From 6daff6bcdaa1a0dc59ad243fd9c1329520664b1b Mon Sep 17 00:00:00 2001
From: rgimad <rgimad@kolibrios.org>
Date: Thu, 27 Mar 2025 01:37:29 +0300
Subject: [PATCH] add first packing method

---
 kpack_c.c | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/kpack_c.c b/kpack_c.c
index b85105e..1645fd1 100644
--- a/kpack_c.c
+++ b/kpack_c.c
@@ -8,6 +8,11 @@
 #include <sys/stat.h>
 #include "lzma_c/LZMAEncoderApi.h"
 
+#define METHOD_LZMA 1
+#define METHOD_FLAG_CALLTRICK 0
+#define METHOD_FLAG_CALLTRICK_1 0x40
+#define METHOD_FLAG_CALLTRICK_2 0x80
+
 static const char* str_usage = "Usage: %s [--nologo / -n] [--kernel / -k] [--unpack / -u] <infile> [<outfile>]\n";
 
 static void error_load_infile() {
@@ -20,6 +25,23 @@ static void error_malloc_failed() {
     exit(1);
 }
 
+unsigned byteswap(unsigned val)
+{
+    val = ((val << 8) & 0xFF00FF00 ) | ((val >> 8) & 0xFF00FF ); 
+    return (val << 16) | (val >> 16);
+}
+
+unsigned pack_lzma(unsigned char *infile, unsigned char *outfile, unsigned insize, unsigned char *workmem, unsigned is_kerpack)
+{
+    unsigned outsize = lzma_compress(infile, outfile + 11, insize, workmem, is_kerpack);
+    unsigned tmp = 0;
+    memcpy(&tmp, outfile + 12, 4);
+    tmp = byteswap(tmp);
+    memcpy(outfile + 12, &tmp, 4);
+    return outsize - 1;
+}
+
+
 int main(int argc, char *argv[])
 {
     bool flag_nologo = false;
@@ -112,6 +134,8 @@ int main(int argc, char *argv[])
     }
     fclose(infile_handle);
 
+    // TODO check option -k or not. Below goes packing for without -k option
+
     // calculate maximum size of the output:
     unsigned max_output_size = infile_size*9/8 + 0x400; // should be enough for header
     printf("max_output_size = 0x%x\n", max_output_size);
@@ -137,12 +161,18 @@ int main(int argc, char *argv[])
         error_malloc_failed();
     }
     
-    printf("Compressing ... ");
+    printf("Compressing ... \n");
 
     outfile = outfile2;
     memcpy(outfile2, outfile1, 8);
-    // TODO call pack_lzma
+    unsigned outsize = pack_lzma(infile_buf, outfile, infile_size, workmem, 0);
+    printf("1. outsize = %u bytes\n", outsize);
+    outfilebest = outfile;
+    unsigned method = METHOD_LZMA;
+
     // TODO ...
 
     return 0;
-}
\ No newline at end of file
+}
+
+    
\ No newline at end of file