diff options
Diffstat (limited to 'tools/xor_compress.py')
| -rw-r--r-- | tools/xor_compress.py | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/tools/xor_compress.py b/tools/xor_compress.py index 1c3a2f1..42d091f 100644 --- a/tools/xor_compress.py +++ b/tools/xor_compress.py @@ -32,19 +32,7 @@ while i < n: i += 1 runs += 1 - if data[i] == v: - # Alternating (>= 0x80) - # Run stops at 0x80 bytes or when the values stop alternating - size = 0 - while i < n and size < 0x80 and data[i] == (byte if size % 2 else v): - size += 1 - i += 1 - output.append(size + 0x7f) - output.append(v ^ byte) - if not size % 2: - v = byte - - else: + if i == n or data[i] != v: # Sequential (< 0x80) # Run stops at 0x80 bytes or when the value two ahead is equal to v buffer = [v ^ byte] @@ -57,6 +45,17 @@ while i < n: i += 1 output.append(len(buffer) - 1) output.extend(buffer) + else: + # Alternating (>= 0x80) + # Run stops at 0x80 bytes or when the values stop alternating + size = 0 + while i < n and size < 0x80 and data[i] == (byte if size % 2 else v): + size += 1 + i += 1 + output.append(size + 0x7f) + output.append(v ^ byte) + if not size % 2: + v = byte with open(out_filename, 'wb') as f: f.write(output) |