[util] Add optional debug messages to zbin.c

diff --git a/src/util/zbin.c b/src/util/zbin.c
index b24f401..c1082b3 100644 (file)
--- a/src/util/zbin.c
+++ b/src/util/zbin.c
@@ -6,6 +6,8 @@
 #include "nrv2b.c"
 FILE *infile, *outfile;
 
+#define DEBUG 0
+
 struct input_file {
        void *buf;
        size_t len;
@@ -151,6 +153,11 @@ static int process_zinfo_copy ( struct input_file *input,
                return -1;
        }
 
+       if ( DEBUG ) {
+               fprintf ( stderr, "COPY [%#zx,%#zx) to [%#zx,%#zx)\n", offset, ( offset + len ),
+                         output->len, ( output->len + len ) );
+       }
+
        memcpy ( ( output->buf + output->len ),
                 ( input->buf + offset ), len );
        output->len += len;
@@ -184,6 +191,11 @@ static int process_zinfo_pack ( struct input_file *input,
                return -1;
        }
 
+       if ( DEBUG ) {
+               fprintf ( stderr, "PACK [%#zx,%#zx) to [%#zx,%#zx)\n", offset, ( offset + len ),
+                         output->len, ( output->len + packed_len ) );
+       }
+
        output->len += packed_len;
        if ( output->len > output->max_len ) {
                fprintf ( stderr, "Output buffer overrun on pack\n" );
@@ -200,6 +212,8 @@ static int process_zinfo_subtract ( struct input_file *input,
        size_t offset = subtract->offset;
        void *target;
        long delta;
+       unsigned long old;
+       unsigned long new;
 
        if ( ( offset + datasize ) > output->len ) {
                fprintf ( stderr, "Subtract at %#zx outside output buffer\n",
@@ -214,21 +228,34 @@ static int process_zinfo_subtract ( struct input_file *input,
        switch ( datasize ) {
        case 1: {
                uint8_t *byte = target;
+               old = *byte;
                *byte += delta;
+               new = *byte;
                break; }
        case 2: {
                uint16_t *word = target;
+               old = *word;
                *word += delta;
+               new = *word;
                break; }
        case 4: {
                uint32_t *dword = target;
+               old = *dword;
                *dword += delta;
+               new = *dword;
                break; }
        default:
                fprintf ( stderr, "Unsupported subtract datasize %d\n",
                          datasize );
                return -1;
        }
+
+       if ( DEBUG ) {
+               fprintf ( stderr, "SUBx [%#zx,%#zx) (%#lx+(%#lx/%#lx)-(%#lx/%#lx)) = %#lx\n",
+                         offset, ( offset + datasize ), old, output->len, subtract->divisor,
+                         input->len, subtract->divisor, new );
+       }
+
        return 0;
 }