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/******************************************************************************
* pdf.h
*
* pdfresurrect - PDF history extraction tool
*
* See https://github.com/enferex/pdfresurrect/blob/master/LICENSE for license
* information.
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*****************************************************************************/
#ifndef PDF_H_INCLUDE
#define PDF_H_INCLUDE
#include <stdio.h>
/* 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 */
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