1 files changed, 122 insertions, 0 deletions
diff --git a/tools/tmxcopy/zlibutils.cpp b/tools/tmxcopy/zlibutils.cpp
new file mode 100644
index 000000000..39c19aeef
--- /dev/null
+++ b/tools/tmxcopy/zlibutils.cpp
@@ -0,0 +1,122 @@
+
+#include <stdlib.h>
+#include <iostream>
+#include <cassert>
+#include <zlib.h>
+
+/**
+ * Inflates either zlib or gzip deflated memory. The inflated memory is
+ * expected to be freed by the caller.
+ */
+int
+inflateMemory(unsigned char *in, unsigned int inLength,
+              unsigned char *&out, unsigned int &outLength)
+{
+    int bufferSize = 256 * 1024;
+    int ret;
+    z_stream strm;
+
+    out = (unsigned char*) malloc(bufferSize);
+
+    strm.zalloc = Z_NULL;
+    strm.zfree = Z_NULL;
+    strm.opaque = Z_NULL;
+    strm.next_in = in;
+    strm.avail_in = inLength;
+    strm.next_out = out;
+    strm.avail_out = bufferSize;
+
+    ret = inflateInit2(&strm, 15 + 32);
+
+    if (ret != Z_OK)
+        return ret;
+
+    do
+    {
+        if (strm.next_out == NULL)
+        {
+            inflateEnd(&strm);
+            return Z_MEM_ERROR;
+        }
+
+        ret = inflate(&strm, Z_NO_FLUSH);
+        assert(ret != Z_STREAM_ERROR);
+
+        switch (ret) {
+            case Z_NEED_DICT:
+                ret = Z_DATA_ERROR;
+            case Z_DATA_ERROR:
+            case Z_MEM_ERROR:
+                (void) inflateEnd(&strm);
+                return ret;
+        }
+
+        if (ret != Z_STREAM_END)
+        {
+            out = (unsigned char*) realloc(out, bufferSize * 2);
+
+            if (out == NULL)
+            {
+                inflateEnd(&strm);
+                return Z_MEM_ERROR;
+            }
+
+            strm.next_out = out + bufferSize;
+            strm.avail_out = bufferSize;
+            bufferSize *= 2;
+        }
+    }
+    while (ret != Z_STREAM_END);
+    assert(strm.avail_in == 0);
+
+    outLength = bufferSize - strm.avail_out;
+    (void) inflateEnd(&strm);
+    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
+}
+
+int
+inflateMemory(unsigned char *in, unsigned int inLength,
+              unsigned char *&out)
+{
+    unsigned int outLength = 0;
+    int ret = inflateMemory(in, inLength, out, outLength);
+
+    if (ret != Z_OK || out == NULL)
+    {
+        if (ret == Z_MEM_ERROR)
+        {
+            std::cerr<<"Error: Out of memory while decompressing map data!";
+        }
+        else if (ret == Z_VERSION_ERROR)
+        {
+            std::cerr<<"Error: Incompatible zlib version!";
+        }
+        else if (ret == Z_DATA_ERROR)
+        {
+            std::cerr<<"Error: Incorrect zlib compressed data!";
+        }
+        else
+        {
+            std::cerr<<"Error: Unknown error while decompressing map data!";
+        }
+
+        free(out);
+        out = NULL;
+        outLength = 0;
+    }
+
+    return outLength;
+}
+
+/*
+int
+compressMemory(unsigned char *in, unsigned int inLength,
+              unsigned char *&out, unsigned int &outLength)
+{
+    uLongf fOutLen = outLength;
+    int ret = compress((Bytef*)out, &fOutLen, (Bytef*)in, inLength);
+    outLength = fOutLen;
+
+    assert (ret == Z_OK);
+}
+*/