lib/lzo: Update LZO compression to current upstream version
This commit updates the kernel LZO code to the current upsteam version which features a significant speed improvement - benchmarking the Calgary and Silesia test corpora typically shows a doubled performance in both compression and decompression on modern i386/x86_64/powerpc machines. Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com>
This commit is contained in:
Markus F.X.J. Oberhumer
parent
b6bec26cea
commit
8b975bd3f9
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@ -4,28 +4,28 @@
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* LZO Public Kernel Interface
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* A mini subset of the LZO real-time data compression library
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*
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* Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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* Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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*
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* The full LZO package can be found at:
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* http://www.oberhumer.com/opensource/lzo/
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*
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* Changed for kernel use by:
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* Changed for Linux kernel use by:
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* Nitin Gupta <nitingupta910@gmail.com>
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* Richard Purdie <rpurdie@openedhand.com>
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*/
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#define LZO1X_MEM_COMPRESS (16384 * sizeof(unsigned char *))
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#define LZO1X_1_MEM_COMPRESS LZO1X_MEM_COMPRESS
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#define LZO1X_1_MEM_COMPRESS (8192 * sizeof(unsigned short))
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#define LZO1X_MEM_COMPRESS LZO1X_1_MEM_COMPRESS
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#define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
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/* This requires 'workmem' of size LZO1X_1_MEM_COMPRESS */
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/* This requires 'wrkmem' of size LZO1X_1_MEM_COMPRESS */
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int lzo1x_1_compress(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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/* safe decompression with overrun testing */
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int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len);
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unsigned char *dst, size_t *dst_len);
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/*
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* Return values (< 0 = Error)
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@ -40,5 +40,6 @@ int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
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#define LZO_E_EOF_NOT_FOUND (-7)
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#define LZO_E_INPUT_NOT_CONSUMED (-8)
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#define LZO_E_NOT_YET_IMPLEMENTED (-9)
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#define LZO_E_INVALID_ARGUMENT (-10)
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#endif
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@ -1,194 +1,243 @@
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/*
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* LZO1X Compressor from MiniLZO
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* LZO1X Compressor from LZO
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*
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* Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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* Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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*
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* The full LZO package can be found at:
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* http://www.oberhumer.com/opensource/lzo/
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*
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* Changed for kernel use by:
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* Changed for Linux kernel use by:
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* Nitin Gupta <nitingupta910@gmail.com>
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* Richard Purdie <rpurdie@openedhand.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/lzo.h>
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#include <asm/unaligned.h>
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#include <linux/lzo.h>
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#include "lzodefs.h"
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static noinline size_t
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_lzo1x_1_do_compress(const unsigned char *in, size_t in_len,
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unsigned char *out, size_t *out_len, void *wrkmem)
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lzo1x_1_do_compress(const unsigned char *in, size_t in_len,
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unsigned char *out, size_t *out_len,
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size_t ti, void *wrkmem)
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{
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const unsigned char *ip;
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unsigned char *op;
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const unsigned char * const in_end = in + in_len;
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const unsigned char * const ip_end = in + in_len - M2_MAX_LEN - 5;
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const unsigned char ** const dict = wrkmem;
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const unsigned char *ip = in, *ii = ip;
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const unsigned char *end, *m, *m_pos;
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size_t m_off, m_len, dindex;
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unsigned char *op = out;
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const unsigned char * const ip_end = in + in_len - 20;
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const unsigned char *ii;
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lzo_dict_t * const dict = (lzo_dict_t *) wrkmem;
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ip += 4;
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op = out;
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ip = in;
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ii = ip;
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ip += ti < 4 ? 4 - ti : 0;
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for (;;) {
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dindex = ((size_t)(0x21 * DX3(ip, 5, 5, 6)) >> 5) & D_MASK;
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m_pos = dict[dindex];
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if (m_pos < in)
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goto literal;
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if (ip == m_pos || ((size_t)(ip - m_pos) > M4_MAX_OFFSET))
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goto literal;
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m_off = ip - m_pos;
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if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
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goto try_match;
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dindex = (dindex & (D_MASK & 0x7ff)) ^ (D_HIGH | 0x1f);
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m_pos = dict[dindex];
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if (m_pos < in)
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goto literal;
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if (ip == m_pos || ((size_t)(ip - m_pos) > M4_MAX_OFFSET))
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goto literal;
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m_off = ip - m_pos;
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if (m_off <= M2_MAX_OFFSET || m_pos[3] == ip[3])
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goto try_match;
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goto literal;
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try_match:
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if (get_unaligned((const unsigned short *)m_pos)
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== get_unaligned((const unsigned short *)ip)) {
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if (likely(m_pos[2] == ip[2]))
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goto match;
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}
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const unsigned char *m_pos;
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size_t t, m_len, m_off;
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u32 dv;
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literal:
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dict[dindex] = ip;
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++ip;
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ip += 1 + ((ip - ii) >> 5);
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next:
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if (unlikely(ip >= ip_end))
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break;
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continue;
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match:
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dict[dindex] = ip;
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if (ip != ii) {
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size_t t = ip - ii;
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dv = get_unaligned_le32(ip);
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t = ((dv * 0x1824429d) >> (32 - D_BITS)) & D_MASK;
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m_pos = in + dict[t];
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dict[t] = (lzo_dict_t) (ip - in);
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if (unlikely(dv != get_unaligned_le32(m_pos)))
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goto literal;
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ii -= ti;
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ti = 0;
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t = ip - ii;
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if (t != 0) {
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if (t <= 3) {
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op[-2] |= t;
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} else if (t <= 18) {
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COPY4(op, ii);
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op += t;
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} else if (t <= 16) {
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*op++ = (t - 3);
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COPY8(op, ii);
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COPY8(op + 8, ii + 8);
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op += t;
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} else {
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size_t tt = t - 18;
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*op++ = 0;
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while (tt > 255) {
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tt -= 255;
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if (t <= 18) {
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*op++ = (t - 3);
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} else {
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size_t tt = t - 18;
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*op++ = 0;
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}
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*op++ = tt;
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}
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do {
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*op++ = *ii++;
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} while (--t > 0);
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}
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ip += 3;
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if (m_pos[3] != *ip++ || m_pos[4] != *ip++
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|| m_pos[5] != *ip++ || m_pos[6] != *ip++
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|| m_pos[7] != *ip++ || m_pos[8] != *ip++) {
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--ip;
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m_len = ip - ii;
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if (m_off <= M2_MAX_OFFSET) {
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m_off -= 1;
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*op++ = (((m_len - 1) << 5)
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| ((m_off & 7) << 2));
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*op++ = (m_off >> 3);
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} else if (m_off <= M3_MAX_OFFSET) {
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m_off -= 1;
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*op++ = (M3_MARKER | (m_len - 2));
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goto m3_m4_offset;
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} else {
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m_off -= 0x4000;
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*op++ = (M4_MARKER | ((m_off & 0x4000) >> 11)
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| (m_len - 2));
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goto m3_m4_offset;
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}
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} else {
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end = in_end;
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m = m_pos + M2_MAX_LEN + 1;
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while (ip < end && *m == *ip) {
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m++;
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ip++;
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}
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m_len = ip - ii;
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if (m_off <= M3_MAX_OFFSET) {
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m_off -= 1;
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if (m_len <= 33) {
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*op++ = (M3_MARKER | (m_len - 2));
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} else {
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m_len -= 33;
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*op++ = M3_MARKER | 0;
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goto m3_m4_len;
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}
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} else {
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m_off -= 0x4000;
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if (m_len <= M4_MAX_LEN) {
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*op++ = (M4_MARKER
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| ((m_off & 0x4000) >> 11)
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| (m_len - 2));
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} else {
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m_len -= M4_MAX_LEN;
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*op++ = (M4_MARKER
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| ((m_off & 0x4000) >> 11));
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m3_m4_len:
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while (m_len > 255) {
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m_len -= 255;
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while (unlikely(tt > 255)) {
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tt -= 255;
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*op++ = 0;
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}
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*op++ = (m_len);
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*op++ = tt;
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}
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do {
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COPY8(op, ii);
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COPY8(op + 8, ii + 8);
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op += 16;
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ii += 16;
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t -= 16;
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} while (t >= 16);
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if (t > 0) do {
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*op++ = *ii++;
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} while (--t > 0);
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}
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m3_m4_offset:
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*op++ = ((m_off & 63) << 2);
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*op++ = (m_off >> 6);
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}
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ii = ip;
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if (unlikely(ip >= ip_end))
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break;
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}
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m_len = 4;
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{
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && defined(LZO_USE_CTZ64)
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u64 v;
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v = get_unaligned((const u64 *) (ip + m_len)) ^
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get_unaligned((const u64 *) (m_pos + m_len));
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if (unlikely(v == 0)) {
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do {
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m_len += 8;
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v = get_unaligned((const u64 *) (ip + m_len)) ^
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get_unaligned((const u64 *) (m_pos + m_len));
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if (unlikely(ip + m_len >= ip_end))
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goto m_len_done;
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} while (v == 0);
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}
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# if defined(__LITTLE_ENDIAN)
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m_len += (unsigned) __builtin_ctzll(v) / 8;
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# elif defined(__BIG_ENDIAN)
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m_len += (unsigned) __builtin_clzll(v) / 8;
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# else
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# error "missing endian definition"
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# endif
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#elif defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && defined(LZO_USE_CTZ32)
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u32 v;
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v = get_unaligned((const u32 *) (ip + m_len)) ^
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get_unaligned((const u32 *) (m_pos + m_len));
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if (unlikely(v == 0)) {
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do {
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m_len += 4;
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v = get_unaligned((const u32 *) (ip + m_len)) ^
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get_unaligned((const u32 *) (m_pos + m_len));
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if (v != 0)
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break;
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m_len += 4;
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v = get_unaligned((const u32 *) (ip + m_len)) ^
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get_unaligned((const u32 *) (m_pos + m_len));
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if (unlikely(ip + m_len >= ip_end))
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goto m_len_done;
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} while (v == 0);
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}
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# if defined(__LITTLE_ENDIAN)
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m_len += (unsigned) __builtin_ctz(v) / 8;
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# elif defined(__BIG_ENDIAN)
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m_len += (unsigned) __builtin_clz(v) / 8;
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# else
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# error "missing endian definition"
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# endif
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#else
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if (unlikely(ip[m_len] == m_pos[m_len])) {
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do {
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (ip[m_len] != m_pos[m_len])
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break;
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m_len += 1;
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if (unlikely(ip + m_len >= ip_end))
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goto m_len_done;
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} while (ip[m_len] == m_pos[m_len]);
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}
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#endif
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}
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m_len_done:
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m_off = ip - m_pos;
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ip += m_len;
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ii = ip;
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if (m_len <= M2_MAX_LEN && m_off <= M2_MAX_OFFSET) {
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m_off -= 1;
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*op++ = (((m_len - 1) << 5) | ((m_off & 7) << 2));
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*op++ = (m_off >> 3);
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} else if (m_off <= M3_MAX_OFFSET) {
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m_off -= 1;
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if (m_len <= M3_MAX_LEN)
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*op++ = (M3_MARKER | (m_len - 2));
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else {
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m_len -= M3_MAX_LEN;
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*op++ = M3_MARKER | 0;
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while (unlikely(m_len > 255)) {
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m_len -= 255;
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*op++ = 0;
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}
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*op++ = (m_len);
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}
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*op++ = (m_off << 2);
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*op++ = (m_off >> 6);
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} else {
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m_off -= 0x4000;
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if (m_len <= M4_MAX_LEN)
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*op++ = (M4_MARKER | ((m_off >> 11) & 8)
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| (m_len - 2));
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else {
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m_len -= M4_MAX_LEN;
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*op++ = (M4_MARKER | ((m_off >> 11) & 8));
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while (unlikely(m_len > 255)) {
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m_len -= 255;
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*op++ = 0;
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}
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*op++ = (m_len);
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}
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*op++ = (m_off << 2);
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*op++ = (m_off >> 6);
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}
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goto next;
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}
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*out_len = op - out;
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return in_end - ii;
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return in_end - (ii - ti);
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}
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int lzo1x_1_compress(const unsigned char *in, size_t in_len, unsigned char *out,
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size_t *out_len, void *wrkmem)
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int lzo1x_1_compress(const unsigned char *in, size_t in_len,
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unsigned char *out, size_t *out_len,
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void *wrkmem)
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{
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const unsigned char *ii;
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const unsigned char *ip = in;
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unsigned char *op = out;
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size_t t;
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size_t l = in_len;
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size_t t = 0;
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if (unlikely(in_len <= M2_MAX_LEN + 5)) {
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t = in_len;
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} else {
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t = _lzo1x_1_do_compress(in, in_len, op, out_len, wrkmem);
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while (l > 20) {
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size_t ll = l <= (M4_MAX_OFFSET + 1) ? l : (M4_MAX_OFFSET + 1);
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uintptr_t ll_end = (uintptr_t) ip + ll;
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if ((ll_end + ((t + ll) >> 5)) <= ll_end)
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break;
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BUILD_BUG_ON(D_SIZE * sizeof(lzo_dict_t) > LZO1X_1_MEM_COMPRESS);
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memset(wrkmem, 0, D_SIZE * sizeof(lzo_dict_t));
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t = lzo1x_1_do_compress(ip, ll, op, out_len, t, wrkmem);
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ip += ll;
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op += *out_len;
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l -= ll;
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}
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t += l;
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|
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if (t > 0) {
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ii = in + in_len - t;
|
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const unsigned char *ii = in + in_len - t;
|
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|
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if (op == out && t <= 238) {
|
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*op++ = (17 + t);
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|
|
@ -198,16 +247,21 @@ int lzo1x_1_compress(const unsigned char *in, size_t in_len, unsigned char *out,
|
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*op++ = (t - 3);
|
||||
} else {
|
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size_t tt = t - 18;
|
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|
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*op++ = 0;
|
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while (tt > 255) {
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tt -= 255;
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*op++ = 0;
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}
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*op++ = tt;
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}
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do {
|
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if (t >= 16) do {
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COPY8(op, ii);
|
||||
COPY8(op + 8, ii + 8);
|
||||
op += 16;
|
||||
ii += 16;
|
||||
t -= 16;
|
||||
} while (t >= 16);
|
||||
if (t > 0) do {
|
||||
*op++ = *ii++;
|
||||
} while (--t > 0);
|
||||
}
|
||||
|
|
@ -223,4 +277,3 @@ EXPORT_SYMBOL_GPL(lzo1x_1_compress);
|
|||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("LZO1X-1 Compressor");
|
||||
|
||||
|
|
|
|||
|
|
@ -1,12 +1,12 @@
|
|||
/*
|
||||
* LZO1X Decompressor from MiniLZO
|
||||
* LZO1X Decompressor from LZO
|
||||
*
|
||||
* Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
|
||||
* Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
|
||||
*
|
||||
* The full LZO package can be found at:
|
||||
* http://www.oberhumer.com/opensource/lzo/
|
||||
*
|
||||
* Changed for kernel use by:
|
||||
* Changed for Linux kernel use by:
|
||||
* Nitin Gupta <nitingupta910@gmail.com>
|
||||
* Richard Purdie <rpurdie@openedhand.com>
|
||||
*/
|
||||
|
|
@ -15,225 +15,207 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#endif
|
||||
|
||||
#include <asm/unaligned.h>
|
||||
#include <linux/lzo.h>
|
||||
#include "lzodefs.h"
|
||||
|
||||
#define HAVE_IP(x, ip_end, ip) ((size_t)(ip_end - ip) < (x))
|
||||
#define HAVE_OP(x, op_end, op) ((size_t)(op_end - op) < (x))
|
||||
#define HAVE_LB(m_pos, out, op) (m_pos < out || m_pos >= op)
|
||||
|
||||
#define COPY4(dst, src) \
|
||||
put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
|
||||
#define HAVE_IP(x) ((size_t)(ip_end - ip) >= (size_t)(x))
|
||||
#define HAVE_OP(x) ((size_t)(op_end - op) >= (size_t)(x))
|
||||
#define NEED_IP(x) if (!HAVE_IP(x)) goto input_overrun
|
||||
#define NEED_OP(x) if (!HAVE_OP(x)) goto output_overrun
|
||||
#define TEST_LB(m_pos) if ((m_pos) < out) goto lookbehind_overrun
|
||||
|
||||
int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
|
||||
unsigned char *out, size_t *out_len)
|
||||
unsigned char *out, size_t *out_len)
|
||||
{
|
||||
unsigned char *op;
|
||||
const unsigned char *ip;
|
||||
size_t t, next;
|
||||
size_t state = 0;
|
||||
const unsigned char *m_pos;
|
||||
const unsigned char * const ip_end = in + in_len;
|
||||
unsigned char * const op_end = out + *out_len;
|
||||
const unsigned char *ip = in, *m_pos;
|
||||
unsigned char *op = out;
|
||||
size_t t;
|
||||
|
||||
*out_len = 0;
|
||||
op = out;
|
||||
ip = in;
|
||||
|
||||
if (unlikely(in_len < 3))
|
||||
goto input_overrun;
|
||||
if (*ip > 17) {
|
||||
t = *ip++ - 17;
|
||||
if (t < 4)
|
||||
if (t < 4) {
|
||||
next = t;
|
||||
goto match_next;
|
||||
if (HAVE_OP(t, op_end, op))
|
||||
goto output_overrun;
|
||||
if (HAVE_IP(t + 1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
do {
|
||||
*op++ = *ip++;
|
||||
} while (--t > 0);
|
||||
goto first_literal_run;
|
||||
}
|
||||
goto copy_literal_run;
|
||||
}
|
||||
|
||||
while ((ip < ip_end)) {
|
||||
for (;;) {
|
||||
t = *ip++;
|
||||
if (t >= 16)
|
||||
goto match;
|
||||
if (t == 0) {
|
||||
if (HAVE_IP(1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
while (*ip == 0) {
|
||||
t += 255;
|
||||
ip++;
|
||||
if (HAVE_IP(1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
}
|
||||
t += 15 + *ip++;
|
||||
}
|
||||
if (HAVE_OP(t + 3, op_end, op))
|
||||
goto output_overrun;
|
||||
if (HAVE_IP(t + 4, ip_end, ip))
|
||||
goto input_overrun;
|
||||
|
||||
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) {
|
||||
if (t < 16) {
|
||||
if (likely(state == 0)) {
|
||||
if (unlikely(t == 0)) {
|
||||
while (unlikely(*ip == 0)) {
|
||||
t += 255;
|
||||
ip++;
|
||||
NEED_IP(1);
|
||||
}
|
||||
t += 15 + *ip++;
|
||||
}
|
||||
t += 3;
|
||||
copy_literal_run:
|
||||
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
|
||||
if (likely(HAVE_IP(t + 15) && HAVE_OP(t + 15))) {
|
||||
const unsigned char *ie = ip + t;
|
||||
unsigned char *oe = op + t;
|
||||
do {
|
||||
COPY8(op, ip);
|
||||
op += 8;
|
||||
ip += 8;
|
||||
COPY8(op, ip);
|
||||
op += 8;
|
||||
ip += 8;
|
||||
} while (ip < ie);
|
||||
ip = ie;
|
||||
op = oe;
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
NEED_OP(t);
|
||||
NEED_IP(t + 3);
|
||||
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;
|
||||
|
||||
if (HAVE_LB(m_pos, out, op))
|
||||
goto lookbehind_overrun;
|
||||
|
||||
if (HAVE_OP(3, op_end, op))
|
||||
goto output_overrun;
|
||||
*op++ = *m_pos++;
|
||||
*op++ = *m_pos++;
|
||||
*op++ = *m_pos;
|
||||
|
||||
goto match_done;
|
||||
|
||||
do {
|
||||
match:
|
||||
if (t >= 64) {
|
||||
m_pos = op - 1;
|
||||
m_pos -= (t >> 2) & 7;
|
||||
m_pos -= *ip++ << 3;
|
||||
t = (t >> 5) - 1;
|
||||
if (HAVE_LB(m_pos, out, op))
|
||||
goto lookbehind_overrun;
|
||||
if (HAVE_OP(t + 3 - 1, op_end, op))
|
||||
goto output_overrun;
|
||||
goto copy_match;
|
||||
} else if (t >= 32) {
|
||||
t &= 31;
|
||||
if (t == 0) {
|
||||
if (HAVE_IP(1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
while (*ip == 0) {
|
||||
t += 255;
|
||||
ip++;
|
||||
if (HAVE_IP(1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
}
|
||||
t += 31 + *ip++;
|
||||
}
|
||||
m_pos = op - 1;
|
||||
m_pos -= get_unaligned_le16(ip) >> 2;
|
||||
ip += 2;
|
||||
} else if (t >= 16) {
|
||||
m_pos = op;
|
||||
m_pos -= (t & 8) << 11;
|
||||
|
||||
t &= 7;
|
||||
if (t == 0) {
|
||||
if (HAVE_IP(1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
while (*ip == 0) {
|
||||
t += 255;
|
||||
ip++;
|
||||
if (HAVE_IP(1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
}
|
||||
t += 7 + *ip++;
|
||||
}
|
||||
m_pos -= get_unaligned_le16(ip) >> 2;
|
||||
ip += 2;
|
||||
if (m_pos == op)
|
||||
goto eof_found;
|
||||
m_pos -= 0x4000;
|
||||
} else {
|
||||
state = 4;
|
||||
continue;
|
||||
} else if (state != 4) {
|
||||
next = t & 3;
|
||||
m_pos = op - 1;
|
||||
m_pos -= t >> 2;
|
||||
m_pos -= *ip++ << 2;
|
||||
|
||||
if (HAVE_LB(m_pos, out, op))
|
||||
goto lookbehind_overrun;
|
||||
if (HAVE_OP(2, op_end, op))
|
||||
goto output_overrun;
|
||||
|
||||
*op++ = *m_pos++;
|
||||
*op++ = *m_pos;
|
||||
goto match_done;
|
||||
}
|
||||
|
||||
if (HAVE_LB(m_pos, out, op))
|
||||
goto lookbehind_overrun;
|
||||
if (HAVE_OP(t + 3 - 1, op_end, op))
|
||||
goto output_overrun;
|
||||
|
||||
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);
|
||||
TEST_LB(m_pos);
|
||||
NEED_OP(2);
|
||||
op[0] = m_pos[0];
|
||||
op[1] = m_pos[1];
|
||||
op += 2;
|
||||
goto match_next;
|
||||
} else {
|
||||
copy_match:
|
||||
*op++ = *m_pos++;
|
||||
*op++ = *m_pos++;
|
||||
next = t & 3;
|
||||
m_pos = op - (1 + M2_MAX_OFFSET);
|
||||
m_pos -= t >> 2;
|
||||
m_pos -= *ip++ << 2;
|
||||
t = 3;
|
||||
}
|
||||
} else if (t >= 64) {
|
||||
next = t & 3;
|
||||
m_pos = op - 1;
|
||||
m_pos -= (t >> 2) & 7;
|
||||
m_pos -= *ip++ << 3;
|
||||
t = (t >> 5) - 1 + (3 - 1);
|
||||
} else if (t >= 32) {
|
||||
t = (t & 31) + (3 - 1);
|
||||
if (unlikely(t == 2)) {
|
||||
while (unlikely(*ip == 0)) {
|
||||
t += 255;
|
||||
ip++;
|
||||
NEED_IP(1);
|
||||
}
|
||||
t += 31 + *ip++;
|
||||
NEED_IP(2);
|
||||
}
|
||||
m_pos = op - 1;
|
||||
next = get_unaligned_le16(ip);
|
||||
ip += 2;
|
||||
m_pos -= next >> 2;
|
||||
next &= 3;
|
||||
} else {
|
||||
m_pos = op;
|
||||
m_pos -= (t & 8) << 11;
|
||||
t = (t & 7) + (3 - 1);
|
||||
if (unlikely(t == 2)) {
|
||||
while (unlikely(*ip == 0)) {
|
||||
t += 255;
|
||||
ip++;
|
||||
NEED_IP(1);
|
||||
}
|
||||
t += 7 + *ip++;
|
||||
NEED_IP(2);
|
||||
}
|
||||
next = get_unaligned_le16(ip);
|
||||
ip += 2;
|
||||
m_pos -= next >> 2;
|
||||
next &= 3;
|
||||
if (m_pos == op)
|
||||
goto eof_found;
|
||||
m_pos -= 0x4000;
|
||||
}
|
||||
TEST_LB(m_pos);
|
||||
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
|
||||
if (op - m_pos >= 8) {
|
||||
unsigned char *oe = op + t;
|
||||
if (likely(HAVE_OP(t + 15))) {
|
||||
do {
|
||||
COPY8(op, m_pos);
|
||||
op += 8;
|
||||
m_pos += 8;
|
||||
COPY8(op, m_pos);
|
||||
op += 8;
|
||||
m_pos += 8;
|
||||
} while (op < oe);
|
||||
op = oe;
|
||||
if (HAVE_IP(6)) {
|
||||
state = next;
|
||||
COPY4(op, ip);
|
||||
op += next;
|
||||
ip += next;
|
||||
continue;
|
||||
}
|
||||
} else {
|
||||
NEED_OP(t);
|
||||
do {
|
||||
*op++ = *m_pos++;
|
||||
} while (--t > 0);
|
||||
} while (op < oe);
|
||||
}
|
||||
match_done:
|
||||
t = ip[-2] & 3;
|
||||
if (t == 0)
|
||||
break;
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
unsigned char *oe = op + t;
|
||||
NEED_OP(t);
|
||||
op[0] = m_pos[0];
|
||||
op[1] = m_pos[1];
|
||||
op += 2;
|
||||
m_pos += 2;
|
||||
do {
|
||||
*op++ = *m_pos++;
|
||||
} while (op < oe);
|
||||
}
|
||||
match_next:
|
||||
if (HAVE_OP(t, op_end, op))
|
||||
goto output_overrun;
|
||||
if (HAVE_IP(t + 1, ip_end, ip))
|
||||
goto input_overrun;
|
||||
|
||||
*op++ = *ip++;
|
||||
if (t > 1) {
|
||||
state = next;
|
||||
t = next;
|
||||
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
|
||||
if (likely(HAVE_IP(6) && HAVE_OP(4))) {
|
||||
COPY4(op, ip);
|
||||
op += t;
|
||||
ip += t;
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
NEED_IP(t + 3);
|
||||
NEED_OP(t);
|
||||
while (t > 0) {
|
||||
*op++ = *ip++;
|
||||
if (t > 2)
|
||||
*op++ = *ip++;
|
||||
t--;
|
||||
}
|
||||
|
||||
t = *ip++;
|
||||
} while (ip < ip_end);
|
||||
}
|
||||
}
|
||||
|
||||
*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));
|
||||
return (t != 3 ? LZO_E_ERROR :
|
||||
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;
|
||||
|
|
|
|||
|
|
@ -1,19 +1,37 @@
|
|||
/*
|
||||
* lzodefs.h -- architecture, OS and compiler specific defines
|
||||
*
|
||||
* Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
|
||||
* Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
|
||||
*
|
||||
* The full LZO package can be found at:
|
||||
* http://www.oberhumer.com/opensource/lzo/
|
||||
*
|
||||
* Changed for kernel use by:
|
||||
* Changed for Linux kernel use by:
|
||||
* Nitin Gupta <nitingupta910@gmail.com>
|
||||
* Richard Purdie <rpurdie@openedhand.com>
|
||||
*/
|
||||
|
||||
#define LZO_VERSION 0x2020
|
||||
#define LZO_VERSION_STRING "2.02"
|
||||
#define LZO_VERSION_DATE "Oct 17 2005"
|
||||
|
||||
#define COPY4(dst, src) \
|
||||
put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
|
||||
#if defined(__x86_64__)
|
||||
#define COPY8(dst, src) \
|
||||
put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
|
||||
#else
|
||||
#define COPY8(dst, src) \
|
||||
COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
|
||||
#endif
|
||||
|
||||
#if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
|
||||
#error "conflicting endian definitions"
|
||||
#elif defined(__x86_64__)
|
||||
#define LZO_USE_CTZ64 1
|
||||
#define LZO_USE_CTZ32 1
|
||||
#elif defined(__i386__) || defined(__powerpc__)
|
||||
#define LZO_USE_CTZ32 1
|
||||
#elif defined(__arm__) && (__LINUX_ARM_ARCH__ >= 5)
|
||||
#define LZO_USE_CTZ32 1
|
||||
#endif
|
||||
|
||||
#define M1_MAX_OFFSET 0x0400
|
||||
#define M2_MAX_OFFSET 0x0800
|
||||
|
|
@ -34,10 +52,8 @@
|
|||
#define M3_MARKER 32
|
||||
#define M4_MARKER 16
|
||||
|
||||
#define D_BITS 14
|
||||
#define D_MASK ((1u << D_BITS) - 1)
|
||||
#define lzo_dict_t unsigned short
|
||||
#define D_BITS 13
|
||||
#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])
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user