Add 'neozip/' from commit 'c2712b8a345191f6ed79558c089777df94590087'

git-subtree-dir: neozip
git-subtree-mainline: b1e34e861b5d732afe828d58aad2c638135061fd
git-subtree-split: c2712b8a345191f6ed79558c089777df94590087

1 files changed, 98 insertions, 0 deletions

diff --git a/neozip/compress.c b/neozip/compress.c
new file mode 100644
index 0000000000..cc6e8d9601
--- /dev/null
+++ b/neozip/compress.c
@@ -0,0 +1,98 @@
+/* compress.c -- compress a memory buffer
+ * Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "zbuild.h"
+#include "zutil.h"
+
+/* ===========================================================================
+ *  Architecture-specific hooks.
+ */
+#ifdef S390_DFLTCC_DEFLATE
+#  include "arch/s390/dfltcc_common.h"
+#else
+/* Returns the upper bound on compressed data length based on uncompressed data length, assuming default settings.
+ * Zero means that arch-specific deflation code behaves identically to the regular zlib-ng algorithms. */
+#  define DEFLATE_BOUND_COMPLEN(source_len) 0
+#endif
+
+/* ===========================================================================
+     Compresses the source buffer into the destination buffer. The level
+   parameter has the same meaning as in deflateInit.  sourceLen is the byte
+   length of the source buffer. Upon entry, destLen is the total size of the
+   destination buffer, which must be at least 0.1% larger than sourceLen plus
+   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
+
+     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
+   Z_STREAM_ERROR if the level parameter is invalid.
+*/
+z_int32_t Z_EXPORT PREFIX(compress2)(unsigned char *dest, z_uintmax_t *destLen, const unsigned char *source,
+                        z_uintmax_t sourceLen, z_int32_t level) {
+    PREFIX3(stream) stream;
+    int err;
+    const unsigned int max = (unsigned int)-1;
+    z_size_t left;
+
+    left = *destLen;
+    *destLen = 0;
+
+    stream.zalloc = NULL;
+    stream.zfree = NULL;
+    stream.opaque = NULL;
+
+    err = PREFIX(deflateInit)(&stream, level);
+    if (err != Z_OK)
+        return err;
+
+    stream.next_out = dest;
+    stream.avail_out = 0;
+    stream.next_in = (z_const unsigned char *)source;
+    stream.avail_in = 0;
+
+    do {
+        if (stream.avail_out == 0) {
+            stream.avail_out = left > (unsigned long)max ? max : (unsigned int)left;
+            left -= stream.avail_out;
+        }
+        if (stream.avail_in == 0) {
+            stream.avail_in = sourceLen > (unsigned long)max ? max : (unsigned int)sourceLen;
+            sourceLen -= stream.avail_in;
+        }
+        err = PREFIX(deflate)(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
+    } while (err == Z_OK);
+
+    *destLen = stream.total_out;
+    PREFIX(deflateEnd)(&stream);
+    return err == Z_STREAM_END ? Z_OK : err;
+}
+
+/* ===========================================================================
+ */
+z_int32_t Z_EXPORT PREFIX(compress)(unsigned char *dest, z_uintmax_t *destLen, const unsigned char *source, z_uintmax_t sourceLen) {
+    return PREFIX(compress2)(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
+}
+
+/* ===========================================================================
+   If the default memLevel or windowBits for deflateInit() is changed, then
+   this function needs to be updated.
+ */
+z_uintmax_t Z_EXPORT PREFIX(compressBound)(z_uintmax_t sourceLen) {
+    z_uintmax_t complen = DEFLATE_BOUND_COMPLEN(sourceLen);
+
+    if (complen > 0)
+        /* Architecture-specific code provided an upper bound. */
+        return complen + ZLIB_WRAPLEN;
+
+#ifndef NO_QUICK_STRATEGY
+    return sourceLen                       /* The source size itself */
+      + (sourceLen == 0 ? 1 : 0)           /* Always at least one byte for any input */
+      + (sourceLen < 9 ? 1 : 0)            /* One extra byte for lengths less than 9 */
+      + DEFLATE_QUICK_OVERHEAD(sourceLen)  /* Source encoding overhead, padded to next full byte */
+      + DEFLATE_BLOCK_OVERHEAD             /* Deflate block overhead bytes */
+      + ZLIB_WRAPLEN;                      /* zlib wrapper */
+#else
+    return sourceLen + (sourceLen >> 4) + 7 + ZLIB_WRAPLEN;
+#endif
+}