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author | Lasse Collin <lasse.collin@tukaani.org> | 2008-08-28 22:53:15 +0300 |
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committer | Lasse Collin <lasse.collin@tukaani.org> | 2008-08-28 22:53:15 +0300 |
commit | 3b34851de1eaf358cf9268922fa0eeed8278d680 (patch) | |
tree | 7bab212af647541df64227a8d350d17a2e789f6b /src/liblzma/lz/match_c.h | |
parent | Fix test_filter_flags to match the new restriction of lc+lp. (diff) | |
download | xz-3b34851de1eaf358cf9268922fa0eeed8278d680.tar.xz |
Sort of garbage collection commit. :-| Many things are still
broken. API has changed a lot and it will still change a
little more here and there. The command line tool doesn't
have all the required changes to reflect the API changes, so
it's easy to get "internal error" or trigger assertions.
Diffstat (limited to '')
-rw-r--r-- | src/liblzma/lz/match_c.h | 412 |
1 files changed, 0 insertions, 412 deletions
diff --git a/src/liblzma/lz/match_c.h b/src/liblzma/lz/match_c.h deleted file mode 100644 index 664db290..00000000 --- a/src/liblzma/lz/match_c.h +++ /dev/null @@ -1,412 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// -/// \file match_c.h -/// \brief Template for different match finders -/// -/// This file is included by hc3.c, hc4, bt2.c, bt3.c and bt4.c. Each file -/// sets slighly different #defines, resulting the different match finders. -// -// Copyright (C) 1999-2006 Igor Pavlov -// Copyright (C) 2007 Lasse Collin -// -// This library is free software; you can redistribute it and/or -// modify it under the terms of the GNU Lesser General Public -// License as published by the Free Software Foundation; either -// version 2.1 of the License, or (at your option) any later version. -// -// This 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 -// Lesser General Public License for more details. -// -/////////////////////////////////////////////////////////////////////////////// - -////////////// -// Includes // -////////////// - -#include "check.h" - - -/////////////// -// Constants // -/////////////// - -#define START_MAX_LEN 1 - -#ifdef HASH_ARRAY_2 -# define NUM_HASH_DIRECT_BYTES 0 -# define HASH_2_SIZE (1 << 10) -# ifdef HASH_ARRAY_3 -# define NUM_HASH_BYTES 4 -# define HASH_3_SIZE (1 << 16) -# define HASH_3_OFFSET HASH_2_SIZE -# define FIX_HASH_SIZE (HASH_2_SIZE + HASH_3_SIZE) -# else -# define NUM_HASH_BYTES 3 -# define FIX_HASH_SIZE HASH_2_SIZE -# endif -# define HASH_SIZE 0 -# define MIN_MATCH_CHECK NUM_HASH_BYTES -#else -# define NUM_HASH_DIRECT_BYTES 2 -# define NUM_HASH_BYTES 2 -# define HASH_SIZE (1 << (8 * NUM_HASH_BYTES)) -# define MIN_MATCH_CHECK (NUM_HASH_BYTES + 1) -# define FIX_HASH_SIZE 0 -#endif - - -//////////// -// Macros // -//////////// - -#ifdef HASH_ARRAY_2 -# ifdef HASH_ARRAY_3 -# define HASH_CALC() \ - do { \ - const uint32_t temp = lzma_crc32_table[0][ \ - cur[0]] ^ cur[1]; \ - hash_2_value = temp & (HASH_2_SIZE - 1); \ - hash_3_value = (temp ^ ((uint32_t)(cur[2]) << 8)) \ - & (HASH_3_SIZE - 1); \ - hash_value = (temp ^ ((uint32_t)(cur[2]) << 8) \ - ^ (lzma_crc32_table[0][cur[3]] << 5)) \ - & lz->hash_mask; \ - } while (0) -# else -# define HASH_CALC() \ - do { \ - const uint32_t temp = lzma_crc32_table[0][ \ - cur[0]] ^ cur[1]; \ - hash_2_value = temp & (HASH_2_SIZE - 1); \ - hash_value = (temp ^ ((uint32_t)(cur[2]) << 8)) \ - & lz->hash_mask; \ - } while (0) -# endif -#else -# define HASH_CALC() hash_value = cur[0] ^ ((uint32_t)(cur[1]) << 8) -#endif - - -// Moves the current read position forward by one byte. In LZMA SDK, -// CLZInWindow::MovePos() can read more input data if needed, because of -// the callback style API. In liblzma we must have ensured earlier, that -// there is enough data available in lz->buffer. -#define move_pos() \ -do { \ - if (++lz->cyclic_buffer_pos == lz->cyclic_buffer_size) \ - lz->cyclic_buffer_pos = 0; \ - ++lz->read_pos; \ - assert(lz->read_pos <= lz->write_pos); \ - if (lz->read_pos == MAX_VAL_FOR_NORMALIZE) \ - lzma_lz_encoder_normalize(lz); \ -} while (0) - - -#define move_pending() \ -do { \ - ++lz->read_pos; \ - assert(lz->read_pos <= lz->write_pos); \ - ++lz->pending; \ -} while (0) - - -////////////////////// -// Global constants // -////////////////////// - -LZMA_HASH_SIZE(LZMA_MATCH_FINDER_NAME_UPPER) = HASH_SIZE; -LZMA_FIX_HASH_SIZE(LZMA_MATCH_FINDER_NAME_UPPER) = FIX_HASH_SIZE; - - -/////////////////// -// API functions // -/////////////////// - -LZMA_GET_MATCHES(LZMA_MATCH_FINDER_NAME_LOWER) -{ - uint32_t len_limit; - if (lz->read_pos + lz->match_max_len <= lz->write_pos) { - len_limit = lz->match_max_len; - } else { - len_limit = lz->write_pos - lz->read_pos; - if (len_limit < MIN_MATCH_CHECK || lz->sequence == SEQ_FLUSH) { - distances[0] = 0; - move_pending(); - return; - } - } - - assert(lz->pending == 0); - - int32_t offset = 1; - const uint32_t match_min_pos - = lz->read_pos + lz->offset > lz->cyclic_buffer_size - ? lz->read_pos + lz->offset - lz->cyclic_buffer_size - : 0; - const uint8_t *cur = lz->buffer + lz->read_pos; - uint32_t max_len = START_MAX_LEN; // to avoid items for len < hash_size - -#ifdef HASH_ARRAY_2 - uint32_t hash_2_value; -# ifdef HASH_ARRAY_3 - uint32_t hash_3_value; -# endif -#endif - uint32_t hash_value; - HASH_CALC(); - - uint32_t cur_match = lz->hash[FIX_HASH_SIZE + hash_value]; -#ifdef HASH_ARRAY_2 - uint32_t cur_match2 = lz->hash[hash_2_value]; -# ifdef HASH_ARRAY_3 - uint32_t cur_match3 = lz->hash[HASH_3_OFFSET + hash_3_value]; -# endif - lz->hash[hash_2_value] = lz->read_pos + lz->offset; - - if (cur_match2 > match_min_pos) { - if (lz->buffer[cur_match2 - lz->offset] == cur[0]) { - max_len = 2; - distances[offset++] = 2; - distances[offset++] = lz->read_pos + lz->offset - - cur_match2 - 1; - } - } - -# ifdef HASH_ARRAY_3 - lz->hash[HASH_3_OFFSET + hash_3_value] = lz->read_pos + lz->offset; - if (cur_match3 > match_min_pos) { - if (lz->buffer[cur_match3 - lz->offset] == cur[0]) { - if (cur_match3 == cur_match2) - offset -= 2; - - max_len = 3; - distances[offset++] = 3; - distances[offset++] = lz->read_pos + lz->offset - - cur_match3 - 1; - cur_match2 = cur_match3; - } - } -# endif - - if (offset != 1 && cur_match2 == cur_match) { - offset -= 2; - max_len = START_MAX_LEN; - } -#endif - - lz->hash[FIX_HASH_SIZE + hash_value] = lz->read_pos + lz->offset; - -#ifdef IS_HASH_CHAIN - lz->son[lz->cyclic_buffer_pos] = cur_match; -#else - uint32_t *ptr0 = lz->son + (lz->cyclic_buffer_pos << 1) + 1; - uint32_t *ptr1 = lz->son + (lz->cyclic_buffer_pos << 1); - - uint32_t len0 = NUM_HASH_DIRECT_BYTES; - uint32_t len1 = NUM_HASH_DIRECT_BYTES; -#endif - -#if NUM_HASH_DIRECT_BYTES != 0 - if (cur_match > match_min_pos) { - if (lz->buffer[cur_match + NUM_HASH_DIRECT_BYTES - lz->offset] - != cur[NUM_HASH_DIRECT_BYTES]) { - max_len = NUM_HASH_DIRECT_BYTES; - distances[offset++] = NUM_HASH_DIRECT_BYTES; - distances[offset++] = lz->read_pos + lz->offset - - cur_match - 1; - } - } -#endif - - uint32_t count = lz->cut_value; - - while (true) { - if (cur_match <= match_min_pos || count-- == 0) { -#ifndef IS_HASH_CHAIN - *ptr0 = EMPTY_HASH_VALUE; - *ptr1 = EMPTY_HASH_VALUE; -#endif - break; - } - - const uint32_t delta = lz->read_pos + lz->offset - cur_match; - const uint32_t cyclic_pos = delta <= lz->cyclic_buffer_pos - ? lz->cyclic_buffer_pos - delta - : lz->cyclic_buffer_pos - delta - + lz->cyclic_buffer_size; - uint32_t *pair = lz->son + -#ifdef IS_HASH_CHAIN - cyclic_pos; -#else - (cyclic_pos << 1); -#endif - - const uint8_t *pb = lz->buffer + cur_match - lz->offset; - uint32_t len = -#ifdef IS_HASH_CHAIN - NUM_HASH_DIRECT_BYTES; - if (pb[max_len] == cur[max_len]) -#else - MIN(len0, len1); -#endif - - if (pb[len] == cur[len]) { - while (++len != len_limit) - if (pb[len] != cur[len]) - break; - - if (max_len < len) { - max_len = len; - distances[offset++] = len; - distances[offset++] = delta - 1; - if (len == len_limit) { -#ifndef IS_HASH_CHAIN - *ptr1 = pair[0]; - *ptr0 = pair[1]; -#endif - break; - } - } - } - -#ifdef IS_HASH_CHAIN - cur_match = *pair; -#else - if (pb[len] < cur[len]) { - *ptr1 = cur_match; - ptr1 = pair + 1; - cur_match = *ptr1; - len1 = len; - } else { - *ptr0 = cur_match; - ptr0 = pair; - cur_match = *ptr0; - len0 = len; - } -#endif - } - - distances[0] = offset - 1; - - move_pos(); - - return; -} - - -LZMA_SKIP(LZMA_MATCH_FINDER_NAME_LOWER) -{ - do { -#ifdef IS_HASH_CHAIN - if (lz->write_pos - lz->read_pos < NUM_HASH_BYTES) { - move_pending(); - continue; - } -#else - uint32_t len_limit; - if (lz->read_pos + lz->match_max_len <= lz->write_pos) { - len_limit = lz->match_max_len; - } else { - len_limit = lz->write_pos - lz->read_pos; - if (len_limit < MIN_MATCH_CHECK - || lz->sequence == SEQ_FLUSH) { - move_pending(); - continue; - } - } - const uint32_t match_min_pos - = lz->read_pos + lz->offset > lz->cyclic_buffer_size - ? lz->read_pos + lz->offset - lz->cyclic_buffer_size - : 0; -#endif - - assert(lz->pending == 0); - - const uint8_t *cur = lz->buffer + lz->read_pos; - -#ifdef HASH_ARRAY_2 - uint32_t hash_2_value; -# ifdef HASH_ARRAY_3 - uint32_t hash_3_value; - uint32_t hash_value; - HASH_CALC(); - lz->hash[HASH_3_OFFSET + hash_3_value] - = lz->read_pos + lz->offset; -# else - uint32_t hash_value; - HASH_CALC(); -# endif - lz->hash[hash_2_value] = lz->read_pos + lz->offset; -#else - uint32_t hash_value; - HASH_CALC(); -#endif - - uint32_t cur_match = lz->hash[FIX_HASH_SIZE + hash_value]; - lz->hash[FIX_HASH_SIZE + hash_value] - = lz->read_pos + lz->offset; - -#ifdef IS_HASH_CHAIN - lz->son[lz->cyclic_buffer_pos] = cur_match; -#else - uint32_t *ptr0 = lz->son + (lz->cyclic_buffer_pos << 1) + 1; - uint32_t *ptr1 = lz->son + (lz->cyclic_buffer_pos << 1); - - uint32_t len0 = NUM_HASH_DIRECT_BYTES; - uint32_t len1 = NUM_HASH_DIRECT_BYTES; - uint32_t count = lz->cut_value; - - while (true) { - if (cur_match <= match_min_pos || count-- == 0) { - *ptr0 = EMPTY_HASH_VALUE; - *ptr1 = EMPTY_HASH_VALUE; - break; - } - - const uint32_t delta = lz->read_pos - + lz->offset - cur_match; - const uint32_t cyclic_pos - = delta <= lz->cyclic_buffer_pos - ? lz->cyclic_buffer_pos - delta - : lz->cyclic_buffer_pos - delta - + lz->cyclic_buffer_size; - uint32_t *pair = lz->son + (cyclic_pos << 1); - - const uint8_t *pb = lz->buffer + cur_match - - lz->offset; - uint32_t len = MIN(len0, len1); - - if (pb[len] == cur[len]) { - while (++len != len_limit) - if (pb[len] != cur[len]) - break; - - if (len == len_limit) { - *ptr1 = pair[0]; - *ptr0 = pair[1]; - break; - } - } - - if (pb[len] < cur[len]) { - *ptr1 = cur_match; - ptr1 = pair + 1; - cur_match = *ptr1; - len1 = len; - } else { - *ptr0 = cur_match; - ptr0 = pair; - cur_match = *ptr0; - len0 = len; - } - } -#endif - - move_pos(); - - } while (--num != 0); - - return; -} |