Binary Ninja 3.0 Psuedo C vs Ghidra

README.md

For the test case I'm using one from Ghidra's test suite, which is available here

It was compiled on my macOS machine with the following command:

$ clang -o decomp -O1 -g decomp.c -Wall -Wshadow -Wextra -std=c17 -arch arm64e

Some metadata:

~/public-src/ghidra/Ghidra/Test/TestResources/src/cpp/decomp(master*) » file decomp
decomp: Mach-O 64-bit executable arm64e
~/public-src/ghidra/Ghidra/Test/TestResources/src/cpp/decomp(master*) » ll -l decomp
-rwxr-xr-x  1 ryan  staff    34K Feb  1 13:22 decomp

I didn't fix up either decompilation, this is the default settings.

decomp_lzw.c

// This is the function we decompile in the examples

static void lzw_decompress(mytable *table,char *instream,int len,char* output)
{
  mystring local_2c;
  mystring *local_14;
  unsigned local_10;
  unsigned local_c;
  int local_8;
  
  init_string(&local_2c);
  local_c = 0;
  init_table(table);
  local_10 = (unsigned)*instream;
  instream = instream + 1;
  local_c = local_c + 0x1d & 0xff;
  set_string(&local_2c,table->entry + (local_10 ^ local_c));
  output = output_string(output,&local_2c);
  local_8 = 1;
  while (local_8 < len) {
    local_10 = (unsigned)*instream;
    instream = instream + 1;
    local_c = local_c + 0x1d & 0xff;
    local_14 = table->entry + (local_10 ^ local_c);
    output = output_string(output,local_14);
    append_character(&local_2c,local_14->data[0]);
    add_code(table,&local_2c);
    set_string(&local_2c,local_14);
    local_8 = local_8 + 1;
  }
  *output = 0x00;
  return;
}