From cc5a1989d867078a384b0904592ce718f90829dd Mon Sep 17 00:00:00 2001
From: Dave Davenport <qball@gmpclient.org>
Date: Sat, 17 Oct 2020 21:59:12 +0200
Subject: [PATCH] [RofiIconFetcher] Don't exit out on libjpeg error, but don't
 load image.

---
 configure.ac               |  1 +
 source/rofi-icon-fetcher.c | 33 +++++++++++++++++++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2adc8c53..f05ee356 100644
--- a/configure.ac
+++ b/configure.ac
@@ -126,6 +126,7 @@ AC_SEARCH_LIBS([floor],[m],,      AC_MSG_ERROR("Could not find floor in math lib
 AC_SEARCH_LIBS([ceil], [m],,      AC_MSG_ERROR("Could not find ceil in math library"))
 
 AC_CHECK_HEADER([sysexits.h],, AC_MSG_ERROR("Could not find the sysexists.h header file"))
+AC_CHECK_HEADER([setjmp.h],,   AC_MSG_ERROR("Could not find the setjmp.h header file"))
 
 dnl ---------------------------------------------------------------------
 dnl Check dependencies
diff --git a/source/rofi-icon-fetcher.c b/source/rofi-icon-fetcher.c
index 09f9d8e6..60ede6f3 100644
--- a/source/rofi-icon-fetcher.c
+++ b/source/rofi-icon-fetcher.c
@@ -42,6 +42,8 @@
 #include <stdint.h>
 #include <jpeglib.h>
 
+#include <setjmp.h>
+
 typedef struct
 {
     // Context for icon-themes.
@@ -171,11 +173,29 @@ static cairo_surface_t* cairo_image_surface_create_from_jpeg_private ( struct jp
 
     return surface;
 }
+struct jpegErrorManager {
+    /* "public" fields */
+    struct jpeg_error_mgr pub;
+    /* for return to caller */
+    jmp_buf setjmp_buffer;
+};
+char jpegLastErrorMsg[JMSG_LENGTH_MAX];
+static void jpegErrorExit (j_common_ptr cinfo)
+{
+    /* cinfo->err actually points to a jpegErrorManager struct */
+    struct jpegErrorManager* myerr = (struct jpegErrorManager*) cinfo->err;
+
+    /* Create the message */
+    ( *(cinfo->err->format_message) ) (cinfo, jpegLastErrorMsg);
+    g_warning ( jpegLastErrorMsg );
+
+    /* Jump to the setjmp point */
+    longjmp(myerr->setjmp_buffer, 1);
+}
 
 static cairo_surface_t* cairo_image_surface_create_from_jpeg ( const char* file )
 {
     struct jpeg_decompress_struct cinfo;
-    struct jpeg_error_mgr         jerr;
     cairo_surface_t               * surface;
     FILE                          * infile;
 
@@ -183,7 +203,16 @@ static cairo_surface_t* cairo_image_surface_create_from_jpeg ( const char* file
         return NULL;
     }
 
-    cinfo.err = jpeg_std_error ( &jerr );
+    struct jpegErrorManager jerr;
+    cinfo.err = jpeg_std_error( &jerr.pub);
+    jerr.pub.error_exit = jpegErrorExit;
+    /* Establish the setjmp return context for my_error_exit to use. */
+    if (setjmp(jerr.setjmp_buffer)) {
+      /* If we get here, the JPEG code has signaled an error. */
+      jpeg_destroy_decompress(&cinfo);
+      fclose(infile);
+      return NULL;
+    }
 
     jpeg_create_decompress ( &cinfo );
     jpeg_stdio_src ( &cinfo, infile );