diff options
Diffstat (limited to 'tools/xor_compress.c')
| -rw-r--r-- | tools/xor_compress.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/tools/xor_compress.c b/tools/xor_compress.c index 2e1f4fe..0e1c5e2 100644 --- a/tools/xor_compress.c +++ b/tools/xor_compress.c @@ -67,17 +67,10 @@ int write_compressed(const char *filename, unsigned char *data, size_t n, bool v for (size_t i = 0; i < n; runs++) { unsigned char byte = data[i++]; unsigned char size = 0; - if (data[i] == v) { - // Alternating (>= 0x80) - // Run stops at 0x80 bytes or when the values stop alternating - for (; i < n && size < 0x80 && data[i] == ((size % 2) ? byte : v); size++, i++); - fputc(size + 0x7f, f); - fputc(v ^ byte, f); - if (size % 2 == 0) v = byte; - } else { + if (i == n || data[i] != v) { // Sequential (< 0x80) // Run stops at 0x80 bytes or when the value two ahead is equal to v - unsigned char buffer[256]; + unsigned char buffer[0x80]; buffer[size++] = v ^ byte; for (; i < n; i++) { v = byte; @@ -87,6 +80,13 @@ int write_compressed(const char *filename, unsigned char *data, size_t n, bool v } fputc(size - 1, f); fwrite(buffer, 1, size, f); + } else { + // Alternating (>= 0x80) + // Run stops at 0x80 bytes or when the values stop alternating + for (; i < n && size < 0x80 && data[i] == ((size % 2) ? byte : v); size++, i++); + fputc(size + 0x7f, f); + fputc(v ^ byte, f); + if (size % 2 == 0) v = byte; } } |