Squashed commit of the following:

// It started as branch for adding UTF-8 support, but ended differently

commit 3615313dcba1e70a7fec91df1c2f022a99bfd09a
Author: Tomáš Stefan <ts@stdin.cz>
Date:   Sat Mar 10 21:06:23 2018 +0100

    read all xref sections

    add fn parse_word and replace with it other specific ones
    store all xref entries for one object (different generation number)
    add fn skip_array

commit 98ecb7ab1cf17465e295d47b1bb2f12d62c28d78
Author: Tomáš Stefan <ts@stdin.cz>
Date:   Thu Mar 8 17:11:18 2018 +0100

    CMake improvements, Build instructions

commit f85f88dbee46453b6475269274734998e85e470d
Author: Tomáš Stefan <ts@stdin.cz>
Date:   Wed Mar 7 16:56:02 2018 +0100

    Minor corrections

    - add missing semicolon on WIN
    - no colour on platforms other than unix
    - signed/unsigned comparison corrections
    - processing fread in loop

commit 2513508e6397af93d0d89783e56744105ef7546a
Author: Tomáš Stefan <ts@stdin.cz>
Date:   Wed Mar 7 14:36:15 2018 +0100

    working on Windows support

commit 05fdbc0c01a25af0c357659504a42dbb5c2b85c9
Author: Tomáš Stefan <ts@stdin.cz>
Date:   Wed Mar 7 00:24:58 2018 +0100

    UTF-8 paths, CMake support

    utf-8 path support
    CMake support
    open file on Windows - work in progress

commit 7e8f520d0b269eb566a6187ab0f2bd64a4b04925
Author: Tomáš Stefan <ts@stdin.cz>
Date:   Tue Mar 6 17:28:08 2018 +0100

    remove char_t, using UTF-8 narrow strings

.gitignore

@@ -59,3 +59,6 @@ Module.symvers
 Mkfile.old
 dkms.conf
 
+# Editor files
+.idea
+cmake-build-debug

CMakeLists.txt

+cmake_minimum_required(VERSION 3.9)
+project(pdf_sigil)
+
+set(CMAKE_C_STANDARD 11)
+set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -pedantic")
+
+# header files
+include_directories(include)
+
+
+file(GLOB LIB_SRC "lib/*.c")
+set (TEST_SRC "test/test.c")
+
+# build both static and shared library
+add_library(pdf-sigil_static STATIC ${LIB_SRC})
+add_library(pdf-sigil_shared SHARED ${LIB_SRC})
+
+# build selftest executable
+add_executable(selftest ${TEST_SRC})
+target_link_libraries(selftest pdf-sigil_static)
+
+# running selftest
+add_custom_target(run_tests ALL
+    COMMAND selftest
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+add_custom_target(run_tests_verbose
+    COMMAND selftest --verbose
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+add_custom_target(run_tests_quiet
+    COMMAND selftest --quiet
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+)
\ No newline at end of file

README.md

@@ -4,3 +4,21 @@ pdf-sigil
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 Word **sigil** in name stands for latin word *sigillum*, which means **seal** or **stamp**.
+
+### Build
+
+Performs build with output into "build" directory. After those steps, there will be a **static and shared library** and also **selftest executable**.
+
+```shell
+cmake -E make_directory build
+cmake -E chdir build cmake ..
+cmake -E chdir build make
+```
+
+The selftest is run automatically during the make, but if you want to re-run it, use one of the following commands:
+
+```shell
+cmake -E chdir build make run_tests # producing default output level
+cmake -E chdir build make run_tests_verbose # verbose output level
+cmake -E chdir build make run_tests_quiet # without output
+```

include/auxiliary.h

@@ -11,8 +11,8 @@
 // Shouldn't be optimized out by the compiler
 void sigil_zeroize(void *a, size_t bytes);
 
-int is_digit(const char_t c);
-int is_whitespace(const char_t c);
+int is_digit(const char c);
+int is_whitespace(const char c);
 
 sigil_err_t pdf_read(sigil_t *sgl, size_t size, char *result, size_t *res_size);
 sigil_err_t pdf_get_char(sigil_t *sgl, char *result);
@@ -22,12 +22,12 @@ sigil_err_t pdf_move_pos_rel(sigil_t *sgl, ssize_t shift_bytes);
 sigil_err_t pdf_move_pos_abs(sigil_t *sgl, size_t position);
 
 sigil_err_t skip_leading_whitespaces(sigil_t *sgl);
+sigil_err_t skip_array(sigil_t *sgl);
 sigil_err_t skip_dictionary(sigil_t *sgl);
 sigil_err_t skip_dict_unknown_value(sigil_t *sgl);
 
 sigil_err_t parse_number(sigil_t *sgl, size_t *number);
-sigil_err_t parse_keyword(sigil_t *sgl, keyword_t *keyword);
-sigil_err_t parse_free_indicator(sigil_t *sgl, free_indicator_t *result);
+sigil_err_t parse_word(sigil_t *sgl, const char *word);
 sigil_err_t parse_indirect_reference(sigil_t *sgl, reference_t *ref);
 sigil_err_t parse_dict_key(sigil_t *sgl, dict_key_t *dict_key);
 

include/config.h

@@ -14,6 +14,10 @@
 // threshold in bytes for loading whole file into buffer
 #define THRESHOLD_FILE_BUFFERING    10485760
 
+// maximum number of file updates, preventing forever loop in processing
+// previous cross-reference sections (caused by cyclic links)
+#define MAX_FILE_UPDATES            1024
+
 // validate values
 int sigil_config_self_test(int verbosity);
 

include/constants.h

@@ -2,21 +2,21 @@
 #define PDF_SIGIL_CONSTANTS_H
 
 
-#define COLOR_RED          "\x1b[31m"
-#define COLOR_GREEN        "\x1b[32m"
-#define COLOR_RESET        "\x1b[0m"
+#ifdef __unix__
+    #define COLOR_RED          "\x1b[31m"
+    #define COLOR_GREEN        "\x1b[32m"
+    #define COLOR_RESET        "\x1b[0m"
+#else
+    #define COLOR_RED          ""
+    #define COLOR_GREEN        ""
+    #define COLOR_RESET        ""
+#endif
 
-#define KEYWORD_UNSET      0
-#define KEYWORD_xref       1
-#define KEYWORD_trailer    2
 
 #define XREF_TYPE_UNSET    0
 #define XREF_TYPE_TABLE    1
 #define XREF_TYPE_STREAM   2
 
-#define IN_USE_ENTRY       0
-#define FREE_ENTRY         1
-
 #define DICT_KEY_UNKNOWN   0
 #define DICT_KEY_Size      1
 #define DICT_KEY_Prev      2

include/types.h

@@ -2,16 +2,18 @@
 #define PDF_SIGIL_TYPES_H
 
 #include <stdint.h> // uint32_t
+#include <stdio.h>
 
 
-typedef unsigned char char_t;
+#ifdef _WIN32
+    #include <BaseTsd.h>
+    typedef SSIZE_T ssize_t;
+#endif
 
 typedef uint32_t sigil_err_t;
 
 typedef uint32_t keyword_t;
 
-typedef uint32_t free_indicator_t;
-
 typedef uint32_t dict_key_t;
 
 typedef struct {
@@ -19,9 +21,10 @@ typedef struct {
     size_t generation_num;
 } reference_t;
 
-typedef struct {
+typedef struct xref_entry_t {
     size_t byte_offset;
     size_t generation_num;
+    struct xref_entry_t *next;
 } xref_entry_t;
 
 typedef struct {

lib/config.c

@@ -44,5 +44,6 @@ int sigil_config_self_test(int verbosity)
 failed:
     print_test_result(0, verbosity);
     print_module_result(0, verbosity);
+
     return 1;
 }

lib/header.c

@@ -15,19 +15,13 @@ sigil_err_t process_header(sigil_t *sgl)
     size_t read_size;
     size_t pdf_x, pdf_y;
 
-
     if (sgl == NULL)
         return ERR_PARAMETER;
 
-    err = pdf_move_pos_abs(sgl, 0);
-    if (err != ERR_NO)
-        return err;
-
-    offset = 0;
-
-    while(1) {
-        if (offset > HEADER_SEARCH_OFFSET)
-            return ERR_PDF_CONTENT;
+    for (offset = 0; offset < HEADER_SEARCH_OFFSET; offset++) {
+        err = pdf_move_pos_abs(sgl, offset);
+        if (err != ERR_NO)
+            return err;
 
         err = pdf_read(sgl, 5, tmp, &read_size);
         if (err != ERR_NO)
@@ -35,35 +29,32 @@ sigil_err_t process_header(sigil_t *sgl)
         if (read_size != 5)
             return ERR_PDF_CONTENT;
 
-        if (strncmp(tmp, "\x25PDF-", 5) == 0) {
-            if ((err = parse_number(sgl, &pdf_x)) != ERR_NO)
-                return err;
+        if (strncmp(tmp, "\x25PDF-", 5) != 0)
+            continue;
 
-            if ((err = pdf_get_char(sgl, &c)) != ERR_NO)
-                return err;
-            if (c != '.')
-                return ERR_PDF_CONTENT;
-
-            if ((err = parse_number(sgl, &pdf_y)) != ERR_NO)
-                return err;
+        if ((err = parse_number(sgl, &pdf_x)) != ERR_NO)
+            return err;
 
-            if ((pdf_x == 1 && pdf_y >= 0 && pdf_y <= 7) ||
-                (pdf_x == 2 && pdf_y == 0))
-            {
-                sgl->pdf_x = pdf_x;
-                sgl->pdf_y = pdf_y;
-            } else {
-                return ERR_PDF_CONTENT;
-            }
+        if ((err = pdf_get_char(sgl, &c)) != ERR_NO)
+            return err;
+        if (c != '.')
+            return ERR_PDF_CONTENT;
 
-            sgl->pdf_start_offset = offset;
+        if ((err = parse_number(sgl, &pdf_y)) != ERR_NO)
+            return err;
 
-            return ERR_NO;
+        if ((pdf_x == 1 && pdf_y >= 0 && pdf_y <= 7) ||
+            (pdf_x == 2 && pdf_y == 0))
+        {
+            sgl->pdf_x = (short)pdf_x;
+            sgl->pdf_y = (short)pdf_y;
+        } else {
+            return ERR_PDF_CONTENT;
         }
 
-        if ((err = pdf_move_pos_rel(sgl, -4)) != ERR_NO)
-            return err;
-        offset++;
+        sgl->pdf_start_offset = offset;
+
+        return ERR_NO;
     }
 
     return ERR_PDF_CONTENT;

lib/sigil.c

 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "auxiliary.h"
 #include "config.h"
 #include "constants.h"
@@ -40,7 +41,8 @@ sigil_err_t sigil_init(sigil_t **sgl)
 
 sigil_err_t sigil_set_pdf_file(sigil_t *sgl, FILE *pdf_file)
 {
-    size_t processed = 0;
+    size_t processed,
+           total_processed;
     char *content = NULL;
 
     if (sgl == NULL || pdf_file == NULL)
@@ -57,7 +59,7 @@ sigil_err_t sigil_set_pdf_file(sigil_t *sgl, FILE *pdf_file)
         return ERR_IO;
 
     // - 2) read current position
-    sgl->pdf_data.size = ftell(sgl->pdf_data.file);
+    sgl->pdf_data.size = (size_t)(ftell(sgl->pdf_data.file) - 1);
     if (sgl->pdf_data.size < 0)
         return ERR_IO;
 
@@ -72,14 +74,28 @@ sigil_err_t sigil_set_pdf_file(sigil_t *sgl, FILE *pdf_file)
             return ERR_NO;
         }
 
-        processed = fread(content, sgl->pdf_data.size,
-                          sizeof(char), sgl->pdf_data.file);
-        if (processed != sgl->pdf_data.size) {
+        total_processed = 0;
+
+        while (total_processed * sizeof(char) < sgl->pdf_data.size) {
+            processed = fread(content + total_processed, sizeof(char),
+                              sgl->pdf_data.size, sgl->pdf_data.file);
+            total_processed += processed;
+            if (processed <= 0 ||
+                total_processed * sizeof(char) > sgl->pdf_data.size)
+            {
+                // fallback to using the file
+                free(content);
+                return ERR_NO;
+            }
+        }
+
+        if (total_processed * sizeof(char) != sgl->pdf_data.size) {
             // fallback to using the file
             free(content);
             return ERR_NO;
         }
-        content[processed] = '\0';
+
+        content[total_processed] = '\0';
 
         sgl->pdf_data.buffer = content;
         sgl->pdf_data.deallocation_info |= DEALLOCATE_BUFFER;
@@ -95,8 +111,39 @@ sigil_err_t sigil_set_pdf_path(sigil_t *sgl, const char *path_to_pdf)
 
     FILE *pdf_file = NULL;
 
-    if ((pdf_file = fopen(path_to_pdf, "r")) == NULL)
-        return ERR_IO;
+    #ifdef _WIN32
+        // convert path to wchar_t
+        size_t out_size;
+        size_t path_len;
+        wchar_t *path_to_pdf_win;
+
+        path_len = strlen(path_to_pdf) + 1;
+        path_to_pdf_win = malloc(path_len * sizeof(wchar_t));
+        if (path_to_pdf_win == NULL)
+            return ERR_ALLOCATION;
+        sigil_zeroize(path_to_pdf_win, path_len * sizeof(wchar_t));
+        if (mbstowcs_s(&out_size,       // out ... characters converted
+                       path_to_pdf_win, // out ... converted string
+                       path_len,        // in  ... size of path_to_pdf_win
+                       path_to_pdf,     // in  ... input string
+                       path_len - 1     // in  ... max wide chars to store
+           ) != 0)
+        {
+            free(path_to_pdf_win);
+            return ERR_IO;
+        }
+
+        if (_wfopen_s(&pdf_file, path_to_pdf_win, L"rb") != 0) {
+            free(path_to_pdf_win);
+            return ERR_IO;
+        }
+
+        free(path_to_pdf_win);
+    #else
+        if ((pdf_file = fopen(path_to_pdf, "rb")) == NULL)
+            return ERR_IO;
+    #endif
+
     sgl->pdf_data.deallocation_info |= DEALLOCATE_FILE;
 
     return sigil_set_pdf_file(sgl, pdf_file);
@@ -126,14 +173,37 @@ sigil_err_t sigil_verify(sigil_t *sgl)
     if (err != ERR_NO)
         return err;
 
-    // process cross-reference section
-    err = process_xref(sgl);
+    // determine offset to the first cross-reference section
+    err = read_startxref(sgl);
     if (err != ERR_NO)
         return err;
 
-    err = process_trailer(sgl);
-    if (err != ERR_NO)
-        return err;
+    if (sgl->xref != NULL)
+        xref_free(sgl->xref);
+    sgl->xref = xref_init();
+    if (sgl->xref == NULL)
+        return ERR_ALLOCATION;
+
+    sgl->xref->prev_section = sgl->startxref;
+
+    size_t max_file_updates = MAX_FILE_UPDATES;
+
+    while (sgl->xref->prev_section > 0 && (max_file_updates--) > 0) {
+        // go to the position of the beginning of next cross-reference section
+        err = pdf_move_pos_abs(sgl, sgl->xref->prev_section);
+        if (err != ERR_NO)
+            return err;
+
+        sgl->xref->prev_section = 0;
+
+        err = process_xref(sgl);
+        if (err != ERR_NO)
+            return err;
+
+        err = process_trailer(sgl);
+        if (err != ERR_NO)
+            return err;
+    }
 
     // TODO
 
@@ -186,15 +256,16 @@ int sigil_sigil_self_test(int verbosity)
     print_test_item("fn sigil_verify", verbosity);
 
     {
-        sgl = NULL;
-        err = sigil_init(&sgl);
-        if (err != ERR_NO || sgl == NULL)
+        sgl = test_prepare_sgl_path(
+                "test/uznavany_bez_razitka_bez_revinfo_27_2_2012_CMS.pdf");
+        if (sgl == NULL)
             goto failed;
 
-        // TODO
-        if (1)
+        if (sigil_verify(sgl) != ERR_NO || 1)
             goto failed;
 
+        // TODO test verification result
+
         sigil_free(&sgl);
     }
 
@@ -202,6 +273,7 @@ int sigil_sigil_self_test(int verbosity)
 
     // all tests done
     print_module_result(1, verbosity);
+
     return 0;
 
 failed:
@@ -210,5 +282,6 @@ failed:
 
     print_test_result(0, verbosity);
     print_module_result(0, verbosity);
+
     return 1;
 }

lib/trailer.c

+#include <stdio.h>
 #include "auxiliary.h"
 #include "constants.h"
 #include "trailer.h"
@@ -5,32 +6,27 @@
 sigil_err_t process_trailer(sigil_t *sgl)
 {
     sigil_err_t err;
-    keyword_t keyword;
     dict_key_t dict_key;
-    char c;
 
     if (sgl == NULL)
         return ERR_PARAMETER;
 
-    // read "trailer"
-    err = parse_keyword(sgl, &keyword);
+    err = parse_word(sgl, "trailer");
     if (err != ERR_NO)
         return err;
-    if (keyword != KEYWORD_trailer)
-        return ERR_PDF_CONTENT;
 
-    err = skip_leading_whitespaces(sgl);
+    err = parse_word(sgl, "<<");
     if (err != ERR_NO)
         return err;
-    if ((pdf_get_char(sgl, &c)) != ERR_NO || c != '<')
-        return ERR_PDF_CONTENT;
-    if ((pdf_get_char(sgl, &c)) != ERR_NO || c != '<')
-        return ERR_PDF_CONTENT;
 
     while ((err = parse_dict_key(sgl, &dict_key)) == ERR_NO) {
         switch (dict_key) {
             case DICT_KEY_Size:
-                err = parse_number(sgl, &(sgl->xref->size_from_trailer));
+                if (sgl->xref->size_from_trailer > 0) {
+                    err = skip_dict_unknown_value(sgl);
+                } else {
+                    err = parse_number(sgl, &(sgl->xref->size_from_trailer));
+                }
                 if (err != ERR_NO)
                     return err;
                 break;
@@ -40,7 +36,13 @@ sigil_err_t process_trailer(sigil_t *sgl)
                     return err;
                 break;
             case DICT_KEY_Root:
-                err = parse_indirect_reference(sgl, &(sgl->ref_catalog_dict));
+                if (sgl->ref_catalog_dict.object_num > 0 ||
+                    sgl->ref_catalog_dict.generation_num > 0)
+                {
+                    err = skip_dict_unknown_value(sgl);
+                } else {
+                    err = parse_indirect_reference(sgl, &(sgl->ref_catalog_dict));
+                }
                 if (err != ERR_NO)
                     return err;
                 break;
@@ -54,6 +56,9 @@ sigil_err_t process_trailer(sigil_t *sgl)
         }
     }
 
+    if (err == ERR_END_OF_DICT)
+        return ERR_NO;
+
     return err;
 }
 
@@ -73,10 +78,12 @@ int sigil_trailer_self_test(int verbosity)
 
     // all tests done
     print_module_result(1, verbosity);
+
     return 0;
 
 failed:
     print_test_result(0, verbosity);
     print_module_result(0, verbosity);
+
     return 1;
 }

lib/xref.c

@@ -12,10 +12,6 @@ static sigil_err_t determine_xref_type(sigil_t *sgl)
     sigil_err_t err;
     char c;
 
-    err = pdf_move_pos_abs(sgl, sgl->startxref);
-    if (err != ERR_NO)
-        return err;
-
     if ((err = pdf_peek_char(sgl, &c)) != ERR_NO)
         return err;
 
@@ -51,30 +47,32 @@ add_xref_entry(xref_t *xref, size_t obj, size_t offset, size_t generation)
         xref->capacity *= resize_factor;
     }
 
-    if (xref->entry[obj] != NULL) {
-        if (xref->entry[obj]->generation_num < generation) {
-            xref->entry[obj]->byte_offset = offset;
-            xref->entry[obj]->generation_num = generation;
-        } else {
+    xref_entry_t **xref_entry = &(xref->entry[obj]);
+
+    while (*xref_entry != NULL) {
+        if ((*xref_entry)->generation_num == generation)
             return ERR_NO;
-        }
-    } else {
-        xref->entry[obj] = malloc(sizeof(xref_entry_t));
-        if (xref->entry[obj] == NULL)
-            return ERR_ALLOCATION;
-        sigil_zeroize(xref->entry[obj], sizeof(xref->entry[obj]));
 
-        xref->entry[obj]->byte_offset = offset;
-        xref->entry[obj]->generation_num = generation;
+        xref_entry = &(*xref_entry)->next;
     }
 
-    return ERR_ALLOCATION;
+    *xref_entry = malloc(sizeof(xref_entry_t));
+    if (*xref_entry == NULL)
+        return ERR_ALLOCATION;
+    sigil_zeroize(*xref_entry, sizeof(xref_entry_t));
+
+    (*xref_entry)->byte_offset = offset;
+    (*xref_entry)->generation_num = generation;
+
+    return ERR_NO;
 }
 
 static void free_xref_entry(xref_entry_t *entry)
 {
-    if (entry != NULL)
+    if (entry != NULL) {
+        free_xref_entry(entry->next);
         free(entry);
+    }
 }
 
 xref_t *xref_init()
@@ -82,14 +80,14 @@ xref_t *xref_init()
     xref_t *xref = malloc(sizeof(xref_t));
     if (xref == NULL)
         return NULL;
-    sigil_zeroize(xref, sizeof(xref));
+    sigil_zeroize(xref, sizeof(*xref));
 
     xref->entry = malloc(sizeof(xref_entry_t *) * XREF_PREALLOCATION);
     if (xref->entry == NULL) {
         free(xref);
         return NULL;
     }
-    sigil_zeroize(xref->entry, sizeof(*(xref->entry)) * xref->capacity);
+    sigil_zeroize(xref->entry, sizeof(*(xref->entry)) * XREF_PREALLOCATION);
     xref->capacity = XREF_PREALLOCATION;
     xref->size_from_trailer = 0;
     xref->prev_section = 0;
@@ -103,7 +101,7 @@ void xref_free(xref_t *xref)
         return;
 
     if (xref->entry != NULL) {
-        for (int i = 0; i < xref->capacity; i++) {
+        for (size_t i = 0; i < xref->capacity; i++) {
             free_xref_entry(xref->entry[i]);
         }
         free(xref->entry);
@@ -159,29 +157,21 @@ sigil_err_t read_startxref(sigil_t *sgl)
 
 sigil_err_t read_xref_table(sigil_t *sgl)
 {
-    free_indicator_t free_indicator;
     size_t section_start = 0,
            section_cnt = 0,
            obj_offset,
            obj_generation;
     int xref_end = 0;
-    keyword_t keyword;
     sigil_err_t err;
 
-    if (sgl->xref == NULL)
+    if (sgl->xref == NULL) {
         sgl->xref = xref_init();
-    if (sgl->xref == NULL)
-        return ERR_ALLOCATION;
-
-    err = pdf_move_pos_abs(sgl, sgl->startxref);
-    if (err != ERR_NO)
-        return err;
+        if (sgl->xref == NULL)
+            return ERR_ALLOCATION;
+    }
 
-    // read "xref"
-    if ((err = parse_keyword(sgl, &keyword)) != ERR_NO)
+    if ((err = parse_word(sgl, "xref")) != ERR_NO)
         return err;
-    if (keyword != KEYWORD_xref)
-        return ERR_PDF_CONTENT;
 
     while (!xref_end) { // for all xref sections
         while (1) {
@@ -198,21 +188,26 @@ sigil_err_t read_xref_table(sigil_t *sgl)
                 return 1;
 
             // for all entries in one section
-            for (int section_offset = 0; section_offset < section_cnt; section_offset++) {
+            for (size_t section_offset = 0; section_offset < section_cnt; section_offset++) {
                 err = parse_number(sgl, &obj_offset);
                 if (err != ERR_NO)
                     return err;
+
                 err = parse_number(sgl, &obj_generation);
                 if (err != ERR_NO)
                     return err;
-                err = parse_free_indicator(sgl, &free_indicator);
+
+                if (parse_word(sgl, "f") == ERR_NO)
+                    continue;
+                err = parse_word(sgl, "n");
                 if (err != ERR_NO)
                     return err;
+
                 size_t obj_num = section_start + section_offset;
-                if (free_indicator == IN_USE_ENTRY) {
-                    err = add_xref_entry(sgl->xref, obj_num, obj_offset, obj_generation); if (err != ERR_NO)
-                        return err;
-                }