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lzop.c
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lzop.c
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/*
This file is part of the lzop file compressor.
Copyright (C) 1996..2003 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
Markus F.X.J. Oberhumer <[email protected]>
http://www.oberhumer.com/opensource/lzop/
lzop and the LZO library are free software; you can redistribute them
and/or modify them under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"Minimalized" for busybox by Alain Knaff
*/
//config:config LZOP
//config: bool "lzop"
//config: default y
//config: help
//config: Lzop compression/decompresion.
//config:
//config:config UNLZOP
//config: bool "unlzop"
//config: default n # INCOMPAT: upstream lzop does not provide such tool
//config: help
//config: Lzop decompresion.
//config:
//config:config LZOPCAT
//config: bool "lzopcat"
//config: default n # INCOMPAT: upstream lzop does not provide such tool
//config: help
//config: Alias to "unlzop -c".
//config:
//config:config LZOP_COMPR_HIGH
//config: bool "lzop compression levels 7,8,9 (not very useful)"
//config: default n
//config: depends on LZOP || UNLZOP || LZOPCAT
//config: help
//config: High levels (7,8,9) of lzop compression. These levels
//config: are actually slower than gzip at equivalent compression ratios
//config: and take up 3.2K of code.
//applet:IF_LZOP(APPLET(lzop, BB_DIR_BIN, BB_SUID_DROP))
// APPLET_ODDNAME:name main location suid_type help
//applet:IF_UNLZOP( APPLET_ODDNAME(unlzop, lzop, BB_DIR_USR_BIN, BB_SUID_DROP, unlzop))
//applet:IF_LZOPCAT(APPLET_ODDNAME(lzopcat, lzop, BB_DIR_USR_BIN, BB_SUID_DROP, lzopcat))
//kbuild:lib-$(CONFIG_LZOP) += lzop.o
//kbuild:lib-$(CONFIG_UNLZOP) += lzop.o
//kbuild:lib-$(CONFIG_LZOPCAT) += lzop.o
//usage:#define lzop_trivial_usage
//usage: "[-cfUvd123456789CF] [FILE]..."
//usage:#define lzop_full_usage "\n\n"
//usage: " -1..9 Compression level"
//usage: "\n -d Decompress"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage: "\n -U Delete input files"
///////: "\n -k Keep input files" (default, so why bother documenting?)
//usage: "\n -v Verbose"
//usage: "\n -F Don't store or verify checksum"
//usage: "\n -C Also write checksum of compressed block"
//usage:
//usage:#define lzopcat_trivial_usage
//usage: "[-vF] [FILE]..."
//usage:#define lzopcat_full_usage "\n\n"
//usage: " -v Verbose"
//usage: "\n -F Don't verify checksum"
//usage:
//usage:#define unlzop_trivial_usage
//usage: "[-cfkvF] [FILE]..."
//usage:#define unlzop_full_usage "\n\n"
//usage: " -c Write to stdout"
//usage: "\n -f Force"
//usage: "\n -U Delete input files"
///////: "\n -k Keep input files" (default, so why bother documenting?)
//usage: "\n -v Verbose"
//usage: "\n -F Don't verify checksum"
#include "libbb.h"
#include "common_bufsiz.h"
#include "bb_archive.h"
#include "liblzo_interface.h"
/* lzo-2.03/src/lzo_ptr.h */
#define pd(a,b) ((unsigned)((a)-(b)))
#define lzo_version() LZO_VERSION
#define lzo_sizeof_dict_t (sizeof(uint8_t*))
/* lzo-2.03/include/lzo/lzo1x.h */
#define LZO1X_1_MEM_COMPRESS (16384 * lzo_sizeof_dict_t)
#define LZO1X_1_15_MEM_COMPRESS (32768 * lzo_sizeof_dict_t)
#define LZO1X_999_MEM_COMPRESS (14 * 16384 * sizeof(short))
/* lzo-2.03/src/lzo1x_oo.c */
#define NO_LIT UINT_MAX
/**********************************************************************/
static void copy2(uint8_t* ip, const uint8_t* m_pos, unsigned off)
{
ip[0] = m_pos[0];
if (off == 1)
ip[1] = m_pos[0];
else
ip[1] = m_pos[1];
}
static void copy3(uint8_t* ip, const uint8_t* m_pos, unsigned off)
{
ip[0] = m_pos[0];
if (off == 1) {
ip[2] = ip[1] = m_pos[0];
}
else if (off == 2) {
ip[1] = m_pos[1];
ip[2] = m_pos[0];
}
else {
ip[1] = m_pos[1];
ip[2] = m_pos[2];
}
}
/**********************************************************************/
// optimize a block of data.
/**********************************************************************/
#define TEST_IP (ip < ip_end)
#define TEST_OP (op <= op_end)
static NOINLINE int lzo1x_optimize(uint8_t *in, unsigned in_len,
uint8_t *out, unsigned *out_len,
void* wrkmem UNUSED_PARAM)
{
uint8_t* op;
uint8_t* ip;
unsigned t;
uint8_t* m_pos;
uint8_t* const ip_end = in + in_len;
uint8_t* const op_end = out + *out_len;
uint8_t* litp = NULL;
unsigned lit = 0;
unsigned next_lit = NO_LIT;
unsigned nl;
unsigned long o_m1_a = 0, o_m1_b = 0, o_m2 = 0, o_m3_a = 0, o_m3_b = 0;
// LZO_UNUSED(wrkmem);
*out_len = 0;
op = out;
ip = in;
if (*ip > 17) {
t = *ip++ - 17;
if (t < 4)
goto match_next;
goto first_literal_run;
}
while (TEST_IP && TEST_OP) {
t = *ip++;
if (t >= 16)
goto match;
/* a literal run */
litp = ip - 1;
if (t == 0) {
t = 15;
while (*ip == 0)
t += 255, ip++;
t += *ip++;
}
lit = t + 3;
/* copy literals */
copy_literal_run:
*op++ = *ip++;
*op++ = *ip++;
*op++ = *ip++;
first_literal_run:
do *op++ = *ip++; while (--t > 0);
t = *ip++;
if (t >= 16)
goto match;
#if defined(LZO1X)
m_pos = op - 1 - 0x800;
#elif defined(LZO1Y)
m_pos = op - 1 - 0x400;
#endif
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
*op++ = *m_pos++;
*op++ = *m_pos++;
*op++ = *m_pos++;
lit = 0;
goto match_done;
/* handle matches */
do {
if (t < 16) { /* a M1 match */
m_pos = op - 1;
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
if (litp == NULL)
goto copy_m1;
nl = ip[-2] & 3;
/* test if a match follows */
if (nl == 0 && lit == 1 && ip[0] >= 16) {
next_lit = nl;
/* adjust length of previous short run */
lit += 2;
*litp = (unsigned char)((*litp & ~3) | lit);
/* copy over the 2 literals that replace the match */
copy2(ip-2, m_pos, pd(op, m_pos));
o_m1_a++;
}
/* test if a literal run follows */
else
if (nl == 0
&& ip[0] < 16
&& ip[0] != 0
&& (lit + 2 + ip[0] < 16)
) {
t = *ip++;
/* remove short run */
*litp &= ~3;
/* copy over the 2 literals that replace the match */
copy2(ip-3+1, m_pos, pd(op, m_pos));
/* move literals 1 byte ahead */
litp += 2;
if (lit > 0)
memmove(litp+1, litp, lit);
/* insert new length of long literal run */
lit += 2 + t + 3;
*litp = (unsigned char)(lit - 3);
o_m1_b++;
*op++ = *m_pos++;
*op++ = *m_pos++;
goto copy_literal_run;
}
copy_m1:
*op++ = *m_pos++;
*op++ = *m_pos++;
} else {
match:
if (t >= 64) { /* a M2 match */
m_pos = op - 1;
#if defined(LZO1X)
m_pos -= (t >> 2) & 7;
m_pos -= *ip++ << 3;
t = (t >> 5) - 1;
#elif defined(LZO1Y)
m_pos -= (t >> 2) & 3;
m_pos -= *ip++ << 2;
t = (t >> 4) - 3;
#endif
if (litp == NULL)
goto copy_m;
nl = ip[-2] & 3;
/* test if in beetween two long literal runs */
if (t == 1 && lit > 3 && nl == 0
&& ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
) {
t = *ip++;
/* copy over the 3 literals that replace the match */
copy3(ip-1-2, m_pos, pd(op, m_pos));
/* set new length of previous literal run */
lit += 3 + t + 3;
*litp = (unsigned char)(lit - 3);
o_m2++;
*op++ = *m_pos++;
*op++ = *m_pos++;
*op++ = *m_pos++;
goto copy_literal_run;
}
} else {
if (t >= 32) { /* a M3 match */
t &= 31;
if (t == 0) {
t = 31;
while (*ip == 0)
t += 255, ip++;
t += *ip++;
}
m_pos = op - 1;
m_pos -= *ip++ >> 2;
m_pos -= *ip++ << 6;
} else { /* a M4 match */
m_pos = op;
m_pos -= (t & 8) << 11;
t &= 7;
if (t == 0) {
t = 7;
while (*ip == 0)
t += 255, ip++;
t += *ip++;
}
m_pos -= *ip++ >> 2;
m_pos -= *ip++ << 6;
if (m_pos == op)
goto eof_found;
m_pos -= 0x4000;
}
if (litp == NULL)
goto copy_m;
nl = ip[-2] & 3;
/* test if in beetween two matches */
if (t == 1 && lit == 0 && nl == 0 && ip[0] >= 16) {
next_lit = nl;
/* make a previous short run */
lit += 3;
*litp = (unsigned char)((*litp & ~3) | lit);
/* copy over the 3 literals that replace the match */
copy3(ip-3, m_pos, pd(op, m_pos));
o_m3_a++;
}
/* test if a literal run follows */
else if (t == 1 && lit <= 3 && nl == 0
&& ip[0] < 16 && ip[0] != 0 && (lit + 3 + ip[0] < 16)
) {
t = *ip++;
/* remove short run */
*litp &= ~3;
/* copy over the 3 literals that replace the match */
copy3(ip-4+1, m_pos, pd(op, m_pos));
/* move literals 1 byte ahead */
litp += 2;
if (lit > 0)
memmove(litp+1,litp,lit);
/* insert new length of long literal run */
lit += 3 + t + 3;
*litp = (unsigned char)(lit - 3);
o_m3_b++;
*op++ = *m_pos++;
*op++ = *m_pos++;
*op++ = *m_pos++;
goto copy_literal_run;
}
}
copy_m:
*op++ = *m_pos++;
*op++ = *m_pos++;
do *op++ = *m_pos++; while (--t > 0);
}
match_done:
if (next_lit == NO_LIT) {
t = ip[-2] & 3;
lit = t;
litp = ip - 2;
}
else
t = next_lit;
next_lit = NO_LIT;
if (t == 0)
break;
/* copy literals */
match_next:
do *op++ = *ip++; while (--t > 0);
t = *ip++;
} while (TEST_IP && TEST_OP);
}
/* no EOF code was found */
*out_len = pd(op, out);
return LZO_E_EOF_NOT_FOUND;
eof_found:
// LZO_UNUSED(o_m1_a); LZO_UNUSED(o_m1_b); LZO_UNUSED(o_m2);
// LZO_UNUSED(o_m3_a); LZO_UNUSED(o_m3_b);
*out_len = pd(op, out);
return (ip == ip_end ? LZO_E_OK :
(ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
}
/**********************************************************************/
#define F_OS F_OS_UNIX
#define F_CS F_CS_NATIVE
/**********************************************************************/
#define ADLER32_INIT_VALUE 1
#define CRC32_INIT_VALUE 0
/**********************************************************************/
enum {
M_LZO1X_1 = 1,
M_LZO1X_1_15 = 2,
M_LZO1X_999 = 3,
};
/**********************************************************************/
/* header flags */
#define F_ADLER32_D 0x00000001L
#define F_ADLER32_C 0x00000002L
#define F_H_EXTRA_FIELD 0x00000040L
#define F_H_GMTDIFF 0x00000080L
#define F_CRC32_D 0x00000100L
#define F_CRC32_C 0x00000200L
#define F_H_FILTER 0x00000800L
#define F_H_CRC32 0x00001000L
#define F_MASK 0x00003FFFL
/* operating system & file system that created the file [mostly unused] */
#define F_OS_UNIX 0x03000000L
#define F_OS_SHIFT 24
#define F_OS_MASK 0xff000000L
/* character set for file name encoding [mostly unused] */
#define F_CS_NATIVE 0x00000000L
#define F_CS_SHIFT 20
#define F_CS_MASK 0x00f00000L
/* these bits must be zero */
#define F_RESERVED ((F_MASK | F_OS_MASK | F_CS_MASK) ^ 0xffffffffL)
typedef struct chksum_t {
uint32_t f_adler32;
uint32_t f_crc32;
} chksum_t;
typedef struct header_t {
unsigned version;
unsigned lib_version;
unsigned version_needed_to_extract;
uint32_t flags;
uint32_t mode;
uint32_t mtime;
uint32_t gmtdiff;
uint32_t header_checksum;
uint32_t extra_field_len;
uint32_t extra_field_checksum;
unsigned char method;
unsigned char level;
/* info */
char name[255+1];
} header_t;
struct globals {
/*const uint32_t *lzo_crc32_table;*/
chksum_t chksum_in;
chksum_t chksum_out;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
//#define G (*ptr_to_globals)
//#define INIT_G() do {
// SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
//} while (0)
/**********************************************************************/
#define LZOP_VERSION 0x1010
//#define LZOP_VERSION_STRING "1.01"
//#define LZOP_VERSION_DATE "Apr 27th 2003"
// lzop wants to be weird:
// unlike all other compressosrs, its -k "keep" option is the default,
// and -U is used to delete the source. We will invert the bit after getopt().
#define OPTION_STRING "cfUvqdt123456789CFk"
/* Note: must be kept in sync with archival/bbunzip.c */
enum {
OPT_STDOUT = (1 << 0),
OPT_FORCE = (1 << 1),
OPT_KEEP = (1 << 2),
OPT_VERBOSE = (1 << 3),
OPT_QUIET = (1 << 4),
OPT_DECOMPRESS = (1 << 5),
OPT_TEST = (1 << 6),
OPT_1 = (1 << 7),
OPT_2 = (1 << 8),
OPT_3 = (1 << 9),
OPT_4 = (1 << 10),
OPT_5 = (1 << 11),
OPT_6 = (1 << 12),
OPT_7 = (1 << 13),
OPT_8 = (1 << 14),
OPT_9 = (1 << 15),
OPT_C = (1 << 16),
OPT_F = (1 << 17),
OPT_k = (1 << 18),
OPT_789 = OPT_7 | OPT_8 | OPT_9
};
/**********************************************************************/
// adler32 checksum
// adapted from free code by Mark Adler <[email protected]>
// see http://www.zlib.org/
/**********************************************************************/
static FAST_FUNC uint32_t
lzo_adler32(uint32_t adler, const uint8_t* buf, unsigned len)
{
enum {
LZO_BASE = 65521, /* largest prime smaller than 65536 */
/* NMAX is the largest n such that
* 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
LZO_NMAX = 5552,
};
uint32_t s1 = adler & 0xffff;
uint32_t s2 = (adler >> 16) & 0xffff;
unsigned k;
if (buf == NULL)
return 1;
while (len > 0) {
k = len < LZO_NMAX ? (unsigned) len : LZO_NMAX;
len -= k;
if (k != 0) do {
s1 += *buf++;
s2 += s1;
} while (--k > 0);
s1 %= LZO_BASE;
s2 %= LZO_BASE;
}
return (s2 << 16) | s1;
}
static FAST_FUNC uint32_t
lzo_crc32(uint32_t c, const uint8_t* buf, unsigned len)
{
//if (buf == NULL) - impossible
// return 0;
return ~crc32_block_endian0(~c, buf, len, global_crc32_table);
}
/**********************************************************************/
static void init_chksum(chksum_t *ct)
{
ct->f_adler32 = ADLER32_INIT_VALUE;
ct->f_crc32 = CRC32_INIT_VALUE;
}
static void add_bytes_to_chksum(chksum_t *ct, const void* buf, int cnt)
{
/* We need to handle the two checksums at once, because at the
* beginning of the header, we don't know yet which one we'll
* eventually need */
ct->f_adler32 = lzo_adler32(ct->f_adler32, (const uint8_t*)buf, cnt);
ct->f_crc32 = lzo_crc32(ct->f_crc32, (const uint8_t*)buf, cnt);
}
static uint32_t chksum_getresult(chksum_t *ct, const header_t *h)
{
return (h->flags & F_H_CRC32) ? ct->f_crc32 : ct->f_adler32;
}
/**********************************************************************/
static uint32_t read32(void)
{
uint32_t v;
xread(0, &v, 4);
return ntohl(v);
}
static void write32(uint32_t v)
{
v = htonl(v);
xwrite(1, &v, 4);
}
static void f_write(const void* buf, int cnt)
{
xwrite(1, buf, cnt);
add_bytes_to_chksum(&G.chksum_out, buf, cnt);
}
static void f_read(void* buf, int cnt)
{
xread(0, buf, cnt);
add_bytes_to_chksum(&G.chksum_in, buf, cnt);
}
static int f_read8(void)
{
uint8_t v;
f_read(&v, 1);
return v;
}
static void f_write8(uint8_t v)
{
f_write(&v, 1);
}
static unsigned f_read16(void)
{
uint16_t v;
f_read(&v, 2);
return ntohs(v);
}
static void f_write16(uint16_t v)
{
v = htons(v);
f_write(&v, 2);
}
static uint32_t f_read32(void)
{
uint32_t v;
f_read(&v, 4);
return ntohl(v);
}
static void f_write32(uint32_t v)
{
v = htonl(v);
f_write(&v, 4);
}
/**********************************************************************/
static int lzo_get_method(header_t *h)
{
/* check method */
if (h->method == M_LZO1X_1) {
if (h->level == 0)
h->level = 3;
} else if (h->method == M_LZO1X_1_15) {
if (h->level == 0)
h->level = 1;
} else if (h->method == M_LZO1X_999) {
if (h->level == 0)
h->level = 9;
} else
return -1; /* not a LZO method */
/* check compression level */
if (h->level < 1 || h->level > 9)
return 15;
return 0;
}
/**********************************************************************/
#define LZO_BLOCK_SIZE (256 * 1024l)
#define MAX_BLOCK_SIZE (64 * 1024l * 1024l) /* DO NOT CHANGE */
/* LZO may expand uncompressible data by a small amount */
#define MAX_COMPRESSED_SIZE(x) ((x) + (x) / 16 + 64 + 3)
/**********************************************************************/
// compress a file
/**********************************************************************/
static NOINLINE int lzo_compress(const header_t *h)
{
unsigned block_size = LZO_BLOCK_SIZE;
int r = 0; /* LZO_E_OK */
uint8_t *const b1 = xzalloc(block_size);
uint8_t *const b2 = xzalloc(MAX_COMPRESSED_SIZE(block_size));
unsigned src_len = 0, dst_len = 0;
uint32_t d_adler32 = ADLER32_INIT_VALUE;
uint32_t d_crc32 = CRC32_INIT_VALUE;
int l;
uint8_t *wrk_mem = NULL;
if (h->method == M_LZO1X_1)
wrk_mem = xzalloc(LZO1X_1_MEM_COMPRESS);
else if (h->method == M_LZO1X_1_15)
wrk_mem = xzalloc(LZO1X_1_15_MEM_COMPRESS);
else if (h->method == M_LZO1X_999)
wrk_mem = xzalloc(LZO1X_999_MEM_COMPRESS);
for (;;) {
/* read a block */
l = full_read(0, b1, block_size);
src_len = (l > 0 ? l : 0);
/* write uncompressed block size */
write32(src_len);
/* exit if last block */
if (src_len == 0)
break;
/* compute checksum of uncompressed block */
if (h->flags & F_ADLER32_D)
d_adler32 = lzo_adler32(ADLER32_INIT_VALUE, b1, src_len);
if (h->flags & F_CRC32_D)
d_crc32 = lzo_crc32(CRC32_INIT_VALUE, b1, src_len);
/* compress */
if (h->method == M_LZO1X_1)
r = lzo1x_1_compress(b1, src_len, b2, &dst_len, wrk_mem);
else if (h->method == M_LZO1X_1_15)
r = lzo1x_1_15_compress(b1, src_len, b2, &dst_len, wrk_mem);
#if ENABLE_LZOP_COMPR_HIGH
else if (h->method == M_LZO1X_999)
r = lzo1x_999_compress_level(b1, src_len, b2, &dst_len,
wrk_mem, h->level);
#endif
else
bb_error_msg_and_die("internal error");
if (r != 0) /* not LZO_E_OK */
bb_error_msg_and_die("internal error - compression failed");
/* write compressed block size */
if (dst_len < src_len) {
/* optimize */
if (h->method == M_LZO1X_999) {
unsigned new_len = src_len;
r = lzo1x_optimize(b2, dst_len, b1, &new_len, NULL);
if (r != 0 /*LZO_E_OK*/ || new_len != src_len)
bb_error_msg_and_die("internal error - optimization failed");
}
write32(dst_len);
} else {
/* data actually expanded => store data uncompressed */
write32(src_len);
}
/* write checksum of uncompressed block */
if (h->flags & F_ADLER32_D)
write32(d_adler32);
if (h->flags & F_CRC32_D)
write32(d_crc32);
if (dst_len < src_len) {
/* write checksum of compressed block */
if (h->flags & F_ADLER32_C)
write32(lzo_adler32(ADLER32_INIT_VALUE, b2, dst_len));
if (h->flags & F_CRC32_C)
write32(lzo_crc32(CRC32_INIT_VALUE, b2, dst_len));
/* write compressed block data */
xwrite(1, b2, dst_len);
} else {
/* write uncompressed block data */
xwrite(1, b1, src_len);
}
}
free(wrk_mem);
free(b1);
free(b2);
return 1;
}
static FAST_FUNC void lzo_check(
uint32_t init,
uint8_t* buf, unsigned len,
uint32_t FAST_FUNC (*fn)(uint32_t, const uint8_t*, unsigned),
uint32_t ref)
{
/* This function, by having the same order of parameters
* as fn, and by being marked FAST_FUNC (same as fn),
* saves a dozen bytes of code.
*/
uint32_t c = fn(init, buf, len);
if (c != ref)
bb_error_msg_and_die("checksum error");
}
/**********************************************************************/
// decompress a file
/**********************************************************************/
static NOINLINE int lzo_decompress(const header_t *h)
{
unsigned block_size = LZO_BLOCK_SIZE;
int r;
uint32_t src_len, dst_len;
uint32_t c_adler32 = ADLER32_INIT_VALUE;
uint32_t d_adler32 = ADLER32_INIT_VALUE;
uint32_t c_crc32 = CRC32_INIT_VALUE, d_crc32 = CRC32_INIT_VALUE;
uint8_t *b1;
uint32_t mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
uint8_t *b2 = NULL;
for (;;) {
uint8_t *dst;
/* read uncompressed block size */
dst_len = read32();
/* exit if last block */
if (dst_len == 0)
break;
/* error if split file */
if (dst_len == 0xffffffffL)
/* should not happen - not yet implemented */
bb_error_msg_and_die("this file is a split lzop file");
if (dst_len > MAX_BLOCK_SIZE)
bb_error_msg_and_die("corrupted data");
/* read compressed block size */
src_len = read32();
if (src_len <= 0 || src_len > dst_len)
bb_error_msg_and_die("corrupted data");
if (dst_len > block_size) {
if (b2) {
free(b2);
b2 = NULL;
}
block_size = dst_len;
mcs_block_size = MAX_COMPRESSED_SIZE(block_size);
}
/* read checksum of uncompressed block */
if (h->flags & F_ADLER32_D)
d_adler32 = read32();
if (h->flags & F_CRC32_D)
d_crc32 = read32();
/* read checksum of compressed block */
if (src_len < dst_len) {
if (h->flags & F_ADLER32_C)
c_adler32 = read32();
if (h->flags & F_CRC32_C)
c_crc32 = read32();
}
if (b2 == NULL)
b2 = xzalloc(mcs_block_size);
/* read the block into the end of our buffer */
b1 = b2 + mcs_block_size - src_len;
xread(0, b1, src_len);
if (src_len < dst_len) {
unsigned d = dst_len;
if (!(option_mask32 & OPT_F)) {
/* verify checksum of compressed block */
if (h->flags & F_ADLER32_C)
lzo_check(ADLER32_INIT_VALUE,
b1, src_len,
lzo_adler32, c_adler32);
if (h->flags & F_CRC32_C)
lzo_check(CRC32_INIT_VALUE,
b1, src_len,
lzo_crc32, c_crc32);
}
/* decompress */
// if (option_mask32 & OPT_F)
// r = lzo1x_decompress(b1, src_len, b2, &d, NULL);
// else
r = lzo1x_decompress_safe(b1, src_len, b2, &d, NULL);
if (r != 0 /*LZO_E_OK*/ || dst_len != d) {
bb_error_msg_and_die("corrupted data");
}
dst = b2;
} else {
/* "stored" block => no decompression */
dst = b1;
}
if (!(option_mask32 & OPT_F)) {
/* verify checksum of uncompressed block */
if (h->flags & F_ADLER32_D)
lzo_check(ADLER32_INIT_VALUE,
dst, dst_len,
lzo_adler32, d_adler32);
if (h->flags & F_CRC32_D)
lzo_check(CRC32_INIT_VALUE,
dst, dst_len,
lzo_crc32, d_crc32);
}
/* write uncompressed block data */
xwrite(1, dst, dst_len);
}
free(b2);
return 1;
}
/**********************************************************************/
// lzop file signature (shamelessly borrowed from PNG)
/**********************************************************************/
/*
* The first nine bytes of a lzop file always contain the following values:
*
* 0 1 2 3 4 5 6 7 8
* --- --- --- --- --- --- --- --- ---
* (hex) 89 4c 5a 4f 00 0d 0a 1a 0a
* (decimal) 137 76 90 79 0 13 10 26 10
* (C notation - ASCII) \211 L Z O \0 \r \n \032 \n
*/
/* (vda) comparison with lzop v1.02rc1 ("lzop -1 <FILE" cmd):
* Only slight differences in header:
* -00000000 89 4c 5a 4f 00 0d 0a 1a 0a 10 20 20 20 09 40 02
* +00000000 89 4c 5a 4f 00 0d 0a 1a 0a 10 10 20 30 09 40 02
* ^^^^^ ^^^^^
* version lib_version
* -00000010 01 03 00 00 0d 00 00 81 a4 49 f7 a6 3f 00 00 00
* +00000010 01 03 00 00 01 00 00 00 00 00 00 00 00 00 00 00
* ^^^^^^^^^^^ ^^^^^^^^^^^ ^^^^^^^^^^^
* flags mode mtime
* -00000020 00 00 2d 67 04 17 00 04 00 00 00 03 ed ec 9d 6d
* +00000020 00 00 10 5f 00 c1 00 04 00 00 00 03 ed ec 9d 6d
* ^^^^^^^^^^^
* chksum_out
* The rest is identical.
*/
static const unsigned char lzop_magic[9] ALIGN1 = {
0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
};
/* This coding is derived from Alexander Lehmann's pngcheck code. */
static void check_magic(void)
{
unsigned char magic[sizeof(lzop_magic)];
xread(0, magic, sizeof(magic));
if (memcmp(magic, lzop_magic, sizeof(lzop_magic)) != 0)
bb_error_msg_and_die("bad magic number");
}
/**********************************************************************/
// lzop file header
/**********************************************************************/
static void write_header(const header_t *h)
{
int l;
xwrite(1, lzop_magic, sizeof(lzop_magic));
init_chksum(&G.chksum_out);
f_write16(h->version);
f_write16(h->lib_version);
f_write16(h->version_needed_to_extract);
f_write8(h->method);
f_write8(h->level);
f_write32(h->flags);
f_write32(h->mode);
f_write32(h->mtime);
f_write32(h->gmtdiff);
l = (int) strlen(h->name);
f_write8(l);
if (l)
f_write(h->name, l);
f_write32(chksum_getresult(&G.chksum_out, h));
}
static int read_header(header_t *h)
{
int r;
int l;
uint32_t checksum;
memset(h, 0, sizeof(*h));
h->version_needed_to_extract = 0x0900; /* first lzop version */
h->level = 0;
init_chksum(&G.chksum_in);
h->version = f_read16();
if (h->version < 0x0900)
return 3;
h->lib_version = f_read16();
if (h->version >= 0x0940) {
h->version_needed_to_extract = f_read16();
if (h->version_needed_to_extract > LZOP_VERSION)
return 16;
if (h->version_needed_to_extract < 0x0900)
return 3;
}
h->method = f_read8();
if (h->version >= 0x0940)
h->level = f_read8();
h->flags = f_read32();
if (h->flags & F_H_FILTER)
return 16; /* filter not supported */
h->mode = f_read32();
h->mtime = f_read32();
if (h->version >= 0x0940)
h->gmtdiff = f_read32();
l = f_read8();