Initial commit of lz compression tools.

1 files changed, 20 insertions, 0 deletions

diff --git a/tools/lz/nullcomp.c b/tools/lz/nullcomp.c
new file mode 100644
index 00000000..d4535bd3
--- /dev/null
+++ b/tools/lz/nullcomp.c
@@ -0,0 +1,20 @@
+#include "proto.h"
+
+/*
+   Null compressor: stores data uncompressed, using literal (0) commands only.
+   Methods defined: 2
+   Flags values: 0 = split a trailing 33-to-64-byte block at the end into two short blocks; 1 = don't
+*/
+
+struct command * store_uncompressed (__attribute__((unused)) const unsigned char * data, __attribute__((unused)) const unsigned char * bitflipped, unsigned short * size, unsigned flags) {
+  unsigned short position, block, remainder = *size;
+  struct command * result = NULL;
+  *size = 0;
+  for (position = 0; remainder; position += block, remainder -= block) {
+    block = (remainder > MAX_COMMAND_COUNT) ? MAX_COMMAND_COUNT : remainder;
+    if (!(flags & 1) && (block <= (2 * SHORT_COMMAND_COUNT)) && (block > SHORT_COMMAND_COUNT)) block = SHORT_COMMAND_COUNT;
+    result = realloc(result, sizeof(struct command) * (1 + *size));
+    result[(*size) ++] = (struct command) {.command = 0, .count = block, .value = position};
+  }
+  return result;
+}