Hi, This is kernel port of LZO1X de/compression algo stripped down to just ~500 LOC! It is derived from original LZO 2.02 code found at: http://www.oberhumer.com/opensource/lzo/download/ The code has also been reformatted to match general kernel style. Facts for LZO (at least for original code. Should hold true for this port also - hence the RFC!): - The compressor can never overrun buffer. - The "non-safe" version of decompressor can never overrun buffer if compressed data is unmodified. I am not sure about this if compressed data is malicious (to be confirmed from the author). - The "safe" version can never crash (buffer overrun etc.) - confirmed from the author. This patch, as of yet, only gives 'non-safe' version of decompressor. The 'safe' version will be included soon. Since 'non-safe' version has no problems if compressed data is unmodified, it is useful in cases we have such guarantees on compressed data and hence don't want additional overhead of 'safe' version. For e.g. Compressed Caching project (http://linuxcompressed.sourceforge.net) has been using the 'non-safe' version of LZO1X since long time without any problems w.r.t. de/compression itself. For now, I have tested this on x86 only. Signed-off-by: Nitin Gupta <[email protected]> --- diff --git a/include/linux/lzo1x.h b/include/linux/lzo1x.h new file mode 100755 index 0000000..aae547e --- /dev/null +++ b/include/linux/lzo1x.h @@ -0,0 +1,61 @@ +/* lzo1x.h -- public interface of the LZO1X compression algorithm + + This file is part of the LZO real-time data compression library. + + Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1996 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, + version 2, as published by the Free Software Foundation. + + 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. + + Markus F.X.J. Oberhumer + <[email protected]> + http://www.oberhumer.com/opensource/lzo/ + + + This file is modified version of lzo1x.h found in original LZO 2.02 + code. Some additional changes have also been made to make it work + in kernel space. + + Nitin Gupta + <[email protected]> + */ + +#ifndef __LZO1X_H +#define __LZO1X_H + +/* Size of temp buffer (workmem) required by lzo1x_compress */ +#define LZO1X_WORKMEM_SIZE ((size_t) (16384L * sizeof(unsigned char *))) + +/* LZO1X_1 compression */ +int +lzo1x_compress(const unsigned char *src, size_t src_len, + unsigned char *dst, size_t *dst_len, + void *workmem); + +/* LZO1X_1 decompression */ +int +lzo1x_decompress(const unsigned char *src, size_t src_len, + unsigned char *dst, size_t *dst_len); + +#endif diff --git a/lib/Kconfig b/lib/Kconfig index 2e7ae6b..9d30b1f 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -64,6 +64,12 @@ config ZLIB_INFLATE config ZLIB_DEFLATE tristate +config LZO1X + tristate "LZO1X Compression/Decompression" + help + Compression: LZO1X-1 + Decompression: LZO1X + # # Generic allocator support is selected if needed # diff --git a/lib/Makefile b/lib/Makefile index c8c8e20..4dad99d 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -49,6 +49,7 @@ obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/ obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate/ obj-$(CONFIG_REED_SOLOMON) += reed_solomon/ +obj-$(CONFIG_LZO1X) += lzo1x/ obj-$(CONFIG_TEXTSEARCH) += textsearch.o obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o diff --git a/lib/lzo1x/Makefile b/lib/lzo1x/Makefile new file mode 100644 index 0000000..322683e --- /dev/null +++ b/lib/lzo1x/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_LZO1X) += lzo1x.o +lzo1x-objs := lzo1x_compress.o lzo1x_decompress.o diff --git a/lib/lzo1x/lzo1x_compress.c b/lib/lzo1x/lzo1x_compress.c new file mode 100755 index 0000000..02e3324 --- /dev/null +++ b/lib/lzo1x/lzo1x_compress.c @@ -0,0 +1,255 @@ +/* lzo1x_compress.c -- LZO1X-1 compression + + This file is part of the LZO real-time data compression library. + + Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1996 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, + version 2, as published by the Free Software Foundation. + + 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. + + Markus F.X.J. Oberhumer + <[email protected]> + http://www.oberhumer.com/opensource/lzo/ + + + This file is derived from lzo1x_1.c and lzo1x_c.ch found in original + LZO 2.02 code. Some additional changes have also been made to make + it work in kernel space. + + Nitin Gupta + <[email protected]> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/compiler.h> + +#include "lzo1x_int.h" + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LZO1X Compression"); + +/* compress a block of data. */ +static unsigned int +lzo1x_compress_worker(const unsigned char *in, size_t in_len, + unsigned char *out, size_t *out_len, + void *workmem) +{ + register const unsigned char *ip; + unsigned char *op; + const unsigned char * const in_end = in + in_len; + const unsigned char * const ip_end = in + in_len - M2_MAX_LEN - 5; + const unsigned char *ii; + const unsigned char ** const dict = (const unsigned char **)workmem; + + op = out; + ip = in; + ii = ip; + + ip += 4; + for (;;) { + register const unsigned char *m_pos; + size_t m_off; + size_t m_len; + size_t dindex; + + DINDEX1(dindex,ip); + m_pos = dict[dindex]; + + 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; + + DINDEX2(dindex,ip); + m_pos = dict[dindex]; + + 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 (*(const unsigned short *)m_pos != *(const unsigned short *)ip) { + } else { + if (likely(m_pos[2] == ip[2])) + goto match; + } + + /* a literal */ +literal: + dict[dindex] = ip; + ++ip; + if (unlikely(ip >= ip_end)) + break; + continue; + + + /* a match */ +match: + dict[dindex] = ip; + /* store current literal run */ + if (pd(ip,ii) > 0) { + register size_t t = pd(ip,ii); + if (t <= 3) + op[-2] |= (unsigned char)(t); + else if (t <= 18) + *op++ = (unsigned char)(t - 3); + else { + register size_t tt = t - 18; + *op++ = 0; + while (tt > 255) { + tt -= 255; + *op++ = 0; + } + *op++ = (unsigned char)(tt); + } + do *op++ = *ii++; while (--t > 0); + } + + /* code the match */ + 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++) { + --ip; + m_len = pd(ip, ii); + + if (m_off <= M2_MAX_OFFSET) { + m_off -= 1; + *op++ = (unsigned char)(((m_len - 1) << 5) | ((m_off & 7) << 2)); + *op++ = (unsigned char)(m_off >> 3); + } + else if (m_off <= M3_MAX_OFFSET) { + m_off -= 1; + *op++ = (unsigned char)(M3_MARKER | (m_len - 2)); + goto m3_m4_offset; + } else { + m_off -= 0x4000; + *op++ = (unsigned char)(M4_MARKER | + ((m_off & 0x4000) >> 11) | (m_len - 2)); + goto m3_m4_offset; + } + } else { + const unsigned char *end = in_end; + const unsigned char *m = m_pos + M2_MAX_LEN + 1; + while (ip < end && *m == *ip) + m++, ip++; + m_len = pd(ip, ii); + + if (m_off <= M3_MAX_OFFSET) { + m_off -= 1; + if (m_len <= 33) + *op++ = (unsigned char)(M3_MARKER | (m_len - 2)); + else { + m_len -= 33; + *op++ = M3_MARKER | 0; + goto m3_m4_len; + } + } else { + m_off -= 0x4000; + if (m_len <= M4_MAX_LEN) + *op++ = (unsigned char)(M4_MARKER | + ((m_off & 0x4000) >> 11) | (m_len - 2)); + else { + m_len -= M4_MAX_LEN; + *op++ = (unsigned char)(M4_MARKER | ((m_off & 0x4000) >> 11)); +m3_m4_len: + while (m_len > 255) { + m_len -= 255; + *op++ = 0; + } + *op++ = (unsigned char)(m_len); + } + } + +m3_m4_offset: + *op++ = (unsigned char)((m_off & 63) << 2); + *op++ = (unsigned char)(m_off >> 6); + } + + ii = ip; + if (unlikely(ip >= ip_end)) + break; + } + + *out_len = pd(op, out); + return pd(in_end,ii); +} + + +/* + * This requires buffer (workmem) of size LZO1X_WORKMEM_SIZE + * (exported by lzo1x.h). + */ +int +lzo1x_compress(const unsigned char *in, size_t in_len, + unsigned char *out, size_t *out_len, + void *workmem) +{ + unsigned char *op = out; + size_t t; + + if (!workmem) + return -EINVAL; + + if (unlikely(in_len <= M2_MAX_LEN + 5)) + t = in_len; + else { + t = lzo1x_compress_worker(in,in_len,op,out_len,workmem); + op += *out_len; + } + + if (t > 0) { + const unsigned char *ii = in + in_len - t; + + if (op == out && t <= 238) + *op++ = (unsigned char)(17 + t); + else if (t <= 3) + op[-2] |= (unsigned char)(t); + else if (t <= 18) + *op++ = (unsigned char)(t - 3); + else { + size_t tt = t - 18; + *op++ = 0; + while (tt > 255) { + tt -= 255; + *op++ = 0; + } + *op++ = (unsigned char)(tt); + } + do { + *op++ = *ii++; + } while (--t > 0); + } + *op++ = M4_MARKER | 1; + *op++ = 0; + *op++ = 0; + + *out_len = pd(op, out); + return 0; +} + +EXPORT_SYMBOL(lzo1x_compress); diff --git a/lib/lzo1x/lzo1x_decompress.c b/lib/lzo1x/lzo1x_decompress.c new file mode 100755 index 0000000..fbd4d69 --- /dev/null +++ b/lib/lzo1x/lzo1x_decompress.c @@ -0,0 +1,216 @@ +/* lzo1x_decompress.c -- LZO1X decompression + + This file is part of the LZO real-time data compression library. + + Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1996 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, + version 2, as published by the Free Software Foundation. + + 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. + + Markus F.X.J. Oberhumer + <[email protected]> + http://www.oberhumer.com/opensource/lzo/ + + + This file is derived from lzo1x_d1.c and lzo1x_d.ch found in original + LZO 2.02 code. Some additional changes have also been made to make + it work in kernel space. + + Nitin Gupta + <[email protected]> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <asm/byteorder.h> + +#include "lzo1x_int.h" + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LZO1X Decompression"); + +int +lzo1x_decompress(const unsigned char *in, size_t in_len, + unsigned char *out, size_t *out_len) +{ + register size_t t; + register unsigned char *op; + register const unsigned char *ip, *m_pos; + const unsigned char * const ip_end = in + in_len; + + *out_len = 0; + + op = out; + ip = in; + + if (*ip > 17) { + t = *ip++ - 17; + if (t < 4) + goto match_next; + do + *op++ = *ip++; + while (--t > 0); + goto first_literal_run; + } + + while (1) { + t = *ip++; + if (t >= 16) + goto match; + /* a literal run */ + if (t == 0) { + while (*ip == 0) { + t += 255; + ip++; + } + t += 15 + *ip++; + } + /* copy literals */ + 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); + } + +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; + *op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos; + goto match_done; + + /* handle matches */ + do { + match: + if (t >= 64) { /* a M2 match */ + m_pos = op - 1; + m_pos -= (t >> 2) & 7; + m_pos -= *ip++ << 3; + t = (t >> 5) - 1; + goto copy_match; + } else if (t >= 32) { /* a M3 match */ + t &= 31; + if (t == 0) { + while (*ip == 0) { + t += 255; + ip++; + } + t += 31 + *ip++; + } +#if defined(__LITTLE_ENDIAN) + m_pos = op - 1; + m_pos -= (*(const unsigned short *)ip) >> 2; +#else + m_pos = op - 1; + m_pos -= (ip[0] >> 2) + (ip[1] << 6); +#endif + ip += 2; + } else if (t >= 16) { /* a M4 match */ + m_pos = op; + m_pos -= (t & 8) << 11; + t &= 7; + if (t == 0) { + while (*ip == 0) { + t += 255; + ip++; + } + t += 7 + *ip++; + } +#if defined(__LITTLE_ENDIAN) + m_pos -= (*(const unsigned short *)ip) >> 2; +#else + m_pos -= (ip[0] >> 2) + (ip[1] << 6); +#endif + ip += 2; + if (m_pos == op) + goto eof_found; + m_pos -= 0x4000; + } else { /* a M1 match */ + m_pos = op - 1; + m_pos -= t >> 2; + m_pos -= *ip++ << 2; + *op++ = *m_pos++; *op++ = *m_pos; + goto match_done; + } + + /* copy match */ + if (t >= 2 * 4 - (3 - 1) && (op - m_pos) >= 4) { + 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; + + /* copy literals */ +match_next: + *op++ = *ip++; + if (t > 1) { + *op++ = *ip++; + if (t > 2) + *op++ = *ip++; + } + t = *ip++; + } while (1); + } + +eof_found: + *out_len = pd(op, out); + return (ip == ip_end ? 0 : -1); +} + +EXPORT_SYMBOL(lzo1x_decompress); diff --git a/lib/lzo1x/lzo1x_int.h b/lib/lzo1x/lzo1x_int.h new file mode 100755 index 0000000..4dd993d --- /dev/null +++ b/lib/lzo1x/lzo1x_int.h @@ -0,0 +1,105 @@ +/* lzo1x_int.h -- to be used internally by LZO de/compression algorithms + + This file is part of the LZO real-time data compression library. + + Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1996 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, + version 2, as published by the Free Software Foundation. + + 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. + + Markus F.X.J. Oberhumer + <[email protected]> + http://www.oberhumer.com/opensource/lzo/ + + + This file was derived from several header files found in original + LZO 2.02 code. Some additional changes have also been made to make + it work in kernel space. + + Nitin Gupta + <[email protected]> + */ + +#ifndef __LZO1X_INT_H +#define __LZO1X_INT_H + +#include <linux/types.h> + +#define D_SIZE (1u << D_BITS) +#define D_MASK (D_SIZE - 1) +#define D_HIGH ((D_MASK >> 1) + 1) + +#define DX2(p,s1,s2) \ + (((((size_t)((p)[2]) << (s2)) ^ (p)[1]) << (s1)) ^ (p)[0]) +#define DX3(p,s1,s2,s3) ((DX2((p)+1,s2,s3) << (s1)) ^ (p)[0]) +#define DMUL(a,b) ((size_t) ((a) * (b))) +#define DMS(v,s) ((size_t) (((v) & (D_MASK >> (s))) << (s))) +#define DM(v) DMS(v,0) + +#define D_BITS 14 +#define DINDEX1(d,p) d = DM(DMUL(0x21,DX3(p,5,5,6)) >> 5) +#define DINDEX2(d,p) d = (d & (D_MASK & 0x7ff)) ^ (D_HIGH | 0x1f) +#define DENTRY(p,in) (p) + +#define PTR(a) ((unsigned long) (a)) +#define PTR_LT(a,b) (PTR(a) < PTR(b)) +#define PTR_GE(a,b) (PTR(a) >= PTR(b)) +#define PTR_DIFF(a,b) (PTR(a) - PTR(b)) +#define pd(a,b) ((size_t) ((a)-(b))) + +#define LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,max_offset) \ + ( m_pos = ip - (size_t) PTR_DIFF(ip,m_pos), \ + PTR_LT(m_pos,in) || \ + (m_off = (size_t) PTR_DIFF(ip,m_pos)) <= 0 || \ + m_off > max_offset ) + +#define COPY4(dst,src) *(uint32_t *)(dst) = *(uint32_t *)(src) + + +/* LZO1X Specific constants */ + +#define M1_MAX_OFFSET 0x0400 +#define M2_MAX_OFFSET 0x0800 +#define M3_MAX_OFFSET 0x4000 +#define M4_MAX_OFFSET 0xbfff + +#define MX_MAX_OFFSET (M1_MAX_OFFSET + M2_MAX_OFFSET) + +#define M1_MIN_LEN 2 +#define M1_MAX_LEN 2 +#define M2_MIN_LEN 3 +#define M2_MAX_LEN 8 +#define M3_MIN_LEN 3 +#define M3_MAX_LEN 33 +#define M4_MIN_LEN 3 +#define M4_MAX_LEN 9 + +#define M1_MARKER 0 +#define M2_MARKER 64 +#define M3_MARKER 32 +#define M4_MARKER 16 + +#define MIN_LOOKAHEAD (M2_MAX_LEN + 1) + +#endif /* already included */
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