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128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
//
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// PDF page functions for PDFio.
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//
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// Copyright © 2021-2022 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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//
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// Local functions...
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//
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static _pdfio_value_t *get_contents(pdfio_obj_t *page);
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//
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// 'pdfioPageCopy()' - Copy a page to a PDF file.
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//
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bool // O - `true` on success, `false` on failure
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pdfioPageCopy(pdfio_file_t *pdf, // I - PDF file
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pdfio_obj_t *srcpage) // I - Source page
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{
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pdfio_obj_t *dstpage; // Destination page object
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PDFIO_DEBUG("pdfioPageCopy(pdf=%p, srcpage=%p(%p))\n", pdf, srcpage, srcpage ? srcpage->pdf : NULL);
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// Range check input
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if (!pdf || !srcpage || srcpage->value.type != PDFIO_VALTYPE_DICT)
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{
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if (pdf)
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{
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if (!srcpage)
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_pdfioFileError(pdf, "NULL page object specified.");
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else
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_pdfioFileError(pdf, "Object is not a page.");
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}
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return (false);
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}
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// Copy the page object and add it to the pages array...
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if ((dstpage = pdfioObjCopy(pdf, srcpage)) == NULL)
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return (false);
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else
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return (_pdfioFileAddPage(pdf, dstpage));
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}
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//
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// 'pdfioPageGetNumStreams()' - Get the number of content streams for a page object.
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//
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size_t // O - Number of streams
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pdfioPageGetNumStreams(
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pdfio_obj_t *page) // I - Page object
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{
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_pdfio_value_t *contents = get_contents(page);
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// Contents value
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if (!contents)
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return (0);
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else if (contents->type == PDFIO_VALTYPE_ARRAY)
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return (pdfioArrayGetSize(contents->value.array));
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else
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return (1);
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}
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//
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// 'pdfioPageOpenStream()' - Open a content stream for a page.
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//
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pdfio_stream_t * // O - Stream
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pdfioPageOpenStream(
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pdfio_obj_t *page, // I - Page object
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size_t n, // I - Stream index (0-based)
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bool decode) // I - `true` to decode/decompress stream
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{
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_pdfio_value_t *contents = get_contents(page);
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// Contents value
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if (!contents)
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return (NULL);
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else if (contents->type == PDFIO_VALTYPE_ARRAY && n < pdfioArrayGetSize(contents->value.array))
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return (pdfioObjOpenStream(pdfioArrayGetObj(contents->value.array, n), decode));
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else if (n)
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return (NULL);
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else
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return (pdfioObjOpenStream(pdfioFileFindObj(page->pdf, contents->value.indirect.number), decode));
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}
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//
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// 'get_contents()' - Get a page's Contents value.
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//
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static _pdfio_value_t * // O - Value or NULL on error
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get_contents(pdfio_obj_t *page) // I - Page object
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{
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// Range check input...
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if (!page)
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return (NULL);
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// Load the page object as needed...
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if (page->value.type == PDFIO_VALTYPE_NONE)
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{
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if (!_pdfioObjLoad(page))
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return (NULL);
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}
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if (page->value.type != PDFIO_VALTYPE_DICT)
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return (NULL);
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return (_pdfioDictGetValue(page->value.value.dict, "Contents"));
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}
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