Subset of zlib for inflate/deflate support.

[shibboleth/cpp-opensaml.git] / saml / zlib / compress.c

diff --git a/saml/zlib/compress.c b/saml/zlib/compress.c
new file mode 100644 (file)
index 0000000..d37e84f
--- /dev/null
+++ b/saml/zlib/compress.c
@@ -0,0 +1,79 @@
+/* compress.c -- compress a memory buffer\r
+ * Copyright (C) 1995-2003 Jean-loup Gailly.\r
+ * For conditions of distribution and use, see copyright notice in zlib.h\r
+ */\r
+\r
+/* @(#) $Id$ */\r
+\r
+#define ZLIB_INTERNAL\r
+#include "zlib.h"\r
+\r
+/* ===========================================================================\r
+     Compresses the source buffer into the destination buffer. The level\r
+   parameter has the same meaning as in deflateInit.  sourceLen is the byte\r
+   length of the source buffer. Upon entry, destLen is the total size of the\r
+   destination buffer, which must be at least 0.1% larger than sourceLen plus\r
+   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.\r
+\r
+     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough\r
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer,\r
+   Z_STREAM_ERROR if the level parameter is invalid.\r
+*/\r
+int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)\r
+    Bytef *dest;\r
+    uLongf *destLen;\r
+    const Bytef *source;\r
+    uLong sourceLen;\r
+    int level;\r
+{\r
+    z_stream stream;\r
+    int err;\r
+\r
+    stream.next_in = (Bytef*)source;\r
+    stream.avail_in = (uInt)sourceLen;\r
+#ifdef MAXSEG_64K\r
+    /* Check for source > 64K on 16-bit machine: */\r
+    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;\r
+#endif\r
+    stream.next_out = dest;\r
+    stream.avail_out = (uInt)*destLen;\r
+    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;\r
+\r
+    stream.zalloc = (alloc_func)0;\r
+    stream.zfree = (free_func)0;\r
+    stream.opaque = (voidpf)0;\r
+\r
+    err = deflateInit(&stream, level);\r
+    if (err != Z_OK) return err;\r
+\r
+    err = deflate(&stream, Z_FINISH);\r
+    if (err != Z_STREAM_END) {\r
+        deflateEnd(&stream);\r
+        return err == Z_OK ? Z_BUF_ERROR : err;\r
+    }\r
+    *destLen = stream.total_out;\r
+\r
+    err = deflateEnd(&stream);\r
+    return err;\r
+}\r
+\r
+/* ===========================================================================\r
+ */\r
+int ZEXPORT compress (dest, destLen, source, sourceLen)\r
+    Bytef *dest;\r
+    uLongf *destLen;\r
+    const Bytef *source;\r
+    uLong sourceLen;\r
+{\r
+    return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);\r
+}\r
+\r
+/* ===========================================================================\r
+     If the default memLevel or windowBits for deflateInit() is changed, then\r
+   this function needs to be updated.\r
+ */\r
+uLong ZEXPORT compressBound (sourceLen)\r
+    uLong sourceLen;\r
+{\r
+    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11;\r
+}\r