Initial revision

diff --git a/src/compress.c b/src/compress.c
new file mode 100644 (file)
index 0000000..3867014
--- /dev/null
+++ b/src/compress.c
@@ -0,0 +1,34 @@
+/*
+ * compress routines:
+ *     is_compress() returns 0 if uncompressed, number of bits if compressed.
+ *     uncompress(old, n, new) - uncompress old into new, return sizeof new
+ */
+
+/* Check for compression, return nbits. Algorithm, in magic(4) format:
+ * 0       string          \037\235        compressed data
+ * >2      byte&0x80       >0              block compressed
+ * >2      byte&0x1f       x               %d bits
+ */
+int
+is_compress(p, b)
+char *p;
+int *b;
+{
+
+       if (*p != '\037' || *(p+1) != '\235')
+               return 0;       /* not compress()ed */
+
+       *b = *(p+2) & 0x80;
+       return *(p+2) & 0x1f;
+}
+
+int
+uncompress(old, n, new)
+unsigned char *old, **new;
+int n;
+{
+       *new = old;     /* TODO write this */
+       **new = 0;      /* prevent infinite loop, skeleton version only */
+       return n;
+}
+