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-rw-r--r--src/compression.c77
-rw-r--r--src/compression.h27
-rw-r--r--src/local.mk2
3 files changed, 106 insertions, 0 deletions
diff --git a/src/compression.c b/src/compression.c
new file mode 100644
index 0000000..5e7b07a
--- /dev/null
+++ b/src/compression.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2013 P. J. McDermott
+ *
+ * This file is part of Dodge Balls
+ *
+ * Dodge Balls is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Dodge Balls is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Dodge Balls. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stddef.h>
+#include <zlib.h>
+#include "compression.h"
+#include "output.h"
+
+static void
+_db_zlib_err(int status)
+{
+ switch (status) {
+ case Z_OK:
+ case Z_STREAM_END:
+ break;
+ case Z_MEM_ERROR:
+ db_err("zlib error: out of memory");
+ break;
+ case Z_VERSION_ERROR:
+ db_err("zlib error: incompatible library version");
+ break;
+ case Z_STREAM_ERROR:
+ db_err("zlib error: invalid stream");
+ break;
+ case Z_NEED_DICT:
+ db_err("zlib error: need dictionary");
+ break;
+ case Z_DATA_ERROR:
+ db_err("zlib error: corrupted data");
+ break;
+ case Z_BUF_ERROR:
+ db_err("zlib error: buffer error");
+ break;
+ default:
+ db_err("zlib error: unknown");
+ break;
+ }
+}
+
+void
+db_decompress(char *src, size_t src_len, char *dest, size_t dest_len)
+{
+ z_stream d_stream;
+
+ d_stream.zalloc = Z_NULL;
+ d_stream.zfree = Z_NULL;
+ d_stream.opaque = Z_NULL;
+ d_stream.next_in = (Bytef *) src;
+ d_stream.avail_in = src_len;
+ d_stream.next_out = (Bytef *) dest;
+ d_stream.avail_out = dest_len;
+
+ db_dbg("Initializing inflation stream...");
+ _db_zlib_err(inflateInit2(&d_stream, 15 + 32));
+
+ db_dbg("Inflating %zu bytes into up to %zu bytes...", src_len, dest_len);
+ _db_zlib_err(inflate(&d_stream, Z_NO_FLUSH));
+
+ db_dbg("Ending inflation stream...");
+ _db_zlib_err(inflateEnd(&d_stream));
+}
diff --git a/src/compression.h b/src/compression.h
new file mode 100644
index 0000000..894a3fd
--- /dev/null
+++ b/src/compression.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2013 P. J. McDermott
+ *
+ * This file is part of Dodge Balls
+ *
+ * Dodge Balls is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Dodge Balls is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Dodge Balls. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DB_COMPRESSION_H_
+#define DB_COMPRESSION_H_
+
+#include <stddef.h>
+
+void db_decompress(char *src, size_t src_len, char *dest, size_t dest_len);
+
+#endif /* DB_COMPRESSION_H_ */
diff --git a/src/local.mk b/src/local.mk
index 4b6f55d..c0c83dd 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -3,6 +3,8 @@ dodge_balls_SOURCES += \
%reldir%/base64.h \
%reldir%/collision.c \
%reldir%/collision.h \
+ %reldir%/compression.c \
+ %reldir%/compression.h \
%reldir%/defs.h \
%reldir%/dirs.c \
%reldir%/dirs.h \