mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-12-26 05:18:21 +01:00
a431d7806f
the Radboud University NL (thanks!) - Add depth argument to all value read functions that recurse - Add depth argument to page tree loading code - Validate xref stream sizes individually to avoid out-of-bounds access to local xref buffer.
1942 lines
50 KiB
C
1942 lines
50 KiB
C
//
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// PDF file functions for PDFio.
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//
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// Copyright © 2021 by Michael R Sweet.
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//
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// Licensed under Apache License v2.0. See the file "LICENSE" for more
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// information.
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//
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//
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// Include necessary headers...
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//
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#include "pdfio-private.h"
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#ifndef O_BINARY
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# define O_BINARY 0
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#endif // !O_BINARY
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//
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// Local functions...
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//
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static pdfio_obj_t *add_obj(pdfio_file_t *pdf, size_t number, unsigned short generation, off_t offset);
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static int compare_objmaps(_pdfio_objmap_t *a, _pdfio_objmap_t *b);
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static int compare_objs(pdfio_obj_t **a, pdfio_obj_t **b);
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static bool load_obj_stream(pdfio_obj_t *obj);
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static bool load_pages(pdfio_file_t *pdf, pdfio_obj_t *obj, size_t depth);
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static bool load_xref(pdfio_file_t *pdf, off_t xref_offset, pdfio_password_cb_t password_cb, void *password_data);
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static bool write_catalog(pdfio_file_t *pdf);
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static bool write_pages(pdfio_file_t *pdf);
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static bool write_trailer(pdfio_file_t *pdf);
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//
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// '_pdfioFileAddMappedObj()' - Add a mapped object.
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//
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bool // O - `true` on success, `false` on failure
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_pdfioFileAddMappedObj(
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pdfio_file_t *pdf, // I - Destination PDF file
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pdfio_obj_t *dst_obj, // I - Destination object
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pdfio_obj_t *src_obj) // I - Source object
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{
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_pdfio_objmap_t *map; // Object map
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// Allocate memory as needed...
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if (pdf->num_objmaps >= pdf->alloc_objmaps)
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{
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if ((map = realloc(pdf->objmaps, (pdf->alloc_objmaps + 16) * sizeof(_pdfio_objmap_t))) == NULL)
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{
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_pdfioFileError(pdf, "Unable to allocate memory for object map.");
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return (false);
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}
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pdf->alloc_objmaps += 16;
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pdf->objmaps = map;
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}
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// Add an object to the end...
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map = pdf->objmaps + pdf->num_objmaps;
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pdf->num_objmaps ++;
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map->obj = dst_obj;
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map->src_pdf = src_obj->pdf;
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map->src_number = src_obj->number;
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// Sort as needed...
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if (pdf->num_objmaps > 1 && compare_objmaps(map, pdf->objmaps + pdf->num_objmaps - 2) < 0)
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qsort(pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps);
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return (true);
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}
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//
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// '_pdfioFileAddPage()' - Add a page to a PDF file.
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//
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bool // O - `true` on success and `false` on failure
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_pdfioFileAddPage(pdfio_file_t *pdf, // I - PDF file
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pdfio_obj_t *obj) // I - Page object
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{
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// Add the page to the array of pages...
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if (pdf->num_pages >= pdf->alloc_pages)
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{
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pdfio_obj_t **temp = (pdfio_obj_t **)realloc(pdf->pages, (pdf->alloc_pages + 16) * sizeof(pdfio_obj_t *));
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if (!temp)
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{
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_pdfioFileError(pdf, "Unable to allocate memory for pages.");
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return (false);
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}
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pdf->alloc_pages += 16;
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pdf->pages = temp;
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}
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pdf->pages[pdf->num_pages ++] = obj;
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return (true);
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}
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//
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// 'pdfioFileClose()' - Close a PDF file and free all memory used for it.
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//
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bool // O - `true` on success and `false` on failure
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pdfioFileClose(pdfio_file_t *pdf) // I - PDF file
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{
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bool ret = true; // Return value
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size_t i; // Looping var
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// Range check input
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if (!pdf)
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return (false);
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// Close the file itself...
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if (pdf->mode == _PDFIO_MODE_WRITE)
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{
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ret = false;
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if (pdfioObjClose(pdf->info_obj))
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if (write_pages(pdf))
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if (write_catalog(pdf))
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if (write_trailer(pdf))
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ret = _pdfioFileFlush(pdf);
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}
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if (pdf->fd >= 0 && close(pdf->fd) < 0)
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ret = false;
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// Free all data...
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free(pdf->filename);
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free(pdf->version);
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for (i = 0; i < pdf->num_arrays; i ++)
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_pdfioArrayDelete(pdf->arrays[i]);
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free(pdf->arrays);
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for (i = 0; i < pdf->num_dicts; i ++)
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_pdfioDictDelete(pdf->dicts[i]);
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free(pdf->dicts);
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for (i = 0; i < pdf->num_objs; i ++)
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_pdfioObjDelete(pdf->objs[i]);
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free(pdf->objs);
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free(pdf->objmaps);
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free(pdf->pages);
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for (i = 0; i < pdf->num_strings; i ++)
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free(pdf->strings[i]);
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free(pdf->strings);
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free(pdf);
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return (ret);
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}
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//
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// 'pdfioFileCreate()' - Create a PDF file.
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//
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// This function creates a new PDF file. The "filename" argument specifies the
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// name of the PDF file to create.
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//
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// The "version" argument specifies the PDF version number for the file or
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// `NULL` for the default ("2.0").
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//
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// The "media_box" and "crop_box" arguments specify the default MediaBox and
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// CropBox for pages in the PDF file - if `NULL` then a default "Universal" size
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// of 8.27x11in (the intersection of US Letter and ISO A4) is used.
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//
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// The "error_cb" and "error_data" arguments specify an error handler callback
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// and its data pointer - if `NULL` the default error handler is used that
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// writes error messages to `stderr`.
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//
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pdfio_file_t * // O - PDF file or `NULL` on error
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pdfioFileCreate(
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const char *filename, // I - Filename
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const char *version, // I - PDF version number or `NULL` for default (2.0)
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pdfio_rect_t *media_box, // I - Default MediaBox for pages
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pdfio_rect_t *crop_box, // I - Default CropBox for pages
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pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
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void *error_data) // I - Error callback data, if any
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{
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pdfio_file_t *pdf; // PDF file
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pdfio_dict_t *dict; // Dictionary for pages object
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pdfio_dict_t *info_dict; // Dictionary for information object
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unsigned char id_value[16]; // File ID value
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// Range check input...
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if (!filename)
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return (NULL);
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if (!version)
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version = "2.0";
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if (!error_cb)
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{
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error_cb = _pdfioFileDefaultError;
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error_data = NULL;
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}
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// Allocate a PDF file structure...
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if ((pdf = (pdfio_file_t *)calloc(1, sizeof(pdfio_file_t))) == NULL)
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{
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pdfio_file_t temp; // Dummy file
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char message[8192]; // Message string
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temp.filename = (char *)filename;
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snprintf(message, sizeof(message), "Unable to allocate memory for PDF file - %s", strerror(errno));
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(error_cb)(&temp, message, error_data);
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return (NULL);
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}
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pdf->filename = strdup(filename);
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pdf->version = strdup(version);
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pdf->mode = _PDFIO_MODE_WRITE;
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pdf->error_cb = error_cb;
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pdf->error_data = error_data;
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pdf->permissions = PDFIO_PERMISSION_ALL;
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pdf->bufptr = pdf->buffer;
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pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
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if (media_box)
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{
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pdf->media_box = *media_box;
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}
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else
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{
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// Default to "universal" size (intersection of A4 and US Letter)
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pdf->media_box.x2 = 210.0 * 72.0f / 25.4f;
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pdf->media_box.y2 = 11.0f * 72.0f;
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}
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if (crop_box)
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{
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pdf->crop_box = *crop_box;
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}
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else
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{
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// Default to "universal" size (intersection of A4 and US Letter)
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pdf->crop_box.x2 = 210.0 * 72.0f / 25.4f;
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pdf->crop_box.y2 = 11.0f * 72.0f;
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}
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// Create the file...
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if ((pdf->fd = open(filename, O_WRONLY | O_BINARY | O_CREAT | O_TRUNC, 0666)) < 0)
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{
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_pdfioFileError(pdf, "Unable to create file - %s", strerror(errno));
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free(pdf->filename);
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free(pdf->version);
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free(pdf);
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return (NULL);
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}
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// Write a standard PDF header...
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if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
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{
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pdfioFileClose(pdf);
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unlink(filename);
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return (NULL);
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}
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// Create the pages object...
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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{
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pdfioFileClose(pdf);
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unlink(filename);
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return (NULL);
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}
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pdfioDictSetName(dict, "Type", "Pages");
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if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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{
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pdfioFileClose(pdf);
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unlink(filename);
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return (NULL);
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}
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// Create the info object...
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if ((info_dict = pdfioDictCreate(pdf)) == NULL)
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{
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pdfioFileClose(pdf);
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unlink(filename);
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return (NULL);
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}
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pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
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pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
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if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
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{
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pdfioFileClose(pdf);
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unlink(filename);
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return (NULL);
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}
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// Create random file ID values...
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_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
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if ((pdf->id_array = pdfioArrayCreate(pdf)) != NULL)
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{
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pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
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pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
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}
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return (pdf);
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}
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//
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// 'pdfioFileCreateArrayObj()' - Create a new object in a PDF file containing an array.
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//
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// This function creates a new object with an array value in a PDF file.
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// You must call @link pdfioObjClose@ to write the object to the file.
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//
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pdfio_obj_t * // O - New object
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pdfioFileCreateArrayObj(
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pdfio_file_t *pdf, // I - PDF file
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pdfio_array_t *array) // I - Object array
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{
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_pdfio_value_t value; // Object value
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// Range check input...
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if (!pdf || !array)
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return (NULL);
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value.type = PDFIO_VALTYPE_ARRAY;
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value.value.array = array;
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return (_pdfioFileCreateObj(pdf, array->pdf, &value));
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}
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//
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// 'pdfioFileCreateObj()' - Create a new object in a PDF file.
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//
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pdfio_obj_t * // O - New object
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pdfioFileCreateObj(
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pdfio_file_t *pdf, // I - PDF file
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pdfio_dict_t *dict) // I - Object dictionary
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{
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_pdfio_value_t value; // Object value
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// Range check input...
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if (!pdf || !dict)
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return (NULL);
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value.type = PDFIO_VALTYPE_DICT;
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value.value.dict = dict;
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return (_pdfioFileCreateObj(pdf, dict->pdf, &value));
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}
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//
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// '_pdfioFileCreateObj()' - Create a new object in a PDF file with a value.
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//
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pdfio_obj_t * // O - New object
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_pdfioFileCreateObj(
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pdfio_file_t *pdf, // I - PDF file
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pdfio_file_t *srcpdf, // I - Source PDF file, if any
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_pdfio_value_t *value) // I - Object dictionary
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{
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pdfio_obj_t *obj; // New object
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// Range check input...
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if (!pdf)
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return (NULL);
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if (pdf->mode != _PDFIO_MODE_WRITE)
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return (NULL);
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// Allocate memory for the object...
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if ((obj = (pdfio_obj_t *)calloc(1, sizeof(pdfio_obj_t))) == NULL)
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{
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_pdfioFileError(pdf, "Unable to allocate memory for object - %s", strerror(errno));
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return (NULL);
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}
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// Expand the objects array as needed
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if (pdf->num_objs >= pdf->alloc_objs)
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{
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pdfio_obj_t **temp = (pdfio_obj_t **)realloc(pdf->objs, (pdf->alloc_objs + 32) * sizeof(pdfio_obj_t *));
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if (!temp)
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{
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_pdfioFileError(pdf, "Unable to allocate memory for object - %s", strerror(errno));
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free(obj);
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return (NULL);
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}
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pdf->objs = temp;
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pdf->alloc_objs += 32;
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}
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pdf->objs[pdf->num_objs ++] = obj;
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// Initialize the object...
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obj->pdf = pdf;
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obj->number = pdf->num_objs;
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if (value)
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_pdfioValueCopy(pdf, &obj->value, srcpdf, value);
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// Don't write anything just yet...
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return (obj);
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}
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//
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// 'pdfioFileCreateOutput()' - Create a PDF file through an output callback.
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//
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// This function creates a new PDF file that is streamed though an output
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// callback. The "output_cb" and "output_ctx" arguments specify the output
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// callback and its context pointer which is called whenever data needs to be
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// written:
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//
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// ```
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// ssize_t
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// output_cb(void *output_ctx, const void *buffer, size_t bytes)
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// {
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// // Write buffer to output and return the number of bytes written
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// }
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// ```
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//
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// The "version" argument specifies the PDF version number for the file or
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// `NULL` for the default ("2.0").
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//
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// The "media_box" and "crop_box" arguments specify the default MediaBox and
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// CropBox for pages in the PDF file - if `NULL` then a default "Universal" size
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// of 8.27x11in (the intersection of US Letter and ISO A4) is used.
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//
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// The "error_cb" and "error_data" arguments specify an error handler callback
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// and its data pointer - if `NULL` the default error handler is used that
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// writes error messages to `stderr`.
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//
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// > *Note*: Files created using this API are slightly larger than those
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// > created using the @link pdfioFileCreate@ function since stream lengths are
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// > stored as indirect object references.
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//
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pdfio_file_t * // O - PDF file or `NULL` on error
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pdfioFileCreateOutput(
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pdfio_output_cb_t output_cb, // I - Output callback
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void *output_ctx, // I - Output context
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const char *version, // I - PDF version number or `NULL` for default (2.0)
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pdfio_rect_t *media_box, // I - Default MediaBox for pages
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pdfio_rect_t *crop_box, // I - Default CropBox for pages
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pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
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void *error_data) // I - Error callback data, if any
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{
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pdfio_file_t *pdf; // PDF file
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pdfio_dict_t *dict; // Dictionary for pages object
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pdfio_dict_t *info_dict; // Dictionary for information object
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unsigned char id_value[16]; // File ID value
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// Range check input...
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if (!output_cb)
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return (NULL);
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if (!version)
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version = "2.0";
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if (!error_cb)
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{
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error_cb = _pdfioFileDefaultError;
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error_data = NULL;
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}
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// Allocate a PDF file structure...
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if ((pdf = (pdfio_file_t *)calloc(1, sizeof(pdfio_file_t))) == NULL)
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{
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pdfio_file_t temp; // Dummy file
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char message[8192]; // Message string
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temp.filename = (char *)"output.pdf";
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snprintf(message, sizeof(message), "Unable to allocate memory for PDF file - %s", strerror(errno));
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(error_cb)(&temp, message, error_data);
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return (NULL);
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}
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pdf->filename = strdup("output.pdf");
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pdf->version = strdup(version);
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pdf->mode = _PDFIO_MODE_WRITE;
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pdf->error_cb = error_cb;
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pdf->error_data = error_data;
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pdf->permissions = PDFIO_PERMISSION_ALL;
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pdf->bufptr = pdf->buffer;
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pdf->bufend = pdf->buffer + sizeof(pdf->buffer);
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if (media_box)
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{
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pdf->media_box = *media_box;
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}
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else
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{
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// Default to "universal" size (intersection of A4 and US Letter)
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pdf->media_box.x2 = 210.0 * 72.0f / 25.4f;
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pdf->media_box.y2 = 11.0f * 72.0f;
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}
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if (crop_box)
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{
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pdf->crop_box = *crop_box;
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}
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else
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{
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||
// Default to "universal" size (intersection of A4 and US Letter)
|
||
pdf->crop_box.x2 = 210.0 * 72.0f / 25.4f;
|
||
pdf->crop_box.y2 = 11.0f * 72.0f;
|
||
}
|
||
|
||
// Save output callback...
|
||
pdf->fd = -1;
|
||
pdf->output_cb = output_cb;
|
||
pdf->output_ctx = output_ctx;
|
||
|
||
// Write a standard PDF header...
|
||
if (!_pdfioFilePrintf(pdf, "%%PDF-%s\n%%\342\343\317\323\n", version))
|
||
{
|
||
pdfioFileClose(pdf);
|
||
return (NULL);
|
||
}
|
||
|
||
// Create the pages object...
|
||
if ((dict = pdfioDictCreate(pdf)) == NULL)
|
||
{
|
||
pdfioFileClose(pdf);
|
||
return (NULL);
|
||
}
|
||
|
||
pdfioDictSetName(dict, "Type", "Pages");
|
||
|
||
if ((pdf->pages_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||
{
|
||
pdfioFileClose(pdf);
|
||
return (NULL);
|
||
}
|
||
|
||
// Create the info object...
|
||
if ((info_dict = pdfioDictCreate(pdf)) == NULL)
|
||
{
|
||
pdfioFileClose(pdf);
|
||
return (NULL);
|
||
}
|
||
|
||
pdfioDictSetDate(info_dict, "CreationDate", time(NULL));
|
||
pdfioDictSetString(info_dict, "Producer", "pdfio/" PDFIO_VERSION);
|
||
|
||
if ((pdf->info_obj = pdfioFileCreateObj(pdf, info_dict)) == NULL)
|
||
{
|
||
pdfioFileClose(pdf);
|
||
return (NULL);
|
||
}
|
||
|
||
// Create random file ID values...
|
||
_pdfioCryptoMakeRandom(id_value, sizeof(id_value));
|
||
|
||
if ((pdf->id_array = pdfioArrayCreate(pdf)) != NULL)
|
||
{
|
||
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
|
||
pdfioArrayAppendBinary(pdf->id_array, id_value, sizeof(id_value));
|
||
}
|
||
|
||
return (pdf);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileCreatePage()' - Create a page in a PDF file.
|
||
//
|
||
|
||
pdfio_stream_t * // O - Contents stream
|
||
pdfioFileCreatePage(pdfio_file_t *pdf, // I - PDF file
|
||
pdfio_dict_t *dict) // I - Page dictionary
|
||
{
|
||
pdfio_obj_t *page, // Page object
|
||
*contents; // Contents object
|
||
pdfio_dict_t *contents_dict; // Dictionary for Contents object
|
||
|
||
|
||
// Range check input...
|
||
if (!pdf)
|
||
return (NULL);
|
||
|
||
// Copy the page dictionary...
|
||
if (dict)
|
||
dict = pdfioDictCopy(pdf, dict);
|
||
else
|
||
dict = pdfioDictCreate(pdf);
|
||
|
||
if (!dict)
|
||
return (NULL);
|
||
|
||
// Make sure the page dictionary has all of the required keys...
|
||
if (!_pdfioDictGetValue(dict, "CropBox"))
|
||
pdfioDictSetRect(dict, "CropBox", &pdf->crop_box);
|
||
|
||
if (!_pdfioDictGetValue(dict, "MediaBox"))
|
||
pdfioDictSetRect(dict, "MediaBox", &pdf->media_box);
|
||
|
||
pdfioDictSetObj(dict, "Parent", pdf->pages_obj);
|
||
|
||
if (!_pdfioDictGetValue(dict, "Resources"))
|
||
pdfioDictSetDict(dict, "Resources", pdfioDictCreate(pdf));
|
||
|
||
if (!_pdfioDictGetValue(dict, "Type"))
|
||
pdfioDictSetName(dict, "Type", "Page");
|
||
|
||
// Create the page object...
|
||
if ((page = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||
return (NULL);
|
||
|
||
// Create a contents object to hold the contents of the page...
|
||
if ((contents_dict = pdfioDictCreate(pdf)) == NULL)
|
||
return (NULL);
|
||
|
||
#ifndef DEBUG
|
||
pdfioDictSetName(contents_dict, "Filter", "FlateDecode");
|
||
#endif // !DEBUG
|
||
|
||
if ((contents = pdfioFileCreateObj(pdf, contents_dict)) == NULL)
|
||
return (NULL);
|
||
|
||
// Add the contents stream to the pages object and write it...
|
||
pdfioDictSetObj(dict, "Contents", contents);
|
||
if (!pdfioObjClose(page))
|
||
return (NULL);
|
||
|
||
if (!_pdfioFileAddPage(pdf, page))
|
||
return (NULL);
|
||
|
||
// Create the contents stream...
|
||
#ifdef DEBUG
|
||
return (pdfioObjCreateStream(contents, PDFIO_FILTER_NONE));
|
||
#else
|
||
return (pdfioObjCreateStream(contents, PDFIO_FILTER_FLATE));
|
||
#endif // DEBUG
|
||
}
|
||
|
||
|
||
//
|
||
// '_pdfioFileFindMappedObj()' - Find a mapped object.
|
||
//
|
||
|
||
pdfio_obj_t * // O - Match object or `NULL` if none
|
||
_pdfioFileFindMappedObj(
|
||
pdfio_file_t *pdf, // I - Destination PDF file
|
||
pdfio_file_t *src_pdf, // I - Source PDF file
|
||
size_t src_number) // I - Source object number
|
||
{
|
||
_pdfio_objmap_t key, // Search key
|
||
*match; // Matching object map
|
||
|
||
|
||
// If we have no mapped objects, return NULL immediately...
|
||
if (pdf->num_objmaps == 0)
|
||
return (NULL);
|
||
|
||
// Otherwise search for a match...
|
||
key.src_pdf = src_pdf;
|
||
key.src_number = src_number;
|
||
|
||
if ((match = (_pdfio_objmap_t *)bsearch(&key, pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps)) != NULL)
|
||
return (match->obj);
|
||
else
|
||
return (NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileFindObj()' - Find an object using its object number.
|
||
//
|
||
// This differs from @link pdfioFileGetObj@ which takes an index into the
|
||
// list of objects while this function takes the object number.
|
||
//
|
||
|
||
pdfio_obj_t * // O - Object or `NULL` if not found
|
||
pdfioFileFindObj(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
size_t number) // I - Object number (1 to N)
|
||
{
|
||
pdfio_obj_t key, // Search key
|
||
*keyptr, // Pointer to key
|
||
**match; // Pointer to match
|
||
|
||
|
||
if (pdf->num_objs > 0)
|
||
{
|
||
key.number = number;
|
||
keyptr = &key;
|
||
match = (pdfio_obj_t **)bsearch(&keyptr, pdf->objs, pdf->num_objs, sizeof(pdfio_obj_t *), (int (*)(const void *, const void *))compare_objs);
|
||
|
||
return (match ? *match : NULL);
|
||
}
|
||
|
||
return (NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetAuthor()' - Get the author for a PDF file.
|
||
//
|
||
|
||
const char * // O - Author or `NULL` for none
|
||
pdfioFileGetAuthor(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Author") : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetCreationDate()' - Get the creation date for a PDF file.
|
||
//
|
||
|
||
time_t // O - Creation date or `0` for none
|
||
pdfioFileGetCreationDate(
|
||
pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetDate(pdf->info_obj->value.value.dict, "CreationDate") : 0);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetCreator()' - Get the creator string for a PDF file.
|
||
//
|
||
|
||
const char * // O - Creator string or `NULL` for none
|
||
pdfioFileGetCreator(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Creator") : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetID()' - Get the PDF file's ID strings.
|
||
//
|
||
|
||
pdfio_array_t * // O - Array with binary strings
|
||
pdfioFileGetID(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf ? pdf->id_array : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetKeywords()' - Get the keywords for a PDF file.
|
||
//
|
||
|
||
const char * // O - Keywords string or `NULL` for none
|
||
pdfioFileGetKeywords(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Keywords") : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetName()' - Get a PDF's filename.
|
||
//
|
||
|
||
const char * // O - Filename
|
||
pdfioFileGetName(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf ? pdf->filename : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetNumObjs()' - Get the number of objects in a PDF file.
|
||
//
|
||
|
||
size_t // O - Number of objects
|
||
pdfioFileGetNumObjs(
|
||
pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf ? pdf->num_objs : 0);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetNumPages()' - Get the number of pages in a PDF file.
|
||
//
|
||
|
||
size_t // O - Number of pages
|
||
pdfioFileGetNumPages(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf ? pdf->num_pages : 0);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetObj()' - Get an object from a PDF file.
|
||
//
|
||
|
||
pdfio_obj_t * // O - Object
|
||
pdfioFileGetObj(pdfio_file_t *pdf, // I - PDF file
|
||
size_t n) // I - Object index (starting at 0)
|
||
{
|
||
if (!pdf || n >= pdf->num_objs)
|
||
return (NULL);
|
||
else
|
||
return (pdf->objs[n]);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetPage()' - Get a page object from a PDF file.
|
||
//
|
||
|
||
pdfio_obj_t * // O - Object
|
||
pdfioFileGetPage(pdfio_file_t *pdf, // I - PDF file
|
||
size_t n) // I - Page index (starting at 0)
|
||
{
|
||
if (!pdf || n >= pdf->num_pages)
|
||
return (NULL);
|
||
else
|
||
return (pdf->pages[n]);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetPermissions()' - Get the access permissions of a PDF file.
|
||
//
|
||
// This function returns the access permissions of a PDF file and (optionally)
|
||
// the type of encryption that has been used.
|
||
//
|
||
|
||
pdfio_permission_t // O - Permission bits
|
||
pdfioFileGetPermissions(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
pdfio_encryption_t *encryption) // O - Type of encryption used or `NULL` to ignore
|
||
{
|
||
// Range check input...
|
||
if (!pdf)
|
||
{
|
||
if (encryption)
|
||
*encryption = PDFIO_ENCRYPTION_NONE;
|
||
|
||
return (PDFIO_PERMISSION_ALL);
|
||
}
|
||
|
||
// Return values...
|
||
if (encryption)
|
||
*encryption = pdf->encryption;
|
||
|
||
return (pdf->permissions);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetProducer()' - Get the producer string for a PDF file.
|
||
//
|
||
|
||
const char * // O - Producer string or `NULL` for none
|
||
pdfioFileGetProducer(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Producer") : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetSubject()' - Get the subject for a PDF file.
|
||
//
|
||
|
||
const char * // O - Subject or `NULL` for none
|
||
pdfioFileGetSubject(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Subject") : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetTitle()' - Get the title for a PDF file.
|
||
//
|
||
|
||
const char * // O - Title or `NULL` for none
|
||
pdfioFileGetTitle(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf && pdf->info_obj ? pdfioDictGetString(pdf->info_obj->value.value.dict, "Title") : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileGetVersion()' - Get the PDF version number for a PDF file.
|
||
//
|
||
|
||
const char * // O - Version number or `NULL`
|
||
pdfioFileGetVersion(
|
||
pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
return (pdf ? pdf->version : NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileOpen()' - Open a PDF file for reading.
|
||
//
|
||
// This function opens an existing PDF file. The "filename" argument specifies
|
||
// the name of the PDF file to create.
|
||
//
|
||
// The "password_cb" and "password_data" arguments specify a password callback
|
||
// and its data pointer for PDF files that use one of the standard Adobe
|
||
// "security" handlers. The callback returns a password string or `NULL` to
|
||
// cancel the open. If `NULL` is specified for the callback function and the
|
||
// PDF file requires a password, the open will always fail.
|
||
//
|
||
// The "error_cb" and "error_data" arguments specify an error handler callback
|
||
// and its data pointer - if `NULL` the default error handler is used that
|
||
// writes error messages to `stderr`.
|
||
//
|
||
|
||
pdfio_file_t * // O - PDF file
|
||
pdfioFileOpen(
|
||
const char *filename, // I - Filename
|
||
pdfio_password_cb_t password_cb, // I - Password callback or `NULL` for none
|
||
void *password_data, // I - Password callback data, if any
|
||
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
|
||
void *error_data) // I - Error callback data, if any
|
||
{
|
||
pdfio_file_t *pdf; // PDF file
|
||
char line[1024], // Line from file
|
||
*ptr; // Pointer into line
|
||
off_t xref_offset; // Offset to xref table
|
||
|
||
|
||
// Range check input...
|
||
if (!filename)
|
||
return (NULL);
|
||
|
||
if (!error_cb)
|
||
{
|
||
error_cb = _pdfioFileDefaultError;
|
||
error_data = NULL;
|
||
}
|
||
|
||
// Allocate a PDF file structure...
|
||
if ((pdf = (pdfio_file_t *)calloc(1, sizeof(pdfio_file_t))) == NULL)
|
||
{
|
||
pdfio_file_t temp; // Dummy file
|
||
char message[8192]; // Message string
|
||
|
||
temp.filename = (char *)filename;
|
||
snprintf(message, sizeof(message), "Unable to allocate memory for PDF file - %s", strerror(errno));
|
||
(error_cb)(&temp, message, error_data);
|
||
return (NULL);
|
||
}
|
||
|
||
pdf->filename = strdup(filename);
|
||
pdf->mode = _PDFIO_MODE_READ;
|
||
pdf->error_cb = error_cb;
|
||
pdf->error_data = error_data;
|
||
pdf->permissions = PDFIO_PERMISSION_ALL;
|
||
|
||
// Open the file...
|
||
if ((pdf->fd = open(filename, O_RDONLY | O_BINARY)) < 0)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to open file - %s", strerror(errno));
|
||
free(pdf->filename);
|
||
free(pdf);
|
||
return (NULL);
|
||
}
|
||
|
||
// Read the header from the first line...
|
||
if (!_pdfioFileGets(pdf, line, sizeof(line)))
|
||
goto error;
|
||
|
||
if ((strncmp(line, "%PDF-1.", 7) && strncmp(line, "%PDF-2.", 7)) || !isdigit(line[7] & 255))
|
||
{
|
||
// Bad header
|
||
_pdfioFileError(pdf, "Bad header '%s'.", line);
|
||
goto error;
|
||
}
|
||
|
||
// Copy the version number...
|
||
pdf->version = strdup(line + 5);
|
||
|
||
// Grab the last 32 characters of the file to find the start of the xref table...
|
||
if (_pdfioFileSeek(pdf, -32, SEEK_END) < 0)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to read startxref data.");
|
||
goto error;
|
||
}
|
||
|
||
if (_pdfioFileRead(pdf, line, 32) < 32)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to read startxref data.");
|
||
goto error;
|
||
}
|
||
line[32] = '\0';
|
||
|
||
if ((ptr = strstr(line, "startxref")) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to find start of xref table.");
|
||
goto error;
|
||
}
|
||
|
||
xref_offset = (off_t)strtol(ptr + 9, NULL, 10);
|
||
|
||
if (!load_xref(pdf, xref_offset, password_cb, password_data))
|
||
goto error;
|
||
|
||
return (pdf);
|
||
|
||
|
||
// If we get here we had a fatal read error...
|
||
error:
|
||
|
||
pdfioFileClose(pdf);
|
||
|
||
return (NULL);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetAuthor()' - Set the author for a PDF file.
|
||
//
|
||
|
||
void
|
||
pdfioFileSetAuthor(pdfio_file_t *pdf, // I - PDF file
|
||
const char *value) // I - Value
|
||
{
|
||
if (pdf && pdf->info_obj)
|
||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Author", pdfioStringCreate(pdf, value));
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetCreationDate()' - Set the creation date for a PDF file.
|
||
//
|
||
|
||
void
|
||
pdfioFileSetCreationDate(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
time_t value) // I - Value
|
||
{
|
||
if (pdf && pdf->info_obj)
|
||
pdfioDictSetDate(pdf->info_obj->value.value.dict, "CreationDate", value);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetCreator()' - Set the creator string for a PDF file.
|
||
//
|
||
|
||
void
|
||
pdfioFileSetCreator(pdfio_file_t *pdf, // I - PDF file
|
||
const char *value)// I - Value
|
||
{
|
||
if (pdf && pdf->info_obj)
|
||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Creator", pdfioStringCreate(pdf, value));
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetKeywords()' - Set the keywords string for a PDF file.
|
||
//
|
||
|
||
void
|
||
pdfioFileSetKeywords(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
const char *value) // I - Value
|
||
{
|
||
if (pdf && pdf->info_obj)
|
||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Keywords", pdfioStringCreate(pdf, value));
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetPermissions()' - Set the PDF permissions, encryption mode, and passwords.
|
||
//
|
||
// This function sets the PDF usage permissions, encryption mode, and
|
||
// passwords.
|
||
//
|
||
// > *Note*: This function must be called before creating or copying any
|
||
// > objects. Due to fundamental limitations in the PDF format, PDF encryption
|
||
// > offers little protection from disclosure. Permissions are not enforced in
|
||
// > any meaningful way.
|
||
//
|
||
|
||
bool // O - `true` on success, `false` otherwise
|
||
pdfioFileSetPermissions(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
pdfio_permission_t permissions, // I - Use permissions
|
||
pdfio_encryption_t encryption, // I - Type of encryption to use
|
||
const char *owner_password, // I - Owner password, if any
|
||
const char *user_password) // I - User password, if any
|
||
{
|
||
if (!pdf)
|
||
return (false);
|
||
|
||
if (pdf->num_objs > 2) // First two objects are pages and info
|
||
{
|
||
_pdfioFileError(pdf, "You must call pdfioFileSetPermissions before adding any objects.");
|
||
return (false);
|
||
}
|
||
|
||
if (encryption == PDFIO_ENCRYPTION_NONE)
|
||
return (true);
|
||
|
||
return (_pdfioCryptoLock(pdf, permissions, encryption, owner_password, user_password));
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetSubject()' - Set the subject for a PDF file.
|
||
//
|
||
|
||
void
|
||
pdfioFileSetSubject(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
const char *value) // I - Value
|
||
{
|
||
if (pdf && pdf->info_obj)
|
||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Subject", pdfioStringCreate(pdf, value));
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioFileSetTitle()' - Set the title for a PDF file.
|
||
//
|
||
|
||
void
|
||
pdfioFileSetTitle(pdfio_file_t *pdf, // I - PDF file
|
||
const char *value) // I - Value
|
||
{
|
||
if (pdf && pdf->info_obj)
|
||
pdfioDictSetString(pdf->info_obj->value.value.dict, "Title", pdfioStringCreate(pdf, value));
|
||
}
|
||
|
||
|
||
//
|
||
// '_pdfioObjAdd()' - Add an object to a file.
|
||
//
|
||
|
||
static pdfio_obj_t * // O - Object
|
||
add_obj(pdfio_file_t *pdf, // I - PDF file
|
||
size_t number, // I - Object number
|
||
unsigned short generation, // I - Object generation
|
||
off_t offset) // I - Offset in file
|
||
{
|
||
pdfio_obj_t *obj; // Object
|
||
|
||
|
||
// Allocate memory for the object...
|
||
if ((obj = (pdfio_obj_t *)calloc(1, sizeof(pdfio_obj_t))) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to allocate memory for object - %s", strerror(errno));
|
||
return (NULL);
|
||
}
|
||
|
||
// Expand the objects array as needed
|
||
if (pdf->num_objs >= pdf->alloc_objs)
|
||
{
|
||
pdfio_obj_t **temp = (pdfio_obj_t **)realloc(pdf->objs, (pdf->alloc_objs + 32) * sizeof(pdfio_obj_t *));
|
||
|
||
if (!temp)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to allocate memory for object - %s", strerror(errno));
|
||
free(obj);
|
||
return (NULL);
|
||
}
|
||
|
||
pdf->objs = temp;
|
||
pdf->alloc_objs += 32;
|
||
}
|
||
|
||
pdf->objs[pdf->num_objs ++] = obj;
|
||
|
||
obj->pdf = pdf;
|
||
obj->number = number;
|
||
obj->generation = generation;
|
||
obj->offset = offset;
|
||
|
||
PDFIO_DEBUG("add_obj: obj=%p, ->pdf=%p, ->number=%lu\n", obj, pdf, (unsigned long)obj->number);
|
||
|
||
// Re-sort object array as needed...
|
||
if (pdf->num_objs > 1 && pdf->objs[pdf->num_objs - 2]->number > number)
|
||
qsort(pdf->objs, pdf->num_objs, sizeof(pdfio_obj_t *), (int (*)(const void *, const void *))compare_objs);
|
||
|
||
return (obj);
|
||
}
|
||
|
||
|
||
//
|
||
// 'compare_objmaps()' - Compare two object maps...
|
||
//
|
||
|
||
static int // O - Result of comparison
|
||
compare_objmaps(_pdfio_objmap_t *a, // I - First object map
|
||
_pdfio_objmap_t *b) // I - Second object map
|
||
{
|
||
if (a->src_pdf < b->src_pdf)
|
||
return (-1);
|
||
else if (a->src_pdf > b->src_pdf)
|
||
return (1);
|
||
else if (a->src_number < b->src_number)
|
||
return (-1);
|
||
else if (a->src_number > b->src_number)
|
||
return (1);
|
||
else
|
||
return (0);
|
||
}
|
||
|
||
|
||
//
|
||
// 'compare_objs()' - Compare the object numbers of two objects.
|
||
//
|
||
|
||
static int // O - Result of comparison
|
||
compare_objs(pdfio_obj_t **a, // I - First object
|
||
pdfio_obj_t **b) // I - Second object
|
||
{
|
||
if ((*a)->number < (*b)->number)
|
||
return (-1);
|
||
else if ((*a)->number == (*b)->number)
|
||
return (0);
|
||
else
|
||
return (1);
|
||
}
|
||
|
||
|
||
//
|
||
// 'load_obj_stream()' - Load an object stream.
|
||
//
|
||
// Object streams are Adobe's complicated solution for saving a few
|
||
// kilobytes in an average PDF file at the expense of massively more
|
||
// complicated reader applications.
|
||
//
|
||
// Each object stream starts with pairs of object numbers and offsets,
|
||
// followed by the object values (typically dictionaries). For
|
||
// simplicity pdfio loads all of these values into memory so that we
|
||
// don't later have to randomly access compressed stream data to get
|
||
// a dictionary.
|
||
//
|
||
|
||
static bool // O - `true` on success, `false` on error
|
||
load_obj_stream(pdfio_obj_t *obj) // I - Object to load
|
||
{
|
||
pdfio_stream_t *st; // Stream
|
||
_pdfio_token_t tb; // Token buffer/stack
|
||
char buffer[32]; // Token
|
||
size_t number, // Object number
|
||
cur_obj, // Current object
|
||
num_objs = 0; // Number of objects
|
||
pdfio_obj_t *objs[16384]; // Objects
|
||
|
||
|
||
PDFIO_DEBUG("load_obj_stream(obj=%p(%d))\n", obj, (int)obj->number);
|
||
|
||
// Open the object stream...
|
||
if ((st = pdfioObjOpenStream(obj, true)) == NULL)
|
||
{
|
||
_pdfioFileError(obj->pdf, "Unable to open compressed object stream %lu.", (unsigned long)obj->number);
|
||
return (false);
|
||
}
|
||
|
||
_pdfioTokenInit(&tb, obj->pdf, (_pdfio_tconsume_cb_t)pdfioStreamConsume, (_pdfio_tpeek_cb_t)pdfioStreamPeek, st);
|
||
|
||
// Read the object numbers from the beginning of the stream...
|
||
while (_pdfioTokenGet(&tb, buffer, sizeof(buffer)))
|
||
{
|
||
// Stop if this isn't an object number...
|
||
if (!isdigit(buffer[0] & 255))
|
||
break;
|
||
|
||
// Stop if we have too many objects...
|
||
if (num_objs >= (sizeof(objs) / sizeof(objs[0])))
|
||
{
|
||
_pdfioFileError(obj->pdf, "Too many compressed objects in one stream.");
|
||
pdfioStreamClose(st);
|
||
return (false);
|
||
}
|
||
|
||
// Add the object in memory...
|
||
number = (size_t)strtoimax(buffer, NULL, 10);
|
||
|
||
if ((objs[num_objs] = pdfioFileFindObj(obj->pdf, number)) == NULL)
|
||
objs[num_objs] = add_obj(obj->pdf, number, 0, 0);
|
||
|
||
num_objs ++;
|
||
|
||
// Skip offset
|
||
_pdfioTokenGet(&tb, buffer, sizeof(buffer));
|
||
}
|
||
|
||
if (!buffer[0])
|
||
{
|
||
pdfioStreamClose(st);
|
||
return (false);
|
||
}
|
||
|
||
_pdfioTokenPush(&tb, buffer);
|
||
|
||
// Read the objects themselves...
|
||
for (cur_obj = 0; cur_obj < num_objs; cur_obj ++)
|
||
{
|
||
if (!_pdfioValueRead(obj->pdf, obj, &tb, &(objs[cur_obj]->value), 0))
|
||
{
|
||
pdfioStreamClose(st);
|
||
return (false);
|
||
}
|
||
}
|
||
|
||
// Close the stream and return
|
||
pdfioStreamClose(st);
|
||
|
||
return (true);
|
||
}
|
||
|
||
|
||
//
|
||
// 'load_pages()' - Load pages in the document.
|
||
//
|
||
|
||
static bool // O - `true` on success, `false` on error
|
||
load_pages(pdfio_file_t *pdf, // I - PDF file
|
||
pdfio_obj_t *obj, // I - Page object
|
||
size_t depth) // I - Depth of page tree
|
||
{
|
||
pdfio_dict_t *dict; // Page object dictionary
|
||
const char *type; // Node type
|
||
pdfio_array_t *kids; // Kids array
|
||
|
||
|
||
// Range check input...
|
||
if (!obj)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to find pages object.");
|
||
return (false);
|
||
}
|
||
|
||
// Get the object dictionary and make sure this is a Pages or Page object...
|
||
if ((dict = pdfioObjGetDict(obj)) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "No dictionary for pages object.");
|
||
return (false);
|
||
}
|
||
|
||
if ((type = pdfioDictGetName(dict, "Type")) == NULL || (strcmp(type, "Pages") && strcmp(type, "Page")))
|
||
return (false);
|
||
|
||
// If there is a Kids array, then this is a parent node and we have to look
|
||
// at the child objects...
|
||
if ((kids = pdfioDictGetArray(dict, "Kids")) != NULL)
|
||
{
|
||
// Load the child objects...
|
||
size_t i, // Looping var
|
||
num_kids; // Number of elements in array
|
||
|
||
if (depth >= PDFIO_MAX_DEPTH)
|
||
{
|
||
_pdfioFileError(pdf, "Depth of pages objects too great to load.");
|
||
return (false);
|
||
}
|
||
|
||
for (i = 0, num_kids = pdfioArrayGetSize(kids); i < num_kids; i ++)
|
||
{
|
||
if (!load_pages(pdf, pdfioArrayGetObj(kids, i), depth + 1))
|
||
return (false);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
// Add this page...
|
||
if (pdf->num_pages >= pdf->alloc_pages)
|
||
{
|
||
pdfio_obj_t **temp = (pdfio_obj_t **)realloc(pdf->pages, (pdf->alloc_pages + 32) * sizeof(pdfio_obj_t *));
|
||
|
||
if (!temp)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to allocate memory for pages.");
|
||
return (false);
|
||
}
|
||
|
||
pdf->alloc_pages += 32;
|
||
pdf->pages = temp;
|
||
}
|
||
|
||
pdf->pages[pdf->num_pages ++] = obj;
|
||
}
|
||
|
||
return (true);
|
||
}
|
||
|
||
|
||
//
|
||
// 'load_xref()' - Load an XREF table...
|
||
//
|
||
|
||
static bool // O - `true` on success, `false` on failure
|
||
load_xref(
|
||
pdfio_file_t *pdf, // I - PDF file
|
||
off_t xref_offset, // I - Offset to xref
|
||
pdfio_password_cb_t password_cb, // I - Password callback or `NULL` for none
|
||
void *password_data) // I - Password callback data, if any
|
||
{
|
||
bool done = false; // Are we done?
|
||
char line[1024], // Line from file
|
||
*ptr; // Pointer into line
|
||
_pdfio_value_t trailer; // Trailer dictionary
|
||
intmax_t number, // Object number
|
||
num_objects, // Number of objects
|
||
offset; // Offset in file
|
||
int generation; // Generation number
|
||
_pdfio_token_t tb; // Token buffer/stack
|
||
off_t line_offset; // Offset to start of line
|
||
|
||
|
||
while (!done)
|
||
{
|
||
if (_pdfioFileSeek(pdf, xref_offset, SEEK_SET) != xref_offset)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to seek to start of xref table.");
|
||
return (false);
|
||
}
|
||
|
||
do
|
||
{
|
||
line_offset = _pdfioFileTell(pdf);
|
||
|
||
if (!_pdfioFileGets(pdf, line, sizeof(line)))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to read start of xref table.");
|
||
return (false);
|
||
}
|
||
}
|
||
while (!line[0]);
|
||
|
||
PDFIO_DEBUG("load_xref: line_offset=%lu, line='%s'\n", (unsigned long)line_offset, line);
|
||
|
||
if (isdigit(line[0] & 255) && strlen(line) > 4 && (!strcmp(line + strlen(line) - 4, " obj") || ((ptr = strstr(line, " obj")) != NULL && ptr[4] == '<')))
|
||
{
|
||
// Cross-reference stream
|
||
pdfio_obj_t *obj; // Object
|
||
size_t i; // Looping var
|
||
pdfio_array_t *index_array; // Index array
|
||
size_t index_n, // Current element in array
|
||
index_count, // Number of values in index array
|
||
count; // Number of objects in current pairing
|
||
pdfio_array_t *w_array; // W array
|
||
size_t w[3]; // Size of each cross-reference field
|
||
size_t w_2, // Offset to second field
|
||
w_3; // Offset to third field
|
||
size_t w_total; // Total length
|
||
pdfio_stream_t *st; // Stream
|
||
unsigned char buffer[32]; // Read buffer
|
||
size_t num_sobjs = 0, // Number of object streams
|
||
sobjs[4096]; // Object streams to load
|
||
pdfio_obj_t *current; // Current object
|
||
|
||
if ((number = strtoimax(line, &ptr, 10)) < 1)
|
||
{
|
||
_pdfioFileError(pdf, "Bad xref table header '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
if ((generation = (int)strtol(ptr, &ptr, 10)) < 0 || generation > 65535)
|
||
{
|
||
_pdfioFileError(pdf, "Bad xref table header '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
while (isspace(*ptr & 255))
|
||
ptr ++;
|
||
|
||
if (strncmp(ptr, "obj", 3))
|
||
{
|
||
_pdfioFileError(pdf, "Bad xref table header '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
if (_pdfioFileSeek(pdf, line_offset + ptr + 3 - line, SEEK_SET) < 0)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to seek to xref object %lu %u.", (unsigned long)number, (unsigned)generation);
|
||
return (false);
|
||
}
|
||
|
||
PDFIO_DEBUG("load_xref: Loading object %lu %u.\n", (unsigned long)number, (unsigned)generation);
|
||
|
||
if ((obj = add_obj(pdf, (size_t)number, (unsigned short)generation, xref_offset)) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to allocate memory for object.");
|
||
return (false);
|
||
}
|
||
|
||
_pdfioTokenInit(&tb, pdf, (_pdfio_tconsume_cb_t)_pdfioFileConsume, (_pdfio_tpeek_cb_t)_pdfioFilePeek, pdf);
|
||
|
||
if (!_pdfioValueRead(pdf, obj, &tb, &trailer, 0))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to read cross-reference stream dictionary.");
|
||
return (false);
|
||
}
|
||
else if (trailer.type != PDFIO_VALTYPE_DICT)
|
||
{
|
||
_pdfioFileError(pdf, "Cross-reference stream does not have a dictionary.");
|
||
return (false);
|
||
}
|
||
|
||
obj->value = trailer;
|
||
|
||
if (!_pdfioTokenGet(&tb, line, sizeof(line)) || strcmp(line, "stream"))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to get stream after xref dictionary.");
|
||
return (false);
|
||
}
|
||
|
||
_pdfioTokenFlush(&tb);
|
||
|
||
obj->stream_offset = _pdfioFileTell(pdf);
|
||
|
||
if ((index_array = pdfioDictGetArray(trailer.value.dict, "Index")) != NULL)
|
||
index_count = index_array->num_values;
|
||
else
|
||
index_count = 1;
|
||
|
||
if ((w_array = pdfioDictGetArray(trailer.value.dict, "W")) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Cross-reference stream does not have required W key.");
|
||
return (false);
|
||
}
|
||
|
||
w[0] = (size_t)pdfioArrayGetNumber(w_array, 0);
|
||
w[1] = (size_t)pdfioArrayGetNumber(w_array, 1);
|
||
w[2] = (size_t)pdfioArrayGetNumber(w_array, 2);
|
||
w_total = w[0] + w[1] + w[2];
|
||
w_2 = w[0];
|
||
w_3 = w[0] + w[1];
|
||
|
||
if (w[1] == 0 || w[2] > 2 || w[0] > sizeof(buffer) || w[1] > sizeof(buffer) || w[2] > sizeof(buffer) || w_total > sizeof(buffer))
|
||
{
|
||
_pdfioFileError(pdf, "Cross-reference stream has invalid W key.");
|
||
return (false);
|
||
}
|
||
|
||
if ((st = pdfioObjOpenStream(obj, true)) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to open cross-reference stream.");
|
||
return (false);
|
||
}
|
||
|
||
for (index_n = 0; index_n < index_count; index_n += 2)
|
||
{
|
||
if (index_count == 1)
|
||
{
|
||
number = 0;
|
||
count = 999999999;
|
||
}
|
||
else
|
||
{
|
||
number = (intmax_t)pdfioArrayGetNumber(index_array, index_n);
|
||
count = (size_t)pdfioArrayGetNumber(index_array, index_n + 1);
|
||
}
|
||
|
||
while (count > 0 && pdfioStreamRead(st, buffer, w_total) > 0)
|
||
{
|
||
count --;
|
||
|
||
PDFIO_DEBUG("load_xref: number=%u %02X%02X%02X%02X%02X\n", (unsigned)number, buffer[0], buffer[1], buffer[2], buffer[3], buffer[4]);
|
||
|
||
// Check whether this is an object definition...
|
||
if (w[0] > 0)
|
||
{
|
||
if (buffer[0] == 0)
|
||
{
|
||
// Ignore free objects...
|
||
number ++;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
for (i = 1, offset = buffer[w_2]; i < w[1]; i ++)
|
||
offset = (offset << 8) | buffer[w_2 + i];
|
||
|
||
switch (w[2])
|
||
{
|
||
default :
|
||
generation = 0;
|
||
break;
|
||
case 1 :
|
||
generation = buffer[w_3];
|
||
break;
|
||
case 2 :
|
||
generation = (buffer[w_3] << 8) | buffer[w_3 + 1];
|
||
break;
|
||
}
|
||
|
||
// Create a placeholder for the object in memory...
|
||
if ((current = pdfioFileFindObj(pdf, (size_t)number)) != NULL)
|
||
{
|
||
PDFIO_DEBUG("load_xref: existing object, prev offset=%u\n", (unsigned)current->offset);
|
||
|
||
if (w[0] == 0 || buffer[0] == 1)
|
||
{
|
||
// Location of object...
|
||
current->offset = offset;
|
||
}
|
||
else if (number != offset)
|
||
{
|
||
// Object is part of a stream, offset is the object number...
|
||
current->offset = 0;
|
||
}
|
||
|
||
PDFIO_DEBUG("load_xref: new offset=%u\n", (unsigned)current->offset);
|
||
}
|
||
|
||
if (w[0] > 0 && buffer[0] == 2)
|
||
{
|
||
// Object streams need to be loaded into memory, so add them
|
||
// to the list of objects to load later as needed...
|
||
for (i = 0; i < num_sobjs; i ++)
|
||
{
|
||
if (sobjs[i] == (size_t)offset)
|
||
break;
|
||
}
|
||
|
||
if (i >= num_sobjs && num_sobjs < (sizeof(sobjs) / sizeof(sobjs[0])))
|
||
sobjs[num_sobjs ++] = (size_t)offset;
|
||
}
|
||
else if (!current)
|
||
{
|
||
// Add this object...
|
||
if (!add_obj(pdf, (size_t)number, (unsigned short)generation, offset))
|
||
return (false);
|
||
}
|
||
|
||
number ++;
|
||
}
|
||
}
|
||
|
||
pdfioStreamClose(st);
|
||
|
||
if (!pdf->trailer_dict)
|
||
{
|
||
// Save the trailer dictionary and grab the root (catalog) and info
|
||
// objects...
|
||
pdf->trailer_dict = trailer.value.dict;
|
||
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
|
||
pdf->encrypt_obj = pdfioDictGetObj(pdf->trailer_dict, "Encrypt");
|
||
pdf->id_array = pdfioDictGetArray(pdf->trailer_dict, "ID");
|
||
|
||
// If the trailer contains an Encrypt key, try unlocking the file...
|
||
if (pdf->encrypt_obj && !_pdfioCryptoUnlock(pdf, password_cb, password_data))
|
||
return (false);
|
||
}
|
||
|
||
// Load any object streams that are left...
|
||
PDFIO_DEBUG("load_xref: %lu compressed object streams to load.\n", (unsigned long)num_sobjs);
|
||
|
||
for (i = 0; i < num_sobjs; i ++)
|
||
{
|
||
if ((obj = pdfioFileFindObj(pdf, sobjs[i])) != NULL)
|
||
{
|
||
PDFIO_DEBUG("load_xref: Loading compressed object stream %lu (pdf=%p, obj->pdf=%p).\n", (unsigned long)sobjs[i], pdf, obj->pdf);
|
||
|
||
if (!load_obj_stream(obj))
|
||
return (false);
|
||
}
|
||
else
|
||
{
|
||
_pdfioFileError(pdf, "Unable to find compressed object stream %lu.", (unsigned long)sobjs[i]);
|
||
return (false);
|
||
}
|
||
}
|
||
}
|
||
else if (!strcmp(line, "xref"))
|
||
{
|
||
// Read the xref tables
|
||
while (_pdfioFileGets(pdf, line, sizeof(line)))
|
||
{
|
||
if (!strcmp(line, "trailer"))
|
||
break;
|
||
else if (!line[0])
|
||
continue;
|
||
|
||
if (sscanf(line, "%jd%jd", &number, &num_objects) != 2)
|
||
{
|
||
_pdfioFileError(pdf, "Malformed xref table section '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
// Read this group of objects...
|
||
for (; num_objects > 0; num_objects --, number ++)
|
||
{
|
||
// Read a line from the file and validate it...
|
||
if (_pdfioFileRead(pdf, line, 20) != 20)
|
||
return (false);
|
||
|
||
line[20] = '\0';
|
||
|
||
if (strcmp(line + 18, "\r\n") && strcmp(line + 18, " \n") && strcmp(line + 18, " \r"))
|
||
{
|
||
_pdfioFileError(pdf, "Malformed xref table entry '%s'.", line);
|
||
return (false);
|
||
}
|
||
line[18] = '\0';
|
||
|
||
// Parse the line
|
||
if ((offset = strtoimax(line, &ptr, 10)) < 0)
|
||
{
|
||
_pdfioFileError(pdf, "Malformed xref table entry '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
if ((generation = (int)strtol(ptr, &ptr, 10)) < 0 || generation > 65535)
|
||
{
|
||
_pdfioFileError(pdf, "Malformed xref table entry '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
if (*ptr != ' ')
|
||
{
|
||
_pdfioFileError(pdf, "Malformed xref table entry '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
ptr ++;
|
||
if (*ptr != 'f' && *ptr != 'n')
|
||
{
|
||
_pdfioFileError(pdf, "Malformed xref table entry '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
if (*ptr == 'f')
|
||
continue; // Don't care about free objects...
|
||
|
||
// Create a placeholder for the object in memory...
|
||
if (pdfioFileFindObj(pdf, (size_t)number))
|
||
continue; // Don't replace newer object...
|
||
|
||
if (!add_obj(pdf, (size_t)number, (unsigned short)generation, offset))
|
||
return (false);
|
||
}
|
||
}
|
||
|
||
if (strcmp(line, "trailer"))
|
||
{
|
||
_pdfioFileError(pdf, "Missing trailer.");
|
||
return (false);
|
||
}
|
||
|
||
_pdfioTokenInit(&tb, pdf, (_pdfio_tconsume_cb_t)_pdfioFileConsume, (_pdfio_tpeek_cb_t)_pdfioFilePeek, pdf);
|
||
|
||
if (!_pdfioValueRead(pdf, NULL, &tb, &trailer, 0))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to read trailer dictionary.");
|
||
return (false);
|
||
}
|
||
else if (trailer.type != PDFIO_VALTYPE_DICT)
|
||
{
|
||
_pdfioFileError(pdf, "Trailer is not a dictionary.");
|
||
return (false);
|
||
}
|
||
|
||
_pdfioTokenFlush(&tb);
|
||
|
||
if (!pdf->trailer_dict)
|
||
{
|
||
// Save the trailer dictionary and grab the root (catalog) and info
|
||
// objects...
|
||
pdf->trailer_dict = trailer.value.dict;
|
||
pdf->info_obj = pdfioDictGetObj(pdf->trailer_dict, "Info");
|
||
pdf->encrypt_obj = pdfioDictGetObj(pdf->trailer_dict, "Encrypt");
|
||
pdf->id_array = pdfioDictGetArray(pdf->trailer_dict, "ID");
|
||
|
||
// If the trailer contains an Encrypt key, try unlocking the file...
|
||
if (pdf->encrypt_obj && !_pdfioCryptoUnlock(pdf, password_cb, password_data))
|
||
return (false);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
_pdfioFileError(pdf, "Bad xref table header '%s'.", line);
|
||
return (false);
|
||
}
|
||
|
||
PDFIO_DEBUG("load_xref: Contents of trailer dictionary:\n");
|
||
PDFIO_DEBUG("load_xref: ");
|
||
PDFIO_DEBUG_VALUE(&trailer);
|
||
PDFIO_DEBUG("\n");
|
||
|
||
if ((xref_offset = (off_t)pdfioDictGetNumber(trailer.value.dict, "Prev")) <= 0)
|
||
done = true;
|
||
}
|
||
|
||
// Once we have all of the xref tables loaded, get the important objects and
|
||
// build the pages array...
|
||
if ((pdf->root_obj = pdfioDictGetObj(pdf->trailer_dict, "Root")) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Missing Root object.");
|
||
return (false);
|
||
}
|
||
|
||
PDFIO_DEBUG("load_xref: Root=%p(%lu)\n", pdf->root_obj, (unsigned long)pdf->root_obj->number);
|
||
|
||
return (load_pages(pdf, pdfioDictGetObj(pdfioObjGetDict(pdf->root_obj), "Pages"), 0));
|
||
}
|
||
|
||
|
||
//
|
||
// 'write_catalog()' - Write the PDF root object/catalog.
|
||
//
|
||
|
||
static bool // O - `true` on success, `false` on failure
|
||
write_catalog(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
pdfio_dict_t *dict; // Dictionary for catalog...
|
||
|
||
|
||
if ((dict = pdfioDictCreate(pdf)) == NULL)
|
||
return (false);
|
||
|
||
pdfioDictSetName(dict, "Type", "Catalog");
|
||
pdfioDictSetObj(dict, "Pages", pdf->pages_obj);
|
||
// TODO: Add support for all of the root object dictionary keys
|
||
|
||
if ((pdf->root_obj = pdfioFileCreateObj(pdf, dict)) == NULL)
|
||
return (false);
|
||
else
|
||
return (pdfioObjClose(pdf->root_obj));
|
||
}
|
||
|
||
|
||
//
|
||
// 'write_pages()' - Write the PDF pages objects.
|
||
//
|
||
|
||
static bool // O - `true` on success, `false` on failure
|
||
write_pages(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
pdfio_array_t *kids; // Pages array
|
||
size_t i; // Looping var
|
||
|
||
|
||
// Build the "Kids" array pointing to each page...
|
||
if ((kids = pdfioArrayCreate(pdf)) == NULL)
|
||
return (false);
|
||
|
||
for (i = 0; i < pdf->num_pages; i ++)
|
||
pdfioArrayAppendObj(kids, pdf->pages[i]);
|
||
|
||
pdfioDictSetNumber(pdf->pages_obj->value.value.dict, "Count", pdf->num_pages);
|
||
pdfioDictSetArray(pdf->pages_obj->value.value.dict, "Kids", kids);
|
||
|
||
// Write the Pages object...
|
||
return (pdfioObjClose(pdf->pages_obj));
|
||
}
|
||
|
||
|
||
//
|
||
// 'write_trailer()' - Write the PDF catalog object, xref table, and trailer.
|
||
//
|
||
|
||
static bool // O - `true` on success, `false` on failure
|
||
write_trailer(pdfio_file_t *pdf) // I - PDF file
|
||
{
|
||
bool ret = true; // Return value
|
||
off_t xref_offset; // Offset to xref table
|
||
size_t i; // Looping var
|
||
|
||
|
||
// Write the xref table...
|
||
// TODO: Look at adding support for xref streams...
|
||
xref_offset = _pdfioFileTell(pdf);
|
||
|
||
if (!_pdfioFilePrintf(pdf, "xref\n0 %lu \n0000000000 65535 f \n", (unsigned long)pdf->num_objs + 1))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to write cross-reference table.");
|
||
ret = false;
|
||
goto done;
|
||
}
|
||
|
||
for (i = 0; i < pdf->num_objs; i ++)
|
||
{
|
||
pdfio_obj_t *obj = pdf->objs[i]; // Current object
|
||
|
||
if (!_pdfioFilePrintf(pdf, "%010lu %05u n \n", (unsigned long)obj->offset, obj->generation))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to write cross-reference table.");
|
||
ret = false;
|
||
goto done;
|
||
}
|
||
}
|
||
|
||
// Write the trailer...
|
||
if (!_pdfioFilePuts(pdf, "trailer\n"))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to write trailer.");
|
||
ret = false;
|
||
goto done;
|
||
}
|
||
|
||
if ((pdf->trailer_dict = pdfioDictCreate(pdf)) == NULL)
|
||
{
|
||
_pdfioFileError(pdf, "Unable to create trailer.");
|
||
ret = false;
|
||
goto done;
|
||
}
|
||
|
||
if (pdf->encrypt_obj)
|
||
pdfioDictSetObj(pdf->trailer_dict, "Encrypt", pdf->encrypt_obj);
|
||
if (pdf->id_array)
|
||
pdfioDictSetArray(pdf->trailer_dict, "ID", pdf->id_array);
|
||
pdfioDictSetObj(pdf->trailer_dict, "Info", pdf->info_obj);
|
||
pdfioDictSetObj(pdf->trailer_dict, "Root", pdf->root_obj);
|
||
pdfioDictSetNumber(pdf->trailer_dict, "Size", pdf->num_objs + 1);
|
||
|
||
if (!_pdfioDictWrite(pdf->trailer_dict, NULL, NULL))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to write trailer.");
|
||
ret = false;
|
||
goto done;
|
||
}
|
||
|
||
if (!_pdfioFilePrintf(pdf, "\nstartxref\n%lu\n%%EOF\n", (unsigned long)xref_offset))
|
||
{
|
||
_pdfioFileError(pdf, "Unable to write xref offset.");
|
||
ret = false;
|
||
}
|
||
|
||
done:
|
||
|
||
return (ret);
|
||
}
|