1 files changed, 80 insertions, 0 deletions
diff --git a/src/liblzma/simple/powerpc.c b/src/liblzma/simple/powerpc.c
new file mode 100644
index 0000000..3a340fd
--- /dev/null
+++ b/src/liblzma/simple/powerpc.c
@@ -0,0 +1,80 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       powerpc.c
+/// \brief      Filter for PowerPC (big endian) binaries
+///
+//  Authors:    Igor Pavlov
+//              Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+powerpc_code(void *simple lzma_attribute((__unused__)),
+		uint32_t now_pos, bool is_encoder,
+		uint8_t *buffer, size_t size)
+{
+	size_t i;
+	for (i = 0; i + 4 <= size; i += 4) {
+		// PowerPC branch 6(48) 24(Offset) 1(Abs) 1(Link)
+		if ((buffer[i] >> 2) == 0x12
+				&& ((buffer[i + 3] & 3) == 1)) {
+
+			const uint32_t src
+				= (((uint32_t)(buffer[i + 0]) & 3) << 24)
+				| ((uint32_t)(buffer[i + 1]) << 16)
+				| ((uint32_t)(buffer[i + 2]) << 8)
+				| ((uint32_t)(buffer[i + 3]) & ~UINT32_C(3));
+
+			uint32_t dest;
+			if (is_encoder)
+				dest = now_pos + (uint32_t)(i) + src;
+			else
+				dest = src - (now_pos + (uint32_t)(i));
+
+			buffer[i + 0] = 0x48 | ((dest >> 24) &  0x03);
+			buffer[i + 1] = (dest >> 16);
+			buffer[i + 2] = (dest >> 8);
+			buffer[i + 3] &= 0x03;
+			buffer[i + 3] |= dest;
+		}
+	}
+
+	return i;
+}
+
+
+static lzma_ret
+powerpc_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&powerpc_code, 0, 4, 4, is_encoder);
+}
+
+
+#ifdef HAVE_ENCODER_POWERPC
+extern lzma_ret
+lzma_simple_powerpc_encoder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	return powerpc_coder_init(next, allocator, filters, true);
+}
+#endif
+
+
+#ifdef HAVE_DECODER_POWERPC
+extern lzma_ret
+lzma_simple_powerpc_decoder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	return powerpc_coder_init(next, allocator, filters, false);
+}
+#endif