Zlib ng

2026-09-05 19:46:35 +00:00 · 2019-06-30 18:13:46 -07:00
parent d7c110041a
commit e086f53b97
116 changed files with 30587 additions and 13 deletions
@@ -0,0 +1,77 @@
+/* deflate_p.h -- Private inline functions and macros shared with more than
+ *                one deflate method
+ *
+ * Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ */
+
+#ifndef DEFLATE_P_H
+#define DEFLATE_P_H
+
+/* Forward declare common non-inlined functions declared in deflate.c */
+
+#ifdef ZLIB_DEBUG
+void check_match(deflate_state *s, IPos start, IPos match, int length);
+#else
+#define check_match(s, start, match, length)
+#endif
+void flush_pending(PREFIX3(stream) *strm);
+
+/* ===========================================================================
+ * Insert string str in the dictionary and set match_head to the previous head
+ * of the hash chain (the most recent string with same hash key). Return
+ * the previous length of the hash chain.
+ * IN  assertion: all calls to to INSERT_STRING are made with consecutive
+ *    input characters and the first MIN_MATCH bytes of str are valid
+ *    (except for the last MIN_MATCH-1 bytes of the input file).
+ */
+
+static inline Pos insert_string_c(deflate_state *const s, const Pos str, unsigned int count) {
+    Pos ret = 0;
+    unsigned int idx;
+
+    for (idx = 0; idx < count; idx++) {
+        UPDATE_HASH(s, s->ins_h, str+idx);
+
+        Pos head = s->head[s->ins_h];
+        if (head != str+idx) {
+          s->prev[(str+idx) & s->w_mask] = head;
+          s->head[s->ins_h] = str+idx;
+          if (idx == count - 1)
+            ret = head;
+        } else if (idx == count - 1) {
+          ret = str + idx;
+        }
+    }
+    return ret;
+}
+
+/* ===========================================================================
+ * Flush the current block, with given end-of-file flag.
+ * IN assertion: strstart is set to the end of the current match.
+ */
+#define FLUSH_BLOCK_ONLY(s, last) { \
+    _tr_flush_block(s, (s->block_start >= 0L ? \
+                   (char *)&s->window[(unsigned)s->block_start] : \
+                   NULL), \
+                   (unsigned long)((long)s->strstart - s->block_start), \
+                   (last)); \
+    s->block_start = s->strstart; \
+    flush_pending(s->strm); \
+    Tracev((stderr, "[FLUSH]")); \
+}
+
+/* Same but force premature exit if necessary. */
+#define FLUSH_BLOCK(s, last) { \
+    FLUSH_BLOCK_ONLY(s, last); \
+    if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
+}
+
+/* Maximum stored block length in deflate format (not including header). */
+#define MAX_STORED 65535
+
+/* Minimum of a and b. */
+#define MIN(a, b) ((a) > (b) ? (b) : (a))
+
+#endif