rename archival/libunarchive -> archival/libarchive; move bz/ into it

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 465 insertions, 0 deletions

diff --git a/archival/libarchive/decompress_unlzma.c b/archival/libarchive/decompress_unlzma.c
new file mode 100644
index 0000000..a047143
--- /dev/null
+++ b/archival/libarchive/decompress_unlzma.c
@@ -0,0 +1,465 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * 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
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+#include "libbb.h"
+#include "archive.h"
+
+#if ENABLE_FEATURE_LZMA_FAST
+#  define speed_inline ALWAYS_INLINE
+#  define size_inline
+#else
+#  define speed_inline
+#  define size_inline ALWAYS_INLINE
+#endif
+
+
+typedef struct {
+	int fd;
+	uint8_t *ptr;
+
+/* Was keeping rc on stack in unlzma and separately allocating buffer,
+ * but with "buffer 'attached to' allocated rc" code is smaller: */
+	/* uint8_t *buffer; */
+#define RC_BUFFER ((uint8_t*)(rc+1))
+
+	uint8_t *buffer_end;
+
+/* Had provisions for variable buffer, but we don't need it here */
+	/* int buffer_size; */
+#define RC_BUFFER_SIZE 0x10000
+
+	uint32_t code;
+	uint32_t range;
+	uint32_t bound;
+} rc_t;
+
+#define RC_TOP_BITS 24
+#define RC_MOVE_BITS 5
+#define RC_MODEL_TOTAL_BITS 11
+
+
+/* Called twice: once at startup (LZMA_FAST only) and once in rc_normalize() */
+static size_inline void rc_read(rc_t *rc)
+{
+	int buffer_size = safe_read(rc->fd, RC_BUFFER, RC_BUFFER_SIZE);
+//TODO: return -1 instead
+//This will make unlzma delete broken unpacked file on unpack errors
+	if (buffer_size <= 0)
+		bb_error_msg_and_die("unexpected EOF");
+	rc->ptr = RC_BUFFER;
+	rc->buffer_end = RC_BUFFER + buffer_size;
+}
+
+/* Called twice, but one callsite is in speed_inline'd rc_is_bit_1() */
+static void rc_do_normalize(rc_t *rc)
+{
+	if (rc->ptr >= rc->buffer_end)
+		rc_read(rc);
+	rc->range <<= 8;
+	rc->code = (rc->code << 8) | *rc->ptr++;
+}
+
+/* Called once */
+static ALWAYS_INLINE rc_t* rc_init(int fd) /*, int buffer_size) */
+{
+	int i;
+	rc_t *rc;
+
+	rc = xzalloc(sizeof(*rc) + RC_BUFFER_SIZE);
+
+	rc->fd = fd;
+	/* rc->ptr = rc->buffer_end; */
+
+	for (i = 0; i < 5; i++) {
+#if ENABLE_FEATURE_LZMA_FAST
+		if (rc->ptr >= rc->buffer_end)
+			rc_read(rc);
+		rc->code = (rc->code << 8) | *rc->ptr++;
+#else
+		rc_do_normalize(rc);
+#endif
+	}
+	rc->range = 0xFFFFFFFF;
+	return rc;
+}
+
+/* Called once  */
+static ALWAYS_INLINE void rc_free(rc_t *rc)
+{
+	free(rc);
+}
+
+static ALWAYS_INLINE void rc_normalize(rc_t *rc)
+{
+	if (rc->range < (1 << RC_TOP_BITS)) {
+		rc_do_normalize(rc);
+	}
+}
+
+/* rc_is_bit_1 is called 9 times */
+static speed_inline int rc_is_bit_1(rc_t *rc, uint16_t *p)
+{
+	rc_normalize(rc);
+	rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
+	if (rc->code < rc->bound) {
+		rc->range = rc->bound;
+		*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
+		return 0;
+	}
+	rc->range -= rc->bound;
+	rc->code -= rc->bound;
+	*p -= *p >> RC_MOVE_BITS;
+	return 1;
+}
+
+/* Called 4 times in unlzma loop */
+static speed_inline int rc_get_bit(rc_t *rc, uint16_t *p, int *symbol)
+{
+	int ret = rc_is_bit_1(rc, p);
+	*symbol = *symbol * 2 + ret;
+	return ret;
+}
+
+/* Called once */
+static ALWAYS_INLINE int rc_direct_bit(rc_t *rc)
+{
+	rc_normalize(rc);
+	rc->range >>= 1;
+	if (rc->code >= rc->range) {
+		rc->code -= rc->range;
+		return 1;
+	}
+	return 0;
+}
+
+/* Called twice */
+static speed_inline void
+rc_bit_tree_decode(rc_t *rc, uint16_t *p, int num_levels, int *symbol)
+{
+	int i = num_levels;
+
+	*symbol = 1;
+	while (i--)
+		rc_get_bit(rc, p + *symbol, symbol);
+	*symbol -= 1 << num_levels;
+}
+
+
+typedef struct {
+	uint8_t pos;
+	uint32_t dict_size;
+	uint64_t dst_size;
+} PACKED lzma_header_t;
+
+
+/* #defines will force compiler to compute/optimize each one with each usage.
+ * Have heart and use enum instead. */
+enum {
+	LZMA_BASE_SIZE = 1846,
+	LZMA_LIT_SIZE  = 768,
+
+	LZMA_NUM_POS_BITS_MAX = 4,
+
+	LZMA_LEN_NUM_LOW_BITS  = 3,
+	LZMA_LEN_NUM_MID_BITS  = 3,
+	LZMA_LEN_NUM_HIGH_BITS = 8,
+
+	LZMA_LEN_CHOICE     = 0,
+	LZMA_LEN_CHOICE_2   = (LZMA_LEN_CHOICE + 1),
+	LZMA_LEN_LOW        = (LZMA_LEN_CHOICE_2 + 1),
+	LZMA_LEN_MID        = (LZMA_LEN_LOW \
+	                      + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS))),
+	LZMA_LEN_HIGH       = (LZMA_LEN_MID \
+	                      + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS))),
+	LZMA_NUM_LEN_PROBS  = (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS)),
+
+	LZMA_NUM_STATES     = 12,
+	LZMA_NUM_LIT_STATES = 7,
+
+	LZMA_START_POS_MODEL_INDEX = 4,
+	LZMA_END_POS_MODEL_INDEX   = 14,
+	LZMA_NUM_FULL_DISTANCES    = (1 << (LZMA_END_POS_MODEL_INDEX >> 1)),
+
+	LZMA_NUM_POS_SLOT_BITS = 6,
+	LZMA_NUM_LEN_TO_POS_STATES = 4,
+
+	LZMA_NUM_ALIGN_BITS = 4,
+
+	LZMA_MATCH_MIN_LEN  = 2,
+
+	LZMA_IS_MATCH       = 0,
+	LZMA_IS_REP         = (LZMA_IS_MATCH + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)),
+	LZMA_IS_REP_G0      = (LZMA_IS_REP + LZMA_NUM_STATES),
+	LZMA_IS_REP_G1      = (LZMA_IS_REP_G0 + LZMA_NUM_STATES),
+	LZMA_IS_REP_G2      = (LZMA_IS_REP_G1 + LZMA_NUM_STATES),
+	LZMA_IS_REP_0_LONG  = (LZMA_IS_REP_G2 + LZMA_NUM_STATES),
+	LZMA_POS_SLOT       = (LZMA_IS_REP_0_LONG \
+	                      + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX)),
+	LZMA_SPEC_POS       = (LZMA_POS_SLOT \
+	                      + (LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS)),
+	LZMA_ALIGN          = (LZMA_SPEC_POS \
+	                      + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX),
+	LZMA_LEN_CODER      = (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS)),
+	LZMA_REP_LEN_CODER  = (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS),
+	LZMA_LITERAL        = (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS),
+};
+
+
+IF_DESKTOP(long long) int FAST_FUNC
+unpack_lzma_stream(int src_fd, int dst_fd)
+{
+	IF_DESKTOP(long long total_written = 0;)
+	lzma_header_t header;
+	int lc, pb, lp;
+	uint32_t pos_state_mask;
+	uint32_t literal_pos_mask;
+	uint16_t *p;
+	int num_bits;
+	int num_probs;
+	rc_t *rc;
+	int i;
+	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 (full_read(src_fd, &header, sizeof(header)) != sizeof(header)
+	 || header.pos >= (9 * 5 * 5)
+	) {
+		bb_error_msg("bad lzma header");
+		return -1;
+	}
+
+	i = header.pos / 9;
+	lc = header.pos % 9;
+	pb = i / 5;
+	lp = i % 5;
+	pos_state_mask = (1 << pb) - 1;
+	literal_pos_mask = (1 << lp) - 1;
+
+	header.dict_size = SWAP_LE32(header.dict_size);
+	header.dst_size = SWAP_LE64(header.dst_size);
+
+	if (header.dict_size == 0)
+		header.dict_size++;
+
+	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_BASE_SIZE;
+	for (i = 0; i < num_probs; i++)
+		p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
+
+	rc = rc_init(src_fd); /*, RC_BUFFER_SIZE); */
+
+	while (global_pos + buffer_pos < header.dst_size) {
+		int pos_state = (buffer_pos + global_pos) & pos_state_mask;
+		uint16_t *prob = p + LZMA_IS_MATCH + (state << LZMA_NUM_POS_BITS_MAX) + pos_state;
+
+		if (!rc_is_bit_1(rc, prob)) {
+			static const char next_state[LZMA_NUM_STATES] =
+				{ 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
+			int mi = 1;
+
+			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;
+				uint32_t 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;
+					bit ^= (rc_get_bit(rc, prob + 0x100 + bit + mi, &mi) << 8); /* 0x100 or 0 */
+					if (bit)
+						break;
+				} while (mi < 0x100);
+			}
+			while (mi < 0x100) {
+				rc_get_bit(rc, prob + mi, &mi);
+			}
+
+			state = next_state[state];
+
+			previous_byte = (uint8_t) mi;
+#if ENABLE_FEATURE_LZMA_FAST
+ one_byte1:
+			buffer[buffer_pos++] = previous_byte;
+			if (buffer_pos == header.dict_size) {
+				buffer_pos = 0;
+				global_pos += header.dict_size;
+				if (full_write(dst_fd, buffer, header.dict_size) != (ssize_t)header.dict_size)
+					goto bad;
+				IF_DESKTOP(total_written += header.dict_size;)
+			}
+#else
+			len = 1;
+			goto one_byte2;
+#endif
+		} else {
+			int offset;
+			uint16_t *prob2;
+#define prob_len prob2
+
+			prob2 = p + LZMA_IS_REP + state;
+			if (!rc_is_bit_1(rc, prob2)) {
+				rep3 = rep2;
+				rep2 = rep1;
+				rep1 = rep0;
+				state = state < LZMA_NUM_LIT_STATES ? 0 : 3;
+				prob2 = p + LZMA_LEN_CODER;
+			} else {
+				prob2 += LZMA_IS_REP_G0 - LZMA_IS_REP;
+				if (!rc_is_bit_1(rc, prob2)) {
+					prob2 = (p + LZMA_IS_REP_0_LONG
+					        + (state << LZMA_NUM_POS_BITS_MAX)
+					        + pos_state
+					);
+					if (!rc_is_bit_1(rc, prob2)) {
+#if ENABLE_FEATURE_LZMA_FAST
+						uint32_t pos = buffer_pos - rep0;
+						state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
+						while (pos >= header.dict_size)
+							pos += header.dict_size;
+						previous_byte = buffer[pos];
+						goto one_byte1;
+#else
+						state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
+						len = 1;
+						goto string;
+#endif
+					}
+				} else {
+					uint32_t distance;
+
+					prob2 += LZMA_IS_REP_G1 - LZMA_IS_REP_G0;
+					distance = rep1;
+					if (rc_is_bit_1(rc, prob2)) {
+						prob2 += LZMA_IS_REP_G2 - LZMA_IS_REP_G1;
+						distance = rep2;
+						if (rc_is_bit_1(rc, prob2)) {
+							distance = rep3;
+							rep3 = rep2;
+						}
+						rep2 = rep1;
+					}
+					rep1 = rep0;
+					rep0 = distance;
+				}
+				state = state < LZMA_NUM_LIT_STATES ? 8 : 11;
+				prob2 = p + LZMA_REP_LEN_CODER;
+			}
+
+			prob_len = prob2 + LZMA_LEN_CHOICE;
+			num_bits = LZMA_LEN_NUM_LOW_BITS;
+			if (!rc_is_bit_1(rc, prob_len)) {
+				prob_len += LZMA_LEN_LOW - LZMA_LEN_CHOICE
+				            + (pos_state << LZMA_LEN_NUM_LOW_BITS);
+				offset = 0;
+			} else {
+				prob_len += LZMA_LEN_CHOICE_2 - LZMA_LEN_CHOICE;
+				if (!rc_is_bit_1(rc, prob_len)) {
+					prob_len += LZMA_LEN_MID - LZMA_LEN_CHOICE_2
+					            + (pos_state << LZMA_LEN_NUM_MID_BITS);
+					offset = 1 << LZMA_LEN_NUM_LOW_BITS;
+					num_bits += LZMA_LEN_NUM_MID_BITS - LZMA_LEN_NUM_LOW_BITS;
+				} else {
+					prob_len += LZMA_LEN_HIGH - LZMA_LEN_CHOICE_2;
+					offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
+					          + (1 << LZMA_LEN_NUM_MID_BITS));
+					num_bits += LZMA_LEN_NUM_HIGH_BITS - LZMA_LEN_NUM_LOW_BITS;
+				}
+			}
+			rc_bit_tree_decode(rc, prob_len, num_bits, &len);
+			len += offset;
+
+			if (state < 4) {
+				int pos_slot;
+				uint16_t *prob3;
+
+				state += LZMA_NUM_LIT_STATES;
+				prob3 = 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, prob3,
+					LZMA_NUM_POS_SLOT_BITS, &pos_slot);
+				rep0 = pos_slot;
+				if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
+					int i2, mi2, num_bits2 = (pos_slot >> 1) - 1;
+					rep0 = 2 | (pos_slot & 1);
+					if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
+						rep0 <<= num_bits2;
+						prob3 = p + LZMA_SPEC_POS + rep0 - pos_slot - 1;
+					} else {
+						for (; num_bits2 != LZMA_NUM_ALIGN_BITS; num_bits2--)
+							rep0 = (rep0 << 1) | rc_direct_bit(rc);
+						rep0 <<= LZMA_NUM_ALIGN_BITS;
+						prob3 = p + LZMA_ALIGN;
+					}
+					i2 = 1;
+					mi2 = 1;
+					while (num_bits2--) {
+						if (rc_get_bit(rc, prob3 + mi2, &mi2))
+							rep0 |= i2;
+						i2 <<= 1;
+					}
+				}
+				if (++rep0 == 0)
+					break;
+			}
+
+			len += LZMA_MATCH_MIN_LEN;
+ IF_NOT_FEATURE_LZMA_FAST(string:)
+			do {
+				uint32_t pos = buffer_pos - rep0;
+				while (pos >= header.dict_size)
+					pos += header.dict_size;
+				previous_byte = buffer[pos];
+ IF_NOT_FEATURE_LZMA_FAST(one_byte2:)
+				buffer[buffer_pos++] = previous_byte;
+				if (buffer_pos == header.dict_size) {
+					buffer_pos = 0;
+					global_pos += header.dict_size;
+					if (full_write(dst_fd, buffer, header.dict_size) != (ssize_t)header.dict_size)
+						goto bad;
+					IF_DESKTOP(total_written += header.dict_size;)
+				}
+				len--;
+			} while (len != 0 && buffer_pos < header.dst_size);
+		}
+	}
+
+	{
+		IF_NOT_DESKTOP(int total_written = 0; /* success */)
+		IF_DESKTOP(total_written += buffer_pos;)
+		if (full_write(dst_fd, buffer, buffer_pos) != (ssize_t)buffer_pos) {
+ bad:
+			total_written = -1; /* failure */
+		}
+		rc_free(rc);
+		free(p);
+		free(buffer);
+		return total_written;
+	}
+}