Add PAK methods 10 (crush) and 11 (distill).

pak/bitstream.h

@@ -0,0 +1,75 @@
+/*
+ * bitstream.h - Bit stream input implementation
+ *
+ * Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+
+#ifndef BITSTREAM_H
+#define BITSTREAM_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct BitStream
+{
+    const uint8_t *data;
+    size_t         length;
+    size_t         pos;
+    uint32_t       bitbuffer;
+    int            bitcount;
+    bool           eof;
+} BitStream;
+
+// Initialize bit stream
+void bitstream_init(BitStream *bs, const uint8_t *data, size_t length);
+
+// Read a single bit (MSB first)
+uint32_t bitstream_read_bit(BitStream *bs);
+
+// Read a single bit (LSB first)
+uint32_t bitstream_read_bit_le(BitStream *bs);
+
+// Read multiple bits (MSB first)
+uint32_t bitstream_read_bits(BitStream *bs, int count);
+
+// Read multiple bits (LSB first)
+uint32_t bitstream_read_bits_le(BitStream *bs, int count);
+
+// Peek at bits without consuming them (MSB first)
+uint32_t bitstream_peek_bits(BitStream *bs, int count);
+
+// Peek at bits without consuming them (LSB first)
+uint32_t bitstream_peek_bits_le(BitStream *bs, int count);
+
+// Skip previously peeked bits (MSB first)
+void bitstream_skip_bits(BitStream *bs, int count);
+
+// Skip previously peeked bits (LSB first)
+void bitstream_skip_bits_le(BitStream *bs, int count);
+
+// Read a byte
+uint8_t bitstream_read_byte(BitStream *bs);
+
+// Read a 16-bit little endian integer
+uint16_t bitstream_read_uint16_le(BitStream *bs);
+
+// Check if end of stream reached
+bool bitstream_eof(BitStream *bs);
+
+#endif /* BITSTREAM_H */