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xNBA/src/util/nrv2b.c
Michael Brown 3d6123e69a Initial revision
2005-03-08 18:53:11 +00:00

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/**************************************************************
Form adapted from lzhuf.c
written by Haruyasu Yoshizaki 11/20/1988
some minor changes 4/6/1989
comments translated by Haruhiko Okumura 4/7/1989
minor beautifications and adjustments for compiling under Linux
by Markus Gutschke <gutschk@math.uni-muenster.de>
1997-01-27
Modifications to allow use as a filter by Ken Yap
<ken_yap@users.sourceforge.net>.
1997-07-01
Small mod to cope with running on big-endian machines
by Jim Hague <jim.hague@acm.org)
1998-02-06
Make compression statistics report shorter
by Ken Yap <ken_yap@users.sourceforge.net>.
2001-04-25
Replaced algorithm with nrv2b from ucl the compression
library from upx. That code is:
Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
And is distributed under the terms of the GPL.
The conversion was performed
by Eric Biederman <ebiederman@lnxi.com>.
20 August 2002
**************************************************************/
#define UCLPACK_COMPAT 0
#define NDEBUG 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#ifdef __FreeBSD__
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#include <limits.h>
#include <assert.h>
#if UCLPACK_COMPAT
#include <netinet/in.h>
#endif
#ifndef VERBOSE
#define Fprintf(x)
#define wterr 0
#else
#define Fprintf(x) fprintf x
#endif
#ifndef MAIN
extern
#endif
FILE *infile, *outfile;
#if defined(ENCODE) || defined(DECODE)
#ifndef ENDIAN
#define ENDIAN 0
#endif
#ifndef BITSIZE
#define BITSIZE 32
#endif
static __inline__ void Error(char *message)
{
Fprintf((stderr, "\n%s\n", message));
exit(EXIT_FAILURE);
}
/* These will be a complete waste of time on a lo-endian */
/* system, but it only gets done once so WTF. */
static unsigned long i86ul_to_host(unsigned long ul)
{
unsigned long res = 0;
int i;
union
{
unsigned char c[4];
unsigned long ul;
} u;
u.ul = ul;
for (i = 3; i >= 0; i--)
res = (res << 8) + u.c[i];
return res;
}
static unsigned long host_to_i86ul(unsigned long ul)
{
int i;
union
{
unsigned char c[4];
unsigned long ul;
} u;
for (i = 0; i < 4; i++)
{
u.c[i] = ul & 0xff;
ul >>= 8;
}
return u.ul;
}
#endif
#if UCLPACK_COMPAT
/* magic file header for compressed files */
static const unsigned char magic[8] =
{ 0x00, 0xe9, 0x55, 0x43, 0x4c, 0xff, 0x01, 0x1a };
#endif
#ifdef ENCODE
/********** NRV2B_99 compression **********/
/* Note by limiting the ring buffer I have limited the maximum
* offset to 64K. Since etherboot rarely gets that big it
* is not a problem and it gives me a firm guarantee
* that I will never get a 3 byte string match that is encodes
* to more than 9/8 it's original size.
* That guaranteee is important to for the inplace decompressor.
* There are better ways to do this if a larger offset and buffer
* would give better compression.
*/
#define N (65536ul) /* size of ring buffer */
#define THRESHOLD 1 /* lower limit for match length */
#define F 2048 /* upper limit for match length */
#define M2_MAX_OFFSET 0xd00
/* note: to use default values pass -1, i.e. initialize
* this struct by a memset(x,0xff,sizeof(x)) */
struct ucl_compress_config
{
int bb_endian;
int bb_size;
unsigned int max_offset;
unsigned int max_match;
int s_level;
int h_level;
int p_level;
int c_flags;
unsigned int m_size;
};
struct ucl_compress
{
int init;
unsigned int look; /* bytes in lookahead buffer */
unsigned int m_len;
unsigned int m_off;
unsigned int last_m_len;
unsigned int last_m_off;
const unsigned char *bp;
const unsigned char *ip;
const unsigned char *in;
const unsigned char *in_end;
unsigned char *out;
uint64_t bb_b;
unsigned bb_k;
unsigned bb_c_endian;
unsigned bb_c_s;
unsigned bb_c_s8;
unsigned char *bb_p;
unsigned char *bb_op;
struct ucl_compress_config conf;
unsigned int *result;
unsigned int textsize; /* text size counter */
unsigned int codesize; /* code size counter */
unsigned int printcount; /* counter for reporting progress every 1K
bytes */
/* some stats */
unsigned long lit_bytes;
unsigned long match_bytes;
unsigned long rep_bytes;
unsigned long lazy;
};
#define getbyte(c) ((c).ip < (c).in_end ? *((c).ip)++ : (-1))
#define UCL_E_OK 0
#define UCL_E_INVALID_ARGUMENT 1
#define UCL_E_OUT_OF_MEMORY 2
#define UCL_E_ERROR 3
/***********************************************************************
//
************************************************************************/
#define SWD_HSIZE 16384
#define SWD_MAX_CHAIN 2048
#define SWD_BEST_OFF 1
#define HEAD3(b,p) \
(((0x9f5f*(((((uint32_t)b[p]<<5)^b[p+1])<<5)^b[p+2]))>>5) & (SWD_HSIZE-1))
#define HEAD2(b,p) (b[p] ^ ((unsigned)b[p+1]<<8))
#define NIL2 UINT_MAX
struct ucl_swd
{
/* public - "built-in" */
unsigned int n;
unsigned int f;
unsigned int threshold;
/* public - configuration */
unsigned int max_chain;
unsigned int nice_length;
int use_best_off;
unsigned int lazy_insert;
/* public - output */
unsigned int m_len;
unsigned int m_off;
unsigned int look;
int b_char;
#if defined(SWD_BEST_OFF)
unsigned int best_off[ SWD_BEST_OFF ];
#endif
/* semi public */
struct ucl_compress *c;
unsigned int m_pos;
#if defined(SWD_BEST_OFF)
unsigned int best_pos[ SWD_BEST_OFF ];
#endif
/* private */
const uint8_t *dict;
const uint8_t *dict_end;
unsigned int dict_len;
/* private */
unsigned int ip; /* input pointer (lookahead) */
unsigned int bp; /* buffer pointer */
unsigned int rp; /* remove pointer */
unsigned int b_size;
unsigned char *b_wrap;
unsigned int node_count;
unsigned int first_rp;
unsigned char b [ N + F + F ];
unsigned int head3 [ SWD_HSIZE ];
unsigned int succ3 [ N + F ];
unsigned int best3 [ N + F ];
unsigned int llen3 [ SWD_HSIZE ];
unsigned int head2 [ 65536U ];
};
#define s_head3(s,key) s->head3[key]
#if !defined( NDEBUG)
static void assert_match(const struct ucl_swd * swd, unsigned int m_len,
unsigned int m_off )
{
const struct ucl_compress *c = swd->c;
unsigned int d_off;
assert(m_len >= 2);
if (m_off <= (unsigned int) (c->bp - c->in))
{
assert(c->bp - m_off + m_len < c->ip);
assert(memcmp(c->bp, c->bp - m_off, m_len) == 0);
}
else
{
assert(swd->dict != NULL);
d_off = m_off - (unsigned int) (c->bp - c->in);
assert(d_off <= swd->dict_len);
if (m_len > d_off)
{
assert(memcmp(c->bp, swd->dict_end - d_off, d_off) ==
0);
assert(c->in + m_len - d_off < c->ip);
assert(memcmp(c->bp + d_off, c->in, m_len - d_off) ==
0);
}
else
{
assert(memcmp(c->bp, swd->dict_end - d_off, m_len) ==
0);
}
}
}
#else
# define assert_match(a,b,c) ((void)0)
#endif
/***********************************************************************
//
************************************************************************/
static
void swd_initdict(struct ucl_swd *s, const uint8_t *dict, unsigned int dict_len)
{
s->dict = s->dict_end = NULL;
s->dict_len = 0;
if (!dict || dict_len <= 0)
return;
if (dict_len > s->n)
{
dict += dict_len - s->n;
dict_len = s->n;
}
s->dict = dict;
s->dict_len = dict_len;
s->dict_end = dict + dict_len;
memcpy(s->b,dict,dict_len);
s->ip = dict_len;
}
static
void swd_insertdict(struct ucl_swd *s, unsigned int node, unsigned int len)
{
unsigned int key;
s->node_count = s->n - len;
s->first_rp = node;
while (len-- > 0)
{
key = HEAD3(s->b,node);
s->succ3[node] = s_head3(s,key);
s->head3[key] = (unsigned int)(node);
s->best3[node] = (unsigned int)(s->f + 1);
s->llen3[key]++;
assert(s->llen3[key] <= s->n);
key = HEAD2(s->b,node);
s->head2[key] = (unsigned int)(node);
node++;
}
}
/***********************************************************************
//
************************************************************************/
static
int swd_init(struct ucl_swd *s, const uint8_t *dict, unsigned int dict_len)
{
unsigned int i = 0;
int c = 0;
if (s->n == 0)
s->n = N;
if (s->f == 0)
s->f = F;
s->threshold = THRESHOLD;
if (s->n > N || s->f > F)
return UCL_E_INVALID_ARGUMENT;
/* defaults */
s->max_chain = SWD_MAX_CHAIN;
s->nice_length = s->f;
s->use_best_off = 0;
s->lazy_insert = 0;
s->b_size = s->n + s->f;
if (s->b_size + s->f >= UINT_MAX)
return UCL_E_ERROR;
s->b_wrap = s->b + s->b_size;
s->node_count = s->n;
memset(s->llen3, 0, sizeof(s->llen3[0]) * SWD_HSIZE);
for (i = 0; i < 65536U; i++)
s->head2[i] = NIL2;
s->ip = 0;
swd_initdict(s,dict,dict_len);
s->bp = s->ip;
s->first_rp = s->ip;
assert(s->ip + s->f <= s->b_size);
s->look = (unsigned int) (s->c->in_end - s->c->ip);
if (s->look > 0)
{
if (s->look > s->f)
s->look = s->f;
memcpy(&s->b[s->ip],s->c->ip,s->look);
s->c->ip += s->look;
s->ip += s->look;
}
if (s->ip == s->b_size)
s->ip = 0;
if (s->look >= 2 && s->dict_len > 0)
swd_insertdict(s,0,s->dict_len);
s->rp = s->first_rp;
if (s->rp >= s->node_count)
s->rp -= s->node_count;
else
s->rp += s->b_size - s->node_count;
/* unused i */
/* unused c */
return UCL_E_OK;
}
static
void swd_exit(struct ucl_swd *s)
{
/* unused s */
}
#define swd_pos2off(s,pos) \
(s->bp > (pos) ? s->bp - (pos) : s->b_size - ((pos) - s->bp))
/***********************************************************************
//
************************************************************************/
static __inline__
void swd_getbyte(struct ucl_swd *s)
{
int c;
if ((c = getbyte(*(s->c))) < 0)
{
if (s->look > 0)
--s->look;
}
else
{
s->b[s->ip] = (uint8_t)(c);
if (s->ip < s->f)
s->b_wrap[s->ip] = (uint8_t)(c);
}
if (++s->ip == s->b_size)
s->ip = 0;
if (++s->bp == s->b_size)
s->bp = 0;
if (++s->rp == s->b_size)
s->rp = 0;
}
/***********************************************************************
// remove node from lists
************************************************************************/
static __inline__
void swd_remove_node(struct ucl_swd *s, unsigned int node)
{
if (s->node_count == 0)
{
unsigned int key;
#ifdef UCL_DEBUG
if (s->first_rp != UINT_MAX)
{
if (node != s->first_rp)
printf("Remove %5d: %5d %5d %5d %5d %6d %6d\n",
node, s->rp, s->ip, s->bp, s->first_rp,
s->ip - node, s->ip - s->bp);
assert(node == s->first_rp);
s->first_rp = UINT_MAX;
}
#endif
key = HEAD3(s->b,node);
assert(s->llen3[key] > 0);
--s->llen3[key];
key = HEAD2(s->b,node);
assert(s->head2[key] != NIL2);
if ((unsigned int) s->head2[key] == node)
s->head2[key] = NIL2;
}
else
--s->node_count;
}
/***********************************************************************
//
************************************************************************/
static
void swd_accept(struct ucl_swd *s, unsigned int n)
{
assert(n <= s->look);
if (n > 0) do
{
unsigned int key;
swd_remove_node(s,s->rp);
/* add bp into HEAD3 */
key = HEAD3(s->b,s->bp);
s->succ3[s->bp] = s_head3(s,key);
s->head3[key] = (unsigned int)(s->bp);
s->best3[s->bp] = (unsigned int)(s->f + 1);
s->llen3[key]++;
assert(s->llen3[key] <= s->n);
/* add bp into HEAD2 */
key = HEAD2(s->b,s->bp);
s->head2[key] = (unsigned int)(s->bp);
swd_getbyte(s);
} while (--n > 0);
}
/***********************************************************************
//
************************************************************************/
static
void swd_search(struct ucl_swd *s, unsigned int node, unsigned int cnt)
{
const unsigned char *p1;
const unsigned char *p2;
const unsigned char *px;
unsigned int m_len = s->m_len;
const unsigned char * b = s->b;
const unsigned char * bp = s->b + s->bp;
const unsigned char * bx = s->b + s->bp + s->look;
unsigned char scan_end1;
assert(s->m_len > 0);
scan_end1 = bp[m_len - 1];
for ( ; cnt-- > 0; node = s->succ3[node])
{
p1 = bp;
p2 = b + node;
px = bx;
assert(m_len < s->look);
if (
p2[m_len - 1] == scan_end1 &&
p2[m_len] == p1[m_len] &&
p2[0] == p1[0] &&
p2[1] == p1[1])
{
unsigned int i;
assert(memcmp(bp,&b[node],3) == 0);
p1 += 2; p2 += 2;
do {} while (++p1 < px && *p1 == *++p2);
i = p1 - bp;
#ifdef UCL_DEBUG
if (memcmp(bp,&b[node],i) != 0)
printf("%5ld %5ld %02x%02x %02x%02x\n",
(long)s->bp, (long) node,
bp[0], bp[1], b[node], b[node+1]);
#endif
assert(memcmp(bp,&b[node],i) == 0);
#if defined(SWD_BEST_OFF)
if (i < SWD_BEST_OFF)
{
if (s->best_pos[i] == 0)
s->best_pos[i] = node + 1;
}
#endif
if (i > m_len)
{
s->m_len = m_len = i;
s->m_pos = node;
if (m_len == s->look)
return;
if (m_len >= s->nice_length)
return;
if (m_len > (unsigned int) s->best3[node])
return;
scan_end1 = bp[m_len - 1];
}
}
}
}
static int swd_search2(struct ucl_swd *s)
{
unsigned int key;
assert(s->look >= 2);
assert(s->m_len > 0);
key = s->head2[ HEAD2(s->b,s->bp) ];
if (key == NIL2)
return 0;
#ifdef UCL_DEBUG
if (memcmp(&s->b[s->bp],&s->b[key],2) != 0)
printf("%5ld %5ld %02x%02x %02x%02x\n", (long)s->bp, (long)key,
s->b[s->bp], s->b[s->bp+1], s->b[key], s->b[key+1]);
#endif
assert(memcmp(&s->b[s->bp],&s->b[key],2) == 0);
#if defined(SWD_BEST_OFF)
if (s->best_pos[2] == 0)
s->best_pos[2] = key + 1;
#endif
if (s->m_len < 2)
{
s->m_len = 2;
s->m_pos = key;
}
return 1;
}
/***********************************************************************
//
************************************************************************/
static
void swd_findbest(struct ucl_swd *s)
{
unsigned int key;
unsigned int cnt, node;
unsigned int len;
assert(s->m_len > 0);
/* get current head, add bp into HEAD3 */
key = HEAD3(s->b,s->bp);
node = s->succ3[s->bp] = s_head3(s,key);
cnt = s->llen3[key]++;
assert(s->llen3[key] <= s->n + s->f);
if (cnt > s->max_chain && s->max_chain > 0)
cnt = s->max_chain;
s->head3[key] = (unsigned int)(s->bp);
s->b_char = s->b[s->bp];
len = s->m_len;
if (s->m_len >= s->look)
{
if (s->look == 0)
s->b_char = -1;
s->m_off = 0;
s->best3[s->bp] = (unsigned int)(s->f + 1);
}
else
{
if (swd_search2(s))
if (s->look >= 3)
swd_search(s,node,cnt);
if (s->m_len > len)
s->m_off = swd_pos2off(s,s->m_pos);
s->best3[s->bp] = (unsigned int)(s->m_len);
#if defined(SWD_BEST_OFF)
if (s->use_best_off)
{
int i;
for (i = 2; i < SWD_BEST_OFF; i++)
if (s->best_pos[i] > 0)
s->best_off[i] =
swd_pos2off(s,s->best_pos[i]-1);
else
s->best_off[i] = 0;
}
#endif
}
swd_remove_node(s,s->rp);
/* add bp into HEAD2 */
key = HEAD2(s->b,s->bp);
s->head2[key] = (unsigned int)(s->bp);
}
/***********************************************************************
//
************************************************************************/
static int
init_match ( struct ucl_compress *c, struct ucl_swd *s,
const uint8_t *dict, unsigned int dict_len,
uint32_t flags )
{
int r;
assert(!c->init);
c->init = 1;
s->c = c;
c->last_m_len = c->last_m_off = 0;
c->textsize = c->codesize = c->printcount = 0;
c->lit_bytes = c->match_bytes = c->rep_bytes = 0;
c->lazy = 0;
r = swd_init(s,dict,dict_len);
if (r != UCL_E_OK)
{
swd_exit(s);
return r;
}
s->use_best_off = (flags & 1) ? 1 : 0;
return UCL_E_OK;
}
static int
find_match ( struct ucl_compress *c, struct ucl_swd *s,
unsigned int this_len, unsigned int skip )
{
assert(c->init);
if (skip > 0)
{
assert(this_len >= skip);
swd_accept(s, this_len - skip);
c->textsize += this_len - skip + 1;
}
else
{
assert(this_len <= 1);
c->textsize += this_len - skip;
}
s->m_len = THRESHOLD;
#ifdef SWD_BEST_OFF
if (s->use_best_off)
memset(s->best_pos,0,sizeof(s->best_pos));
#endif
swd_findbest(s);
c->m_len = s->m_len;
c->m_off = s->m_off;
swd_getbyte(s);
if (s->b_char < 0)
{
c->look = 0;
c->m_len = 0;
swd_exit(s);
}
else
{
c->look = s->look + 1;
}
c->bp = c->ip - c->look;
#if 0
/* brute force match search */
if (c->m_len > THRESHOLD && c->m_len + 1 <= c->look)
{
const uint8_t *ip = c->bp;
const uint8_t *m = c->bp - c->m_off;
const uint8_t *in = c->in;
if (ip - in > N)
in = ip - N;
for (;;)
{
while (*in != *ip)
in++;
if (in == ip)
break;
if (in != m)
if (memcmp(in,ip,c->m_len+1) == 0)
printf("%p %p %p %5d\n",in,ip,m,c->m_len);
in++;
}
}
#endif
return UCL_E_OK;
}
static int bbConfig(struct ucl_compress *c, int endian, int bitsize)
{
if (endian != -1)
{
if (endian != 0)
return UCL_E_ERROR;
c->bb_c_endian = endian;
}
if (bitsize != -1)
{
if (bitsize != 8 && bitsize != 16 && bitsize != 32 && bitsize != 64)
return UCL_E_ERROR;
c->bb_c_s = bitsize;
c->bb_c_s8 = bitsize / 8;
}
c->bb_b = 0; c->bb_k = 0;
c->bb_p = NULL;
c->bb_op = NULL;
return UCL_E_OK;
}
static void bbWriteBits(struct ucl_compress *c)
{
uint8_t *p = c->bb_p;
uint64_t b = c->bb_b;
p[0] = (uint8_t)(b >> 0);
if (c->bb_c_s >= 16)
{
p[1] = (uint8_t)(b >> 8);
if (c->bb_c_s >= 32)
{
p[2] = (uint8_t)(b >> 16);
p[3] = (uint8_t)(b >> 24);
if (c->bb_c_s == 64)
{
p[4] = (uint8_t)(b >> 32);
p[5] = (uint8_t)(b >> 40);
p[6] = (uint8_t)(b >> 48);
p[7] = (uint8_t)(b >> 56);
}
}
}
}
static void bbPutBit(struct ucl_compress *c, unsigned bit)
{
assert(bit == 0 || bit == 1);
assert(c->bb_k <= c->bb_c_s);
if (c->bb_k < c->bb_c_s)
{
if (c->bb_k == 0)
{
assert(c->bb_p == NULL);
c->bb_p = c->bb_op;
c->bb_op += c->bb_c_s8;
}
assert(c->bb_p != NULL);
assert(c->bb_p + c->bb_c_s8 <= c->bb_op);
c->bb_b = (c->bb_b << 1) + bit;
c->bb_k++;
}
else
{
assert(c->bb_p != NULL);
assert(c->bb_p + c->bb_c_s8 <= c->bb_op);
bbWriteBits(c);
c->bb_p = c->bb_op;
c->bb_op += c->bb_c_s8;
c->bb_b = bit;
c->bb_k = 1;
}
}
static void bbPutByte(struct ucl_compress *c, unsigned b)
{
/**printf("putbyte %p %p %x (%d)\n", op, bb_p, x, bb_k);*/
assert(c->bb_p == NULL || c->bb_p + c->bb_c_s8 <= c->bb_op);
*c->bb_op++ = (uint8_t)(b);
}
static void bbFlushBits(struct ucl_compress *c, unsigned filler_bit)
{
if (c->bb_k > 0)
{
assert(c->bb_k <= c->bb_c_s);
while (c->bb_k != c->bb_c_s)
bbPutBit(c, filler_bit);
bbWriteBits(c);
c->bb_k = 0;
}
c->bb_p = NULL;
}
/***********************************************************************
//
************************************************************************/
static void code_prefix_ss11(struct ucl_compress *c, uint32_t i)
{
if (i >= 2)
{
uint32_t t = 4;
i += 2;
do {
t <<= 1;
} while (i >= t);
t >>= 1;
do {
t >>= 1;
bbPutBit(c, (i & t) ? 1 : 0);
bbPutBit(c, 0);
} while (t > 2);
}
bbPutBit(c, (unsigned)i & 1);
bbPutBit(c, 1);
}
static void
code_match(struct ucl_compress *c, unsigned int m_len, const unsigned int m_off)
{
while (m_len > c->conf.max_match)
{
code_match(c, c->conf.max_match - 3, m_off);
m_len -= c->conf.max_match - 3;
}
c->match_bytes += m_len;
if (m_len > c->result[3])
c->result[3] = m_len;
if (m_off > c->result[1])
c->result[1] = m_off;
bbPutBit(c, 0);
if (m_off == c->last_m_off)
{
bbPutBit(c, 0);
bbPutBit(c, 1);
}
else
{
code_prefix_ss11(c, 1 + ((m_off - 1) >> 8));
bbPutByte(c, (unsigned)m_off - 1);
}
m_len = m_len - 1 - (m_off > M2_MAX_OFFSET);
if (m_len >= 4)
{
bbPutBit(c,0);
bbPutBit(c,0);
code_prefix_ss11(c, m_len - 4);
}
else
{
bbPutBit(c, m_len > 1);
bbPutBit(c, (unsigned)m_len & 1);
}
c->last_m_off = m_off;
}
static void
code_run(struct ucl_compress *c, const uint8_t *ii, unsigned int lit)
{
if (lit == 0)
return;
c->lit_bytes += lit;
if (lit > c->result[5])
c->result[5] = lit;
do {
bbPutBit(c, 1);
bbPutByte(c, *ii++);
} while (--lit > 0);
}
/***********************************************************************
//
************************************************************************/
static int
len_of_coded_match(struct ucl_compress *c, unsigned int m_len, unsigned int
m_off)
{
int b;
if (m_len < 2 || (m_len == 2 && (m_off > M2_MAX_OFFSET))
|| m_off > c->conf.max_offset)
return -1;
assert(m_off > 0);
m_len = m_len - 2 - (m_off > M2_MAX_OFFSET);
if (m_off == c->last_m_off)
b = 1 + 2;
else
{
b = 1 + 10;
m_off = (m_off - 1) >> 8;
while (m_off > 0)
{
b += 2;
m_off >>= 1;
}
}
b += 2;
if (m_len < 3)
return b;
m_len -= 3;
do {
b += 2;
m_len >>= 1;
} while (m_len > 0);
return b;
}
int ucl_nrv2b_99_compress(
const uint8_t *in, unsigned long in_len,
uint8_t *out, unsigned long *out_len,
unsigned int *result)
{
const uint8_t *ii;
unsigned int lit;
unsigned int m_len, m_off;
struct ucl_compress c_buffer;
struct ucl_compress * const c = &c_buffer;
struct ucl_swd *swd;
unsigned int result_buffer[16];
int r;
/* max compression */
#define SC_TRY_LAZY 2
#define SC_GOOD_LENGTH F
#define SC_MAX_LAZY F
#define SC_NICE_LENGTH F
#define SC_MAX_CHAIN 4096
#define SC_FLAGS 1
#define SC_MAX_OFFSET N
memset(c, 0, sizeof(*c));
c->ip = c->in = in;
c->in_end = in + in_len;
c->out = out;
c->result = result ? result : result_buffer;
memset(c->result, 0, 16*sizeof(*c->result));
c->result[0] = c->result[2] = c->result[4] = UINT_MAX;
result = NULL;
memset(&c->conf, 0xff, sizeof(c->conf));
r = bbConfig(c, ENDIAN, BITSIZE);
if (r == 0)
r = bbConfig(c, c->conf.bb_endian, c->conf.bb_size);
if (r != 0)
return UCL_E_INVALID_ARGUMENT;
c->bb_op = out;
ii = c->ip; /* point to start of literal run */
lit = 0;
swd = (struct ucl_swd *) malloc(sizeof(*swd));
if (!swd)
return UCL_E_OUT_OF_MEMORY;
swd->f = F;
swd->n = N;
if (in_len >= 256 && in_len < swd->n)
swd->n = in_len;
if (swd->f < 8 || swd->n < 256)
return UCL_E_INVALID_ARGUMENT;
r = init_match(c,swd,NULL,0, SC_FLAGS);
if (r != UCL_E_OK)
{
free(swd);
return r;
}
if (SC_MAX_CHAIN > 0)
swd->max_chain = SC_MAX_CHAIN;
if (SC_NICE_LENGTH > 0)
swd->nice_length = SC_NICE_LENGTH;
if (c->conf.max_match < swd->nice_length)
swd->nice_length = c->conf.max_match;
c->last_m_off = 1;
r = find_match(c,swd,0,0);
if (r != UCL_E_OK)
return r;
while (c->look > 0)
{
unsigned int ahead;
unsigned int max_ahead;
int l1, l2;
c->codesize = c->bb_op - out;
m_len = c->m_len;
m_off = c->m_off;
assert(c->bp == c->ip - c->look);
assert(c->bp >= in);
if (lit == 0)
ii = c->bp;
assert(ii + lit == c->bp);
assert(swd->b_char == *(c->bp));
if (m_len < 2 || (m_len == 2 && (m_off > M2_MAX_OFFSET))
|| m_off > c->conf.max_offset)
{
/* a literal */
lit++;
swd->max_chain = SC_MAX_CHAIN;
r = find_match(c,swd,1,0);
assert(r == 0);
continue;
}
/* a match */
assert_match(swd,m_len,m_off);
/* shall we try a lazy match ? */
ahead = 0;
if (SC_TRY_LAZY <= 0 || m_len >= SC_MAX_LAZY || m_off ==
c->last_m_off)
{
/* no */
l1 = 0;
max_ahead = 0;
}
else
{
/* yes, try a lazy match */
l1 = len_of_coded_match(c,m_len,m_off);
assert(l1 > 0);
max_ahead = SC_TRY_LAZY;
if ((m_len - 1) < max_ahead) {
max_ahead = m_len -1;
}
}
while (ahead < max_ahead && c->look > m_len)
{
if (m_len >= SC_GOOD_LENGTH)
swd->max_chain = SC_MAX_CHAIN >> 2;
else
swd->max_chain = SC_MAX_CHAIN;
r = find_match(c,swd,1,0);
ahead++;
assert(r == 0);
assert(c->look > 0);
assert(ii + lit + ahead == c->bp);
if (c->m_len < 2)
continue;
l2 = len_of_coded_match(c,c->m_len,c->m_off);
if (l2 < 0)
continue;
if (l1 + (int)(ahead + c->m_len - m_len) * 5 > l2 +
(int)(ahead) * 9)
{
c->lazy++;
assert_match(swd,c->m_len,c->m_off);
lit += ahead;
assert(ii + lit == c->bp);
goto lazy_match_done;
}
}
assert(ii + lit + ahead == c->bp);
/* 1 - code run */
code_run(c,ii,lit);
lit = 0;
/* 2 - code match */
code_match(c,m_len,m_off);
swd->max_chain = SC_MAX_CHAIN;
r = find_match(c,swd,m_len,1+ahead);
assert(r == 0);
lazy_match_done: ;
}
/* store final run */
code_run(c,ii,lit);
/* EOF */
bbPutBit(c, 0);
code_prefix_ss11(c, 0x1000000U);
bbPutByte(c, 0xff);
bbFlushBits(c, 0);
assert(c->textsize == in_len);
c->codesize = c->bb_op - out;
*out_len = c->bb_op - out;
#if 0
printf("%7ld %7ld -> %7ld %7ld %7ld %ld (max: %d %d %d)\n",
(long) c->textsize, (long) in_len, (long) c->codesize,
c->match_bytes, c->lit_bytes, c->lazy,
c->result[1], c->result[3], c->result[5]);
#endif
assert(c->lit_bytes + c->match_bytes == in_len);
swd_exit(swd);
free(swd);
return UCL_E_OK;
}
void Encode(void) /* compression */
{
uint8_t *in, *out;
unsigned long in_len, out_len;
uint32_t tw;
int r;
fseek(infile, 0, SEEK_END);
in_len = ftell(infile);
#ifdef VERBOSE
if ((signed long)in_len < 0)
Fprintf((stderr, "Errno: %d", errno));
#endif
#if UCLPACK_COMPAT
{
uint8_t byte;
if (fwrite(magic, sizeof(magic), 1, outfile) != 1)
Error("Can't write.");
tw = htonl(0); /* flags */
if (fwrite(&tw, sizeof(tw), 1, outfile) != 1)
Error("Can't write.");
byte = 0x2b; /* method */
if (fwrite(&byte, sizeof(byte), 1, outfile) != 1)
Error("Can't write.");
byte = 10; /* level */
if (fwrite(&byte, sizeof(byte), 1, outfile) != 1)
Error("Can't write.");
tw = htonl(256*1024); /* block_size */
if (fwrite(&tw, sizeof(tw), 1, outfile) != 1)
Error("Can't write.");
tw = htonl(in_len);
if (fwrite(&tw, sizeof(tw), 1, outfile) != 1)
Error("Can't write."); /* output size of text */
}
#else
tw = host_to_i86ul(in_len);
if (fwrite(&tw, sizeof(tw), 1, outfile) != 1)
Error("Can't write."); /* output size of text */
#endif
if (in_len == 0)
return;
rewind(infile);
in = malloc(in_len);
out_len = in_len + (in_len/8) + 256;
out = malloc(out_len);
if (!in || !out) {
Error("Can't malloc");
}
if (fread(in, in_len, 1, infile) != 1) {
Error("Can't read");
}
r = ucl_nrv2b_99_compress(in, in_len, out, &out_len, 0 );
if (r != UCL_E_OK)
Error("Compression failure\n");
#if UCLPACK_COMPAT
tw = htonl(out_len);
if (fwrite(&tw, sizeof(tw), 1, outfile) != 1)
Error("Can't write."); /* file size of text */
#endif
if (fwrite(out, out_len, 1, outfile) != 1) {
Error("Write error\n");
}
#if UCLPACK_COMPAT
tw = htonl(0); /* EOF marker */
if (fwrite(&tw, sizeof(tw), 1, outfile) != 1)
Error("Can't write.");
#endif
#ifdef LONG_REPORT
Fprintf((stdout, "input size %ld bytes\n", in_len));
Fprintf((stdout, "output size %ld bytes\n", out_len));
Fprintf((stdout, "input/output %.3f\n", (double)in_len / out_len));
#else
Fprintf((stdout, "input/output = %ld/%ld = %.3f\n", in_len, out_len,
(double)in_len / out_len));
#endif
}
#endif
#ifdef DECODE
#define GETBIT_8(bb, src, ilen) \
(((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1)
#define GETBIT_LE16(bb, src, ilen) \
(bb*=2,bb&0xffff ? (bb>>16)&1 : (ilen+=2,((bb=(src[ilen-2]+src[ilen-1]*256u)*2+1)>>16)&1))
#define GETBIT_LE32(bb, src, ilen) \
(bc > 0 ? ((bb>>--bc)&1) : (bc=31,\
bb=*(const uint32_t *)((src)+ilen),ilen+=4,(bb>>31)&1))
#define GETBIT_LE64(bb, src, ilen) \
(bc > 0 ? ((bb>>--bc)&1) : (bc=63, \
bb=*(const uint64_t *)((src)+ilen),ilen+=8,(bb>>63)&1))
#if ENDIAN == 0 && BITSIZE == 8
#define GETBIT(bb, src, ilen) GETBIT_8(bb, src, ilen)
#endif
#if ENDIAN == 0 && BITSIZE == 16
#define GETBIT(bb, src, ilen) GETBIT_LE16(bb, src, ilen)
#endif
#if ENDIAN == 0 && BITSIZE == 32
#define GETBIT(bb, src, ilen) GETBIT_LE32(bb, src, ilen)
#endif
#if ENDIAN == 0 && BITSIZE == 64
#define GETBIT(bb, src, ilen) GETBIT_LE64(bb, src, ilen)
#endif
#ifndef GETBIT
#error "Bad Combination of ENDIAN and BITSIZE values specified"
#endif
#undef SAFE
#ifdef SAFE
#define FAIL(x,r) if (x) { Error(r); }
#else
#define FAIL(x,r)
#endif
void Decode(void) /* recover */
{
uint32_t tw;
uint8_t *src, *dst;
unsigned long max_src_len, src_len, dst_len;
unsigned long ilen = 0, olen = 0, last_m_off = 1;
#if BITSIZE <= 32
uint32_t bb = 0;
#elif BITSIZE == 64
uint64_t bb = 0;
#endif
unsigned bc = 0;
#if UCLPACK_COMPAT
if (fseek(infile, sizeof(magic) + sizeof(tw) + 1 + 1 + sizeof(tw),
SEEK_SET) != 0)
Error("Seek Error");
if (fread(&tw, sizeof(tw), 1, infile) < 1)
Error("Can't read"); /* read size of text */
dst_len = ntohl(tw);
if (fread(&tw, sizeof(tw), 1, infile) < 1)
Error("Can't read"); /* read size of file */
max_src_len = ntohl(tw);
#else
if (fread(&tw, sizeof(tw), 1, infile) < 1)
Error("Can't read"); /* read size of text */
dst_len = i86ul_to_host(tw);
max_src_len = dst_len + (dst_len/8) + 256;
#endif
if (dst_len == 0)
return;
dst = malloc(dst_len);
if (!dst)
Error("Can't malloc");
src = malloc(max_src_len);
if (!src)
Error("Can't malloc");
src_len = fread(src, 1, max_src_len, infile);
if (src_len <= 0)
Error("Can't read");
for(;;) {
unsigned int m_off, m_len;
while(GETBIT(bb, src, ilen)) {
FAIL(ilen >= src_len, "input overrun");
FAIL(olen >= dst_len, "output overrun");
dst[olen++] = src[ilen++];
}
m_off = 1;
do {
m_off = m_off*2 + GETBIT(bb, src, ilen);
FAIL(ilen >= src_len, "input overrun");
FAIL(m_off > 0xffffffU +3, "lookbehind overrun");
} while (!GETBIT(bb, src, ilen));
if (m_off == 2)
{
m_off = last_m_off;
}
else
{
FAIL(ilen >= src_len, "input overrun");
m_off = (m_off - 3)*256 + src[ilen++];
if (m_off == 0xffffffffU)
break;
last_m_off = ++m_off;
}
m_len = GETBIT(bb, src, ilen);
m_len = m_len*2 + GETBIT(bb, src, ilen);
if (m_len == 0)
{
m_len++;
do {
m_len = m_len*2 + GETBIT(bb, src, ilen);
FAIL(ilen >= src_len, "input overrun");
FAIL(m_len >= dst_len, "output overrun");
} while(!GETBIT(bb, src, ilen));
m_len += 2;
}
m_len += (m_off > 0xd00);
FAIL(olen + m_len > dst_len, "output overrun");
FAIL(m_off > olen, "lookbeind overrun");
{
const uint8_t *m_pos;
m_pos = dst + olen - m_off;
dst[olen++] = *m_pos++;
do {
dst[olen++] = *m_pos++;
} while(--m_len > 0);
}
}
FAIL(ilen < src_len, "input not consumed");
FAIL(ilen > src_len, "input overrun");
assert(ilen == src_len);
Fprintf((stderr, "%12ld\n", olen));
if (dst_len != olen) {
fprintf(stderr, "length != expected length\n");
}
if (fwrite(dst, olen, 1, outfile) != 1)
Error("Write error\n");
free(src);
free(dst);
}
#endif
#ifdef MAIN
int main(int argc, char *argv[])
{
char *s;
FILE *f;
int c;
if (argc == 2) {
outfile = stdout;
if ((f = tmpfile()) == NULL) {
perror("tmpfile");
return EXIT_FAILURE;
}
while ((c = getchar()) != EOF)
fputc(c, f);
rewind(infile = f);
}
else if (argc != 4) {
Fprintf((stderr, "'nrv2b e file1 file2' encodes file1 into file2.\n"
"'nrv2b d file2 file1' decodes file2 into file1.\n"));
return EXIT_FAILURE;
}
if (argc == 4) {
if ((s = argv[1], s[1] || strpbrk(s, "DEde") == NULL)
|| (s = argv[2], (infile = fopen(s, "rb")) == NULL)
|| (s = argv[3], (outfile = fopen(s, "wb")) == NULL)) {
Fprintf((stderr, "??? %s\n", s));
return EXIT_FAILURE;
}
}
if (toupper(*argv[1]) == 'E')
Encode();
else
Decode();
fclose(infile);
fclose(outfile);
return EXIT_SUCCESS;
}
#endif
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