summaryrefslogtreecommitdiff
path: root/archival/libarchive/decompress_unlzma.c
diff options
context:
space:
mode:
authorDenys Vlasenko2010-11-03 02:38:31 +0100
committerDenys Vlasenko2010-11-03 02:38:31 +0100
commit833d4e7f84f59099ee66eabfa3457ebb7d37eaa8 (patch)
tree3be84e1049707ce8077291065fe3689497c69b9c /archival/libarchive/decompress_unlzma.c
parent5e9934028aa030312a1a2e2e32d5ceade8672beb (diff)
downloadbusybox-833d4e7f84f59099ee66eabfa3457ebb7d37eaa8.zip
busybox-833d4e7f84f59099ee66eabfa3457ebb7d37eaa8.tar.gz
rename archival/libunarchive -> archival/libarchive; move bz/ into it
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libarchive/decompress_unlzma.c')
-rw-r--r--archival/libarchive/decompress_unlzma.c465
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;
+ }
+}