Adding bdiff-lua.c

1 files changed, 41 insertions, 0 deletions

diff --git a/bdiff-lua.c b/bdiff-lua.c
new file mode 100644
index 0000000..5b5fbe9
--- /dev/null
+++ b/bdiff-lua.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char ** argv) {
+    FILE * in1, * in2, * out;
+    size_t s1, s2, p, b, c;
+    int b1, b2;
+    
+    if (argc != 4) { printf("Usage: %s fin1 fin2 fout\n", argv[0]); exit(-1); }
+    
+    if ((in1 = fopen(argv[1], "rb")) == 0) { printf("Error opening %s\n", argv[1]); perror("fopen"); exit(-1); }
+    if ((in2 = fopen(argv[2], "rb")) == 0) { printf("Error opening %s\n", argv[2]); perror("fopen"); exit(-1); }
+    if ((out = fopen(argv[3], "wb")) == 0) { printf("Error opening %s\n", argv[3]); perror("fopen"); exit(-1); }
+    
+    fseek(in1, 0, SEEK_END); s1 = ftell(in1); fseek(in1, 0, SEEK_SET);
+    fseek(in2, 0, SEEK_END); s2 = ftell(in2); fseek(in2, 0, SEEK_SET);
+    
+    if (s1 != s2) { printf("Error: files are of different sizes.\n"); exit(-1); }
+    
+    b = s1 - 1;
+    
+    fprintf(out, "patch = {\n");
+    
+    for (p = 0; p < s1; p++) {
+        b1 = fgetc(in1);
+        b2 = fgetc(in2);
+        
+        if (b1 != b2) {
+            b++;
+            if ((b != p) && (b != s1)) fprintf(out, " },\n");
+            if (b != p) { fprintf(out, "    [0x%06x] = { ", p); c = 0; } else { fprintf(out, ", "); c++; }
+            if (c == 16) { fprintf(out, "\n                   "); c = 0; }
+            fprintf(out, "0x%02x", b2);
+            b = p;
+        }
+    }
+    
+    fprintf(out, " },\n}\n");
+    
+    fclose(in1); fclose(in2); fclose(out);
+}