C API: add functions for working with pages (fixes #594)

9 files changed, 955 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index c13f4ecb..16cfd204 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2021-12-16  Jay Berkenbilt  <ejb@ql.org>
+
+	* Add several functions to the C API for working with pages. C
+	wrappers around sevearl of the "Legacy" page operations from
+	QPDFObjectHandle.hh have been added. See "PAGE FUNCTIONS" in
+	qpdf-c.h for details. Fixes #594.
+
 2021-12-12  Jay Berkenbilt  <ejb@ql.org>
 
 	* Convert documentation from docbook to reStructuredText/Sphinx.
diff --git a/include/qpdf/qpdf-c.h b/include/qpdf/qpdf-c.h
index 9d121060..4a6eb3a5 100644
--- a/include/qpdf/qpdf-c.h
+++ b/include/qpdf/qpdf-c.h
@@ -788,6 +788,67 @@ extern "C" {
     char const* qpdf_oh_unparse_resolved(qpdf_data qpdf, qpdf_oh oh);
     QPDF_DLL
     char const* qpdf_oh_unparse_binary(qpdf_data qpdf, qpdf_oh oh);
+
+    /* PAGE FUNCTIONS */
+
+    /* The first time a page function is called, qpdf will traverse
+     * the /Pages tree. Subsequent calls to retrieve the number of
+     * pages or a specific page run in constant time as they are
+     * accessing the pages cache. If you manipulate the page tree
+     * outside of these functions, you should call
+     * qpdf_update_all_pages_cache. See comments for getAllPages() and
+     * updateAllPagesCache() in QPDF.hh.
+     */
+
+    /* For each function, the corresponding method in QPDF.hh is
+     * referenced. Please see comments in QPDF.hh for details.
+     */
+
+    /* calls getAllPages(). On error, returns -1 and sets error for
+     * qpdf_get_error. */
+    QPDF_DLL
+    int qpdf_get_num_pages(qpdf_data qpdf);
+    /* returns uninitialized object if out of range */
+    QPDF_DLL
+    qpdf_oh qpdf_get_page_n(qpdf_data qpdf, size_t zero_based_index);
+
+    /* updateAllPagesCache() */
+    QPDF_DLL
+    QPDF_ERROR_CODE qpdf_update_all_pages_cache(qpdf_data qpdf);
+
+    /* findPage() -- return zero-based index. If page is not found,
+     * return -1 and save the error to be retrieved with
+     * qpdf_get_error.
+     */
+    QPDF_DLL
+    int qpdf_find_page_by_id(qpdf_data qpdf, int objid, int generation);
+    QPDF_DLL
+    int qpdf_find_page_by_oh(qpdf_data qpdf, qpdf_oh oh);
+
+    /* pushInheritedAttributesToPage() */
+    QPDF_DLL
+    QPDF_ERROR_CODE qpdf_push_inherited_attributes_to_page(qpdf_data qpdf);
+
+    /* Functions that add pages may add pages from other files. If
+     * adding a page from the same file, newpage_qpdf and qpdf are the
+     * same.
+     /*/
+
+    /* addPage() */
+    QPDF_DLL
+    QPDF_ERROR_CODE qpdf_add_page(
+        qpdf_data qpdf,
+        qpdf_data newpage_qpdf, qpdf_oh newpage,
+        QPDF_BOOL first);
+    /* addPageAt() */
+    QPDF_DLL
+    QPDF_ERROR_CODE qpdf_add_page_at(
+        qpdf_data qpdf,
+        qpdf_data newpage_qpdf, qpdf_oh newpage,
+        QPDF_BOOL before, qpdf_oh refpage);
+    /* removePage() */
+    QPDF_DLL
+    QPDF_ERROR_CODE qpdf_remove_page(qpdf_data qpdf, qpdf_oh page);
 #ifdef __cplusplus
 }
 #endif
diff --git a/libqpdf/qpdf-c.cc b/libqpdf/qpdf-c.cc
index c4428d10..0ce9c39e 100644
--- a/libqpdf/qpdf-c.cc
+++ b/libqpdf/qpdf-c.cc
@@ -1579,3 +1579,102 @@ char const* qpdf_oh_unparse_binary(qpdf_data qpdf, qpdf_oh oh)
             return qpdf->tmp_string.c_str();
         });
 }
+
+int qpdf_get_num_pages(qpdf_data qpdf)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_num_pages");
+    int n = -1;
+    QPDF_ERROR_CODE code = trap_errors(qpdf, [&n](qpdf_data q) {
+        n = QIntC::to_int(q->qpdf->getAllPages().size());
+    });
+    if (code & QPDF_ERRORS)
+    {
+        return -1;
+    }
+    return n;
+}
+
+qpdf_oh qpdf_get_page_n(qpdf_data qpdf, size_t i)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_get_page_n");
+    qpdf_oh result = 0;
+    QPDF_ERROR_CODE code = trap_errors(qpdf, [&result, i](qpdf_data q) {
+        result = new_object(q, q->qpdf->getAllPages().at(i));
+    });
+    if ((code & QPDF_ERRORS) || (result == 0))
+    {
+        return qpdf_oh_new_uninitialized(qpdf);
+    }
+    return result;
+}
+
+QPDF_ERROR_CODE qpdf_update_all_pages_cache(qpdf_data qpdf)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_update_all_pages_cache");
+    return trap_errors(qpdf, [](qpdf_data q) {
+        q->qpdf->updateAllPagesCache();
+    });
+}
+
+int qpdf_find_page_by_id(qpdf_data qpdf, int objid, int generation)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_find_page_by_id");
+    int n = -1;
+    QPDFObjGen og(objid, generation);
+    QPDF_ERROR_CODE code = trap_errors(qpdf, [&n, &og](qpdf_data q) {
+        n = QIntC::to_int(q->qpdf->findPage(og));
+    });
+    if (code & QPDF_ERRORS)
+    {
+        return -1;
+    }
+    return n;
+}
+
+int qpdf_find_page_by_oh(qpdf_data qpdf, qpdf_oh oh)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_find_page_by_oh");
+    return do_with_oh<int>(
+        qpdf, oh, return_T<int>(-1), [qpdf](QPDFObjectHandle& o) {
+            return qpdf->qpdf->findPage(o);
+        });
+}
+
+QPDF_ERROR_CODE qpdf_push_inherited_attributes_to_page(qpdf_data qpdf)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_push_inherited_attributes_to_page");
+    return trap_errors(qpdf, [](qpdf_data q) {
+        q->qpdf->pushInheritedAttributesToPage();
+    });
+}
+
+QPDF_ERROR_CODE qpdf_add_page(
+    qpdf_data qpdf, qpdf_data newpage_qpdf, qpdf_oh newpage, QPDF_BOOL first)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_add_page");
+    auto page = qpdf_oh_item_internal(newpage_qpdf, newpage);
+    return trap_errors(qpdf, [&page, first](qpdf_data q) {
+        q->qpdf->addPage(page, first);
+    });
+}
+
+QPDF_ERROR_CODE qpdf_add_page_at(
+    qpdf_data qpdf, qpdf_data newpage_qpdf, qpdf_oh newpage,
+    QPDF_BOOL before, qpdf_oh refpage)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_add_page_at");
+    auto page = qpdf_oh_item_internal(newpage_qpdf, newpage);
+    auto ref = qpdf_oh_item_internal(qpdf, refpage);
+    return trap_errors(qpdf, [&page, before, &ref](qpdf_data q) {
+        q->qpdf->addPageAt(page, before, ref);
+    });
+}
+
+QPDF_ERROR_CODE qpdf_remove_page(qpdf_data qpdf, qpdf_oh page)
+{
+    QTC::TC("qpdf", "qpdf-c called qpdf_remove_page");
+    auto p = qpdf_oh_item_internal(qpdf, page);
+    return trap_errors(qpdf, [&p](qpdf_data q) {
+        q->qpdf->removePage(p);
+    });
+}
diff --git a/manual/index.rst b/manual/index.rst
index 8fcb18f9..155d64b0 100644
--- a/manual/index.rst
+++ b/manual/index.rst
@@ -3626,7 +3626,9 @@ For a detailed list of changes, please see the file
       more detail what the behavior is. See :ref:`ref.object-accessors` for a more in-depth
       discussion.
 
-    - Overhaul error handling for the object handle functions in the
+  - C API Enhancements
+
+    - Overhaul error handling for the object handle functions
       C API. See comments in the "Object handling" section of
       :file:`include/qpdf/qpdf-c.h` for details.
       In particular, exceptions thrown by the underlying C++ code
@@ -3650,6 +3652,9 @@ For a detailed list of changes, please see the file
       and ``qpdf_replace_object``, exposing the corresponding methods
       in ``QPDF`` and ``QPDFObjectHandle``.
 
+    - Add several functions for working with pages. See ``PAGE
+      FUNCTIONS`` in ``include/qpdf/qpdf-c.h`` for details.
+
   - Documentation change
 
     - The documentation sources have been switched from docbook to
diff --git a/qpdf/qpdf-ctest.c b/qpdf/qpdf-ctest.c
index 307b57c7..a0819599 100644
--- a/qpdf/qpdf-ctest.c
+++ b/qpdf/qpdf-ctest.c
@@ -931,6 +931,138 @@ static void test33(char const* infile,
     report_errors();
 }
 
+static void test34(char const* infile,
+		   char const* password,
+		   char const* outfile,
+		   char const* xarg)
+{
+    /* This test expects 11-pages.pdf as file1 and minimal.pdf as xarg. */
+
+    /* Non-error cases for page API */
+
+    qpdf_data qpdf2 = qpdf_init();
+    assert(qpdf_read(qpdf, infile, password) == 0);
+    assert(qpdf_read(qpdf2, xarg, "") == 0);
+    assert(qpdf_get_num_pages(qpdf) == 11);
+    assert(qpdf_get_num_pages(qpdf2) == 1);
+
+    /* At this time, there is no C API for accessing stream data, so
+     * we hard-code object IDs from a known input file.
+     */
+    assert(qpdf_oh_get_object_id(qpdf, qpdf_get_page_n(qpdf, 0)) == 4);
+    assert(qpdf_oh_get_object_id(qpdf, qpdf_get_page_n(qpdf, 10)) == 14);
+    qpdf_oh page3 = qpdf_get_page_n(qpdf, 3);
+    assert(qpdf_find_page_by_oh(qpdf, page3) == 3);
+    assert(qpdf_find_page_by_id(
+               qpdf, qpdf_oh_get_object_id(qpdf, page3), 0) == 3);
+
+    /* Add other page to the end */
+    qpdf_oh opage0 = qpdf_get_page_n(qpdf2, 0);
+    assert(qpdf_add_page(qpdf, qpdf2, opage0, QPDF_FALSE) == 0);
+    /* Add other page before page 3 */
+    assert(qpdf_add_page_at(qpdf, qpdf2, opage0, QPDF_TRUE, page3) == 0);
+    /* Remove page 3 */
+    assert(qpdf_remove_page(qpdf, page3) == 0);
+    /* At page 3 back at the beginning */
+    assert(qpdf_add_page(qpdf, qpdf, page3, QPDF_TRUE) == 0);
+
+    qpdf_init_write(qpdf, outfile);
+    qpdf_set_static_ID(qpdf, QPDF_TRUE);
+    qpdf_set_qdf_mode(qpdf, QPDF_TRUE);
+    qpdf_set_suppress_original_object_IDs(qpdf, QPDF_TRUE);
+    qpdf_write(qpdf);
+    report_errors();
+    qpdf_cleanup(&qpdf2);
+}
+
+static void test35(char const* infile,
+		   char const* password,
+		   char const* outfile,
+		   char const* xarg)
+{
+    /* This test uses 11-pages.pdf */
+
+    assert(qpdf_get_num_pages(qpdf) == -1);
+    assert(qpdf_has_error(qpdf));
+    qpdf_error e = qpdf_get_error(qpdf);
+    assert(qpdf_get_error_code(qpdf, e) != QPDF_SUCCESS);
+    assert(! qpdf_has_error(qpdf));
+
+    assert(qpdf_read(qpdf, infile, password) == 0);
+
+    qpdf_oh range = qpdf_get_page_n(qpdf, 11);
+    assert(! qpdf_oh_is_initialized(qpdf, range));
+    assert(qpdf_has_error(qpdf));
+    e = qpdf_get_error(qpdf);
+    assert(qpdf_get_error_code(qpdf, e) != QPDF_SUCCESS);
+    assert(! qpdf_has_error(qpdf));
+
+    assert(qpdf_find_page_by_id(qpdf, 100, 0) == -1);
+    assert(qpdf_has_error(qpdf));
+    e = qpdf_get_error(qpdf);
+    assert(qpdf_get_error_code(qpdf, e) != QPDF_SUCCESS);
+    assert(! qpdf_has_error(qpdf));
+
+    assert(qpdf_find_page_by_oh(qpdf, qpdf_get_root(qpdf)) == -1);
+    assert(qpdf_more_warnings(qpdf));
+    e = qpdf_next_warning(qpdf);
+    assert(qpdf_get_error_code(qpdf, e) != QPDF_SUCCESS);
+    assert(! qpdf_has_error(qpdf));
+
+    assert(qpdf_find_page_by_id(qpdf, 100, 0) == -1);
+    assert(qpdf_has_error(qpdf));
+    e = qpdf_get_error(qpdf);
+    assert(qpdf_get_error_code(qpdf, e) != QPDF_SUCCESS);
+    assert(! qpdf_has_error(qpdf));
+
+    assert(qpdf_add_page(qpdf, qpdf, 1000, QPDF_FALSE) != 0);
+
+    report_errors();
+}
+
+static void test36(char const* infile,
+		   char const* password,
+		   char const* outfile,
+		   char const* xarg)
+{
+    /* This test uses inherited-rotate.pdf */
+
+    assert(qpdf_read(qpdf, infile, password) == 0);
+
+    /* Non-trivially push inherited attributes */
+    qpdf_oh page0 = qpdf_get_object_by_id(qpdf, 3, 0);
+    assert(qpdf_oh_is_dictionary(qpdf, page0));
+    qpdf_oh r = qpdf_oh_get_key(qpdf, page0, "/Rotate");
+    assert(qpdf_oh_get_int_value(qpdf, r) == 90);
+    qpdf_oh_remove_key(qpdf, page0, "/Rotate");
+    assert(! qpdf_oh_has_key(qpdf, page0, "/Rotate"));
+
+    assert(qpdf_push_inherited_attributes_to_page(qpdf) == 0);
+    r = qpdf_oh_get_key(qpdf, page0, "/Rotate");
+    assert(qpdf_oh_get_int_value(qpdf, r) == 270);
+
+    assert(qpdf_add_page(qpdf, qpdf, page0, QPDF_TRUE) == 0);
+}
+
+static void test37(char const* infile,
+		   char const* password,
+		   char const* outfile,
+		   char const* xarg)
+{
+    /* This test uses 11-pages.pdf */
+
+    /* Manually manipulate pages tree */
+    assert(qpdf_read(qpdf, infile, password) == 0);
+    assert(qpdf_get_num_pages(qpdf) == 11);
+    qpdf_oh pages = qpdf_get_object_by_id(qpdf, 3, 0);
+    qpdf_oh kids = qpdf_oh_get_key(qpdf, pages, "/Kids");
+    assert(qpdf_oh_get_array_n_items(qpdf, kids) == 11);
+    qpdf_oh_erase_item(qpdf, kids, 0);
+    assert(qpdf_get_num_pages(qpdf) == 11);
+    assert(qpdf_update_all_pages_cache(qpdf) == 0);
+    assert(qpdf_get_num_pages(qpdf) == 10);
+}
+
 int main(int argc, char* argv[])
 {
     char* p = 0;
@@ -1004,6 +1136,10 @@ int main(int argc, char* argv[])
 	  (n == 31) ? test31 :
 	  (n == 32) ? test32 :
 	  (n == 33) ? test33 :
+	  (n == 34) ? test34 :
+	  (n == 35) ? test35 :
+	  (n == 36) ? test36 :
+	  (n == 37) ? test37 :
 	  0);
 
     if (fn == 0)
diff --git a/qpdf/qpdf.testcov b/qpdf/qpdf.testcov
index 9b4e3cea..315c1200 100644
--- a/qpdf/qpdf.testcov
+++ b/qpdf/qpdf.testcov
@@ -608,3 +608,12 @@ qpdf-c registered oh error handler 0
 qpdf-c cleanup warned about unhandled error 0
 qpdf-c called qpdf_get_object_by_id 0
 qpdf-c called qpdf_replace_object 0
+qpdf-c called qpdf_num_pages 0
+qpdf-c called qpdf_get_page_n 0
+qpdf-c called qpdf_update_all_pages_cache 0
+qpdf-c called qpdf_find_page_by_id 0
+qpdf-c called qpdf_find_page_by_oh 0
+qpdf-c called qpdf_push_inherited_attributes_to_page 0
+qpdf-c called qpdf_add_page 0
+qpdf-c called qpdf_add_page_at 0
+qpdf-c called qpdf_remove_page 0
diff --git a/qpdf/qtest/qpdf.test b/qpdf/qtest/qpdf.test
index d4b3f2a5..c975f2c1 100644
--- a/qpdf/qtest/qpdf.test
+++ b/qpdf/qtest/qpdf.test
@@ -4870,6 +4870,36 @@ $td->runtest("C get object by ID",
 
 show_ntests();
 # ----------
+$td->notify("--- C API Page Functions ---");
+$n_tests += 5;
+
+$td->runtest("C page normal",
+             {$td->COMMAND =>
+                  "qpdf-ctest 34 11-pages.pdf '' a.pdf minimal.pdf"},
+             {$td->STRING => "", $td->EXIT_STATUS => 0},
+             $td->NORMALIZE_NEWLINES);
+$td->runtest("check output",
+	     {$td->FILE => 'a.pdf'},
+	     {$td->FILE => 'c-pages.pdf'});
+
+$td->runtest("C page errors",
+             {$td->COMMAND =>
+                  "qpdf-ctest 35 11-pages.pdf '' ''"},
+             {$td->FILE => "c-page-errors.out", $td->EXIT_STATUS => 0},
+             $td->NORMALIZE_NEWLINES);
+$td->runtest("C inherited page resources",
+             {$td->COMMAND =>
+                  "qpdf-ctest 36 inherited-rotate.pdf '' ''"},
+             {$td->STRING => "", $td->EXIT_STATUS => 0},
+             $td->NORMALIZE_NEWLINES);
+$td->runtest("C pages cache",
+             {$td->COMMAND =>
+                  "qpdf-ctest 37 11-pages.pdf '' ''"},
+             {$td->STRING => "", $td->EXIT_STATUS => 0},
+             $td->NORMALIZE_NEWLINES);
+
+show_ntests();
+# ----------
 $td->notify("--- Content Preservation Tests ---");
 # $n_tests incremented below
 
diff --git a/qpdf/qtest/qpdf/c-page-errors.out b/qpdf/qtest/qpdf/c-page-errors.out
new file mode 100644
index 00000000..36afa406
--- /dev/null
+++ b/qpdf/qtest/qpdf/c-page-errors.out
@@ -0,0 +1,8 @@
+11-pages.pdf (page object: object 1 0): page object not referenced in /Pages tree
+11-pages.pdf (C API object handle 1000): attempted access to unknown object handle
+WARNING: object 27 0: operation for dictionary attempted on object of type null: ignoring key replacement request
+warning: object 27 0: operation for dictionary attempted on object of type null: ignoring key replacement request
+  code: 7
+  file: 
+  pos : 0
+  text: operation for dictionary attempted on object of type null: ignoring key replacement request
diff --git a/qpdf/qtest/qpdf/c-pages.pdf b/qpdf/qtest/qpdf/c-pages.pdf
new file mode 100644
index 00000000..40f9bc56
--- /dev/null
+++ b/qpdf/qtest/qpdf/c-pages.pdf
@@ -0,0 +1,599 @@
+%PDF-1.4
+%¿÷¢þ
+%QDF-1.0
+
+1 0 obj
+<<
+  /Pages 3 0 R
+  /Type /Catalog
+>>
+endobj
+
+2 0 obj
+<<
+  /CreationDate (D:20120721200217)
+  /Producer (Apex PDFWriter)
+>>
+endobj
+
+3 0 obj
+<<
+  /Count 13
+  /Kids [
+    4 0 R
+    5 0 R
+    6 0 R
+    7 0 R
+    8 0 R
+    9 0 R
+    10 0 R
+    11 0 R
+    12 0 R
+    13 0 R
+    14 0 R
+    15 0 R
+    16 0 R
+  ]
+  /Type /Pages
+>>
+endobj
+
+%% Page 1
+4 0 obj
+<<
+  /Contents 17 0 R
+  /MediaBox [
+    0
+    0
+    612
+    792
+  ]
+  /Parent 3 0 R
+  /Resources <<
+    /Font <<
+      /F1 19 0 R
+    >>
+    /ProcSet [
+      /PDF
+      /Text
+    ]
+  >>
+  /Type /Page
+>>
+endobj
+
+%% Page 2
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+>>
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+      /PDF
+      /Text
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