From f8a45104387184c7ec7e29f9e3164018443d6160 Mon Sep 17 00:00:00 2001
From: Kim Woelders <kim@woelders.dk>
Date: Thu, 21 Mar 2024 06:43:27 +0100
Subject: [PATCH] imlib2_load: Add crc32 printout

For comparing results before/after loader changes.
---
 src/bin/Makefile.am   |  2 +-
 src/bin/imlib2_load.c | 27 ++++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/bin/Makefile.am b/src/bin/Makefile.am
index 4e0bbc7..effc09a 100644
--- a/src/bin/Makefile.am
+++ b/src/bin/Makefile.am
@@ -23,7 +23,7 @@ imlib2_conv_SOURCES = imlib2_conv.c $(SRCS_UTIL)
 imlib2_conv_LDADD   = $(top_builddir)/src/lib/libImlib2.la
 
 imlib2_load_SOURCES = imlib2_load.c $(SRCS_UTIL)
-imlib2_load_LDADD   = $(top_builddir)/src/lib/libImlib2.la $(CLOCK_LIBS)
+imlib2_load_LDADD   = $(top_builddir)/src/lib/libImlib2.la -lz $(CLOCK_LIBS)
 
 imlib2_show_SOURCES = imlib2_show.c $(SRCS_X11)
 imlib2_show_LDADD   = $(top_builddir)/src/lib/libImlib2.la -lX11 -lm
diff --git a/src/bin/imlib2_load.c b/src/bin/imlib2_load.c
index 3edfb96..81658d9 100644
--- a/src/bin/imlib2_load.c
+++ b/src/bin/imlib2_load.c
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <zlib.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 
@@ -34,6 +35,7 @@ static FILE    *fout;
    "Usage:\n" \
    "  imlib2_load [OPTIONS] FILE...\n" \
    "OPTIONS:\n" \
+   "  -C  : Print CRC32 of image data\n" \
    "  -c  : Enable image caching\n" \
    "  -e  : Break on error\n" \
    "  -f  : Load with imlib_load_image_fd()\n" \
@@ -51,6 +53,21 @@ usage(void)
     printf(HELP);
 }
 
+static unsigned int
+image_get_crc32(Imlib_Image im)
+{
+    const unsigned char *data;
+    unsigned int    crc, w, h;
+
+    imlib_context_set_image(im);
+    w = imlib_image_get_width();
+    h = imlib_image_get_height();
+    data = (const unsigned char *)imlib_image_get_data_for_reading_only();
+    crc = crc32(0, data, w * h * sizeof(uint32_t));
+
+    return crc;
+}
+
 static Imlib_Image *
 image_load_fd(const char *file, int *perr)
 {
@@ -144,6 +161,7 @@ main(int argc, char **argv)
     int             load_cnt, cnt;
     int             load_mode;
     bool            opt_cache;
+    bool            show_crc;
 
     fout = stdout;
     verbose = 0;
@@ -153,11 +171,15 @@ main(int argc, char **argv)
     load_cnt = 1;
     load_mode = LOAD_DEFER;
     opt_cache = false;
+    show_crc = false;
 
-    while ((opt = getopt(argc, argv, "cefijmn:pvx")) != -1)
+    while ((opt = getopt(argc, argv, "Ccefijmn:pvx")) != -1)
     {
         switch (opt)
         {
+        case 'C':
+            show_crc = true;
+            break;
         case 'c':
             opt_cache = true;
             break;
@@ -278,6 +300,9 @@ main(int argc, char **argv)
                 }
             }
 
+            if (cnt == 0 && show_crc)
+                printf("%08x %s\n", image_get_crc32(im), argv[0]);
+
             if (opt_cache)
                 imlib_free_image();
             else