Patch from Aurelien Jacobs to add unlzma. (A new decompression type,

see www.7-zip.org)

1 files changed, 347 insertions, 0 deletions

diff --git a/archival/libunarchive/decompress_unlzma.c b/archival/libunarchive/decompress_unlzma.c
new file mode 100644
index 0000000..977cb48
--- /dev/null
+++ b/archival/libunarchive/decompress_unlzma.c
@@ -0,0 +1,347 @@
+/*
+ * Small lzma deflate implementation.
+ * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
+ * Copyright (C) 1999-2005  Igor Pavlov
+ *
+ * This program 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 program 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <byteswap.h>
+
+#include "libbb.h"
+
+#include "rangecoder.h"
+
+
+typedef struct {
+	uint8_t pos;
+	uint32_t dict_size;
+	uint64_t dst_size;
+} __attribute__ ((packed)) lzma_header_t;
+
+
+#define LZMA_BASE_SIZE 1846
+#define LZMA_LIT_SIZE 768
+
+#define LZMA_NUM_POS_BITS_MAX 4
+
+#define LZMA_LEN_NUM_LOW_BITS 3
+#define LZMA_LEN_NUM_MID_BITS 3
+#define LZMA_LEN_NUM_HIGH_BITS 8
+
+#define LZMA_LEN_CHOICE 0
+#define LZMA_LEN_CHOICE_2 (LZMA_LEN_CHOICE + 1)
+#define LZMA_LEN_LOW (LZMA_LEN_CHOICE_2 + 1)
+#define LZMA_LEN_MID (LZMA_LEN_LOW \
+                      + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS)))
+#define LZMA_LEN_HIGH (LZMA_LEN_MID \
+                       +(1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS)))
+#define LZMA_NUM_LEN_PROBS (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS))
+
+#define LZMA_NUM_STATES 12
+#define LZMA_NUM_LIT_STATES 7
+
+#define LZMA_START_POS_MODEL_INDEX 4
+#define LZMA_END_POS_MODEL_INDEX 14
+#define LZMA_NUM_FULL_DISTANCES (1 << (LZMA_END_POS_MODEL_INDEX >> 1))
+
+#define LZMA_NUM_POS_SLOT_BITS 6
+#define LZMA_NUM_LEN_TO_POS_STATES 4
+
+#define LZMA_NUM_ALIGN_BITS 4
+
+#define LZMA_MATCH_MIN_LEN 2
+
+#define LZMA_IS_MATCH 0
+#define LZMA_IS_REP (LZMA_IS_MATCH + (LZMA_NUM_STATES <<LZMA_NUM_POS_BITS_MAX))
+#define LZMA_IS_REP_G0 (LZMA_IS_REP + LZMA_NUM_STATES)
+#define LZMA_IS_REP_G1 (LZMA_IS_REP_G0 + LZMA_NUM_STATES)
+#define LZMA_IS_REP_G2 (LZMA_IS_REP_G1 + LZMA_NUM_STATES)
+#define LZMA_IS_REP_0_LONG (LZMA_IS_REP_G2 + LZMA_NUM_STATES)
+#define LZMA_POS_SLOT (LZMA_IS_REP_0_LONG \
+                       + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX))
+#define LZMA_SPEC_POS (LZMA_POS_SLOT \
+                       +(LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS))
+#define LZMA_ALIGN (LZMA_SPEC_POS \
+                    + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX)
+#define LZMA_LEN_CODER (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS))
+#define LZMA_REP_LEN_CODER (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS)
+#define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS)
+
+
+int unlzma(int src_fd, int dst_fd)
+{
+	lzma_header_t header;
+	int lc, pb, lp;
+	uint32_t pos_state_mask;
+	uint32_t literal_pos_mask;
+	uint32_t pos;
+	uint16_t *p;
+	uint16_t *prob;
+	uint16_t *prob_lit;
+	int num_bits;
+	int num_probs;
+	rc_t rc;
+	int i, mi;
+	uint8_t *buffer;
+	uint8_t previous_byte = 0;
+	size_t buffer_pos = 0, global_pos = 0;
+	int len = 0;
+	int state = 0;
+	uint32_t rep0 = 1, rep1 = 1, rep2 = 1, rep3 = 1;
+
+	if (read(src_fd, &header, sizeof(header)) != sizeof(header))
+		bb_error_msg_and_die("can't read header");
+
+	if (header.pos >= (9 * 5 * 5))
+		bb_error_msg_and_die("bad header");
+	mi = header.pos / 9;
+	lc = header.pos % 9;
+	pb = mi / 5;
+	lp = mi % 5;
+	pos_state_mask = (1 << pb) - 1;
+	literal_pos_mask = (1 << lp) - 1;
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+	header.dict_size = bswap_32(header.dict_size);
+	header.dst_size = bswap_64(header.dst_size);
+#endif							/* __BYTE_ORDER */
+
+	if (header.dict_size == 0)
+		header.dict_size = 1;
+
+	buffer = xmalloc(MIN(header.dst_size, header.dict_size));
+
+	num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
+	p = xmalloc(num_probs * sizeof(*p));
+	num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp));
+	for (i = 0; i < num_probs; i++)
+		p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
+
+	rc_init(&rc, src_fd, 0x10000);
+
+	while (global_pos + buffer_pos < header.dst_size) {
+		int pos_state = (buffer_pos + global_pos) & pos_state_mask;
+
+		prob =
+			p + LZMA_IS_MATCH + (state << LZMA_NUM_POS_BITS_MAX) + pos_state;
+		if (rc_is_bit_0(&rc, prob)) {
+			mi = 1;
+			rc_update_bit_0(&rc, prob);
+			prob = (p + LZMA_LITERAL + (LZMA_LIT_SIZE
+					* ((((buffer_pos + global_pos) & literal_pos_mask) << lc)
+					+ (previous_byte >> (8 - lc)))));
+
+			if (state >= LZMA_NUM_LIT_STATES) {
+				int match_byte;
+
+				pos = buffer_pos - rep0;
+				while (pos >= header.dict_size)
+					pos += header.dict_size;
+				match_byte = buffer[pos];
+				do {
+					int bit;
+
+					match_byte <<= 1;
+					bit = match_byte & 0x100;
+					prob_lit = prob + 0x100 + bit + mi;
+					if (rc_get_bit(&rc, prob_lit, &mi)) {
+						if (!bit)
+							break;
+					} else {
+						if (bit)
+							break;
+					}
+				} while (mi < 0x100);
+			}
+			while (mi < 0x100) {
+				prob_lit = prob + mi;
+				rc_get_bit(&rc, prob_lit, &mi);
+			}
+			previous_byte = (uint8_t) mi;
+
+			buffer[buffer_pos++] = previous_byte;
+			if (buffer_pos == header.dict_size) {
+				buffer_pos = 0;
+				global_pos += header.dict_size;
+				write(dst_fd, buffer, header.dict_size);
+			}
+			if (state < 4)
+				state = 0;
+			else if (state < 10)
+				state -= 3;
+			else
+				state -= 6;
+		} else {
+			int offset;
+			uint16_t *prob_len;
+
+			rc_update_bit_1(&rc, prob);
+			prob = p + LZMA_IS_REP + state;
+			if (rc_is_bit_0(&rc, prob)) {
+				rc_update_bit_0(&rc, prob);
+				rep3 = rep2;
+				rep2 = rep1;
+				rep1 = rep0;
+				state = state < LZMA_NUM_LIT_STATES ? 0 : 3;
+				prob = p + LZMA_LEN_CODER;
+			} else {
+				rc_update_bit_1(&rc, prob);
+				prob = p + LZMA_IS_REP_G0 + state;
+				if (rc_is_bit_0(&rc, prob)) {
+					rc_update_bit_0(&rc, prob);
+					prob = (p + LZMA_IS_REP_0_LONG
+							+ (state << LZMA_NUM_POS_BITS_MAX) + pos_state);
+					if (rc_is_bit_0(&rc, prob)) {
+						rc_update_bit_0(&rc, prob);
+
+						state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
+						pos = buffer_pos - rep0;
+						while (pos >= header.dict_size)
+							pos += header.dict_size;
+						previous_byte = buffer[pos];
+						buffer[buffer_pos++] = previous_byte;
+						if (buffer_pos == header.dict_size) {
+							buffer_pos = 0;
+							global_pos += header.dict_size;
+							write(dst_fd, buffer, header.dict_size);
+						}
+						continue;
+					} else {
+						rc_update_bit_1(&rc, prob);
+					}
+				} else {
+					uint32_t distance;
+
+					rc_update_bit_1(&rc, prob);
+					prob = p + LZMA_IS_REP_G1 + state;
+					if (rc_is_bit_0(&rc, prob)) {
+						rc_update_bit_0(&rc, prob);
+						distance = rep1;
+					} else {
+						rc_update_bit_1(&rc, prob);
+						prob = p + LZMA_IS_REP_G2 + state;
+						if (rc_is_bit_0(&rc, prob)) {
+							rc_update_bit_0(&rc, prob);
+							distance = rep2;
+						} else {
+							rc_update_bit_1(&rc, prob);
+							distance = rep3;
+							rep3 = rep2;
+						}
+						rep2 = rep1;
+					}
+					rep1 = rep0;
+					rep0 = distance;
+				}
+				state = state < LZMA_NUM_LIT_STATES ? 8 : 11;
+				prob = p + LZMA_REP_LEN_CODER;
+			}
+
+			prob_len = prob + LZMA_LEN_CHOICE;
+			if (rc_is_bit_0(&rc, prob_len)) {
+				rc_update_bit_0(&rc, prob_len);
+				prob_len = (prob + LZMA_LEN_LOW
+							+ (pos_state << LZMA_LEN_NUM_LOW_BITS));
+				offset = 0;
+				num_bits = LZMA_LEN_NUM_LOW_BITS;
+			} else {
+				rc_update_bit_1(&rc, prob_len);
+				prob_len = prob + LZMA_LEN_CHOICE_2;
+				if (rc_is_bit_0(&rc, prob_len)) {
+					rc_update_bit_0(&rc, prob_len);
+					prob_len = (prob + LZMA_LEN_MID
+								+ (pos_state << LZMA_LEN_NUM_MID_BITS));
+					offset = 1 << LZMA_LEN_NUM_LOW_BITS;
+					num_bits = LZMA_LEN_NUM_MID_BITS;
+				} else {
+					rc_update_bit_1(&rc, prob_len);
+					prob_len = prob + LZMA_LEN_HIGH;
+					offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
+							  + (1 << LZMA_LEN_NUM_MID_BITS));
+					num_bits = LZMA_LEN_NUM_HIGH_BITS;
+				}
+			}
+			rc_bit_tree_decode(&rc, prob_len, num_bits, &len);
+			len += offset;
+
+			if (state < 4) {
+				int pos_slot;
+
+				state += LZMA_NUM_LIT_STATES;
+				prob =
+					p + LZMA_POS_SLOT +
+					((len <
+					  LZMA_NUM_LEN_TO_POS_STATES ? len :
+					  LZMA_NUM_LEN_TO_POS_STATES - 1)
+					 << LZMA_NUM_POS_SLOT_BITS);
+				rc_bit_tree_decode(&rc, prob, LZMA_NUM_POS_SLOT_BITS,
+								   &pos_slot);
+				if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
+					num_bits = (pos_slot >> 1) - 1;
+					rep0 = 2 | (pos_slot & 1);
+					if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
+						rep0 <<= num_bits;
+						prob = p + LZMA_SPEC_POS + rep0 - pos_slot - 1;
+					} else {
+						num_bits -= LZMA_NUM_ALIGN_BITS;
+						while (num_bits--)
+							rep0 = (rep0 << 1) | rc_direct_bit(&rc);
+						prob = p + LZMA_ALIGN;
+						rep0 <<= LZMA_NUM_ALIGN_BITS;
+						num_bits = LZMA_NUM_ALIGN_BITS;
+					}
+					i = 1;
+					mi = 1;
+					while (num_bits--) {
+						if (rc_get_bit(&rc, prob + mi, &mi))
+							rep0 |= i;
+						i <<= 1;
+					}
+				} else
+					rep0 = pos_slot;
+				if (++rep0 == 0)
+					break;
+			}
+
+			len += LZMA_MATCH_MIN_LEN;
+
+			do {
+				pos = buffer_pos - rep0;
+				while (pos >= header.dict_size)
+					pos += header.dict_size;
+				previous_byte = buffer[pos];
+				buffer[buffer_pos++] = previous_byte;
+				if (buffer_pos == header.dict_size) {
+					buffer_pos = 0;
+					global_pos += header.dict_size;
+					write(dst_fd, buffer, header.dict_size);
+				}
+				len--;
+			} while (len != 0 && buffer_pos < header.dst_size);
+		}
+	}
+
+	write(dst_fd, buffer, buffer_pos);
+	rc_free(&rc);
+	return 0;
+}
+
+/* vi:set ts=4: */