From 5e9934028aa030312a1a2e2e32d5ceade8672beb Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Wed, 3 Nov 2010 02:27:49 +0100 Subject: *: move lzo compressor code to archival/libunarchive/. No code changes Signed-off-by: Denys Vlasenko --- archival/lzo1x_c.c | 296 ----------------------------------------------------- 1 file changed, 296 deletions(-) delete mode 100644 archival/lzo1x_c.c (limited to 'archival/lzo1x_c.c') diff --git a/archival/lzo1x_c.c b/archival/lzo1x_c.c deleted file mode 100644 index cc86f74b1..000000000 --- a/archival/lzo1x_c.c +++ /dev/null @@ -1,296 +0,0 @@ -/* implementation of the LZO1[XY]-1 compression algorithm - - This file is part of the LZO real-time data compression library. - - Copyright (C) 1996..2008 Markus Franz Xaver Johannes Oberhumer - All Rights Reserved. - - Markus F.X.J. Oberhumer - http://www.oberhumer.com/opensource/lzo/ - - 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., - 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - */ - -/*********************************************************************** -// compress a block of data. -************************************************************************/ -static NOINLINE unsigned -do_compress(const uint8_t* in, unsigned in_len, - uint8_t* out, unsigned* out_len, - void* wrkmem) -{ - register const uint8_t* ip; - uint8_t* op; - const uint8_t* const in_end = in + in_len; - const uint8_t* const ip_end = in + in_len - M2_MAX_LEN - 5; - const uint8_t* ii; - const void* *const dict = (const void**) wrkmem; - - op = out; - ip = in; - ii = ip; - - ip += 4; - for (;;) { - register const uint8_t* m_pos; - unsigned m_off; - unsigned m_len; - unsigned dindex; - - D_INDEX1(dindex,ip); - GINDEX(m_pos,m_off,dict,dindex,in); - if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M4_MAX_OFFSET)) - goto literal; -#if 1 - if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3]) - goto try_match; - D_INDEX2(dindex,ip); -#endif - GINDEX(m_pos,m_off,dict,dindex,in); - if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,M4_MAX_OFFSET)) - goto literal; - if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3]) - goto try_match; - goto literal; - - try_match: -#if 1 && defined(LZO_UNALIGNED_OK_2) - if (* (const lzo_ushortp) m_pos != * (const lzo_ushortp) ip) -#else - if (m_pos[0] != ip[0] || m_pos[1] != ip[1]) -#endif - { - } else { - if (m_pos[2] == ip[2]) { -#if 0 - if (m_off <= M2_MAX_OFFSET) - goto match; - if (lit <= 3) - goto match; - if (lit == 3) { /* better compression, but slower */ - assert(op - 2 > out); op[-2] |= (uint8_t)(3); - *op++ = *ii++; *op++ = *ii++; *op++ = *ii++; - goto code_match; - } - if (m_pos[3] == ip[3]) -#endif - goto match; - } - else { - /* still need a better way for finding M1 matches */ -#if 0 - /* a M1 match */ -#if 0 - if (m_off <= M1_MAX_OFFSET && lit > 0 && lit <= 3) -#else - if (m_off <= M1_MAX_OFFSET && lit == 3) -#endif - { - register unsigned t; - - t = lit; - assert(op - 2 > out); op[-2] |= (uint8_t)(t); - do *op++ = *ii++; while (--t > 0); - assert(ii == ip); - m_off -= 1; - *op++ = (uint8_t)(M1_MARKER | ((m_off & 3) << 2)); - *op++ = (uint8_t)(m_off >> 2); - ip += 2; - goto match_done; - } -#endif - } - } - - /* a literal */ - literal: - UPDATE_I(dict, 0, dindex, ip, in); - ++ip; - if (ip >= ip_end) - break; - continue; - - /* a match */ -match: - UPDATE_I(dict, 0, dindex, ip, in); - /* store current literal run */ - if (pd(ip, ii) > 0) { - register unsigned t = pd(ip, ii); - - if (t <= 3) { - assert(op - 2 > out); - op[-2] |= (uint8_t)(t); - } - else if (t <= 18) - *op++ = (uint8_t)(t - 3); - else { - register unsigned tt = t - 18; - - *op++ = 0; - while (tt > 255) { - tt -= 255; - *op++ = 0; - } - assert(tt > 0); - *op++ = (uint8_t)(tt); - } - do *op++ = *ii++; while (--t > 0); - } - - /* code the match */ - assert(ii == ip); - ip += 3; - if (m_pos[3] != *ip++ || m_pos[4] != *ip++ || m_pos[5] != *ip++ - || m_pos[6] != *ip++ || m_pos[7] != *ip++ || m_pos[8] != *ip++ -#ifdef LZO1Y - || m_pos[ 9] != *ip++ || m_pos[10] != *ip++ || m_pos[11] != *ip++ - || m_pos[12] != *ip++ || m_pos[13] != *ip++ || m_pos[14] != *ip++ -#endif - ) { - --ip; - m_len = pd(ip, ii); - assert(m_len >= 3); - assert(m_len <= M2_MAX_LEN); - - if (m_off <= M2_MAX_OFFSET) { - m_off -= 1; -#if defined(LZO1X) - *op++ = (uint8_t)(((m_len - 1) << 5) | ((m_off & 7) << 2)); - *op++ = (uint8_t)(m_off >> 3); -#elif defined(LZO1Y) - *op++ = (uint8_t)(((m_len + 1) << 4) | ((m_off & 3) << 2)); - *op++ = (uint8_t)(m_off >> 2); -#endif - } - else if (m_off <= M3_MAX_OFFSET) { - m_off -= 1; - *op++ = (uint8_t)(M3_MARKER | (m_len - 2)); - goto m3_m4_offset; - } else { -#if defined(LZO1X) - m_off -= 0x4000; - assert(m_off > 0); - assert(m_off <= 0x7fff); - *op++ = (uint8_t)(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2)); - goto m3_m4_offset; -#elif defined(LZO1Y) - goto m4_match; -#endif - } - } - else { - { - const uint8_t* end = in_end; - const uint8_t* m = m_pos + M2_MAX_LEN + 1; - while (ip < end && *m == *ip) - m++, ip++; - m_len = pd(ip, ii); - } - assert(m_len > M2_MAX_LEN); - - if (m_off <= M3_MAX_OFFSET) { - m_off -= 1; - if (m_len <= 33) - *op++ = (uint8_t)(M3_MARKER | (m_len - 2)); - else { - m_len -= 33; - *op++ = M3_MARKER | 0; - goto m3_m4_len; - } - } else { -#if defined(LZO1Y) - m4_match: -#endif - m_off -= 0x4000; - assert(m_off > 0); - assert(m_off <= 0x7fff); - if (m_len <= M4_MAX_LEN) - *op++ = (uint8_t)(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2)); - else { - m_len -= M4_MAX_LEN; - *op++ = (uint8_t)(M4_MARKER | ((m_off & 0x4000) >> 11)); - m3_m4_len: - while (m_len > 255) { - m_len -= 255; - *op++ = 0; - } - assert(m_len > 0); - *op++ = (uint8_t)(m_len); - } - } - m3_m4_offset: - *op++ = (uint8_t)((m_off & 63) << 2); - *op++ = (uint8_t)(m_off >> 6); - } -#if 0 - match_done: -#endif - ii = ip; - if (ip >= ip_end) - break; - } - - *out_len = pd(op, out); - return pd(in_end, ii); -} - -/*********************************************************************** -// public entry point -************************************************************************/ -int DO_COMPRESS(const uint8_t* in, unsigned in_len, - uint8_t* out, unsigned* out_len, - void* wrkmem) -{ - uint8_t* op = out; - unsigned t; - - if (in_len <= M2_MAX_LEN + 5) - t = in_len; - else { - t = do_compress(in,in_len,op,out_len,wrkmem); - op += *out_len; - } - - if (t > 0) { - const uint8_t* ii = in + in_len - t; - - if (op == out && t <= 238) - *op++ = (uint8_t)(17 + t); - else if (t <= 3) - op[-2] |= (uint8_t)(t); - else if (t <= 18) - *op++ = (uint8_t)(t - 3); - else { - unsigned tt = t - 18; - - *op++ = 0; - while (tt > 255) { - tt -= 255; - *op++ = 0; - } - assert(tt > 0); - *op++ = (uint8_t)(tt); - } - do *op++ = *ii++; while (--t > 0); - } - - *op++ = M4_MARKER | 1; - *op++ = 0; - *op++ = 0; - - *out_len = pd(op, out); - return 0; /*LZO_E_OK*/ -} -- cgit v1.2.3