+++ /dev/null
-/*
- * JFFS2 -- Journalling Flash File System, Version 2.
- *
- * Copyright (C) 2004 Patrik Kluba,
- * University of Szeged, Hungary
- *
- * For licensing information, see the file 'LICENCE' in the
- * jffs2 directory.
- *
- * $Id: compr_lzo.c,v 1.3 2004/06/23 16:34:39 havasi Exp $
- *
- */
-
-/*
- LZO1X-1 (and -999) compression module for jffs2
- based on the original LZO sources
-*/
-
-/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
-
-/*
- Original copyright notice follows:
-
- lzo1x_9x.c -- implementation of the LZO1X-999 compression algorithm
- lzo_ptr.h -- low-level pointer constructs
- lzo_swd.ch -- sliding window dictionary
- lzoconf.h -- configuration for the LZO real-time data compression library
- lzo_mchw.ch -- matching functions using a window
- minilzo.c -- mini subset of the LZO real-time data compression library
- config1x.h -- configuration for the LZO1X algorithm
- lzo1x.h -- public interface of the LZO1X compression algorithm
-
- These files are part of the LZO real-time data compression library.
-
- Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
- All Rights Reserved.
-
- The LZO library is free software; you can redistribute it and/or
- modify it 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.
-
- The LZO library 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 the LZO library; see the file COPYING.
- If not, write to the Free Software Foundation, Inc.,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- Markus F.X.J. Oberhumer
- <markus@oberhumer.com>
-*/
-
-/*
-
- 2004-02-16 pajko <pajko(AT)halom(DOT)u-szeged(DOT)hu>
- Initial release
- -removed all 16 bit code
- -all sensitive data will be on 4 byte boundary
- -removed check parts for library use
- -removed all but LZO1X-* compression
-
-*/
-
-
-#include <config.h>
-#include <linux/stddef.h>
-#include <jffs2/jffs2.h>
-#include <jffs2/compr_rubin.h>
-
-/* Integral types that have *exactly* the same number of bits as a lzo_voidp */
-typedef unsigned long lzo_ptr_t;
-typedef long lzo_sptr_t;
-
-/* data type definitions */
-#define U32 unsigned long
-#define S32 signed long
-#define I32 long
-#define U16 unsigned short
-#define S16 signed short
-#define I16 short
-#define U8 unsigned char
-#define S8 signed char
-#define I8 char
-
-#define M1_MAX_OFFSET 0x0400
-#define M2_MAX_OFFSET 0x0800
-#define M3_MAX_OFFSET 0x4000
-#define M4_MAX_OFFSET 0xbfff
-
-#define __COPY4(dst,src) * (lzo_uint32p)(dst) = * (const lzo_uint32p)(src)
-#define COPY4(dst,src) __COPY4((lzo_ptr_t)(dst),(lzo_ptr_t)(src))
-
-#define TEST_IP (ip < ip_end)
-#define TEST_OP (op <= op_end)
-
-#define NEED_IP(x) \
- if ((lzo_uint)(ip_end - ip) < (lzo_uint)(x)) goto input_overrun
-#define NEED_OP(x) \
- if ((lzo_uint)(op_end - op) < (lzo_uint)(x)) goto output_overrun
-#define TEST_LOOKBEHIND(m_pos,out) if (m_pos < out) goto lookbehind_overrun
-
-typedef U32 lzo_uint32;
-typedef I32 lzo_int32;
-typedef U32 lzo_uint;
-typedef I32 lzo_int;
-typedef int lzo_bool;
-
-#define lzo_byte U8
-#define lzo_bytep U8 *
-#define lzo_charp char *
-#define lzo_voidp void *
-#define lzo_shortp short *
-#define lzo_ushortp unsigned short *
-#define lzo_uint32p lzo_uint32 *
-#define lzo_int32p lzo_int32 *
-#define lzo_uintp lzo_uint *
-#define lzo_intp lzo_int *
-#define lzo_voidpp lzo_voidp *
-#define lzo_bytepp lzo_bytep *
-#define lzo_sizeof_dict_t sizeof(lzo_bytep)
-
-#define LZO_E_OK 0
-#define LZO_E_ERROR (-1)
-#define LZO_E_OUT_OF_MEMORY (-2) /* not used right now */
-#define LZO_E_NOT_COMPRESSIBLE (-3) /* not used right now */
-#define LZO_E_INPUT_OVERRUN (-4)
-#define LZO_E_OUTPUT_OVERRUN (-5)
-#define LZO_E_LOOKBEHIND_OVERRUN (-6)
-#define LZO_E_EOF_NOT_FOUND (-7)
-#define LZO_E_INPUT_NOT_CONSUMED (-8)
-
-#define PTR(a) ((lzo_ptr_t) (a))
-#define PTR_LINEAR(a) PTR(a)
-#define PTR_ALIGNED_4(a) ((PTR_LINEAR(a) & 3) == 0)
-#define PTR_ALIGNED_8(a) ((PTR_LINEAR(a) & 7) == 0)
-#define PTR_ALIGNED2_4(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 3) == 0)
-#define PTR_ALIGNED2_8(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 7) == 0)
-#define PTR_LT(a,b) (PTR(a) < PTR(b))
-#define PTR_GE(a,b) (PTR(a) >= PTR(b))
-#define PTR_DIFF(a,b) ((lzo_ptrdiff_t) (PTR(a) - PTR(b)))
-#define pd(a,b) ((lzo_uint) ((a)-(b)))
-
-typedef ptrdiff_t lzo_ptrdiff_t;
-
-static int
-lzo1x_decompress (const lzo_byte * in, lzo_uint in_len,
- lzo_byte * out, lzo_uintp out_len, lzo_voidp wrkmem)
-{
- register lzo_byte *op;
- register const lzo_byte *ip;
- register lzo_uint t;
-
- register const lzo_byte *m_pos;
-
- const lzo_byte *const ip_end = in + in_len;
- lzo_byte *const op_end = out + *out_len;
-
- *out_len = 0;
-
- op = out;
- ip = in;
-
- if (*ip > 17)
- {
- t = *ip++ - 17;
- if (t < 4)
- goto match_next;
- NEED_OP (t);
- NEED_IP (t + 1);
- do
- *op++ = *ip++;
- while (--t > 0);
- goto first_literal_run;
- }
-
- while (TEST_IP && TEST_OP)
- {
- t = *ip++;
- if (t >= 16)
- goto match;
- if (t == 0)
- {
- NEED_IP (1);
- while (*ip == 0)
- {
- t += 255;
- ip++;
- NEED_IP (1);
- }
- t += 15 + *ip++;
- }
- NEED_OP (t + 3);
- NEED_IP (t + 4);
- if (PTR_ALIGNED2_4 (op, ip))
- {
- COPY4 (op, ip);
-
- op += 4;
- ip += 4;
- if (--t > 0)
- {
- if (t >= 4)
- {
- do
- {
- COPY4 (op, ip);
- op += 4;
- ip += 4;
- t -= 4;
- }
- while (t >= 4);
- if (t > 0)
- do
- *op++ = *ip++;
- while (--t > 0);
- }
- else
- do
- *op++ = *ip++;
- while (--t > 0);
- }
- }
- else
- {
- *op++ = *ip++;
- *op++ = *ip++;
- *op++ = *ip++;
- do
- *op++ = *ip++;
- while (--t > 0);
- }
- first_literal_run:
-
- t = *ip++;
- if (t >= 16)
- goto match;
-
- m_pos = op - (1 + M2_MAX_OFFSET);
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
- TEST_LOOKBEHIND (m_pos, out);
- NEED_OP (3);
- *op++ = *m_pos++;
- *op++ = *m_pos++;
- *op++ = *m_pos;
-
- goto match_done;
-
- while (TEST_IP && TEST_OP)
- {
- match:
- if (t >= 64)
- {
- m_pos = op - 1;
- m_pos -= (t >> 2) & 7;
- m_pos -= *ip++ << 3;
- t = (t >> 5) - 1;
- TEST_LOOKBEHIND (m_pos, out);
- NEED_OP (t + 3 - 1);
- goto copy_match;
-
- }
- else if (t >= 32)
- {
- t &= 31;
- if (t == 0)
- {
- NEED_IP (1);
- while (*ip == 0)
- {
- t += 255;
- ip++;
- NEED_IP (1);
- }
- t += 31 + *ip++;
- }
-
- m_pos = op - 1;
- m_pos -= (ip[0] >> 2) + (ip[1] << 6);
-
- ip += 2;
- }
- else if (t >= 16)
- {
- m_pos = op;
- m_pos -= (t & 8) << 11;
-
- t &= 7;
- if (t == 0)
- {
- NEED_IP (1);
- while (*ip == 0)
- {
- t += 255;
- ip++;
- NEED_IP (1);
- }
- t += 7 + *ip++;
- }
-
- m_pos -= (ip[0] >> 2) + (ip[1] << 6);
-
- ip += 2;
- if (m_pos == op)
- goto eof_found;
- m_pos -= 0x4000;
- }
- else
- {
-
- m_pos = op - 1;
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
- TEST_LOOKBEHIND (m_pos, out);
- NEED_OP (2);
- *op++ = *m_pos++;
- *op++ = *m_pos;
-
- goto match_done;
- }
-
- TEST_LOOKBEHIND (m_pos, out);
- NEED_OP (t + 3 - 1);
- if (t >= 2 * 4 - (3 - 1)
- && PTR_ALIGNED2_4 (op, m_pos))
- {
- COPY4 (op, m_pos);
- op += 4;
- m_pos += 4;
- t -= 4 - (3 - 1);
- do
- {
- COPY4 (op, m_pos);
- op += 4;
- m_pos += 4;
- t -= 4;
- }
- while (t >= 4);
- if (t > 0)
- do
- *op++ = *m_pos++;
- while (--t > 0);
- }
- else
-
- {
- copy_match:
- *op++ = *m_pos++;
- *op++ = *m_pos++;
- do
- *op++ = *m_pos++;
- while (--t > 0);
- }
-
- match_done:
- t = ip[-2] & 3;
-
- if (t == 0)
- break;
-
- match_next:
- NEED_OP (t);
- NEED_IP (t + 1);
- do
- *op++ = *ip++;
- while (--t > 0);
- t = *ip++;
- }
- }
- *out_len = op - out;
- return LZO_E_EOF_NOT_FOUND;
-
- eof_found:
- *out_len = op - out;
- return (ip == ip_end ? LZO_E_OK :
- (ip <
- ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
-
- input_overrun:
- *out_len = op - out;
- return LZO_E_INPUT_OVERRUN;
-
- output_overrun:
- *out_len = op - out;
- return LZO_E_OUTPUT_OVERRUN;
-
- lookbehind_overrun:
- *out_len = op - out;
- return LZO_E_LOOKBEHIND_OVERRUN;
-}
-
-int lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
- u32 srclen, u32 destlen)
-{
- lzo_uint outlen = destlen;
- return lzo1x_decompress (data_in, srclen, cpage_out, &outlen, NULL);
-}
projects / u-boot / blobdiff