xz: Ignore filter chains that are set but never used in --block-list.
If a filter chain is set but not used in --block-list, it introduced unexpected behavior such as requiring an unneeded amount of memory to compress, reducing the number of threads in multi-threaded encoding, and printing an incorrect amount of memory needed to decompress. This also renames filters_init_mask => filters_used_mask. A filter is assumed to be used if it is specified in --filtersX until coder_set_compression_settings() determines which filters are referenced in --block-list.
This commit is contained in:
Jia Tan
parent
183819bfd9
commit
8b9913a13d
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@ -41,10 +41,13 @@ static lzma_stream strm = LZMA_STREAM_INIT;
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/// the --block-list option.
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static lzma_filter filters[NUM_FILTER_CHAIN_MAX][LZMA_FILTERS_MAX + 1];
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/// Bit mask representing the filters specified through --filtersX. This
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/// is needed to verify that an entry in the --block-list option does not
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/// try to reference a filter chain that was not initialized.
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static uint32_t filters_init_mask = 1;
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/// Bit mask representing the filters that are actually used when encoding
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/// in the xz format. This is needed since a filter chain could be
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/// specified in --filtersX (or the default filter chain), but never used
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/// in --block-list. The default filter chain is always assumed to be used,
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/// unless --block-list is specified and does not have a block using the
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/// default filter chain.
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static uint32_t filters_used_mask = 1;
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#ifdef HAVE_ENCODERS
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/// Track the memory usage for all filter chains (default or --filtersX).
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@ -216,12 +219,12 @@ extern void
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coder_add_block_filters(const char *str, size_t slot)
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{
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// Free old filters first, if they were previously allocated.
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if (filters_init_mask & (1 << slot))
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if (filters_used_mask & (1 << slot))
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lzma_filters_free(filters[slot], NULL);
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str_to_filters(str, slot, 0);
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filters_init_mask |= 1 << slot;
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filters_used_mask |= 1 << slot;
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}
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@ -242,7 +245,7 @@ memlimit_too_small(uint64_t memory_usage)
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static void
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validate_block_list_filter(const uint32_t filter_num)
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{
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if (!(filters_init_mask & (1 << filter_num)))
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if (!(filters_used_mask & (1 << filter_num)))
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message_fatal(_("filter chain %u used by --block-list, but "
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"not specified with --filters%u="),
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(unsigned)filter_num, (unsigned)filter_num);
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@ -267,7 +270,7 @@ filters_memusage_max(const lzma_mt *mt, bool encode)
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#endif
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for (uint32_t i = 0; i < ARRAY_SIZE(filters); i++) {
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if (!(filters_init_mask & (1 << i)))
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if (!(filters_used_mask & (1 << i)))
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continue;
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uint64_t memusage = UINT64_MAX;
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@ -321,16 +324,39 @@ coder_set_compression_settings(void)
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#endif
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#ifdef HAVE_ENCODERS
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if (opt_block_list != NULL)
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if (opt_block_list != NULL) {
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// This mask tracks the filters actually referenced in
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// --block-list. It is used to help remove bits from
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// filters_used_mask when a filter chain was specified
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// but never actually used.
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uint32_t filters_ref_mask = 0;
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for (uint32_t i = 0; opt_block_list[i].size != 0; i++) {
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validate_block_list_filter(
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opt_block_list[i].filters_index);
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// Mark the current filter as referenced.
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filters_ref_mask |= 1 <<
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opt_block_list[i].filters_index;
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# ifdef MYTHREAD_ENABLED
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if (opt_block_list[i].size > max_block_list_size)
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max_block_list_size = opt_block_list[i].size;
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# endif
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}
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assert(filters_ref_mask != 0);
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// Note: The filters that were initialized but not used do
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// not free their options and do not have the filter
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// IDs set to LZMA_VLI_UNKNOWN. Filter chains are not
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// freed outside of debug mode and the default filter
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// chain is never freed.
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filters_used_mask = filters_ref_mask;
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} else {
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// Reset filters used mask in case --block-list is not
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// used, but --filtersX is used.
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filters_used_mask = 1;
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}
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#endif
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// The default check type is CRC64, but fallback to CRC32
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// if CRC64 isn't supported by the copy of liblzma we are
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@ -348,7 +374,7 @@ coder_set_compression_settings(void)
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// filter chain.
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lzma_filter *default_filters = filters[0];
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if (filters_count == 0) {
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if (filters_count == 0 && filters_used_mask & 1) {
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// We are using a preset. This is not a good idea in raw mode
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// except when playing around with things. Different versions
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// of this software may use different options in presets, and
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@ -379,7 +405,9 @@ coder_set_compression_settings(void)
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}
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// If we are using the .lzma format, allow exactly one filter
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// which has to be LZMA1.
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// which has to be LZMA1. There is no need to check if the default
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// filter chain is being used since it can only be disabled if
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// --block-list is used, which is incompatible with FORMAT_LZMA.
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if (opt_format == FORMAT_LZMA && (filters_count != 1
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|| default_filters[0].id != LZMA_FILTER_LZMA1))
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message_fatal(_("The .lzma format supports only "
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@ -387,21 +415,23 @@ coder_set_compression_settings(void)
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// If we are using the .xz format, make sure that there is no LZMA1
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// filter to prevent LZMA_PROG_ERROR.
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if (opt_format == FORMAT_XZ)
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if (opt_format == FORMAT_XZ && filters_used_mask & 1)
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for (size_t i = 0; i < filters_count; ++i)
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if (default_filters[i].id == LZMA_FILTER_LZMA1)
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message_fatal(_("LZMA1 cannot be used "
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"with the .xz format"));
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if (filters_used_mask & 1) {
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// Print the selected default filter chain.
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message_filters_show(V_DEBUG, default_filters);
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}
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// The --flush-timeout option requires LZMA_SYNC_FLUSH support
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// from the filter chain. Currently the threaded encoder doesn't
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// support LZMA_SYNC_FLUSH so single-threaded mode must be used.
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if (opt_mode == MODE_COMPRESS && opt_flush_timeout != 0) {
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for (uint32_t i = 0; i < ARRAY_SIZE(filters); ++i) {
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if (!(filters_init_mask & (1 << i)))
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if (!(filters_used_mask & (1 << i)))
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continue;
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const lzma_filter *fc = filters[i];
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@ -451,7 +481,7 @@ coder_set_compression_settings(void)
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if (block_size == 0) {
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for (uint32_t i = 0; i < ARRAY_SIZE(filters);
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i++) {
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if (!(filters_init_mask & (1 << i)))
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if (!(filters_used_mask & (1 << i)))
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continue;
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uint64_t size = lzma_mt_block_size(
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@ -661,7 +691,7 @@ coder_set_compression_settings(void)
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r->filters = NULL;
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r->reduce_dict_size = false;
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if (!(filters_init_mask & (1 << i)))
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if (!(filters_used_mask & (1 << i)))
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continue;
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for (uint32_t j = 0; filters[i][j].id != LZMA_VLI_UNKNOWN;
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@ -1495,7 +1525,7 @@ coder_free(void)
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// debug mode and will be freed when the process ends anyway, we
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// don't worry about freeing it.
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for (uint32_t i = 1; i < ARRAY_SIZE(filters); i++) {
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if (filters_init_mask & (1 << i))
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if (filters_used_mask & (1 << i))
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lzma_filters_free(filters[i], NULL);
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}
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