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xz: Use lzma_filters_free() in forget_filter_chain().

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This is a little cleaner than the previous implementation of
forget_filter_chain(). It is also more consistent since
lzma_str_to_filters() will always terminate the filter chain so there
is no need to terminate it later in coder_set_compression_settings().
This commit is contained in:
Jia Tan 2023-05-13 19:36:09 +08:00
parent 3d21da5cff
commit 072d292501
1 changed files with 11 additions and 9 deletions
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16
src/xz/coder.c
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@ -84,10 +84,9 @@ forget_filter_chain(void)
{ {
// Setting a preset or using --filters makes us forget // Setting a preset or using --filters makes us forget
// the earlier custom filter chain (if any). // the earlier custom filter chain (if any).
while (filters_count > 0) { if (filters_count > 0) {
--filters_count; lzma_filters_free(filters, NULL);
free(filters[filters_count].options); filters_count = 0;
filters[filters_count].options = NULL;
} }
string_to_filter_used = false; string_to_filter_used = false;
@ -125,7 +124,9 @@ coder_add_filter(lzma_vli id, void *options)
filters[filters_count].id = id; filters[filters_count].id = id;
filters[filters_count].options = options; filters[filters_count].options = options;
++filters_count; // Terminate the filter chain with LZMA_VLI_UNKNOWN to simplify
// implementation of forget_filter_chain().
filters[++filters_count].id = LZMA_VLI_UNKNOWN;
// Setting a custom filter chain makes us forget the preset options. // Setting a custom filter chain makes us forget the preset options.
// This makes a difference if one specifies e.g. "xz -9 --lzma2 -e" // This makes a difference if one specifies e.g. "xz -9 --lzma2 -e"
@ -234,11 +235,12 @@ coder_set_compression_settings(void)
filters[0].id = opt_format == FORMAT_LZMA filters[0].id = opt_format == FORMAT_LZMA
? LZMA_FILTER_LZMA1 : LZMA_FILTER_LZMA2; ? LZMA_FILTER_LZMA1 : LZMA_FILTER_LZMA2;
filters[0].options = &opt_lzma; filters[0].options = &opt_lzma;
filters_count = 1; filters_count = 1;
}
// Terminate the filter options array. // Terminate the filter options array.
filters[filters_count].id = LZMA_VLI_UNKNOWN; filters[1].id = LZMA_VLI_UNKNOWN;
}
// If we are using the .lzma format, allow exactly one filter // If we are using the .lzma format, allow exactly one filter
// which has to be LZMA1. // which has to be LZMA1.