liblzma: Add new API function lzma_filters_free().
This is small but convenient and should have been added a long time ago.
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src/liblzma
@ -124,6 +124,27 @@ extern LZMA_API(lzma_ret) lzma_filters_copy(
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Free the options in the array of lzma_filter structures
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*
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* This frees the filter chain options. The filters array itself is not freed.
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*
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* The filters array must have at most LZMA_FILTERS_MAX + 1 elements
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* including the terminating element which must have .id = LZMA_VLI_UNKNOWN.
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* For all elements before the terminating element:
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* - options will be freed using the given lzma_allocator or,
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* if allocator is NULL, using free().
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* - options will be set to NULL.
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* - id will be set to LZMA_VLI_UNKNOWN.
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*
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* If filters is NULL, this does nothing but remember that this never frees
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* the filters array itself.
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*/
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extern LZMA_API(void) lzma_filters_free(
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lzma_filter *filters, const lzma_allocator *allocator)
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lzma_nothrow;
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/**
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* \brief Calculate approximate memory requirements for raw encoder
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*
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@ -205,6 +205,32 @@ error:
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}
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extern LZMA_API(void)
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lzma_filters_free(lzma_filter *filters, const lzma_allocator *allocator)
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{
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if (filters == NULL)
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return;
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for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i) {
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if (i == LZMA_FILTERS_MAX) {
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// The API says that LZMA_FILTERS_MAX + 1 is the
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// maximum allowed size including the terminating
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// element. Thus, we should never get here but in
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// case there is a bug and we do anyway, don't go
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// past the (probable) end of the array.
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assert(0);
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break;
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}
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lzma_free(filters[i].options, allocator);
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filters[i].options = NULL;
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filters[i].id = LZMA_VLI_UNKNOWN;
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}
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return;
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}
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static lzma_ret
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validate_chain(const lzma_filter *filters, size_t *count)
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{
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@ -114,4 +114,5 @@ global:
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lzma_file_info_decoder;
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lzma_stream_decoder_mt;
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lzma_lzip_decoder;
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lzma_filters_free;
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} XZ_5.2;
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@ -129,4 +129,5 @@ global:
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lzma_file_info_decoder;
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lzma_stream_decoder_mt;
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lzma_lzip_decoder;
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lzma_filters_free;
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} XZ_5.2;
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