mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-11-19 11:58:24 +01:00
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
//
|
||
// PDF page functions for PDFio.
|
||
//
|
||
// Copyright © 2021-2022 by Michael R Sweet.
|
||
//
|
||
// Licensed under Apache License v2.0. See the file "LICENSE" for more
|
||
// information.
|
||
//
|
||
|
||
//
|
||
// Include necessary headers...
|
||
//
|
||
|
||
#include "pdfio-private.h"
|
||
|
||
|
||
//
|
||
// Local functions...
|
||
//
|
||
|
||
static _pdfio_value_t *get_contents(pdfio_obj_t *page);
|
||
|
||
|
||
//
|
||
// 'pdfioPageCopy()' - Copy a page to a PDF file.
|
||
//
|
||
|
||
bool // O - `true` on success, `false` on failure
|
||
pdfioPageCopy(pdfio_file_t *pdf, // I - PDF file
|
||
pdfio_obj_t *srcpage) // I - Source page
|
||
{
|
||
pdfio_obj_t *dstpage; // Destination page object
|
||
|
||
|
||
PDFIO_DEBUG("pdfioPageCopy(pdf=%p, srcpage=%p(%p))\n", pdf, srcpage, srcpage ? srcpage->pdf : NULL);
|
||
|
||
// Range check input
|
||
if (!pdf || !srcpage || srcpage->value.type != PDFIO_VALTYPE_DICT)
|
||
{
|
||
if (pdf)
|
||
{
|
||
if (!srcpage)
|
||
_pdfioFileError(pdf, "NULL page object specified.");
|
||
else
|
||
_pdfioFileError(pdf, "Object is not a page.");
|
||
}
|
||
|
||
return (false);
|
||
}
|
||
|
||
// Copy the page object and add it to the pages array...
|
||
if ((dstpage = pdfioObjCopy(pdf, srcpage)) == NULL)
|
||
return (false);
|
||
else
|
||
return (_pdfioFileAddPage(pdf, dstpage));
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioPageGetNumStreams()' - Get the number of content streams for a page object.
|
||
//
|
||
|
||
size_t // O - Number of streams
|
||
pdfioPageGetNumStreams(
|
||
pdfio_obj_t *page) // I - Page object
|
||
{
|
||
_pdfio_value_t *contents = get_contents(page);
|
||
// Contents value
|
||
|
||
|
||
if (!contents)
|
||
return (0);
|
||
else if (contents->type == PDFIO_VALTYPE_ARRAY)
|
||
return (pdfioArrayGetSize(contents->value.array));
|
||
else
|
||
return (1);
|
||
}
|
||
|
||
|
||
//
|
||
// 'pdfioPageOpenStream()' - Open a content stream for a page.
|
||
//
|
||
|
||
pdfio_stream_t * // O - Stream
|
||
pdfioPageOpenStream(
|
||
pdfio_obj_t *page, // I - Page object
|
||
size_t n, // I - Stream index (0-based)
|
||
bool decode) // I - `true` to decode/decompress stream
|
||
{
|
||
_pdfio_value_t *contents = get_contents(page);
|
||
// Contents value
|
||
|
||
|
||
if (!contents)
|
||
return (NULL);
|
||
else if (contents->type == PDFIO_VALTYPE_ARRAY && n < pdfioArrayGetSize(contents->value.array))
|
||
return (pdfioObjOpenStream(pdfioArrayGetObj(contents->value.array, n), decode));
|
||
else if (n)
|
||
return (NULL);
|
||
else
|
||
return (pdfioObjOpenStream(pdfioFileFindObj(page->pdf, contents->value.indirect.number), decode));
|
||
}
|
||
|
||
|
||
//
|
||
// 'get_contents()' - Get a page's Contents value.
|
||
//
|
||
|
||
static _pdfio_value_t * // O - Value or NULL on error
|
||
get_contents(pdfio_obj_t *page) // I - Page object
|
||
{
|
||
// Range check input...
|
||
if (!page)
|
||
return (NULL);
|
||
|
||
// Load the page object as needed...
|
||
if (page->value.type == PDFIO_VALTYPE_NONE)
|
||
{
|
||
if (!_pdfioObjLoad(page))
|
||
return (NULL);
|
||
}
|
||
|
||
if (page->value.type != PDFIO_VALTYPE_DICT)
|
||
return (NULL);
|
||
|
||
return (_pdfioDictGetValue(page->value.value.dict, "Contents"));
|
||
}
|