)
+{
+ if (file == pdf_output_file && pdf_output_line_position >= 80) {
+ pdf_out_char(file, '\n');
+ } else {
+ pdf_out_char(file, ' ');
+ }
+}
+
+#define TYPECHECK(o,t) if (!(o) || (o)->type != (t)) {\
+ ERROR("typecheck: Invalid object type: %d %d (line %d)", (o) ? (o)->type : -1, (t), __LINE__);\
+}
+
+#define INVALIDOBJ(o) ((o) == NULL || (o)->type <= 0 || (o)->type > PDF_UNDEFINED)
+
+static pdf_obj *
+pdf_new_obj(int type)
+{
+ pdf_obj *result;
+
+ if (type >= PDF_UNDEFINED || type < 0)
+ ERROR("Invalid object type: %d", type);
+
+ result = NEW(1, pdf_obj);
+ result->type = type;
+ result->data = NULL;
+ result->label = 0;
+ result->generation = 0;
+ result->refcount = 1;
+ result->flags = 0;
+
+ return result;
+}
+
+int
+pdf_obj_typeof (pdf_obj *object)
+{
+ if (INVALIDOBJ(object))
+ return PDF_OBJ_INVALID;
+
+ return object->type;
+}
+
+static void
+pdf_label_obj (pdf_obj *object)
+{
+ if (INVALIDOBJ(object))
+ ERROR("pdf_label_obj(): passed invalid object.");
+
+ /*
+ * Don't change label on an already labeled object. Ignore such calls.
+ */
+ if (object->label == 0) {
+ object->label = next_label++;
+ object->generation = 0;
+ }
+}
+
+#ifndef XETEX
+/*
+ * Transfer the label assigned to the object src to the object dst.
+ * The object dst must not yet have been labeled.
+ */
+void
+pdf_transfer_label (pdf_obj *dst, pdf_obj *src)
+{
+ ASSERT(dst && !dst->label && src);
+
+ dst->label = src->label;
+ dst->generation = src->generation;
+ src->label = 0;
+ src->generation = 0;
+}
+#endif
+
+/*
+ * This doesn't really copy the object, but allows it to be used without
+ * fear that somebody else will free it.
+ */
+pdf_obj *
+pdf_link_obj (pdf_obj *object)
+{
+ if (INVALIDOBJ(object))
+ ERROR("pdf_link_obj(): passed invalid object.");
+
+ object->refcount += 1;
+
+ return object;
+}
+
+
+pdf_obj *
+pdf_ref_obj (pdf_obj *object)
+{
+ if (INVALIDOBJ(object))
+ ERROR("pdf_ref_obj(): passed invalid object.");
+
+ if (object->refcount == 0) {
+ MESG("\nTrying to refer already released object!!!\n");
+ pdf_write_obj(object, stderr);
+ ERROR("Cannot continue...");
+ }
+
+ if (PDF_OBJ_INDIRECTTYPE(object)) {
+ return pdf_link_obj(object);
+ } else {
+ if (object->label == 0) {
+ pdf_label_obj(object);
+ }
+ return pdf_new_indirect(NULL, object->label, object->generation);
+ }
+}
+
+static void
+release_indirect (pdf_indirect *data)
+{
+ RELEASE(data);
+}
+
+static void
+write_indirect (pdf_indirect *indirect, FILE *file)
+{
+ long length;
+
+ ASSERT(!indirect->pf);
+
+ length = sprintf(format_buffer, "%lu %hu R", indirect->label, indirect->generation);
+ pdf_out(file, format_buffer, length);
+}
+
+#ifndef XETEX
+/* The undefined object is used as a placeholder in pdfnames.c
+ * for objects which are referenced before they are defined.
+ */
+pdf_obj *
+pdf_new_undefined (void)
+{
+ pdf_obj *result;
+
+ result = pdf_new_obj(PDF_UNDEFINED);
+ result->data = NULL;
+
+ return result;
+}
+#endif
+
+pdf_obj *
+pdf_new_null (void)
+{
+ pdf_obj *result;
+
+ result = pdf_new_obj(PDF_NULL);
+ result->data = NULL;
+
+ return result;
+}
+
+static void
+release_null (pdf_null *obj)
+{
+ return;
+}
+
+static void
+write_null (pdf_null *obj, FILE *file)
+{
+ pdf_out(file, "null", 4);
+}
+
+pdf_obj *
+pdf_new_boolean (char value)
+{
+ pdf_obj *result;
+ pdf_boolean *data;
+
+ result = pdf_new_obj(PDF_BOOLEAN);
+ data = NEW(1, pdf_boolean);
+ data->value = value;
+ result->data = data;
+
+ return result;
+}
+
+static void
+release_boolean (pdf_obj *data)
+{
+ RELEASE (data);
+}
+
+static void
+write_boolean (pdf_boolean *data, FILE *file)
+{
+ if (data->value) {
+ pdf_out(file, "true", 4);
+ } else {
+ pdf_out(file, "false", 5);
+ }
+}
+
+#ifdef XETEX
+void
+pdf_set_boolean (pdf_obj *object, char value)
+{
+ pdf_boolean *data;
+
+ TYPECHECK(object, PDF_BOOLEAN);
+
+ data = object->data;
+ data->value = value;
+}
+#endif
+
+char
+pdf_boolean_value (pdf_obj *object)
+{
+ pdf_boolean *data;
+
+ TYPECHECK(object, PDF_BOOLEAN);
+
+ data = object->data;
+
+ return data->value;
+}
+
+pdf_obj *
+pdf_new_number (double value)
+{
+ pdf_obj *result;
+ pdf_number *data;
+
+ result = pdf_new_obj(PDF_NUMBER);
+ data = NEW(1, pdf_number);
+ data->value = value;
+ result->data = data;
+
+ return result;
+}
+
+static void
+release_number (pdf_number *data)
+{
+ RELEASE (data);
+}
+
+static void
+write_number (pdf_number *number, FILE *file)
+{
+ int count;
+
+ count = pdf_sprint_number(format_buffer, number->value);
+
+ pdf_out(file, format_buffer, count);
+}
+
+
+void
+pdf_set_number (pdf_obj *object, double value)
+{
+ pdf_number *data;
+
+ TYPECHECK(object, PDF_NUMBER);
+
+ data = object->data;
+ data->value = value;
+}
+
+double
+pdf_number_value (pdf_obj *object)
+{
+ pdf_number *data;
+
+ TYPECHECK(object, PDF_NUMBER);
+
+ data = object->data;
+
+ return data->value;
+}
+
+pdf_obj *
+pdf_new_string (const void *str, unsigned length)
+{
+ pdf_obj *result;
+ pdf_string *data;
+
+ ASSERT(str);
+
+ result = pdf_new_obj(PDF_STRING);
+ data = NEW(1, pdf_string);
+ result->data = data;
+ data->length = length;
+
+ if (length) {
+ data->string = NEW(length+1, unsigned char);
+ memcpy(data->string, str, length);
+ /* Shouldn't assume NULL terminated. */
+ data->string[length] = '\0';
+ } else
+ data->string = NULL;
+
+ return result;
+}
+
+void *
+pdf_string_value (pdf_obj *object)
+{
+ pdf_string *data;
+
+ TYPECHECK(object, PDF_STRING);
+
+ data = object->data;
+
+ return data->string;
+}
+
+unsigned
+pdf_string_length (pdf_obj *object)
+{
+ pdf_string *data;
+
+ TYPECHECK(object, PDF_STRING);
+
+ data = object->data;
+
+ return (unsigned) (data->length);
+}
+
+/*
+ * This routine escapes non printable characters and control
+ * characters in an output string.
+ */
+int
+pdfobj_escape_str (char *buffer, int bufsize, const unsigned char *s, int len)
+{
+ int result = 0;
+ int i;
+
+ for (i = 0; i < len; i++) {
+ unsigned char ch;
+
+ ch = s[i];
+ if (result > bufsize - 4)
+ ERROR("pdfobj_escape_str: Buffer overflow");
+
+ /*
+ * We always write three octal digits. Optimization only gives few Kb
+ * smaller size for most documents when zlib compressed.
+ */
+ if (ch < 32 || ch > 126) {
+ buffer[result++] = '\\';
+#if 0
+ if (i < len - 1 && !isdigit(s[i+1]))
+ result += sprintf(buffer+result, "%o", ch);
+ else
+ result += sprintf(buffer+result, "%03o", ch);
+#endif
+ result += sprintf(buffer+result, "%03o", ch);
+ } else {
+ switch (ch) {
+ case '(':
+ buffer[result++] = '\\';
+ buffer[result++] = '(';
+ break;
+ case ')':
+ buffer[result++] = '\\';
+ buffer[result++] = ')';
+ break;
+ case '\\':
+ buffer[result++] = '\\';
+ buffer[result++] = '\\';
+ break;
+ default:
+ buffer[result++] = ch;
+ break;
+ }
+ }
+ }
+
+ return result;
+}
+
+static void
+write_string (pdf_string *str, FILE *file)
+{
+ unsigned char *s;
+ char wbuf[FORMAT_BUF_SIZE]; /* Shouldn't use format_buffer[]. */
+ int nescc = 0, i, count;
+
+ s = str->string;
+
+ if (enc_mode)
+ pdf_encrypt_data(s, str->length);
+
+ /*
+ * Count all ASCII non-printable characters.
+ */
+ for (i = 0; i < str->length; i++) {
+ if (!isprint(s[i]))
+ nescc++;
+ }
+ /*
+ * If the string contains much escaped chars, then we write it as
+ * ASCII hex string.
+ */
+ if (nescc > str->length / 3) {
+ pdf_out_char(file, '<');
+ for (i = 0; i < str->length; i++) {
+ pdf_out_xchar(file, s[i]);
+ }
+ pdf_out_char(file, '>');
+ } else {
+ pdf_out_char(file, '(');
+ /*
+ * This section of code probably isn't speed critical. Escaping the
+ * characters in the string one at a time may seem slow, but it's
+ * safe if the formatted string length exceeds FORMAT_BUF_SIZE.
+ * Occasionally you see some long strings in PDF. pdfobj_escape_str
+ * is also used for strings of text with no kerning. These must be
+ * handled as quickly as possible since there are so many of them.
+ */
+ for (i = 0; i < str->length; i++) {
+ count = pdfobj_escape_str(wbuf, FORMAT_BUF_SIZE, &(s[i]), 1);
+ pdf_out(file, wbuf, count);
+ }
+ pdf_out_char(file, ')');
+ }
+}
+
+static void
+release_string (pdf_string *data)
+{
+ if (data->string != NULL) {
+ RELEASE(data->string);
+ data->string = NULL;
+ }
+ RELEASE(data);
+}
+
+void
+pdf_set_string (pdf_obj *object, unsigned char *str, unsigned length)
+{
+ pdf_string *data;
+
+ TYPECHECK(object, PDF_STRING);
+
+ data = object->data;
+ if (data->string != 0) {
+ RELEASE(data->string);
+ }
+ if (length != 0) {
+ data->length = length;
+ data->string = NEW(length + 1, unsigned char);
+ memcpy(data->string, str, length);
+ data->string[length] = '\0';
+ } else {
+ data->length = 0;
+ data->string = NULL;
+ }
+}
+
+/* Name does *not* include the /. */
+pdf_obj *
+pdf_new_name (const char *name)
+{
+ pdf_obj *result;
+ unsigned length;
+ pdf_name *data;
+
+ result = pdf_new_obj(PDF_NAME);
+ data = NEW (1, pdf_name);
+ result->data = data;
+ length = strlen(name);
+ if (length != 0) {
+ data->name = NEW(length+1, char);
+ memcpy(data->name, name, length);
+ data->name[length] = '\0';
+ } else {
+ data->name = NULL;
+ }
+
+ return result;
+}
+
+static void
+write_name (pdf_name *name, FILE *file)
+{
+ char *s;
+ int i, length;
+
+ s = name->name;
+ length = name->name ? strlen(name->name) : 0;
+ /*
+ * From PDF Reference, 3rd ed., p.33:
+ *
+ * Beginning with PDF 1.2, any character except null (character code 0)
+ * may be included in a name by writing its 2-digit hexadecimal code,
+ * preceded bythe number sign character (#); see implementation notes 3
+ * and 4 in Appendix H. This syntax is required in order to represent
+ * any of the delimiter or white-space characters or the number sign
+ * character itself; it is recommended but not required for characters
+ * whose codes are outside the range 33 (!) to 126 (~).
+ */
+#ifndef is_delim
+ /* Avoid '{' and '}' for PostScript compatibility? */
+#define is_delim(c) ((c) == '(' || (c) == '/' || \
+ (c) == '<' || (c) == '>' || \
+ (c) == '[' || (c) == ']' || \
+ (c) == '{' || (c) == '}' || \
+ (c) == '%')
+#endif
+ pdf_out_char(file, '/');
+ for (i = 0; i < length; i++) {
+ if (s[i] < '!' || s[i] > '~' || s[i] == '#' || is_delim(s[i])) {
+ /* ^ "space" is here. */
+ pdf_out_char (file, '#');
+ pdf_out_xchar(file, s[i]);
+ } else {
+ pdf_out_char (file, s[i]);
+ }
+ }
+}
+
+static void
+release_name (pdf_name *data)
+{
+ if (data->name != NULL) {
+ RELEASE(data->name);
+ data->name = NULL;
+ }
+ RELEASE(data);
+}
+
+#ifdef XETEX
+void
+pdf_set_name (pdf_obj *object, const char *name)
+{
+ pdf_name *data;
+ unsigned length;
+
+ TYPECHECK(object, PDF_NAME);
+
+ length = strlen(name);
+ data = object->data;
+ if (data->name != NULL) {
+ RELEASE(data->name);
+ }
+ if (length != 0) {
+ data->name = NEW(length+1, char);
+ memcpy(data->name, name, length);
+ data->name[length] = 0;
+ } else {
+ data->name = NULL;
+ }
+}
+#endif
+
+char *
+pdf_name_value (pdf_obj *object)
+{
+ pdf_name *data;
+
+ TYPECHECK(object, PDF_NAME);
+
+ data = object->data;
+
+ return data->name;
+}
+
+/*
+ * We do not have pdf_name_length() since '\0' is not allowed
+ * in PDF name object.
+ */
+
+pdf_obj *
+pdf_new_array (void)
+{
+ pdf_obj *result;
+ pdf_array *data;
+
+ result = pdf_new_obj(PDF_ARRAY);
+ data = NEW(1, pdf_array);
+ data->values = NULL;
+ data->max = 0;
+ data->size = 0;
+ result->data = data;
+
+ return result;
+}
+
+static void
+write_array (pdf_array *array, FILE *file)
+{
+ pdf_out_char(file, '[');
+ if (array->size > 0) {
+ unsigned long i;
+ int type1 = PDF_UNDEFINED, type2;
+
+ for (i = 0; i < array->size; i++) {
+ if (array->values[i]) {
+ type2 = array->values[i]->type;
+ if (type1 != PDF_UNDEFINED && pdf_need_white(type1, type2))
+ pdf_out_white(file);
+ type1 = type2;
+ pdf_write_obj(array->values[i], file);
+ } else
+ WARN("PDF array element #ld undefined.", i);
+ }
+ }
+ pdf_out_char(file, ']');
+}
+
+pdf_obj *
+pdf_get_array (pdf_obj *array, long idx)
+{
+ pdf_obj *result = NULL;
+ pdf_array *data;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = array->data;
+ if (idx < 0)
+ result = data->values[idx + data->size];
+ else if (idx < data->size) {
+ result = data->values[idx];
+ }
+
+ return result;
+}
+
+unsigned int
+pdf_array_length (pdf_obj *array)
+{
+ pdf_array *data;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = (pdf_array *) array->data;
+
+ return (unsigned int) data->size;
+}
+
+static void
+release_array (pdf_array *data)
+{
+ unsigned long i;
+
+ if (data->values) {
+ for (i = 0; i < data->size; i++) {
+ pdf_release_obj(data->values[i]);
+ data->values[i] = NULL;
+ }
+ RELEASE(data->values);
+ data->values = NULL;
+ }
+ RELEASE(data);
+}
+
+/*
+ * The name pdf_add_array is misleading. It behaves differently than
+ * pdf_add_dict(). This should be pdf_push_array().
+ */
+void
+pdf_add_array (pdf_obj *array, pdf_obj *object)
+{
+ pdf_array *data;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = array->data;
+ if (data->size >= data->max) {
+ data->max += ARRAY_ALLOC_SIZE;
+ data->values = RENEW(data->values, data->max, pdf_obj *);
+ }
+ data->values[data->size] = object;
+ data->size++;
+
+ return;
+}
+
+#if 0
+void
+pdf_put_array (pdf_obj *array, unsigned idx, pdf_obj *object)
+{
+ pdf_array *data;
+ long i;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = array->data;
+ if (idx + 1 > data->max) {
+ data->max += ARRAY_ALLOC_SIZE;
+ data->values = RENEW(data->values, data->max, pdf_obj *);
+ }
+ /*
+ * Rangecheck error in PostScript interpreters if
+ * idx > data->size - 1. But pdf_new_array() doesn't set
+ * array size, pdf_add_array() dynamically increases size
+ * of array. This might confusing...
+ */
+ if (idx + 1 > data->size) {
+ for (i = data->size; i < idx; i++)
+ data->values[i] = pdf_new_null(); /* release_array() won't work without this */
+ data->values[idx] = object;
+ data->size = idx + 1;
+ } else {
+ if (data->values[idx])
+ pdf_release_obj(data->values[idx]);
+ data->values[idx] = object;
+ }
+}
+
+/* Easily leaks memory... */
+pdf_obj *
+pdf_shift_array (pdf_obj *array)
+{
+ pdf_obj *result = NULL;
+ pdf_array *data;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = array->data;
+ if (data->size > 0) {
+ int i;
+
+ result = data->values[0];
+ for (i = 1; i < data->size; i++)
+ data->values[i-1] = data->values[i];
+ data->size--;
+ }
+
+ return result;
+}
+#endif
+
+/* Prepend an object to an array */
+void
+pdf_unshift_array (pdf_obj *array, pdf_obj *object)
+{
+ pdf_array *data;
+ int i;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = array->data;
+ if (data->size >= data->max) {
+ data->max += ARRAY_ALLOC_SIZE;
+ data->values = RENEW(data->values, data->max, pdf_obj *);
+ }
+ for (i = 0; i < data->size; i++)
+ data->values[i+1] = data->values[i];
+ data->values[0] = object;
+ data->size++;
+}
+
+#if 0
+pdf_obj *
+pdf_pop_array (pdf_obj *array)
+{
+ pdf_obj *result;
+ pdf_array *data;
+
+ TYPECHECK(array, PDF_ARRAY);
+
+ data = array->data;
+ if (data->size > 0) {
+ result = data->values[data->size - 1];
+ data->size--;
+ } else {
+ result = NULL;
+ }
+
+ return result;
+}
+#endif
+
+static void
+write_dict (pdf_dict *dict, FILE *file)
+{
+#ifdef XETEX
+ pdf_out (file, "<<\n", 3); /* dropping \n saves few kb. */
+#else
+ pdf_out (file, "<<", 2);
+#endif
+ while (dict->key != NULL) {
+ pdf_write_obj(dict->key, file);
+ if (pdf_need_white(PDF_NAME, (dict->value)->type)) {
+ pdf_out_white(file);
+ }
+ pdf_write_obj(dict->value, file);
+#ifdef XETEX
+ pdf_out_char (file, '\n'); /* removing this saves few kb. */
+#endif
+ dict = dict->next;
+ }
+ pdf_out(file, ">>", 2);
+}
+
+pdf_obj *
+pdf_new_dict (void)
+{
+ pdf_obj *result;
+ pdf_dict *data;
+
+ result = pdf_new_obj(PDF_DICT);
+ data = NEW(1, pdf_dict);
+ data->key = NULL;
+ data->value = NULL;
+ data->next = NULL;
+ result->data = data;
+
+ return result;
+}
+
+static void
+release_dict (pdf_dict *data)
+{
+ pdf_dict *next;
+
+ while (data != NULL && data->key != NULL) {
+ pdf_release_obj(data->key);
+ pdf_release_obj(data->value);
+ data->key = NULL;
+ data->value = NULL;
+ next = data->next;
+ RELEASE(data);
+ data = next;
+ }
+ RELEASE(data);
+}
+
+/* Array is ended by a node with NULL this pointer */
+/* pdf_add_dict returns 0 if the key is new and non-zero otherwise */
+int
+pdf_add_dict (pdf_obj *dict, pdf_obj *key, pdf_obj *value)
+{
+ pdf_dict *data, *new_node;
+
+ TYPECHECK(dict, PDF_DICT);
+ TYPECHECK(key, PDF_NAME);
+
+ /* It seems that NULL is sometimes used for null object... */
+ if (value != NULL && INVALIDOBJ(value))
+ ERROR("pdf_add_dict(): Passed invalid value");
+
+ /* If this key already exists, simply replace the value */
+ for (data = dict->data; data->key != NULL; data = data->next) {
+ if (!strcmp(pdf_name_value(key), pdf_name_value(data->key))) {
+ /* Release the old value */
+ pdf_release_obj(data->value);
+ /* Release the new key (we don't need it) */
+ pdf_release_obj(key);
+ data->value = value;
+ return 1;
+ }
+ }
+ /*
+ * We didn't find the key. We build a new "end" node and add
+ * the new key just before the end
+ */
+ new_node = NEW (1, pdf_dict);
+ new_node->key = NULL;
+ new_node->value = NULL;
+ new_node->next = NULL;
+ data->next = new_node;
+ data->key = key;
+ data->value = value;
+ return 0;
+}
+
+#if 0
+void
+pdf_put_dict (pdf_obj *dict, const char *key, pdf_obj *value)
+{
+ pdf_dict *data;
+
+ TYPECHECK(dict, PDF_DICT);
+
+ if (!key) {
+ ERROR("pdf_put_dict(): Passed invalid key.");
+ }
+ /* It seems that NULL is sometimes used for null object... */
+ if (value != NULL && INVALIDOBJ(value)) {
+ ERROR("pdf_add_dict(): Passed invalid value.");
+ }
+
+ data = dict->data;
+
+ while (data->key != NULL) {
+ if (!strcmp(key, pdf_name_value(data->key))) {
+ pdf_release_obj(data->value);
+ data->value = value;
+ break;
+ }
+ data = data->next;
+ }
+
+ /*
+ * If we didn't find the key, build a new "end" node and add
+ * the new key just before the end
+ */
+ if (data->key == NULL) {
+ pdf_dict *new_node;
+
+ new_node = NEW (1, pdf_dict);
+ new_node->key = NULL;
+ new_node->value = NULL;
+ new_node->next = NULL;
+ data->next = new_node;
+ data->key = pdf_new_name(key);
+ data->value = value;
+ }
+}
+#endif
+
+/* pdf_merge_dict makes a link for each item in dict2 before stealing it */
+void
+pdf_merge_dict (pdf_obj *dict1, pdf_obj *dict2)
+{
+ pdf_dict *data;
+
+ TYPECHECK(dict1, PDF_DICT);
+ TYPECHECK(dict2, PDF_DICT);
+
+ data = dict2->data;
+ while (data->key != NULL) {
+ pdf_add_dict(dict1, pdf_link_obj(data->key), pdf_link_obj(data->value));
+ data = data->next;
+ }
+}
+
+int
+pdf_foreach_dict (pdf_obj *dict,
+ int (*proc) (pdf_obj *, pdf_obj *, void *), void *pdata)
+{
+ int error = 0;
+ pdf_dict *data;
+
+ ASSERT(proc);
+
+ TYPECHECK(dict, PDF_DICT);
+
+ data = dict->data;
+ while (!error &&
+ data->key != NULL) {
+ error = proc(data->key, data->value, pdata);
+ data = data->next;
+ }
+
+ return error;
+}
+
+#define pdf_match_name(o,s) ((o) && (s) && !strcmp(((pdf_name *)(o)->data)->name, (s)))
+pdf_obj *
+pdf_lookup_dict (pdf_obj *dict, const char *name)
+{
+ pdf_dict *data;
+
+ ASSERT(name);
+
+ TYPECHECK(dict, PDF_DICT);
+
+ data = dict->data;
+ while (data->key != NULL) {
+ if (!strcmp(name, pdf_name_value(data->key))) {
+ return data->value;
+ }
+ data = data->next;
+ }
+
+ return NULL;
+}
+
+/* Returns array of dictionary keys */
+pdf_obj *
+pdf_dict_keys (pdf_obj *dict)
+{
+ pdf_obj *keys;
+ pdf_dict *data;
+
+ TYPECHECK(dict, PDF_DICT);
+
+ keys = pdf_new_array();
+ for (data = dict->data; (data &&
+ data->key != NULL); data = data->next) {
+ /* We duplicate name object rather than linking keys.
+ * If we forget to free keys, broken PDF is generated.
+ */
+ pdf_add_array(keys, pdf_new_name(pdf_name_value(data->key)));
+ }
+
+ return keys;
+}
+
+void
+pdf_remove_dict (pdf_obj *dict, const char *name)
+{
+ pdf_dict *data, **data_p;
+
+ TYPECHECK(dict, PDF_DICT);
+
+ data = dict->data;
+ data_p = (pdf_dict **) (void *) &(dict->data);
+ while (data->key != NULL) {
+ if (pdf_match_name(data->key, name)) {
+ pdf_release_obj(data->key);
+ pdf_release_obj(data->value);
+ *data_p = data->next;
+ RELEASE(data);
+ break;
+ }
+ data_p = &(data->next);
+ data = data->next;
+ }
+}
+
+pdf_obj *
+pdf_new_stream (int flags)
+{
+ pdf_obj *result;
+ pdf_stream *data;
+
+ result = pdf_new_obj(PDF_STREAM);
+ data = NEW(1, pdf_stream);
+ /*
+ * Although we are using an arbitrary pdf_object here, it must have
+ * type=PDF_DICT and cannot be an indirect reference. This will be
+ * checked by the output routine.
+ */
+ data->dict = pdf_new_dict();
+ data->_flags = flags;
+ data->stream = NULL;
+ data->stream_length = 0;
+ data->max_length = 0;
+ data->objstm_data = NULL;
+
+ result->data = data;
+ result->flags |= OBJ_NO_OBJSTM;
+
+ return result;
+}
+
+static void
+write_stream (pdf_stream *stream, FILE *file)
+{
+ unsigned char *filtered;
+ unsigned long filtered_length;
+ unsigned long buffer_length;
+ unsigned char *buffer;
+
+ /*
+ * Always work from a copy of the stream. All filters read from
+ * "filtered" and leave their result in "filtered".
+ */
+#if 0
+ filtered = NEW(stream->stream_length + 1, unsigned char);
+#endif
+ filtered = NEW(stream->stream_length, unsigned char);
+ memcpy(filtered, stream->stream, stream->stream_length);
+ filtered_length = stream->stream_length;
+
+#if 0
+ if (stream->stream_length < 10)
+ stream->_flags &= ^STREAM_COMPRESS;
+#endif
+
+#ifdef HAVE_ZLIB
+ /* Apply compression filter if requested */
+ if (stream->stream_length > 0 &&
+ (stream->_flags & STREAM_COMPRESS) &&
+ compression_level > 0) {
+
+ pdf_obj *filters = pdf_lookup_dict(stream->dict, "Filter");
+
+ buffer_length = filtered_length + filtered_length/1000 + 14;
+ buffer = NEW(buffer_length, unsigned char);
+ {
+ pdf_obj *filter_name = pdf_new_name("FlateDecode");
+
+ if (filters)
+ /*
+ * FlateDecode is the first filter to be applied to the stream.
+ */
+ pdf_unshift_array(filters, filter_name);
+ else
+ /*
+ * Adding the filter as a name instead of a one-element array
+ * is crucial because otherwise Adobe Reader cannot read the
+ * cross-reference stream any more, cf. the PDF v1.5 Errata.
+ */
+ pdf_add_dict(stream->dict, pdf_new_name("Filter"), filter_name);
+ }
+#ifdef HAVE_ZLIB_COMPRESS2
+ if (compress2(buffer, &buffer_length, filtered,
+ filtered_length, compression_level)) {
+ ERROR("Zlib error");
+ }
+#else
+ if (compress(buffer, &buffer_length, filtered,
+ filtered_length)) {
+ ERROR ("Zlib error");
+ }
+#endif /* HAVE_ZLIB_COMPRESS2 */
+ RELEASE(filtered);
+ compression_saved += filtered_length - buffer_length
+ - (filters ? strlen("/FlateDecode "): strlen("/Filter/FlateDecode\n"));
+
+ filtered = buffer;
+ filtered_length = buffer_length;
+ }
+#endif /* HAVE_ZLIB */
+
+#if 0
+ /*
+ * An optional end-of-line marker preceding the "endstream" is
+ * not part of stream data. See, PDF Reference 4th ed., p. 38.
+ */
+ /* Add a '\n' if the last character wasn't one */
+ if (filtered_length > 0 &&
+ filtered[filtered_length-1] != '\n') {
+ filtered[filtered_length] = '\n';
+ filtered_length++;
+ }
+#endif
+ pdf_add_dict(stream->dict,
+ pdf_new_name("Length"), pdf_new_number(filtered_length));
+
+ pdf_write_obj(stream->dict, file);
+
+ pdf_out(file, "\nstream\n", 8);
+
+ if (enc_mode)
+ pdf_encrypt_data(filtered, filtered_length);
+
+ if (filtered_length > 0) {
+ pdf_out(file, filtered, filtered_length);
+ }
+ RELEASE(filtered);
+
+ /*
+ * This stream length "object" gets reset every time write_stream is
+ * called for the stream object.
+ * If this stream gets written more than once with different
+ * filters, this could be a problem.
+ */
+
+ pdf_out(file, "\n", 1);
+ pdf_out(file, "endstream", 9);
+}
+
+static void
+release_stream (pdf_stream *stream)
+{
+ pdf_release_obj(stream->dict);
+ stream->dict = NULL;
+
+ if (stream->stream) {
+ RELEASE(stream->stream);
+ stream->stream = NULL;
+ }
+
+ if (stream->objstm_data) {
+ RELEASE(stream->objstm_data);
+ stream->objstm_data = NULL;
+ }
+
+ RELEASE(stream);
+}
+
+pdf_obj *
+pdf_stream_dict (pdf_obj *stream)
+{
+ pdf_stream *data;
+
+ TYPECHECK(stream, PDF_STREAM);
+
+ data = stream->data;
+
+ return data->dict;
+}
+
+const void *
+pdf_stream_dataptr (pdf_obj *stream)
+{
+ pdf_stream *data;
+
+ TYPECHECK(stream, PDF_STREAM);
+
+ data = stream->data;
+
+ return (const void *) data->stream;
+}
+
+long
+pdf_stream_length (pdf_obj *stream)
+{
+ pdf_stream *data;
+
+ TYPECHECK(stream, PDF_STREAM);
+
+ data = stream->data;
+
+ return (long) data->stream_length;
+}
+
+static void
+set_objstm_data (pdf_obj *objstm, long *data) {
+ TYPECHECK(objstm, PDF_STREAM);
+
+ ((pdf_stream *) objstm->data)->objstm_data = data;
+}
+
+static long *
+get_objstm_data (pdf_obj *objstm) {
+ TYPECHECK(objstm, PDF_STREAM);
+
+ return ((pdf_stream *) objstm->data)->objstm_data;
+}
+
+void
+pdf_add_stream (pdf_obj *stream, const void *stream_data, long length)
+{
+ pdf_stream *data;
+
+ TYPECHECK(stream, PDF_STREAM);
+
+ if (length < 1)
+ return;
+ data = stream->data;
+ if (data->stream_length + length > data->max_length) {
+ data->max_length += length + STREAM_ALLOC_SIZE;
+ data->stream = RENEW(data->stream, data->max_length, unsigned char);
+ }
+ memcpy(data->stream + data->stream_length, stream_data, length);
+ data->stream_length += length;
+}
+
+#if HAVE_ZLIB
+#define WBUF_SIZE 4096
+int
+pdf_add_stream_flate (pdf_obj *dst, const void *data, long len)
+{
+ z_stream z;
+ Bytef wbuf[WBUF_SIZE];
+
+ z.zalloc = Z_NULL; z.zfree = Z_NULL; z.opaque = Z_NULL;
+
+ z.next_in = (Bytef *) data; z.avail_in = len;
+ z.next_out = (Bytef *) wbuf; z.avail_out = WBUF_SIZE;
+
+ if (inflateInit(&z) != Z_OK) {
+ WARN("inflateInit() failed.");
+ return -1;
+ }
+
+ for (;;) {
+ int status;
+ status = inflate(&z, Z_NO_FLUSH);
+ if (status == Z_STREAM_END)
+ break;
+ else if (status != Z_OK) {
+ WARN("inflate() failed. Broken PDF file?");
+ inflateEnd(&z);
+ return -1;
+ }
+
+ if (z.avail_out == 0) {
+ pdf_add_stream(dst, wbuf, WBUF_SIZE);
+ z.next_out = wbuf;
+ z.avail_out = WBUF_SIZE;
+ }
+ }
+
+ if (WBUF_SIZE - z.avail_out > 0)
+ pdf_add_stream(dst, wbuf, WBUF_SIZE - z.avail_out);
+
+ return (inflateEnd(&z) == Z_OK ? 0 : -1);
+}
+#endif
+
+
+int
+pdf_concat_stream (pdf_obj *dst, pdf_obj *src)
+{
+ const char *stream_data;
+ long stream_length;
+ pdf_obj *stream_dict;
+ pdf_obj *filter;
+
+ if (!PDF_OBJ_STREAMTYPE(dst) || !PDF_OBJ_STREAMTYPE(src))
+ ERROR("Invalid type.");
+
+ stream_data = pdf_stream_dataptr(src);
+ stream_length = pdf_stream_length (src);
+ stream_dict = pdf_stream_dict (src);
+
+ if (pdf_lookup_dict(stream_dict, "DecodeParms")) {
+ WARN("Streams with DecodeParams not supported.");
+ return -1;
+ }
+
+ filter = pdf_lookup_dict(stream_dict, "Filter");
+ if (!filter) {
+ pdf_add_stream(dst, stream_data, stream_length);
+ return 0;
+#if HAVE_ZLIB
+ } else {
+ char *filter_name;
+ if (PDF_OBJ_NAMETYPE(filter)) {
+ filter_name = pdf_name_value(filter);
+ if (filter_name && !strcmp(filter_name, "FlateDecode"))
+ return pdf_add_stream_flate(dst, stream_data, stream_length);
+ else {
+ WARN("DecodeFilter \"%s\" not supported.", filter_name);
+ return -1;
+ }
+ } else if (PDF_OBJ_ARRAYTYPE(filter)) {
+ if (pdf_array_length(filter) > 1) {
+ WARN("Multiple DecodeFilter not supported.");
+ return -1;
+ } else {
+ filter_name = pdf_name_value(pdf_get_array(filter, 0));
+ if (filter_name && !strcmp(filter_name, "FlateDecode"))
+ return pdf_add_stream_flate(dst, stream_data, stream_length);
+ else {
+ WARN("DecodeFilter \"%s\" not supported.", filter_name);
+ return -1;
+ }
+ }
+ } else
+ ERROR("Broken PDF file?");
+#endif /* HAVE_ZLIB */
+ }
+
+ return -1;
+}
+
+static pdf_obj *
+pdf_stream_uncompress (pdf_obj *src) {
+ pdf_obj *dst = pdf_new_stream(0);
+
+ TYPECHECK(src, PDF_STREAM);
+
+ pdf_merge_dict(pdf_stream_dict(dst), pdf_stream_dict(src));
+ pdf_remove_dict(pdf_stream_dict(dst), "Length");
+ pdf_concat_stream(dst, src);
+
+ return dst;
+}
+
+#if 0
+void
+pdf_stream_set_flags (pdf_obj *stream, int flags)
+{
+ pdf_stream *data;
+
+ TYPECHECK(stream, PDF_STREAM);
+
+ data = stream->data;
+ data->_flags = flags;
+}
+
+int
+pdf_stream_get_flags (pdf_obj *stream)
+{
+ pdf_stream *data;
+
+ TYPECHECK(stream, PDF_STREAM);
+
+ data = stream->data;
+
+ return data->_flags;
+}
+#endif
+
+static void
+pdf_write_obj (pdf_obj *object, FILE *file)
+{
+ if (object == NULL) {
+ write_null(NULL, file);
+ return;
+ }
+
+ if (INVALIDOBJ(object) || PDF_OBJ_UNDEFINED(object))
+ ERROR("pdf_write_obj: Invalid object, type = %d\n", object->type);
+
+ if (file == stderr)
+ fprintf(stderr, "{%d}", object->refcount);
+
+ switch (object->type) {
+ case PDF_BOOLEAN:
+ write_boolean(object->data, file);
+ break;
+ case PDF_NUMBER:
+ write_number (object->data, file);
+ break;
+ case PDF_STRING:
+ write_string (object->data, file);
+ break;
+ case PDF_NAME:
+ write_name(object->data, file);
+ break;
+ case PDF_ARRAY:
+ write_array(object->data, file);
+ break;
+ case PDF_DICT:
+ write_dict (object->data, file);
+ break;
+ case PDF_STREAM:
+ write_stream(object->data, file);
+ break;
+ case PDF_NULL:
+ write_null(NULL, file);
+ break;
+ case PDF_INDIRECT:
+ write_indirect(object->data, file);
+ break;
+ }
+}
+
+/* Write the object to the file */
+static void
+pdf_flush_obj (pdf_obj *object, FILE *file)
+{
+ long length;
+
+ /*
+ * Record file position
+ */
+ add_xref_entry(object->label, 1,
+ pdf_output_file_position, object->generation);
+ length = sprintf(format_buffer, "%lu %hu obj\n", object->label, object->generation);
+ enc_mode = doc_enc_mode && !(object->flags & OBJ_NO_ENCRYPT);
+ pdf_enc_set_label(object->label);
+ pdf_enc_set_generation(object->generation);
+ pdf_out(file, format_buffer, length);
+ pdf_write_obj(object, file);
+ pdf_out(file, "\nendobj\n", 8);
+}
+
+static long
+pdf_add_objstm (pdf_obj *objstm, pdf_obj *object)
+{
+ long *data, pos;
+
+ TYPECHECK(objstm, PDF_STREAM);
+
+ data = get_objstm_data(objstm);
+ pos = ++data[0];
+
+ data[2*pos] = object->label;
+ data[2*pos+1] = pdf_stream_length(objstm);
+
+ add_xref_entry(object->label, 2, objstm->label, pos-1);
+
+ /* redirect output into objstm */
+ output_stream = objstm;
+ enc_mode = 0;
+ pdf_write_obj(object, pdf_output_file);
+ pdf_out_char(pdf_output_file, '\n');
+ output_stream = NULL;
+
+ return pos;
+}
+
+static void
+release_objstm (pdf_obj *objstm)
+{
+ long *data = get_objstm_data(objstm);
+ long pos = data[0];
+ pdf_obj *dict;
+ pdf_stream *stream;
+ unsigned char *old_buf;
+ unsigned long old_length;
+ stream = (pdf_stream *) objstm->data;
+
+ /* Precede stream data by offset table */
+ old_buf = stream->stream;
+ old_length = stream->stream_length;
+ /* Reserve 22 bytes for each entry (two 10 digit numbers plus two spaces) */
+ stream->stream = NEW(old_length + 22*pos, unsigned char);
+ stream->stream_length = 0;
+
+ {
+ long i = 2*pos, *val = data+2;
+ while (i--) {
+ long length = sprintf(format_buffer, "%ld ", *(val++));
+ pdf_add_stream(objstm, format_buffer, length);
+ }
+ }
+
+ dict = pdf_stream_dict(objstm);
+ pdf_add_dict(dict, pdf_new_name("Type"), pdf_new_name("ObjStm"));
+ pdf_add_dict(dict, pdf_new_name("N"), pdf_new_number(pos));
+ pdf_add_dict(dict, pdf_new_name("First"), pdf_new_number(stream->stream_length));
+
+ pdf_add_stream(objstm, old_buf, old_length);
+ RELEASE(old_buf);
+ pdf_release_obj(objstm);
+}
+
+void
+pdf_release_obj (pdf_obj *object)
+{
+ if (object == NULL)
+ return;
+ if (INVALIDOBJ(object) || object->refcount <= 0) {
+ MESG("\npdf_release_obj: object=%p, type=%d, refcount=%d\n",
+ object, object->type, object->refcount);
+ pdf_write_obj(object, stderr);
+ ERROR("pdf_release_obj: Called with invalid object.");
+ }
+ object->refcount -= 1;
+ if (object->refcount == 0) {
+ /*
+ * Nothing is using this object so it's okay to remove it.
+ * Nonzero "label" means object needs to be written before it's destroyed.
+ */
+ if (object->label && pdf_output_file != NULL) {
+ if (!do_objstm || object->flags & OBJ_NO_OBJSTM
+ || (doc_enc_mode && object->flags & OBJ_NO_ENCRYPT)
+ || object->generation)
+ pdf_flush_obj(object, pdf_output_file);
+ else {
+ if (!current_objstm) {
+ long *data = NEW(2*OBJSTM_MAX_OBJS+2, long);
+ data[0] = data[1] = 0;
+ current_objstm = pdf_new_stream(STREAM_COMPRESS);
+ set_objstm_data(current_objstm, data);
+ pdf_label_obj(current_objstm);
+ }
+ if (pdf_add_objstm(current_objstm, object) == OBJSTM_MAX_OBJS) {
+ release_objstm(current_objstm);
+ current_objstm = NULL;
+ }
+ }
+ }
+ switch (object->type) {
+ case PDF_BOOLEAN:
+ release_boolean(object->data);
+ break;
+ case PDF_NULL:
+ release_null(object->data);
+ break;
+ case PDF_NUMBER:
+ release_number(object->data);
+ break;
+ case PDF_STRING:
+ release_string(object->data);
+ break;
+ case PDF_NAME:
+ release_name(object->data);
+ break;
+ case PDF_ARRAY:
+ release_array(object->data);
+ break;
+ case PDF_DICT:
+ release_dict(object->data);
+ break;
+ case PDF_STREAM:
+ release_stream(object->data);
+ break;
+ case PDF_INDIRECT:
+ release_indirect(object->data);
+ break;
+ }
+ /* This might help detect freeing already freed objects */
+ object->type = -1;
+ object->data = NULL;
+ RELEASE(object);
+ }
+}
+
+#ifdef XETEX
+/* Copy object data without changing object label. */
+void
+pdf_copy_object (pdf_obj *dst, pdf_obj *src)
+{
+ if (!dst || !src)
+ return;
+
+ switch (dst->type) {
+ case PDF_BOOLEAN: release_boolean(dst->data); break;
+ case PDF_NULL: release_null(dst->data); break;
+ case PDF_NUMBER: release_number(dst->data); break;
+ case PDF_STRING: release_string(dst->data); break;
+ case PDF_NAME: release_name(dst->data); break;
+ case PDF_ARRAY: release_array(dst->data); break;
+ case PDF_DICT: release_dict(dst->data); break;
+ case PDF_STREAM: release_stream(dst->data); break;
+ case PDF_INDIRECT: release_indirect(dst->data); break;
+ }
+
+ dst->type = src->type;
+ switch (src->type) {
+ case PDF_BOOLEAN:
+ dst->data = NEW(1, pdf_boolean);
+ pdf_set_boolean(dst, pdf_boolean_value(src));
+ break;
+ case PDF_NULL:
+ dst->data = NULL;
+ break;
+ case PDF_NUMBER:
+ dst->data = NEW(1, pdf_number);
+ pdf_set_number(dst, pdf_number_value(src));
+ break;
+ case PDF_STRING:
+ dst->data = NEW(1, pdf_string);
+ pdf_set_string(dst,
+ pdf_string_value(src),
+ pdf_string_length(src));
+ break;
+ case PDF_NAME:
+ dst->data = NEW(1, pdf_name);
+ pdf_set_name(dst, pdf_name_value(src));
+ break;
+ case PDF_ARRAY:
+ {
+ pdf_array *data;
+ unsigned long i;
+
+ dst->data = data = NEW(1, pdf_array);
+ data->size = 0;
+ data->max = 0;
+ data->values = NULL;
+ for (i = 0; i < pdf_array_length(src); i++) {
+ pdf_add_array(dst, pdf_link_obj(pdf_get_array(src, i)));
+ }
+ }
+ break;
+ case PDF_DICT:
+ {
+ pdf_dict *data;
+
+ dst->data = data = NEW(1, pdf_dict);
+ data->key = NULL;
+ data->value = NULL;
+ data->next = NULL;
+ pdf_merge_dict(dst, src);
+ }
+ break;
+ case PDF_STREAM:
+ {
+ pdf_stream *data;
+
+ dst->data = data = NEW(1, pdf_stream);
+ data->dict = pdf_new_dict();
+ data->_flags = ((pdf_stream *)src->data)->_flags;
+ data->stream_length = 0;
+ data->max_length = 0;
+
+ pdf_add_stream(dst, pdf_stream_dataptr(src), pdf_stream_length(src));
+ pdf_merge_dict(data->dict, pdf_stream_dict(src));
+ }
+ break;
+ case PDF_INDIRECT:
+ {
+ pdf_indirect *data;
+
+ dst->data = data = NEW(1, pdf_indirect);
+ data->pf = ((pdf_indirect *) (src->data))->pf;
+ data->label = ((pdf_indirect *) (src->data))->label;
+ data->generation = ((pdf_indirect *) (src->data))->generation;
+ }
+ break;
+ }
+
+ return;
+}
+#endif
+
+static int
+backup_line (FILE *pdf_input_file)
+{
+ int ch = -1;
+
+ /*
+ * Note: this code should work even if \r\n is eol. It could fail on a
+ * machine where \n is eol and there is a \r in the stream --- Highly
+ * unlikely in the last few bytes where this is likely to be used.
+ */
+ if (tell_position(pdf_input_file) > 1)
+ do {
+ seek_relative (pdf_input_file, -2);
+ } while (tell_position(pdf_input_file) > 0 &&
+ (ch = fgetc(pdf_input_file)) >= 0 &&
+ (ch != '\n' && ch != '\r' ));
+ if (ch < 0) {
+ return 0;
+ }
+
+ return 1;
+}
+
+static long
+find_xref (FILE *pdf_input_file)
+{
+ long xref_pos;
+ int tries = 10;
+
+ do {
+ long currentpos;
+
+ if (!backup_line(pdf_input_file)) {
+ tries = 0;
+ break;
+ }
+ currentpos = tell_position(pdf_input_file);
+ fread(work_buffer, sizeof(char), strlen("startxref"), pdf_input_file);
+ seek_absolute(pdf_input_file, currentpos);
+ tries--;
+ } while (tries > 0 &&
+ strncmp(work_buffer, "startxref", strlen("startxref")));
+ if (tries <= 0)
+ return 0;
+
+ /* Skip rest of this line */
+ mfgets(work_buffer, WORK_BUFFER_SIZE, pdf_input_file);
+ /* Next line of input file should contain actual xref location */
+ mfgets(work_buffer, WORK_BUFFER_SIZE, pdf_input_file);
+
+ {
+ const char *start, *end;
+ char *number;
+
+ start = work_buffer;
+ end = start + strlen(work_buffer);
+ skip_white(&start, end);
+ number = parse_number(&start, end);
+ xref_pos = (long) atof(number);
+ RELEASE(number);
+ }
+
+ return xref_pos;
+}
+
+/*
+ * This routine must be called with the file pointer located
+ * at the start of the trailer.
+ */
+static pdf_obj *
+parse_trailer (pdf_file *pf)
+{
+ pdf_obj *result;
+ /*
+ * Fill work_buffer and hope trailer fits. This should
+ * be made a bit more robust sometime.
+ */
+ if (fread(work_buffer, sizeof(char),
+ WORK_BUFFER_SIZE, pf->file) == 0 ||
+ strncmp(work_buffer, "trailer", strlen("trailer"))) {
+ WARN("No trailer. Are you sure this is a PDF file?");
+ WARN("buffer:\n->%s<-\n", work_buffer);
+ result = NULL;
+ } else {
+ const char *p = work_buffer + strlen("trailer");
+ skip_white(&p, work_buffer + WORK_BUFFER_SIZE);
+ result = parse_pdf_dict(&p, work_buffer + WORK_BUFFER_SIZE, pf);
+ }
+
+ return result;
+}
+
+/*
+ * This routine tries to estimate an upper bound for character position
+ * of the end of the object, so it knows how big the buffer must be.
+ * The parsing routines require that the entire object be read into
+ * memory. It would be a major pain to rewrite them. The worst case
+ * is that an object before an xref table will grab the whole table
+ * :-(
+ */
+static long
+next_object_offset (pdf_file *pf, unsigned long obj_num)
+{
+ long next = pf->file_size; /* Worst case */
+ long i, curr;
+
+ curr = pf->xref_table[obj_num].field2;
+ /* Check all other type 1 objects to find next one */
+ for (i = 0; i < pf->num_obj; i++) {
+ if (pf->xref_table[i].type == 1 &&
+ pf->xref_table[i].field2 > curr &&
+ pf->xref_table[i].field2 < next)
+ next = pf->xref_table[i].field2;
+ }
+
+ return next;
+}
+
+#define checklabel(pf, n, g) ((n) > 0 && (n) < (pf)->num_obj && ( \
+ ((pf)->xref_table[(n)].type == 1 && (pf)->xref_table[(n)].field3 == (g)) || \
+ ((pf)->xref_table[(n)].type == 2 && !(g))))
+
+pdf_obj *
+pdf_new_indirect (pdf_file *pf, unsigned long obj_num, unsigned short obj_gen)
+{
+ pdf_obj *result;
+ pdf_indirect *indirect;
+
+ indirect = NEW(1, pdf_indirect);
+ indirect->pf = pf;
+ indirect->label = obj_num;
+ indirect->generation = obj_gen;
+
+ result = pdf_new_obj(PDF_INDIRECT);
+ result->data = indirect;
+
+ return result;
+}
+
+static pdf_obj *
+pdf_read_object (unsigned long obj_num, unsigned short obj_gen,
+ pdf_file *pf, long offset, long limit)
+{
+ long length;
+ char *buffer;
+ const char *p, *endptr;
+ pdf_obj *result;
+
+ length = limit - offset;
+
+ if (length <= 0)
+ return NULL;
+
+ buffer = NEW(length + 1, char);
+
+ seek_absolute(pf->file, offset);
+ fread(buffer, sizeof(char), length, pf->file);
+
+ p = buffer;
+ endptr = p + length;
+
+ /* Check for obj_num and obj_gen */
+ {
+ const char *q = p; /* <== p */
+ char *sp;
+ unsigned long n, g;
+
+ skip_white(&q, endptr);
+ sp = parse_unsigned(&q, endptr);
+ if (!sp) {
+ RELEASE(buffer);
+ return NULL;
+ }
+ n = strtoul(sp, NULL, 10);
+ RELEASE(sp);
+
+ skip_white(&q, endptr);
+ sp = parse_unsigned(&q, endptr);
+ if (!sp) {
+ RELEASE(buffer);
+ return NULL;
+ }
+ g = strtoul(sp, NULL, 10);
+ RELEASE(sp);
+
+ if (obj_num && (n != obj_num || g != obj_gen)) {
+ RELEASE(buffer);
+ return NULL;
+ }
+
+ p = q; /* ==> p */
+ }
+
+
+ skip_white(&p, endptr);
+ if (memcmp(p, "obj", strlen("obj"))) {
+ WARN("Didn't find \"obj\".");
+ RELEASE(buffer);
+ return NULL;
+ }
+ p += strlen("obj");
+
+ result = parse_pdf_object(&p, endptr, pf);
+
+ skip_white(&p, endptr);
+ if (memcmp(p, "endobj", strlen("endobj"))) {
+ WARN("Didn't find \"endobj\".");
+ if (result)
+ pdf_release_obj(result);
+ result = NULL;
+ }
+ RELEASE(buffer);
+
+ return result;
+}
+
+static pdf_obj *
+read_objstm (pdf_file *pf, unsigned long num)
+{
+ unsigned long offset = pf->xref_table[num].field2;
+ unsigned short gen = pf->xref_table[num].field3;
+ long limit = next_object_offset(pf, num), n, first, *header = NULL;
+ char *data = NULL, *q;
+ const char *p, *endptr;
+ int i;
+
+ pdf_obj *objstm, *dict, *type, *n_obj, *first_obj;
+
+ objstm = pdf_read_object(num, gen, pf, offset, limit);
+
+ if (!PDF_OBJ_STREAMTYPE(objstm))
+ goto error;
+
+ {
+ pdf_obj *tmp = pdf_stream_uncompress(objstm);
+ if (!tmp)
+ goto error;
+ pdf_release_obj(objstm);
+ objstm = tmp;
+ }
+
+ dict = pdf_stream_dict(objstm);
+
+ type = pdf_lookup_dict(dict, "Type");
+ if (!PDF_OBJ_NAMETYPE(type) ||
+ strcmp(pdf_name_value(type), "ObjStm"))
+ goto error;
+
+ n_obj = pdf_lookup_dict(dict, "N");
+ if (!PDF_OBJ_NUMBERTYPE(n_obj))
+ goto error;
+ n = (long) pdf_number_value(n_obj);
+
+ first_obj = pdf_lookup_dict(dict, "First");
+ if (!PDF_OBJ_NUMBERTYPE(first_obj))
+ goto error;
+ first = (long) pdf_number_value(first_obj);
+ /* reject object streams without object data */
+ if (first >= pdf_stream_length(objstm))
+ goto error;
+
+ header = NEW(2*(n+1), long);
+ set_objstm_data(objstm, header);
+ *(header++) = n;
+ *(header++) = first;
+
+ /* avoid parsing beyond offset table */
+ data = NEW(first + 1, char);
+ memcpy(data, pdf_stream_dataptr(objstm), first);
+ data[first] = 0;
+
+ p = data;
+ endptr = p + first;
+ i = 2*n;
+ while (i--) {
+ *(header++) = strtoul(p, &q, 10);
+ if (q == p)
+ goto error;
+ p = q;
+ }
+
+ /* Any garbage after last entry? */
+ skip_white(&p, endptr);
+ if (p != endptr)
+ goto error;
+ RELEASE(data);
+
+ return pf->xref_table[num].direct = objstm;
+
+ error:
+ WARN("Cannot parse object stream.");
+ if (data)
+ RELEASE(data);
+ if (objstm)
+ pdf_release_obj(objstm);
+ return NULL;
+}
+
+/* Label without corresponding object definition are replaced by the
+ * null object, as required by the PDF spec. This is important to parse
+ * several cross-reference sections.
+ */
+static pdf_obj *
+pdf_get_object (pdf_file *pf, unsigned long obj_num, unsigned short obj_gen)
+{
+ pdf_obj *result;
+
+ if (!checklabel(pf, obj_num, obj_gen)) {
+ WARN("Trying to read nonexistent or deleted object: %lu %u",
+ obj_num, obj_gen);
+ return pdf_new_null();
+ }
+
+ if ((result = pf->xref_table[obj_num].direct)) {
+ return pdf_link_obj(result);
+ }
+
+ if (pf->xref_table[obj_num].type == 1) {
+ /* type == 1 */
+ unsigned long offset;
+ long limit;
+ offset = pf->xref_table[obj_num].field2;
+ limit = next_object_offset(pf, obj_num);
+ result = pdf_read_object(obj_num, obj_gen, pf, offset, limit);
+ } else {
+ /* type == 2 */
+ unsigned long objstm_num = pf->xref_table[obj_num].field2;
+ unsigned short index = pf->xref_table[obj_num].field3;
+ pdf_obj *objstm;
+ long *data, n, first, length;
+ const char *p, *q;
+
+ if (objstm_num >= pf->num_obj ||
+ pf->xref_table[objstm_num].type != 1 ||
+ !((objstm = pf->xref_table[objstm_num].direct) ||
+ (objstm = read_objstm(pf, objstm_num))))
+ goto error;
+
+ data = get_objstm_data(objstm);
+ n = *(data++);
+ first = *(data++);
+
+ if (index >= n || data[2*index] != obj_num)
+ goto error;
+
+ length = pdf_stream_length(objstm);
+ p = (const char *) pdf_stream_dataptr(objstm) + first + data[2*index+1];
+ q = p + (index == n-1 ? length : first+data[2*index+3]);
+ result = parse_pdf_object(&p, q, pf);
+ if (!result)
+ goto error;
+ }
+
+ /* Make sure the caller doesn't free this object */
+ pf->xref_table[obj_num].direct = pdf_link_obj(result);
+
+ return result;
+
+ error:
+ WARN("Could not read object from object stream.");
+ return pdf_new_null();
+}
+
+#define OBJ_FILE(o) (((pdf_indirect *)((o)->data))->pf)
+#define OBJ_NUM(o) (((pdf_indirect *)((o)->data))->label)
+#define OBJ_GEN(o) (((pdf_indirect *)((o)->data))->generation)
+
+/* pdf_deref_obj always returns a link instead of the original */
+/* It never return the null object, but the NULL pointer instead */
+pdf_obj *
+pdf_deref_obj (pdf_obj *obj)
+{
+ int count = PDF_OBJ_MAX_DEPTH;
+
+ if (obj)
+ obj = pdf_link_obj(obj);
+
+ while (PDF_OBJ_INDIRECTTYPE(obj) && --count) {
+ pdf_file *pf = OBJ_FILE(obj);
+ unsigned long obj_num = OBJ_NUM(obj);
+ unsigned short obj_gen = OBJ_GEN(obj);
+ if (!pf)
+ ERROR("Tried to deref a non-file object");
+ pdf_release_obj(obj);
+ obj = pdf_get_object(pf, obj_num, obj_gen);
+ }
+
+ if (!count)
+ ERROR("Loop in object hierarchy detected. Broken PDF file?");
+
+ if (PDF_OBJ_NULLTYPE(obj)) {
+ pdf_release_obj(obj);
+ return NULL;
+ } else
+ return obj;
+}
+
+static void
+extend_xref (pdf_file *pf, long new_size)
+{
+ unsigned long i;
+
+ pf->xref_table = RENEW(pf->xref_table, new_size, xref_entry);
+ for (i = pf->num_obj; i < new_size; i++) {
+ pf->xref_table[i].direct = NULL;
+ pf->xref_table[i].indirect = NULL;
+ pf->xref_table[i].type = 0;
+ pf->xref_table[i].field3 = 0;
+ pf->xref_table[i].field2 = 0L;
+ }
+ pf->num_obj = new_size;
+}
+
+static int
+parse_xref_table (pdf_file *pf, long xref_pos)
+{
+ FILE *pdf_input_file = pf->file;
+ unsigned long first, size;
+ unsigned long i, offset;
+ unsigned int obj_gen;
+ char flag;
+ int r;
+
+ /*
+ * This routine reads one xref segment. It may be called multiple times
+ * on the same file. xref tables sometimes come in pieces.
+ */
+
+ seek_absolute(pf->file, xref_pos);
+
+ mfgets(work_buffer, WORK_BUFFER_SIZE, pdf_input_file);
+ if (memcmp(work_buffer, "xref", strlen("xref"))) {
+ /* Might be an xref stream and not an xref table */
+ return 0;
+ }
+ /* Next line in file has first item and size of table */
+ for (;;) {
+ unsigned long current_pos;
+
+ current_pos = tell_position(pdf_input_file);
+ if (mfgets(work_buffer, WORK_BUFFER_SIZE, pdf_input_file) == NULL) {
+ WARN("Premature end of PDF file while parsing xref table.");
+ return -1;
+ }
+ if (!strncmp(work_buffer, "trailer", strlen ("trailer"))) {
+ /*
+ * Backup... This is ugly, but it seems like the safest thing to
+ * do. It is possible the trailer dictionary starts on the same
+ * logical line as the word trailer. In that case, the mfgets
+ * call might have started to read the trailer dictionary and
+ * parse_trailer would fail.
+ */
+ seek_absolute(pdf_input_file, current_pos);
+ break;
+ }
+ sscanf(work_buffer, "%lu %lu", &first, &size);
+ if (pf->num_obj < first + size) {
+ extend_xref(pf, first + size);
+ }
+
+ for (i = first; i < first + size; i++) {
+ fread(work_buffer, sizeof(char), 20, pdf_input_file);
+ /*
+ * Don't overwrite positions that have already been set by a
+ * modified xref table. We are working our way backwards
+ * through the reference table, so we only set "position"
+ * if it hasn't been set yet.
+ */
+ work_buffer[19] = 0;
+ offset = 0UL; obj_gen = 0; flag = 0;
+ r = sscanf(work_buffer, "%010lu %05u %c", &offset, &obj_gen, &flag);
+ if ( r != 3 ||
+ ((flag != 'n' && flag != 'f') ||
+ (flag == 'n' &&
+ (offset >= pf->file_size || (offset > 0 && offset < 4))))) {
+ WARN("Invalid xref table entry [%lu]. PDF file is corrupt...", i);
+ return -1;
+ }
+ if (!pf->xref_table[i].field2) {
+ pf->xref_table[i].type = (flag == 'n');
+ pf->xref_table[i].field2 = offset;
+ pf->xref_table[i].field3 = obj_gen;
+ }
+ }
+ }
+
+ return 1;
+}
+
+static unsigned long
+parse_xrefstm_field (const char **p, int length, unsigned long def)
+{
+ unsigned long val = 0;
+
+ if (!length)
+ return def;
+
+ while (length--) {
+ val <<= 8;
+ val |= (unsigned char) *((*p)++);
+ }
+
+ return val;
+}
+
+static int
+parse_xrefstm_subsec (pdf_file *pf,
+ const char **p, long *length,
+ int *W, int wsum,
+ long first, long size) {
+ xref_entry *e;
+
+ if ((*length -= wsum*size) < 0)
+ return -1;
+
+ if (pf->num_obj < first+size)
+ extend_xref(pf, first+size); /* TODO: change! why? */
+
+ e = pf->xref_table + first;
+ while (size--) {
+ unsigned char type;
+ unsigned long field2;
+ unsigned short field3;
+
+ type = (unsigned char) parse_xrefstm_field(p, W[0], 1);
+ if (type > 2)
+ WARN("Unknown cross-reference stream entry type.");
+ else if (!W[1] || (type != 1 && !W[2]))
+ return -1;
+
+ field2 = (unsigned long) parse_xrefstm_field(p, W[1], 0);
+ field3 = (unsigned short) parse_xrefstm_field(p, W[2], 0);
+
+ if (!e->field2) {
+ e->type = type;
+ e->field2 = field2;
+ e->field3 = field3;
+ }
+ e++;
+ }
+
+ return 0;
+}
+
+static int
+parse_xref_stream (pdf_file *pf, long xref_pos, pdf_obj **trailer)
+{
+ pdf_obj *xrefstm, *size_obj, *W_obj, *index_obj;
+ unsigned long size;
+ long length;
+ int W[3], i, wsum = 0;
+ const char *p;
+
+ xrefstm = pdf_read_object(0, 0, pf, xref_pos, pf->file_size);
+ if (!PDF_OBJ_STREAMTYPE(xrefstm))
+ goto error;
+
+ {
+ pdf_obj *tmp = pdf_stream_uncompress(xrefstm);
+ if (!tmp)
+ goto error;
+ pdf_release_obj(xrefstm);
+ xrefstm = tmp;
+ }
+
+ *trailer = pdf_link_obj(pdf_stream_dict(xrefstm));
+
+ size_obj = pdf_lookup_dict(*trailer, "Size");
+ if (!PDF_OBJ_NUMBERTYPE(size_obj))
+ goto error;
+ size = (unsigned long) pdf_number_value(size_obj);
+
+ length = pdf_stream_length(xrefstm);
+
+ W_obj = pdf_lookup_dict(*trailer, "W");
+ if (!PDF_OBJ_ARRAYTYPE(W_obj) || pdf_array_length(W_obj) != 3)
+ goto error;
+
+ for (i = 0; i < 3; i++) {
+ pdf_obj *tmp = pdf_get_array(W_obj, i);
+ if (!PDF_OBJ_NUMBERTYPE(tmp))
+ goto error;
+ wsum += (W[i] = (int) pdf_number_value(tmp));
+ }
+
+ p = pdf_stream_dataptr(xrefstm);
+
+ index_obj = pdf_lookup_dict(*trailer, "Index");
+ if (index_obj) {
+ unsigned int index_len;
+ if (!PDF_OBJ_ARRAYTYPE(index_obj) ||
+ ((index_len = pdf_array_length(index_obj)) % 2 ))
+ goto error;
+
+ i = 0;
+ while (i < index_len) {
+ pdf_obj *first = pdf_get_array(index_obj, i++);
+ size_obj = pdf_get_array(index_obj, i++);
+ if (!PDF_OBJ_NUMBERTYPE(first) ||
+ !PDF_OBJ_NUMBERTYPE(size_obj) ||
+ parse_xrefstm_subsec(pf, &p, &length, W, wsum,
+ (long) pdf_number_value(first),
+ (long) pdf_number_value(size_obj)))
+ goto error;
+ }
+ } else if (parse_xrefstm_subsec(pf, &p, &length, W, wsum, 0, size))
+ goto error;
+
+ if (length)
+ WARN("Garbage in xref stream.");
+
+ pdf_release_obj(xrefstm);
+
+ return 1;
+
+ error:
+ WARN("Cannot parse cross-reference stream.");
+ if (xrefstm)
+ pdf_release_obj(xrefstm);
+ if (*trailer) {
+ pdf_release_obj(*trailer);
+ *trailer = NULL;
+ }
+ return 0;
+}
+
+/* TODO: parse Version entry */
+static pdf_obj *
+read_xref (pdf_file *pf)
+{
+ pdf_obj *trailer = NULL, *main_trailer = NULL;
+ long xref_pos;
+
+ if (!(xref_pos = find_xref(pf->file)))
+ goto error;
+
+ while (xref_pos) {
+ pdf_obj *prev;
+
+ int res = parse_xref_table(pf, xref_pos);
+ if (res > 0) {
+ /* cross-reference table */
+ pdf_obj *xrefstm;
+
+ if (!(trailer = parse_trailer(pf)))
+ goto error;
+
+ if (!main_trailer)
+ main_trailer = pdf_link_obj(trailer);
+
+ if ((xrefstm = pdf_lookup_dict(trailer, "XRefStm"))) {
+ pdf_obj *new_trailer = NULL;
+ if (PDF_OBJ_NUMBERTYPE(xrefstm) &&
+ parse_xref_stream(pf, (long) pdf_number_value(xrefstm),
+ &new_trailer))
+ pdf_release_obj(new_trailer);
+ else
+ WARN("Skipping hybrid reference section.");
+ /* Many PDF 1.5 xref streams use DecodeParms, which we cannot
+ parse. This way we can use at least xref tables in hybrid
+ documents. Or should we better stop parsing the file?
+ */
+ }
+
+ } else if (!res && parse_xref_stream(pf, xref_pos, &trailer)) {
+ /* cross-reference stream */
+ if (!main_trailer)
+ main_trailer = pdf_link_obj(trailer);
+ } else
+ goto error;
+
+ if ((prev = pdf_lookup_dict(trailer, "Prev"))) {
+ if (PDF_OBJ_NUMBERTYPE(prev))
+ xref_pos = (long) pdf_number_value(prev);
+ else
+ goto error;
+ } else
+ xref_pos = 0;
+
+ pdf_release_obj(trailer);
+ }
+
+#if 0
+ if (!pdf_lookup_dict(main_trailer, "Root")) {
+ WARN("Trailer doesn't have catalog. Is this a correct PDF file?");
+ goto error;
+ }
+#endif
+
+ return main_trailer;
+
+ error:
+ WARN("Error while parsing PDF file.");
+ if (trailer)
+ pdf_release_obj(trailer);
+ if (main_trailer)
+ pdf_release_obj(main_trailer);
+ return NULL;
+}
+
+static struct ht_table *pdf_files = NULL;
+
+static pdf_file *
+pdf_file_new (FILE *file)
+{
+ pdf_file *pf;
+ ASSERT(file);
+ pf = NEW(1, pdf_file);
+ pf->file = file;
+ pf->trailer = NULL;
+ pf->xref_table = NULL;
+ pf->catalog = NULL;
+ pf->num_obj = 0;
+ pf->version = 0;
+
+ seek_end(file);
+ pf->file_size = tell_position(file);
+
+ return pf;
+}
+
+static void
+pdf_file_free (pdf_file *pf)
+{
+ unsigned long i;
+
+ if (!pf) {
+ return;
+ }
+
+ for (i = 0; i < pf->num_obj; i++) {
+ if (pf->xref_table[i].direct)
+ pdf_release_obj(pf->xref_table[i].direct);
+ if (pf->xref_table[i].indirect)
+ pdf_release_obj(pf->xref_table[i].indirect);
+ }
+
+ RELEASE(pf->xref_table);
+ if (pf->trailer)
+ pdf_release_obj(pf->trailer);
+ if (pf->catalog)
+ pdf_release_obj(pf->catalog);
+
+ RELEASE(pf);
+}
+
+void
+pdf_files_init (void)
+{
+ pdf_files = NEW(1, struct ht_table);
+ ht_init_table(pdf_files, (void (*)(void *)) pdf_file_free);
+}
+
+int
+pdf_file_get_version (pdf_file *pf)
+{
+ ASSERT(pf);
+ return pf->version;
+}
+
+#ifdef XETEX
+pdf_obj *
+pdf_file_get_trailer (pdf_file *pf)
+{
+ ASSERT(pf);
+ return pdf_link_obj(pf->trailer);
+}
+#endif
+
+pdf_obj *
+pdf_file_get_catalog (pdf_file *pf)
+{
+ ASSERT(pf);
+ return pf->catalog;
+}
+
+pdf_file *
+pdf_open (const char *ident, FILE *file)
+{
+ pdf_file *pf = NULL;
+
+ ASSERT(pdf_files);
+
+ if (ident)
+ pf = (pdf_file *) ht_lookup_table(pdf_files, ident, strlen(ident));
+
+ if (pf) {
+ pf->file = file;
+ } else {
+#ifndef XETEX
+ pdf_obj *new_version;
+#endif
+ int version = check_for_pdf_version(file);
+
+ if (version < 1 || version > pdf_version) {
+ WARN("pdf_open: Not a PDF 1.[1-%u] file.", pdf_version);
+ return NULL;
+ }
+
+ pf = pdf_file_new(file);
+ pf->version = version;
+
+ if (!(pf->trailer = read_xref(pf)))
+ goto error;
+
+#ifndef XETEX
+ if (pdf_lookup_dict(pf->trailer, "Encrypt")) {
+ WARN("PDF document is encrypted.");
+ goto error;
+ }
+
+ pf->catalog = pdf_deref_obj(pdf_lookup_dict(pf->trailer, "Root"));
+ if (!PDF_OBJ_DICTTYPE(pf->catalog)) {
+ WARN("Cannot read PDF document catalog. Broken PDF file?");
+ goto error;
+ }
+
+ new_version = pdf_deref_obj(pdf_lookup_dict(pf->catalog, "Version"));
+ if (new_version) {
+ unsigned int minor;
+
+ if (!PDF_OBJ_NAMETYPE(new_version) ||
+ sscanf(pdf_name_value(new_version), "1.%u", &minor) != 1) {
+ pdf_release_obj(new_version);
+ WARN("Illegal Version entry in document catalog. Broken PDF file?");
+ goto error;
+ }
+
+ if (pf->version < minor)
+ pf->version = minor;
+
+ pdf_release_obj(new_version);
+ }
+#endif
+
+ if (ident)
+ ht_append_table(pdf_files, ident, strlen(ident), pf);
+ }
+
+ return pf;
+
+ error:
+ pdf_file_free(pf);
+ return NULL;
+}
+
+void
+pdf_close (pdf_file *pf)
+{
+ if (pf)
+ pf->file = NULL;
+}
+
+void
+pdf_files_close (void)
+{
+ ASSERT(pdf_files);
+ ht_clear_table(pdf_files);
+ RELEASE(pdf_files);
+}
+
+static int
+check_for_pdf_version (FILE *file)
+{
+ unsigned int minor;
+
+ rewind(file);
+
+ return (ungetc(fgetc(file), file) == '%' &&
+ fscanf(file, "%%PDF-1.%u", &minor) == 1) ? minor : -1;
+}
+
+int
+check_for_pdf (FILE *file)
+{
+ int version = check_for_pdf_version(file);
+
+ if (version < 0) /* not a PDF file */
+ return 0;
+
+ if (version <= pdf_version)
+ return 1;
+
+ WARN("Version of PDF file (1.%c) is newer than version limit specification.",
+ pdf_version);
+ return 0;
+}
+
+static int CDECL
+import_dict (pdf_obj *key, pdf_obj *value, void *pdata)
+{
+ pdf_obj *copy;
+ pdf_obj *tmp;
+
+ copy = (pdf_obj *) pdata;
+
+ tmp = pdf_import_object(value);
+ if (!tmp) {
+ return -1;
+ }
+ pdf_add_dict(copy, pdf_link_obj(key), tmp);
+
+ return 0;
+}
+
+static pdf_obj loop_marker = { PDF_OBJ_INVALID, 0, 0, 0, 0, NULL };
+
+static pdf_obj *
+pdf_import_indirect (pdf_obj *object)
+{
+ pdf_file *pf = OBJ_FILE(object);
+ unsigned long obj_num = OBJ_NUM(object);
+ unsigned short obj_gen = OBJ_GEN(object);
+
+ pdf_obj *ref;
+
+ ASSERT(pf);
+
+ if (!checklabel(pf, obj_num, obj_gen)) {
+ WARN("Can't resolve object: %lu %u", obj_num, obj_gen);
+ return pdf_new_null();
+ }
+
+ if ((ref = pf->xref_table[obj_num].indirect)) {
+ if (ref == &loop_marker)
+ ERROR("Loop in object hierarchy detected. Broken PDF file?");
+ return pdf_link_obj(ref);
+ } else {
+ pdf_obj *obj, *tmp;
+
+ obj = pdf_get_object(pf, obj_num, obj_gen);
+ if (!obj) {
+ WARN("Could not read object: %lu %u", obj_num, obj_gen);
+ return NULL;
+ }
+
+ /* We mark the reference to be able to detect loops */
+ pf->xref_table[obj_num].indirect = &loop_marker;
+
+ tmp = pdf_import_object(obj);
+
+ pf->xref_table[obj_num].indirect = ref = pdf_ref_obj(tmp);
+
+ pdf_release_obj(tmp);
+ pdf_release_obj(obj);
+
+ return pdf_link_obj(ref);
+ }
+}
+
+/*
+ * pdf_import_object recursively copies the object and those
+ * referenced by it and changes the indirect references so that
+ * they refer to the current output file. New indirect references
+ * are remembered, which avoids duplicating objects when they
+ * are imported several times.
+ */
+pdf_obj *
+pdf_import_object (pdf_obj *object)
+{
+ pdf_obj *imported;
+ pdf_obj *tmp;
+ int i;
+
+ switch (pdf_obj_typeof(object)) {
+
+ case PDF_INDIRECT:
+ if (OBJ_FILE(object)) {
+ imported = pdf_import_indirect(object);
+ } else {
+ imported = pdf_link_obj(object);
+ }
+ break;
+
+ case PDF_STREAM:
+ {
+ pdf_obj *stream_dict;
+
+ tmp = pdf_import_object(pdf_stream_dict(object));
+ if (!tmp)
+ return NULL;
+
+ imported = pdf_new_stream(0);
+ stream_dict = pdf_stream_dict(imported);
+ pdf_merge_dict(stream_dict, tmp);
+ pdf_release_obj(tmp);
+ pdf_add_stream(imported,
+ pdf_stream_dataptr(object),
+ pdf_stream_length(object));
+ }
+ break;
+
+ case PDF_DICT:
+
+ imported = pdf_new_dict();
+ if (pdf_foreach_dict(object, import_dict, imported) < 0) {
+ pdf_release_obj(imported);
+ return NULL;
+ }
+
+ break;
+
+ case PDF_ARRAY:
+
+ imported = pdf_new_array();
+ for (i = 0; i < pdf_array_length(object); i++) {
+ tmp = pdf_import_object(pdf_get_array(object, i));
+ if (!tmp) {
+ pdf_release_obj(imported);
+ return NULL;
+ }
+ pdf_add_array(imported, tmp);
+ }
+ break;
+
+ default:
+ imported = pdf_link_obj(object);
+ }
+
+ return imported;
+}
+
+
+/* returns 0 if indirect references point to the same object */
+int
+pdf_compare_reference (pdf_obj *ref1, pdf_obj *ref2)
+{
+ pdf_indirect *data1, *data2;
+
+ ASSERT(PDF_OBJ_INDIRECTTYPE(ref1) && PDF_OBJ_INDIRECTTYPE(ref2));
+
+ data1 = (pdf_indirect *) ref1->data;
+ data2 = (pdf_indirect *) ref2->data;
+
+ return data1->pf != data2->pf || data1->label != data2->label
+ || data1->generation != data2->generation;
+}