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pdfio-file.c
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pdfio-file.c
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//
// PDF file functions for PDFio.
//
// Copyright © 2021-2024 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
#include "pdfio-private.h"
#ifndef O_BINARY
# define O_BINARY 0
#endif // !O_BINARY
//
// Local functions...
//
static pdfio_obj_t *add_obj(pdfio_file_t *pdf, size_t number, unsigned short generation, off_t offset);
static int compare_objmaps(_pdfio_objmap_t *a, _pdfio_objmap_t *b);
static pdfio_file_t *create_common(const char *filename, int fd, pdfio_output_cb_t output_cb, void *output_cbdata, const char *version, pdfio_rect_t *media_box, pdfio_rect_t *crop_box, pdfio_error_cb_t error_cb, void *error_cbdata);
static const char *get_info_string(pdfio_file_t *pdf, const char *key);
static struct lconv *get_lconv(void);
static bool load_obj_stream(pdfio_obj_t *obj);
static bool load_pages(pdfio_file_t *pdf, pdfio_obj_t *obj, size_t depth);
static bool load_xref(pdfio_file_t *pdf, off_t xref_offset, pdfio_password_cb_t password_cb, void *password_data);
static bool write_pages(pdfio_file_t *pdf);
static bool write_trailer(pdfio_file_t *pdf);
//
// '_pdfioFileAddMappedObj()' - Add a mapped object.
//
bool // O - `true` on success, `false` on failure
_pdfioFileAddMappedObj(
pdfio_file_t *pdf, // I - Destination PDF file
pdfio_obj_t *dst_obj, // I - Destination object
pdfio_obj_t *src_obj) // I - Source object
{
_pdfio_objmap_t *map; // Object map
// Allocate memory as needed...
if (pdf->num_objmaps >= pdf->alloc_objmaps)
{
if ((map = realloc(pdf->objmaps, (pdf->alloc_objmaps + 16) * sizeof(_pdfio_objmap_t))) == NULL)
{
_pdfioFileError(pdf, "Unable to allocate memory for object map.");
return (false);
}
pdf->alloc_objmaps += 16;
pdf->objmaps = map;
}
// Add an object to the end...
map = pdf->objmaps + pdf->num_objmaps;
pdf->num_objmaps ++;
map->obj = dst_obj;
map->src_pdf = src_obj->pdf;
map->src_number = src_obj->number;
// Sort as needed...
if (pdf->num_objmaps > 1 && compare_objmaps(map, pdf->objmaps + pdf->num_objmaps - 2) < 0)
qsort(pdf->objmaps, pdf->num_objmaps, sizeof(_pdfio_objmap_t), (int (*)(const void *, const void *))compare_objmaps);
return (true);
}
//
// '_pdfioFileAddPage()' - Add a page to a PDF file.
//
bool // O - `true` on success and `false` on failure
_pdfioFileAddPage(pdfio_file_t *pdf, // I - PDF file
pdfio_obj_t *obj) // I - Page object
{
// Add the page to the array of pages...
if (pdf->num_pages >= pdf->alloc_pages)
{
pdfio_obj_t **temp = (pdfio_obj_t **)realloc(pdf->pages, (pdf->alloc_pages + 16) * sizeof(pdfio_obj_t *));
if (!temp)
{
_pdfioFileError(pdf, "Unable to allocate memory for pages.");
return (false);
}
pdf->alloc_pages += 16;
pdf->pages = temp;
}
pdf->pages[pdf->num_pages ++] = obj;
return (true);
}
//
// 'pdfioFileClose()' - Close a PDF file and free all memory used for it.
//
bool // O - `true` on success and `false` on failure
pdfioFileClose(pdfio_file_t *pdf) // I - PDF file
{
bool ret = true; // Return value
size_t i; // Looping var
// Range check input
if (!pdf)
return (false);
// Close the file itself...
if (pdf->mode == _PDFIO_MODE_WRITE)
{
ret = false;
if (pdfioObjClose(pdf->info_obj) && write_pages(pdf) && pdfioObjClose(pdf->root_obj) && write_trailer(pdf))
ret = _pdfioFileFlush(pdf);
}
if (pdf->fd >= 0 && close(pdf->fd) < 0)
ret = false;
// Free all data...
free(pdf->filename);
free(pdf->version);
for (i = 0; i < pdf->num_arrays; i ++)
_pdfioArrayDelete(pdf->arrays[i]);
free(pdf->arrays);
for (i = 0; i < pdf->num_dicts; i ++)
_pdfioDictDelete(pdf->dicts[i]);
free(pdf->dicts);
for (i = 0; i < pdf->num_objs; i ++)
_pdfioObjDelete(pdf->objs[i]);
free(pdf->objs);
free(pdf->objmaps);
free(pdf->pages);
for (i = 0; i < pdf->num_strings; i ++)
free(pdf->strings[i]);
free(pdf->strings);
free(pdf);
return (ret);
}
//
// 'pdfioFileCreate()' - Create a PDF file.
//
// This function creates a new PDF file. The "filename" argument specifies the
// name of the PDF file to create.
//
// The "version" argument specifies the PDF version number for the file or
// `NULL` for the default ("2.0").
//
// The "media_box" and "crop_box" arguments specify the default MediaBox and
// CropBox for pages in the PDF file - if `NULL` then a default "Universal" size
// of 8.27x11in (the intersection of US Letter and ISO A4) is used.
//
// The "error_cb" and "error_cbdata" 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 or `NULL` on error
pdfioFileCreate(
const char *filename, // I - Filename
const char *version, // I - PDF version number or `NULL` for default (2.0)
pdfio_rect_t *media_box, // I - Default MediaBox for pages
pdfio_rect_t *crop_box, // I - Default CropBox for pages
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_cbdata) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
int fd; // File descriptor
PDFIO_DEBUG("pdfioFileCreate(filename=\"%s\", version=\"%s\", media_box=%p, crop_box=%p, error_cb=%p, error_cbdata=%p)\n", filename, version, (void *)media_box, (void *)crop_box, (void *)error_cb, (void *)error_cbdata);
// Range check input...
if (!filename)
return (NULL);
// Create the file...
if ((fd = open(filename, O_WRONLY | O_BINARY | O_CREAT | O_TRUNC, 0666)) < 0)
{
pdfio_file_t temp; // Dummy file
char message[8192]; // Message string
temp.filename = (char *)filename;
snprintf(message, sizeof(message), "Unable to create '%s': %s", filename, strerror(errno));
(error_cb)(&temp, message, error_cbdata);
return (NULL);
}
if ((pdf = create_common(filename, fd, /*output_cb*/NULL, /*output_cbdata*/NULL, version, media_box, crop_box, error_cb, error_cbdata)) == NULL)
{
// Remove the newly created file if we can't create the PDF file object...
close(fd);
unlink(filename);
}
return (pdf);
}
//
// 'pdfioFileCreateArrayObj()' - Create a new object in a PDF file containing an array.
//
// This function creates a new object with an array value in a PDF file.
// You must call @link pdfioObjClose@ to write the object to the file.
//
pdfio_obj_t * // O - New object
pdfioFileCreateArrayObj(
pdfio_file_t *pdf, // I - PDF file
pdfio_array_t *array) // I - Object array
{
_pdfio_value_t value; // Object value
// Range check input...
if (!pdf || !array)
return (NULL);
value.type = PDFIO_VALTYPE_ARRAY;
value.value.array = array;
return (_pdfioFileCreateObj(pdf, array->pdf, &value));
}
//
// 'pdfioFileCreateNumberObj()' - Create a new object in a PDF file containing a number.
//
// This function creates a new object with a number value in a PDF file.
// You must call @link pdfioObjClose@ to write the object to the file.
//
pdfio_obj_t * // O - New object
pdfioFileCreateNumberObj(
pdfio_file_t *pdf, // I - PDF file
double number) // I - Number value
{
_pdfio_value_t value; // Object value
// Range check input...
if (!pdf)
return (NULL);
value.type = PDFIO_VALTYPE_NUMBER;
value.value.number = number;
return (_pdfioFileCreateObj(pdf, NULL, &value));
}
//
// 'pdfioFileCreateObj()' - Create a new object in a PDF file.
//
pdfio_obj_t * // O - New object
pdfioFileCreateObj(
pdfio_file_t *pdf, // I - PDF file
pdfio_dict_t *dict) // I - Object dictionary
{
_pdfio_value_t value; // Object value
// Range check input...
if (!pdf || !dict)
return (NULL);
value.type = PDFIO_VALTYPE_DICT;
value.value.dict = dict;
return (_pdfioFileCreateObj(pdf, dict->pdf, &value));
}
//
// '_pdfioFileCreateObj()' - Create a new object in a PDF file with a value.
//
pdfio_obj_t * // O - New object
_pdfioFileCreateObj(
pdfio_file_t *pdf, // I - PDF file
pdfio_file_t *srcpdf, // I - Source PDF file, if any
_pdfio_value_t *value) // I - Object dictionary
{
pdfio_obj_t *obj; // New object
// Range check input...
if (!pdf)
return (NULL);
if (pdf->mode != _PDFIO_MODE_WRITE)
return (NULL);
// 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;
// Initialize the object...
obj->pdf = pdf;
obj->number = pdf->num_objs;
if (value)
_pdfioValueCopy(pdf, &obj->value, srcpdf, value);
// Don't write anything just yet...
return (obj);
}
//
// 'pdfioFileCreateOutput()' - Create a PDF file through an output callback.
//
// This function creates a new PDF file that is streamed though an output
// callback. The "output_cb" and "output_cbdata" arguments specify the output
// callback and its data pointer which is called whenever data needs to be
// written:
//
// ```
// ssize_t
// output_cb(void *output_cbdata, const void *buffer, size_t bytes)
// {
// // Write buffer to output and return the number of bytes written
// }
// ```
//
// The "version" argument specifies the PDF version number for the file or
// `NULL` for the default ("2.0").
//
// The "media_box" and "crop_box" arguments specify the default MediaBox and
// CropBox for pages in the PDF file - if `NULL` then a default "Universal" size
// of 8.27x11in (the intersection of US Letter and ISO A4) is used.
//
// The "error_cb" and "error_cbdata" arguments specify an error handler callback
// and its data pointer - if `NULL` the default error handler is used that
// writes error messages to `stderr`.
//
// > *Note*: Files created using this API are slightly larger than those
// > created using the @link pdfioFileCreate@ function since stream lengths are
// > stored as indirect object references.
//
pdfio_file_t * // O - PDF file or `NULL` on error
pdfioFileCreateOutput(
pdfio_output_cb_t output_cb, // I - Output callback function
void *output_cbdata, // I - Output callback data
const char *version, // I - PDF version number or `NULL` for default (2.0)
pdfio_rect_t *media_box, // I - Default MediaBox for pages
pdfio_rect_t *crop_box, // I - Default CropBox for pages
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_cbdata) // I - Error callback data, if any
{
PDFIO_DEBUG("pdfioFileCreate(output_cb=%p, output_cbdata=%p, version=\"%s\", media_box=%p, crop_box=%p, error_cb=%p, error_cbdata=%p)\n", (void *)output_cb, (void *)output_cbdata, version, (void *)media_box, (void *)crop_box, (void *)error_cb, (void *)error_cbdata);
return (create_common("output.pdf", /*fd*/-1, output_cb, output_cbdata, version, media_box, crop_box, error_cb, error_cbdata));
}
//
// '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
}
//
// 'pdfioFileCreateStringObj()' - Create a new object in a PDF file containing a string.
//
// This function creates a new object with a string value in a PDF file.
// You must call @link pdfioObjClose@ to write the object to the file.
//
pdfio_obj_t * // O - New object
pdfioFileCreateStringObj(
pdfio_file_t *pdf, // I - PDF file
const char *string) // I - String
{
_pdfio_value_t value; // Object value
// Range check input...
if (!pdf)
return (NULL);
value.type = PDFIO_VALTYPE_STRING;
value.value.string = string;
return (_pdfioFileCreateObj(pdf, NULL, &value));
}
//
// 'pdfioFileCreateTemporary()' - Create a temporary PDF file.
//
// This function creates a PDF file with a unique filename in the current
// temporary directory. The temporary file is stored in the string "buffer" an
// will have a ".pdf" extension. Otherwise, this function works the same as
// the @link pdfioFileCreate@ function.
//
// @since PDFio v1.1@
//
pdfio_file_t *
pdfioFileCreateTemporary(
char *buffer, // I - Filename buffer
size_t bufsize, // I - Size of filename buffer
const char *version, // I - PDF version number or `NULL` for default (2.0)
pdfio_rect_t *media_box, // I - Default MediaBox for pages
pdfio_rect_t *crop_box, // I - Default CropBox for pages
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_cbdata) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
int i, // Looping var
fd; // File descriptor
const char *tmpdir; // Temporary directory
#if _WIN32 || defined(__APPLE__)
char tmppath[256]; // Temporary directory path
#endif // _WIN32 || __APPLE__
unsigned tmpnum; // Temporary filename number
PDFIO_DEBUG("pdfioFileCreate(buffer=%p, bufsize=%lu, version=\"%s\", media_box=%p, crop_box=%p, error_cb=%p, error_cbdata=%p)\n", (void *)buffer, (unsigned long)bufsize, version, (void *)media_box, (void *)crop_box, (void *)error_cb, (void *)error_cbdata);
// Range check input...
if (!buffer || bufsize < 32)
{
if (buffer)
*buffer = '\0';
return (NULL);
}
// Create the temporary PDF file...
#if _WIN32
if ((tmpdir = getenv("TEMP")) == NULL)
{
GetTempPathA(sizeof(tmppath), tmppath);
tmpdir = tmppath;
}
#elif defined(__APPLE__)
if ((tmpdir = getenv("TMPDIR")) != NULL && access(tmpdir, W_OK))
tmpdir = NULL;
if (!tmpdir)
{
// Grab the per-process temporary directory for sandboxed apps...
# ifdef _CS_DARWIN_USER_TEMP_DIR
if (confstr(_CS_DARWIN_USER_TEMP_DIR, tmppath, sizeof(tmppath)))
tmpdir = tmppath;
else
# endif // _CS_DARWIN_USER_TEMP_DIR
tmpdir = "/private/tmp";
}
#else
if ((tmpdir = getenv("TMPDIR")) == NULL || access(tmpdir, W_OK))
tmpdir = "/tmp";
#endif // _WIN32
for (i = 0, fd = -1; i < 1000; i ++)
{
_pdfioCryptoMakeRandom((uint8_t *)&tmpnum, sizeof(tmpnum));
snprintf(buffer, bufsize, "%s/%08x.pdf", tmpdir, tmpnum);
if ((fd = open(buffer, O_WRONLY | O_BINARY | O_CREAT | O_TRUNC | O_EXCL, 0666)) >= 0)
break;
}
if (fd < 0)
{
pdfio_file_t temp; // Dummy file
char message[8192]; // Message string
temp.filename = (char *)"<temporary>";
snprintf(message, sizeof(message), "Unable to create temporary PDF file: %s", strerror(errno));
(error_cb)(&temp, message, error_cbdata);
return (NULL);
}
if ((pdf = create_common(buffer, fd, /*output_cb*/NULL, /*output_cbdata*/NULL, version, media_box, crop_box, error_cb, error_cbdata)) == NULL)
{
// Remove the temporary file if we can't create the PDF file object...
close(fd);
unlink(buffer);
*buffer = '\0';
}
return (pdf);
}
//
// '_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)
{
size_t left, // Left object
right, // Right object
current; // Current object
PDFIO_DEBUG("pdfioFileFindObj(pdf=%p, number=%lu) alloc_objs=%lu, num_objs=%lu, objs=%p\n", (void *)pdf, (unsigned long)number, (unsigned long)(pdf ? pdf->alloc_objs : 0), (unsigned long)(pdf ? pdf->num_objs : 0), (void *)(pdf ? pdf->objs : NULL));
// Range check input...
if (!pdf || pdf->num_objs == 0 || number < 1)
return (NULL);
// Do a binary search for the object...
if ((current = number - 1) >= pdf->num_objs)
current = pdf->num_objs / 2;
PDFIO_DEBUG("pdfioFileFindObj: objs[current=%lu]=%p(%lu)\n", (unsigned long)current, (void *)pdf->objs[current], (unsigned long)(pdf->objs[current] ? pdf->objs[current]->number : 0));
if (number == pdf->objs[current]->number)
{
// Fast match...
PDFIO_DEBUG("pdfioFileFindObj: Returning %lu (%p)\n", (unsigned long)current, pdf->objs[current]);
return (pdf->objs[current]);
}
else if (number < pdf->objs[current]->number)
{
left = 0;
right = current;
}
else
{
left = current;
right = pdf->num_objs - 1;
}
while ((right - left) > 1)
{
current = (left + right) / 2;
if (number == pdf->objs[current]->number)
return (pdf->objs[current]);
else if (number < pdf->objs[current]->number)
right = current;
else
left = current;
}
if (number == pdf->objs[left]->number)
{
PDFIO_DEBUG("pdfioFileFindObj: Returning %lu (%p)\n", (unsigned long)left, pdf->objs[left]);
return (pdf->objs[left]);
}
else if (number == pdf->objs[right]->number)
{
PDFIO_DEBUG("pdfioFileFindObj: Returning %lu (%p)\n", (unsigned long)right, pdf->objs[right]);
return (pdf->objs[right]);
}
else
{
PDFIO_DEBUG("pdfioFileFindObj: Returning NULL\n");
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 (get_info_string(pdf, "Author"));
}
//
// 'pdfioFileGetCatalog()' - Get the document catalog dictionary.
//
// @since PDFio 1.3@
//
pdfio_dict_t * // O - Catalog dictionary
pdfioFileGetCatalog(pdfio_file_t *pdf) // I - PDF file
{
return (pdf ? pdfioObjGetDict(pdf->root_obj) : 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(pdfioObjGetDict(pdf->info_obj), "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 (get_info_string(pdf, "Creator"));
}
//
// '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 (get_info_string(pdf, "Keywords"));
}
//
// '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 (get_info_string(pdf, "Producer"));
}
//
// '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 (get_info_string(pdf, "Subject"));
}
//
// '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 (get_info_string(pdf, "Title"));
}
//
// '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_cbdata" 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_cbdata" 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_cbdata,
// I - Password callback data, if any
pdfio_error_cb_t error_cb, // I - Error callback or `NULL` for default
void *error_cbdata) // I - Error callback data, if any
{
pdfio_file_t *pdf; // PDF file
char line[1025], // Line from file
*ptr, // Pointer into line
*end; // End of line
ssize_t bytes; // Bytes read
off_t xref_offset; // Offset to xref table
PDFIO_DEBUG("pdfioFileOpen(filename=\"%s\", password_cb=%p, password_cbdata=%p, error_cb=%p, error_cbdata=%p)\n", filename, (void *)password_cb, (void *)password_cbdata, (void *)error_cb, (void *)error_cbdata);
// Range check input...
if (!filename)
return (NULL);
if (!error_cb)
{
error_cb = _pdfioFileDefaultError;
error_cbdata = 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_cbdata);
return (NULL);
}
pdf->loc = get_lconv();
pdf->filename = strdup(filename);
pdf->mode = _PDFIO_MODE_READ;
pdf->error_cb = error_cb;
pdf->error_data = error_cbdata;
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);