Imported to git.

10 files changed, 1109 insertions, 0 deletions

diff --git a/src/liblzma/simple/Makefile.am b/src/liblzma/simple/Makefile.am
new file mode 100644
index 00000000..a37f1eb5
--- /dev/null
+++ b/src/liblzma/simple/Makefile.am
@@ -0,0 +1,46 @@
+##
+##  Copyright (C) 2007 Lasse Collin
+##
+##  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.
+##
+
+noinst_LTLIBRARIES = libsimple.la
+libsimple_la_CPPFLAGS = \
+	-I@top_srcdir@/src/liblzma/api \
+	-I@top_srcdir@/src/liblzma/common
+libsimple_la_SOURCES = \
+	simple_coder.c \
+	simple_coder.h \
+	simple_private.h
+
+if COND_FILTER_X86
+libsimple_la_SOURCES += x86.c
+endif
+
+if COND_FILTER_POWERPC
+libsimple_la_SOURCES += powerpc.c
+endif
+
+if COND_FILTER_IA64
+libsimple_la_SOURCES += ia64.c
+endif
+
+if COND_FILTER_ARM
+libsimple_la_SOURCES += arm.c
+endif
+
+if COND_FILTER_ARMTHUMB
+libsimple_la_SOURCES += armthumb.c
+endif
+
+if COND_FILTER_SPARC
+libsimple_la_SOURCES += sparc.c
+endif
diff --git a/src/liblzma/simple/arm.c b/src/liblzma/simple/arm.c
new file mode 100644
index 00000000..284371c3
--- /dev/null
+++ b/src/liblzma/simple/arm.c
@@ -0,0 +1,76 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       arm.c
+/// \brief      Filter for ARM binaries
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+arm_code(lzma_simple *simple lzma_attribute((unused)),
+		uint32_t now_pos, bool is_encoder,
+		uint8_t *buffer, size_t size)
+{
+	uint32_t i;
+	for (i = 0; i + 4 <= size; i += 4) {
+		if (buffer[i + 3] == 0xEB) {
+			uint32_t src = (buffer[i + 2] << 16)
+					| (buffer[i + 1] << 8)
+					| (buffer[i + 0]);
+			src <<= 2;
+
+			uint32_t dest;
+			if (is_encoder)
+				dest = now_pos + (uint32_t)(i) + 8 + src;
+			else
+				dest = src - (now_pos + (uint32_t)(i) + 8);
+
+			dest >>= 2;
+			buffer[i + 2] = (dest >> 16);
+			buffer[i + 1] = (dest >> 8);
+			buffer[i + 0] = dest;
+		}
+	}
+
+	return i;
+}
+
+
+static lzma_ret
+arm_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&arm_code, 0, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_arm_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	return arm_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_arm_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	return arm_coder_init(next, allocator, filters, false);
+}
diff --git a/src/liblzma/simple/armthumb.c b/src/liblzma/simple/armthumb.c
new file mode 100644
index 00000000..51ed2c43
--- /dev/null
+++ b/src/liblzma/simple/armthumb.c
@@ -0,0 +1,81 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       armthumb.c
+/// \brief      Filter for ARM-Thumb binaries
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+armthumb_code(lzma_simple *simple lzma_attribute((unused)),
+		uint32_t now_pos, bool is_encoder,
+		uint8_t *buffer, size_t size)
+{
+	uint32_t i;
+	for (i = 0; i + 4 <= size; i += 2) {
+		if ((buffer[i + 1] & 0xF8) == 0xF0
+				&& (buffer[i + 3] & 0xF8) == 0xF8) {
+			uint32_t src = ((buffer[i + 1] & 0x7) << 19)
+					| (buffer[i + 0] << 11)
+					| ((buffer[i + 3] & 0x7) << 8)
+					| (buffer[i + 2]);
+
+			src <<= 1;
+
+			uint32_t dest;
+			if (is_encoder)
+				dest = now_pos + (uint32_t)(i) + 4 + src;
+			else
+				dest = src - (now_pos + (uint32_t)(i) + 4);
+
+			dest >>= 1;
+			buffer[i + 1] = 0xF0 | ((dest >> 19) & 0x7);
+			buffer[i + 0] = (dest >> 11);
+			buffer[i + 3] = 0xF8 | ((dest >> 8) & 0x7);
+			buffer[i + 2] = (dest);
+			i += 2;
+		}
+	}
+
+	return i;
+}
+
+
+static lzma_ret
+armthumb_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&armthumb_code, 0, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_armthumb_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return armthumb_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_armthumb_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return armthumb_coder_init(next, allocator, filters, false);
+}
diff --git a/src/liblzma/simple/ia64.c b/src/liblzma/simple/ia64.c
new file mode 100644
index 00000000..59830521
--- /dev/null
+++ b/src/liblzma/simple/ia64.c
@@ -0,0 +1,117 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       ia64.c
+/// \brief      Filter for IA64 (Itanium) binaries
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+ia64_code(lzma_simple *simple lzma_attribute((unused)),
+		uint32_t now_pos, bool is_encoder,
+		uint8_t *buffer, size_t size)
+{
+	static const uint32_t BRANCH_TABLE[32] = {
+		0, 0, 0, 0, 0, 0, 0, 0,
+		0, 0, 0, 0, 0, 0, 0, 0,
+		4, 4, 6, 6, 0, 0, 7, 7,
+		4, 4, 0, 0, 4, 4, 0, 0
+	};
+
+	size_t i;
+	for (i = 0; i + 16 <= size; i += 16) {
+		const uint32_t instr_template = buffer[i] & 0x1F;
+		const uint32_t mask = BRANCH_TABLE[instr_template];
+		uint32_t bit_pos = 5;
+
+		for (size_t slot = 0; slot < 3; ++slot, bit_pos += 41) {
+			if (((mask >> slot) & 1) == 0)
+				continue;
+
+			const size_t byte_pos = (bit_pos >> 3);
+			const uint32_t bit_res = bit_pos & 0x7;
+			uint64_t instruction = 0;
+
+			for (size_t j = 0; j < 6; ++j)
+				instruction += (uint64_t)(
+						buffer[i + j + byte_pos])
+						<< (8 * j);
+
+			uint64_t inst_norm = instruction >> bit_res;
+
+			if (((inst_norm >> 37) & 0xF) == 0x5
+					&& ((inst_norm >> 9) & 0x7) == 0
+					/* &&  (inst_norm & 0x3F)== 0 */
+					) {
+				uint32_t src = (uint32_t)(
+						(inst_norm >> 13) & 0xFFFFF);
+				src |= ((inst_norm >> 36) & 1) << 20;
+
+				src <<= 4;
+
+				uint32_t dest;
+				if (is_encoder)
+					dest = now_pos + (uint32_t)(i) + src;
+				else
+					dest = src - (now_pos + (uint32_t)(i));
+
+				dest >>= 4;
+
+				inst_norm &= ~((uint64_t)(0x8FFFFF) << 13);
+				inst_norm |= (uint64_t)(dest & 0xFFFFF) << 13;
+				inst_norm |= (uint64_t)(dest & 0x100000)
+						<< (36 - 20);
+
+				instruction &= (1 << bit_res) - 1;
+				instruction |= (inst_norm << bit_res);
+
+				for (size_t j = 0; j < 6; j++)
+					buffer[i + j + byte_pos] = (uint8_t)(
+							instruction
+							>> (8 * j));
+			}
+		}
+	}
+
+	return i;
+}
+
+
+static lzma_ret
+ia64_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&ia64_code, 0, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_ia64_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return ia64_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_ia64_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return ia64_coder_init(next, allocator, filters, false);
+}
diff --git a/src/liblzma/simple/powerpc.c b/src/liblzma/simple/powerpc.c
new file mode 100644
index 00000000..a3089fca
--- /dev/null
+++ b/src/liblzma/simple/powerpc.c
@@ -0,0 +1,80 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       powerpc.c
+/// \brief      Filter for PowerPC (big endian) binaries
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+powerpc_code(lzma_simple *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 = ((buffer[i + 0] & 3) << 24)
+					| (buffer[i + 1] << 16)
+					| (buffer[i + 2] << 8)
+					| (buffer[i + 3] & (~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, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&powerpc_code, 0, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_powerpc_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return powerpc_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_powerpc_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return powerpc_coder_init(next, allocator, filters, false);
+}
diff --git a/src/liblzma/simple/simple_coder.c b/src/liblzma/simple/simple_coder.c
new file mode 100644
index 00000000..f60dff34
--- /dev/null
+++ b/src/liblzma/simple/simple_coder.c
@@ -0,0 +1,306 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       simple_coder.c
+/// \brief      Wrapper for simple filters
+///
+/// Simple filters don't change the size of the data i.e. number of bytes
+/// in equals the number of bytes out.
+//
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+/// Copied or encodes/decodes more data to out[]. Checks and updates
+/// uncompressed_size when we are the last coder in the chain.
+/// If we aren't the last filter in the chain, we don't need to care about
+/// uncompressed size, since we don't change it; the next filter in the
+/// chain will check it anyway.
+static lzma_ret
+copy_or_code(lzma_coder *coder, lzma_allocator *allocator,
+		const uint8_t *restrict in, size_t *restrict in_pos,
+		size_t in_size, uint8_t *restrict out,
+		size_t *restrict out_pos, size_t out_size, lzma_action action)
+{
+	assert(!coder->end_was_reached);
+
+	if (coder->next.code == NULL) {
+		const size_t in_avail = in_size - *in_pos;
+
+		if (coder->is_encoder) {
+			if (action == LZMA_FINISH) {
+				// If uncompressed size is known and the
+				// amount of available input doesn't match
+				// the uncompressed size, return an error.
+				if (coder->uncompressed_size
+						!= LZMA_VLI_VALUE_UNKNOWN
+						&& coder->uncompressed_size
+							!= in_avail)
+					return LZMA_DATA_ERROR;
+
+			} else if (coder->uncompressed_size
+					< (lzma_vli)(in_avail)) {
+				// There is too much input available.
+				return LZMA_DATA_ERROR;
+			}
+		} else {
+			// Limit in_size so that we don't copy too much.
+			if ((lzma_vli)(in_avail) > coder->uncompressed_size)
+				in_size = *in_pos + (size_t)(
+						coder->uncompressed_size);
+		}
+
+		// Store the old position so we can update uncompressed_size.
+		const size_t out_start = *out_pos;
+
+		// Copy the data
+		bufcpy(in, in_pos, in_size, out, out_pos, out_size);
+
+		// Update uncompressed_size.
+		if (coder->uncompressed_size != LZMA_VLI_VALUE_UNKNOWN)
+			coder->uncompressed_size -= *out_pos - out_start;
+
+		// Check if end of stream was reached.
+		if (coder->is_encoder) {
+			if (action == LZMA_FINISH && *in_pos == in_size)
+				coder->end_was_reached = true;
+		} else {
+			if (coder->uncompressed_size == 0)
+				coder->end_was_reached = true;
+		}
+
+	} else {
+		// Call the next coder in the chain to provide us some data.
+		// We don't care about uncompressed_size here, because
+		// the next filter in the chain will do it for us (since
+		// we don't change the size of the data).
+		const lzma_ret ret = coder->next.code(
+				coder->next.coder, allocator,
+				in, in_pos, in_size,
+				out, out_pos, out_size, action);
+
+		if (ret == LZMA_STREAM_END) {
+			assert(!coder->is_encoder
+					|| action == LZMA_FINISH);
+			coder->end_was_reached = true;
+
+		} else if (ret != LZMA_OK) {
+			return ret;
+		}
+	}
+
+	return LZMA_OK;
+}
+
+
+static size_t
+call_filter(lzma_coder *coder, uint8_t *buffer, size_t size)
+{
+	const size_t filtered = coder->filter(coder->simple,
+			coder->now_pos, coder->is_encoder,
+			buffer, size);
+	coder->now_pos += filtered;
+	return filtered;
+}
+
+
+static lzma_ret
+simple_code(lzma_coder *coder, lzma_allocator *allocator,
+		const uint8_t *restrict in, size_t *restrict in_pos,
+		size_t in_size, uint8_t *restrict out,
+		size_t *restrict out_pos, size_t out_size, lzma_action action)
+{
+	// Flush already filtered data from coder->buffer[] to out[].
+	if (coder->pos < coder->filtered) {
+		bufcpy(coder->buffer, &coder->pos, coder->filtered,
+				out, out_pos, out_size);
+
+		// If we couldn't flush all the filtered data, return to
+		// application immediatelly.
+		if (coder->pos < coder->filtered)
+			return LZMA_OK;
+
+		if (coder->end_was_reached) {
+			assert(coder->filtered == coder->size);
+			return LZMA_STREAM_END;
+		}
+	}
+
+	// If we get here, there is no filtered data left in the buffer.
+	coder->filtered = 0;
+
+	assert(!coder->end_was_reached);
+
+	// If there is more output space left than there is unfiltered data
+	// in coder->buffer[], flush coder->buffer[] to out[], and copy/code
+	// more data to out[] hopefully filling it completely. Then filter
+	// the data in out[]. This step is where most of the data gets
+	// filtered if the buffer sizes used by the application are reasonable.
+	const size_t out_avail = out_size - *out_pos;
+	const size_t buf_avail = coder->size - coder->pos;
+	if (out_avail > buf_avail) {
+		// Store the old position so that we know from which byte
+		// to start filtering.
+		const size_t out_start = *out_pos;
+
+		// Flush data from coder->buffer[] to out[], but don't reset
+		// coder->pos and coder->size yet. This way the coder can be
+		// restarted if the next filter in the chain returns e.g.
+		// LZMA_MEM_ERROR.
+		memcpy(out + *out_pos, coder->buffer + coder->pos, buf_avail);
+		*out_pos += buf_avail;
+
+		// Copy/Encode/Decode more data to out[].
+		{
+			const lzma_ret ret = copy_or_code(coder, allocator,
+					in, in_pos, in_size,
+					out, out_pos, out_size, action);
+			assert(ret != LZMA_STREAM_END);
+			if (ret != LZMA_OK)
+				return ret;
+		}
+
+		// Filter out[].
+		const size_t size = *out_pos - out_start;
+		const size_t filtered = call_filter(
+				coder, out + out_start, size);
+
+		const size_t unfiltered = size - filtered;
+		assert(unfiltered <= coder->allocated / 2);
+
+		// Now we can update coder->pos and coder->size, because
+		// the next coder in the chain (if any) was successful.
+		coder->pos = 0;
+		coder->size = unfiltered;
+
+		if (coder->end_was_reached) {
+			// The last byte has been copied to out[] already.
+			// They are left as is.
+			coder->size = 0;
+
+		} else if (unfiltered > 0) {
+			// There is unfiltered data left in out[]. Copy it to
+			// coder->buffer[] and rewind *out_pos appropriately.
+			*out_pos -= unfiltered;
+			memcpy(coder->buffer, out + *out_pos, unfiltered);
+		}
+	} else if (coder->pos > 0) {
+		memmove(coder->buffer, coder->buffer + coder->pos, buf_avail);
+		coder->size -= coder->pos;
+		coder->pos = 0;
+	}
+
+	assert(coder->pos == 0);
+
+	// If coder->buffer[] isn't empty, try to fill it by copying/decoding
+	// more data. Then filter coder->buffer[] and copy the successfully
+	// filtered data to out[]. It is probable, that some filtered and
+	// unfiltered data will be left to coder->buffer[].
+	if (coder->size > 0) {
+		{
+			const lzma_ret ret = copy_or_code(coder, allocator,
+					in, in_pos, in_size,
+					coder->buffer, &coder->size,
+					coder->allocated, action);
+			assert(ret != LZMA_STREAM_END);
+			if (ret != LZMA_OK)
+				return ret;
+		}
+
+		coder->filtered = call_filter(
+				coder, coder->buffer, coder->size);
+
+		// Everything is considered to be filtered if coder->buffer[]
+		// contains the last bytes of the data.
+		if (coder->end_was_reached)
+			coder->filtered = coder->size;
+
+		// Flush as much as possible.
+		bufcpy(coder->buffer, &coder->pos, coder->filtered,
+				out, out_pos, out_size);
+	}
+
+	// Check if we got everything done.
+	if (coder->end_was_reached && coder->pos == coder->size)
+		return LZMA_STREAM_END;
+
+	return LZMA_OK;
+}
+
+
+static void
+simple_coder_end(lzma_coder *coder, lzma_allocator *allocator)
+{
+	lzma_next_coder_end(&coder->next, allocator);
+	lzma_free(coder->simple, allocator);
+	lzma_free(coder, allocator);
+	return;
+}
+
+
+extern lzma_ret
+lzma_simple_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters,
+		size_t (*filter)(lzma_simple *simple, uint32_t now_pos,
+			bool is_encoder, uint8_t *buffer, size_t size),
+		size_t simple_size, size_t unfiltered_max, bool is_encoder)
+{
+	// Allocate memory for the lzma_coder structure if needed.
+	if (next->coder == NULL) {
+		// Here we allocate space also for the temporary buffer. We
+		// need twice the size of unfiltered_max, because then it
+		// is always possible to filter at least unfiltered_max bytes
+		// more data in coder->buffer[] if it can be filled completely.
+		next->coder = lzma_alloc(sizeof(lzma_coder)
+				+ 2 * unfiltered_max, allocator);
+		if (next->coder == NULL)
+			return LZMA_MEM_ERROR;
+
+		next->code = &simple_code;
+		next->end = &simple_coder_end;
+
+		next->coder->next = LZMA_NEXT_CODER_INIT;
+		next->coder->filter = filter;
+		next->coder->allocated = 2 * unfiltered_max;
+
+		// Allocate memory for filter-specific data structure.
+		if (simple_size > 0) {
+			next->coder->simple = lzma_alloc(
+					simple_size, allocator);
+			if (next->coder->simple == NULL)
+				return LZMA_MEM_ERROR;
+		} else {
+			next->coder->simple = NULL;
+		}
+	}
+
+	if (filters[0].options != NULL) {
+		const lzma_options_simple *simple = filters[0].options;
+		next->coder->now_pos = simple->start_offset;
+	} else {
+		next->coder->now_pos = 0;
+	}
+
+	// Reset variables.
+	next->coder->is_encoder = is_encoder;
+	next->coder->end_was_reached = false;
+	next->coder->uncompressed_size = filters[0].uncompressed_size;
+	next->coder->pos = 0;
+	next->coder->filtered = 0;
+	next->coder->size = 0;
+
+	return lzma_next_filter_init(
+			&next->coder->next, allocator, filters + 1);
+}
diff --git a/src/liblzma/simple/simple_coder.h b/src/liblzma/simple/simple_coder.h
new file mode 100644
index 00000000..b682f84f
--- /dev/null
+++ b/src/liblzma/simple/simple_coder.h
@@ -0,0 +1,68 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       simple_coder.h
+/// \brief      Wrapper for simple filters
+//
+//
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_SIMPLE_CODER_H
+#define LZMA_SIMPLE_CODER_H
+
+#include "common.h"
+
+
+extern lzma_ret lzma_simple_x86_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+extern lzma_ret lzma_simple_x86_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+
+extern lzma_ret lzma_simple_powerpc_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+extern lzma_ret lzma_simple_powerpc_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+
+extern lzma_ret lzma_simple_ia64_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+extern lzma_ret lzma_simple_ia64_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+
+extern lzma_ret lzma_simple_arm_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+extern lzma_ret lzma_simple_arm_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+
+extern lzma_ret lzma_simple_armthumb_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+extern lzma_ret lzma_simple_armthumb_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+
+extern lzma_ret lzma_simple_sparc_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+extern lzma_ret lzma_simple_sparc_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters);
+
+#endif
diff --git a/src/liblzma/simple/simple_private.h b/src/liblzma/simple/simple_private.h
new file mode 100644
index 00000000..a512396c
--- /dev/null
+++ b/src/liblzma/simple/simple_private.h
@@ -0,0 +1,86 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       simple_private.h
+/// \brief      Private definitions for so called simple filters
+//
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_SIMPLE_PRIVATE_H
+#define LZMA_SIMPLE_PRIVATE_H
+
+#include "simple_coder.h"
+
+
+typedef struct lzma_simple_s lzma_simple;
+
+struct lzma_coder_s {
+	/// Next filter in the chain
+	lzma_next_coder next;
+
+	/// True if the next coder in the chain has returned LZMA_STREAM_END
+	/// or if we have processed uncompressed_size bytes.
+	bool end_was_reached;
+
+	/// True if filter() should encode the data; false to decode.
+	/// Currently all simple filters use the same function for encoding
+	/// and decoding, because the difference between encoders and decoders
+	/// is very small.
+	bool is_encoder;
+
+	/// Size of the data *left* to be processed, or LZMA_VLI_VALUE_UNKNOWN
+	/// if unknown.
+	lzma_vli uncompressed_size;
+
+	/// Pointer to filter-specific function, which does
+	/// the actual filtering.
+	size_t (*filter)(lzma_simple *simple, uint32_t now_pos,
+			bool is_encoder, uint8_t *buffer, size_t size);
+
+	/// Pointer to filter-specific data, or NULL if filter doesn't need
+	/// any extra data.
+	lzma_simple *simple;
+
+	/// The lowest 32 bits of the current position in the data. Most
+	/// filters need this to do conversions between absolute and relative
+	/// addresses.
+	uint32_t now_pos;
+
+	/// Size of the memory allocated for the buffer.
+	size_t allocated;
+
+	/// Flushing position in the temporary buffer. buffer[pos] is the
+	/// next byte to be copied to out[].
+	size_t pos;
+
+	/// buffer[filtered] is the first unfiltered byte. When pos is smaller
+	/// than filtered, there is unflushed filtered data in the buffer.
+	size_t filtered;
+
+	/// Total number of bytes (both filtered and unfiltered) currently
+	/// in the temporary buffer.
+	size_t size;
+
+	/// Temporary buffer
+	uint8_t buffer[];
+};
+
+
+extern lzma_ret lzma_simple_coder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters,
+		size_t (*filter)(lzma_simple *simple, uint32_t now_pos,
+			bool is_encoder, uint8_t *buffer, size_t size),
+		size_t simple_size, size_t unfiltered_max, bool is_encoder);
+
+#endif
diff --git a/src/liblzma/simple/sparc.c b/src/liblzma/simple/sparc.c
new file mode 100644
index 00000000..09bc67f1
--- /dev/null
+++ b/src/liblzma/simple/sparc.c
@@ -0,0 +1,88 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       sparc.c
+/// \brief      Filter for SPARC binaries
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+static size_t
+sparc_code(lzma_simple *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) {
+
+		if ((buffer[i] == 0x40 && (buffer[i + 1] & 0xC0) == 0x00)
+				|| (buffer[i] == 0x7F
+				&& (buffer[i + 1] & 0xC0) == 0xC0)) {
+
+			uint32_t src = ((uint32_t)buffer[i + 0] << 24)
+					| ((uint32_t)buffer[i + 1] << 16)
+					| ((uint32_t)buffer[i + 2] << 8)
+					| ((uint32_t)buffer[i + 3]);
+
+			src <<= 2;
+
+			uint32_t dest;
+			if (is_encoder)
+				dest = now_pos + (uint32_t)(i) + src;
+			else
+				dest = src - (now_pos + (uint32_t)(i));
+
+			dest >>= 2;
+
+			dest = (((0 - ((dest >> 22) & 1)) << 22) & 0x3FFFFFFF)
+					| (dest & 0x3FFFFF)
+					| 0x40000000;
+
+			buffer[i + 0] = (uint8_t)(dest >> 24);
+			buffer[i + 1] = (uint8_t)(dest >> 16);
+			buffer[i + 2] = (uint8_t)(dest >> 8);
+			buffer[i + 3] = (uint8_t)(dest);
+		}
+	}
+
+	return i;
+}
+
+
+static lzma_ret
+sparc_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	return lzma_simple_coder_init(next, allocator, filters,
+			&sparc_code, 0, 4, is_encoder);
+}
+
+
+extern lzma_ret
+lzma_simple_sparc_encoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return sparc_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_sparc_decoder_init(lzma_next_coder *next,
+		lzma_allocator *allocator, const lzma_filter_info *filters)
+{
+	return sparc_coder_init(next, allocator, filters, false);
+}
diff --git a/src/liblzma/simple/x86.c b/src/liblzma/simple/x86.c
new file mode 100644
index 00000000..a48a5750
--- /dev/null
+++ b/src/liblzma/simple/x86.c
@@ -0,0 +1,161 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       x86.c
+/// \brief      Filter for x86 binaries (BCJ filter)
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 Lasse Collin
+//
+//  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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "simple_private.h"
+
+
+#define Test86MSByte(b) ((b) == 0 || (b) == 0xFF)
+
+
+struct lzma_simple_s {
+	uint32_t prev_mask;
+	uint32_t prev_pos;
+};
+
+
+static size_t
+x86_code(lzma_simple *simple, uint32_t now_pos, bool is_encoder,
+		uint8_t *buffer, size_t size)
+{
+	static const bool MASK_TO_ALLOWED_STATUS[8]
+		= { true, true, true, false, true, false, false, false };
+
+	static const uint32_t MASK_TO_BIT_NUMBER[8]
+			= { 0, 1, 2, 2, 3, 3, 3, 3 };
+
+	uint32_t prev_mask = simple->prev_mask;
+	uint32_t prev_pos = simple->prev_pos;
+
+	if (size < 5)
+		return 0;
+
+	if (now_pos - prev_pos > 5)
+		prev_pos = now_pos - 5;
+
+	const size_t limit = size - 5;
+	size_t buffer_pos = 0;
+
+	while (buffer_pos <= limit) {
+		uint8_t b = buffer[buffer_pos];
+		if (b != 0xE8 && b != 0xE9) {
+			++buffer_pos;
+			continue;
+		}
+
+		const uint32_t offset = now_pos + (uint32_t)(buffer_pos)
+				- prev_pos;
+		prev_pos = now_pos + (uint32_t)(buffer_pos);
+
+		if (offset > 5) {
+			prev_mask = 0;
+		} else {
+			for (uint32_t i = 0; i < offset; ++i) {
+				prev_mask &= 0x77;
+				prev_mask <<= 1;
+			}
+		}
+
+		b = buffer[buffer_pos + 4];
+
+		if (Test86MSByte(b)
+			&& MASK_TO_ALLOWED_STATUS[(prev_mask >> 1) & 0x7]
+				&& (prev_mask >> 1) < 0x10) {
+
+			uint32_t src = ((uint32_t)(b) << 24)
+				| ((uint32_t)(buffer[buffer_pos + 3]) << 16)
+				| ((uint32_t)(buffer[buffer_pos + 2]) << 8)
+				| (buffer[buffer_pos + 1]);
+
+			uint32_t dest;
+			while (true) {
+				if (is_encoder)
+					dest = src + (now_pos + (uint32_t)(
+							buffer_pos) + 5);
+				else
+					dest = src - (now_pos + (uint32_t)(
+							buffer_pos) + 5);
+
+				if (prev_mask == 0)
+					break;
+
+				const uint32_t i = MASK_TO_BIT_NUMBER[
+						prev_mask >> 1];
+
+				b = (uint8_t)(dest >> (24 - i * 8));
+
+				if (!Test86MSByte(b))
+					break;
+
+				src = dest ^ ((1 << (32 - i * 8)) - 1);
+			}
+
+			buffer[buffer_pos + 4]
+					= (uint8_t)(~(((dest >> 24) & 1) - 1));
+			buffer[buffer_pos + 3] = (uint8_t)(dest >> 16);
+			buffer[buffer_pos + 2] = (uint8_t)(dest >> 8);
+			buffer[buffer_pos + 1] = (uint8_t)(dest);
+			buffer_pos += 5;
+			prev_mask = 0;
+
+		} else {
+			++buffer_pos;
+			prev_mask |= 1;
+			if (Test86MSByte(b))
+				prev_mask |= 0x10;
+		}
+	}
+
+	simple->prev_mask = prev_mask;
+	simple->prev_pos = prev_pos;
+
+	return buffer_pos;
+}
+
+
+static lzma_ret
+x86_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters, bool is_encoder)
+{
+	const lzma_ret ret = lzma_simple_coder_init(next, allocator, filters,
+			&x86_code, sizeof(lzma_simple), 5, is_encoder);
+
+	if (ret == LZMA_OK) {
+		next->coder->simple->prev_mask = 0;
+		next->coder->simple->prev_pos = (uint32_t)(-5);
+	}
+
+	return ret;
+}
+
+
+extern lzma_ret
+lzma_simple_x86_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	return x86_coder_init(next, allocator, filters, true);
+}
+
+
+extern lzma_ret
+lzma_simple_x86_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	return x86_coder_init(next, allocator, filters, false);
+}