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https://github.com/michaelrsweet/pdfio.git
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Add support for internal hyperlinks.
This commit is contained in:
Michael R Sweet
parent
4baafde74b
commit
294f5e07c5
@ -20,6 +20,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <math.h>
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#ifdef _WIN32
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# include <io.h>
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@ -64,11 +65,28 @@ typedef struct docimage_s // Document image info
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typedef struct doclink_s // Document link info
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{
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const char *url; // Reference URL
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const char *url; // Target URL
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pdfio_rect_t box; // Link box
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} doclink_t;
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#define DOCLINK_MAX 1000 // Maximum number of links/page
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#define DOCLINK_MAX 1000 // Maximum number of links per page
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typedef struct docaction_s // Document action info
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{
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const char *target; // Target name
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pdfio_obj_t *obj; // Link object
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} docaction_t;
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#define DOCACTION_MAX 10000 // Maximum number of actions per document
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typedef struct doctarget_s // Document target info
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{
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char name[128]; // Target name
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size_t page; // Target page
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double y; // Target page position
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} doctarget_t;
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#define DOCTARGET_MAX 1000 // Maximum number of targets per document
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typedef struct docdata_s // Document formatting data
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{
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@ -90,6 +108,10 @@ typedef struct docdata_s // Document formatting data
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pdfio_obj_t *annots_obj; // Annotations object (for links)
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size_t num_links; // Number of links for this page
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doclink_t links[DOCLINK_MAX]; // Links for this page
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size_t num_actions; // Number of actions for this document
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docaction_t actions[DOCACTION_MAX]; // Actions for this document
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size_t num_targets; // Number of targets for this document
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doctarget_t targets[DOCTARGET_MAX]; // Targets for this document
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} docdata_t;
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typedef struct linefrag_s // Line fragment
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@ -211,6 +233,7 @@ static void format_block(docdata_t *dd, mmd_t *block, docfont_t deffont, double
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static void format_code(docdata_t *dd, mmd_t *block, double left, double right);
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static void format_doc(docdata_t *dd, mmd_t *doc, double left, double right);
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static void format_table(docdata_t *dd, mmd_t *table, double left, double right);
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static void make_target_name(char *dst, const char *src, size_t dstsize);
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static double measure_cell(docdata_t *dd, mmd_t *cell, tablecol_t *col);
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static mmd_t *mmd_walk_next(mmd_t *top, mmd_t *node);
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static void new_page(docdata_t *dd);
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@ -219,6 +242,7 @@ static void render_line(docdata_t *dd, double margin_left, double margin_top, do
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static void render_row(docdata_t *dd, size_t num_cols, tablecol_t *cols, tablerow_t *row);
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static void set_color(docdata_t *dd, doccolor_t color);
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static void set_font(docdata_t *dd, docfont_t font, double fsize);
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static void write_actions(docdata_t *dd);
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//
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@ -311,6 +335,7 @@ main(int argc, // I - Number of command-line arguments
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pdfioStreamClose(dd.st);
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add_links(&dd);
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}
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write_actions(&dd);
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pdfioFileClose(dd.pdf);
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mmdFree(doc);
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@ -369,6 +394,88 @@ add_images(docdata_t *dd, // I - Document data
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}
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//
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// 'add_links()' - Add the page links, if any.
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//
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static void
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add_links(docdata_t *dd) // I - Document data
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{
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size_t i; // Looping var
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doclink_t *l; // Current link
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pdfio_dict_t *dict; // Object dictionary
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pdfio_obj_t *aobj, // Annotation object
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*lobj; // Link object
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pdfio_array_t *border; // Border values
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// Add any links we have...
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for (i = 0, l = dd->links; i < dd->num_links; i ++, l ++)
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{
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if (l->url[0] == '#')
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{
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// No remote action...
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aobj = NULL;
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}
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else
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{
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// Create the link action (remote URL)
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dict = pdfioDictCreate(dd->pdf);
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pdfioDictSetName(dict, "S", "URI");
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pdfioDictSetString(dict, "URI", pdfioStringCreate(dd->pdf, l->url));
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aobj = pdfioFileCreateObj(dd->pdf, dict);
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pdfioObjClose(aobj);
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}
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// Create the annotation object pointing to the action...
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dict = pdfioDictCreate(dd->pdf);
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pdfioDictSetName(dict, "Subtype", "Link");
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pdfioDictSetRect(dict, "Rect", &l->box);
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border = pdfioArrayCreate(dd->pdf);
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pdfioArrayAppendNumber(border, 0.0);
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pdfioArrayAppendNumber(border, 0.0);
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pdfioArrayAppendNumber(border, 0.0);
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pdfioDictSetArray(dict, "Border", border);
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lobj = pdfioFileCreateObj(dd->pdf, dict);
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if (l->url[0] == '#' && dd->num_actions < DOCACTION_MAX)
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{
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// Save this link action for later...
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docaction_t *a = dd->actions + dd->num_actions;
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// New action
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a->target = l->url + 1;
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a->obj = lobj;
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dd->num_actions ++;
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}
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else if (aobj)
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{
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// Close out this link since we have a remote URL...
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pdfioDictSetObj(dict, "A", aobj);
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pdfioObjClose(lobj);
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}
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else
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{
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// Nothing that can be done for this one...
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pdfioObjClose(lobj);
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}
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pdfioArrayAppendObj(dd->annots_array, lobj);
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}
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// Close the Annots array object...
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pdfioObjClose(dd->annots_obj);
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// Reset links...
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dd->annots_array = NULL;
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dd->annots_obj = NULL;
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dd->num_links = 0;
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}
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//
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// 'find_image()' - Find an image in the document.
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//
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@ -401,59 +508,6 @@ find_image(docdata_t *dd, // I - Document data
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}
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//
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// 'add_links()' - Add the page links, if any.
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//
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static void
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add_links(docdata_t *dd) // I - Document data
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{
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size_t i; // Looping var
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doclink_t *l; // Current link
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pdfio_dict_t *dict; // Object dictionary
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pdfio_obj_t *aobj, // Annotation object
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*lobj; // Link object
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pdfio_array_t *border; // Border values
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// Add any links we have...
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for (i = 0, l = dd->links; i < dd->num_links; i ++, l ++)
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{
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// Create the link action (remote URL)
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dict = pdfioDictCreate(dd->pdf);
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pdfioDictSetName(dict, "S", "URI");
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pdfioDictSetString(dict, "URI", pdfioStringCreate(dd->pdf, l->url));
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aobj = pdfioFileCreateObj(dd->pdf, dict);
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pdfioObjClose(aobj);
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// Create the annotation object pointing to the action...
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dict = pdfioDictCreate(dd->pdf);
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pdfioDictSetName(dict, "Subtype", "Link");
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pdfioDictSetRect(dict, "Rect", &l->box);
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border = pdfioArrayCreate(dd->pdf);
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pdfioArrayAppendNumber(border, 0.0);
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pdfioArrayAppendNumber(border, 0.0);
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pdfioArrayAppendNumber(border, 0.0);
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pdfioDictSetArray(dict, "Border", border);
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pdfioDictSetObj(dict, "A", aobj);
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lobj = pdfioFileCreateObj(dd->pdf, dict);
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pdfioObjClose(lobj);
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pdfioArrayAppendObj(dd->annots_array, lobj);
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}
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// Close the Annots array object...
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pdfioObjClose(dd->annots_obj);
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// Reset links...
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dd->annots_array = NULL;
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dd->annots_obj = NULL;
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dd->num_links = 0;
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}
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//
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// 'format_block()' - Format a block of text
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//
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@ -804,6 +858,18 @@ format_doc(docdata_t *dd, // I - Document data
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dd->heading = mmdCopyAllText(current);
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format_block(dd, current, DOCFONT_BOLD, heading_sizes[curtype - MMD_TYPE_HEADING_1], left, right, /*leader*/NULL);
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if (dd->num_targets < DOCTARGET_MAX)
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{
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doctarget_t *t = dd->targets + dd->num_targets;
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// New target
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make_target_name(t->name, dd->heading, sizeof(t->name));
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t->page = pdfioFileGetNumPages(dd->pdf) - 1;
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t->y = dd->y + heading_sizes[curtype - MMD_TYPE_HEADING_1] * LINE_HEIGHT;
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dd->num_targets ++;
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}
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break;
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case MMD_TYPE_PARAGRAPH :
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@ -956,6 +1022,33 @@ format_table(docdata_t *dd, // I - Document data
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}
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//
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// 'make_target_name()' - Convert text to a target name.
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//
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static void
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make_target_name(char *dst, // I - Destination buffer
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const char *src, // I - Source text
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size_t dstsize) // I - Size of destination buffer
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{
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char *dstptr = dst, // Pointer into destination
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*dstend = dst + dstsize - 1; // End of destination
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while (*src && dstptr < dstend)
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{
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if (isalnum(*src) || *src == '.' || *src == '-')
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*dstptr++ = tolower(*src);
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else if (*src == ' ')
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*dstptr++ = '-';
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src ++;
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}
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*dstptr = '\0';
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}
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//
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// 'measure_cell()' - Measure the dimensions of a table cell.
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//
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@ -1261,7 +1354,10 @@ render_line(docdata_t *dd, // I - Document data
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if (!dd->st)
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{
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new_page(dd);
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margin_top = 0.0;
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}
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dd->y -= margin_top + lineheight;
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if (dd->y < dd->art_box.y1)
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@ -1318,12 +1414,32 @@ render_line(docdata_t *dd, // I - Document data
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else
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pdfioContentTextShow(dd->st, UNICODE_VALUE, frag->text);
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if (frag->type == MMD_TYPE_LINKED_TEXT && frag->url && dd->num_links < DOCLINK_MAX && (!strncmp(frag->url, "http://", 7) || !strncmp(frag->url, "https://", 8)))
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if (frag->type == MMD_TYPE_LINKED_TEXT && frag->url && dd->num_links < DOCLINK_MAX)
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{
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doclink_t *l = dd->links + dd->num_links;
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// Pointer to this link record
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l->url = frag->url;
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if (!strcmp(frag->url, "@"))
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{
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// Use mapped text as link target...
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char targetlink[129]; // Targeted link
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targetlink[0] = '#';
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make_target_name(targetlink + 1, frag->text, sizeof(targetlink) - 1);
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l->url = pdfioStringCreate(dd->pdf, targetlink);
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}
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else if (!strcmp(frag->url, "@@"))
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{
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// Use literal text as anchor...
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l->url = pdfioStringCreatef(dd->pdf, "#%s", frag->text);
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}
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else
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{
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// Use URL as-is...
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l->url = frag->url;
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}
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l->box.x1 = frag->x;
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l->box.y1 = dd->y;
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l->box.x2 = frag->x + frag->width;
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@ -1474,3 +1590,42 @@ set_font(docdata_t *dd, // I - Document data
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dd->font = font;
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dd->fsize = fsize;
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}
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//
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// 'write_actions()' - Write remaining actions to the PDF file.
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//
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static void
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write_actions(docdata_t *dd) // I - Document data
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{
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size_t i, j; // Looping vars
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docaction_t *a; // Current action
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doctarget_t *t; // Current target
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for (i = 0, a = dd->actions; i < dd->num_actions; i ++, a ++)
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{
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for (j = 0, t = dd->targets; j < dd->num_targets; j ++, t ++)
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{
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if (!strcmp(a->target, t->name))
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break;
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}
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if (j < dd->num_targets)
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{
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pdfio_array_t *dest = pdfioArrayCreate(dd->pdf);
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// Destination array
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pdfioArrayAppendObj(dest, pdfioFileGetPage(dd->pdf, t->page));
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pdfioArrayAppendName(dest, "XYZ");
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pdfioArrayAppendNumber(dest, PAGE_LEFT);
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pdfioArrayAppendNumber(dest, t->y);
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pdfioArrayAppendNumber(dest, 0.0);
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pdfioDictSetArray(pdfioObjGetDict(a->obj), "Dest", dest);
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}
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pdfioObjClose(a->obj);
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}
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}
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@ -12,7 +12,7 @@ pages in a PDF file. It demonstrates how to:
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- Format text,
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- Embed JPEG and PNG images,
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- Add headers and footers, and
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- (Future) Add hyperlinks.
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- Add hyperlinks.
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Source Files
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@ -544,7 +544,7 @@ mmdLoadIO(mmd_t *root, // I - Root node for document or `NULL` for a new d
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block = NULL;
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continue;
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}
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else if (*lineptr == '>' && (lineptr - linestart) < 4)
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else if (stackptr->parent->type != MMD_TYPE_CODE_BLOCK && *lineptr == '>' && (lineptr - linestart) < 4)
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{
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// Block quote. See if there is an existing blockquote...
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DEBUG_printf(" BLOCKQUOTE (stackptr=%ld)\n", stackptr - stack);
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