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2022-03-06liblzma: Add new output queue (lzma_outq) features.Lasse Collin1-1/+43
Add lzma_outq_clear_cache2() which may leave one buffer allocated in the cache. Add lzma_outq_outbuf_memusage() to get the memory needed for a single lzma_outbuf. This is now used internally in outqueue.c too. Track both the total amount of memory allocated and the amount of memory that is in active use (not in cache). In lzma_outbuf, allow storing the current input position that matches the current output position. This way the main thread can notice when no more output is possible without first providing more input. Allow specifying return code for lzma_outq_read() in a finished lzma_outbuf.
2021-01-09liblzma: Make lzma_outq usable for threaded decompression too.Lasse Collin1-41/+97
Before this commit all output queue buffers were allocated as a single big allocation. Now each buffer is allocated separately when needed. Used buffers are cached to avoid reallocation overhead but the cache will keep only one buffer size at a time. This should make things work OK in the decompression where most of the time the buffer sizes will be the same but with some less common files the buffer sizes may vary. While this should work fine, it's still a bit preliminary and may even get reverted if it turns out to be useless for decompression.
2012-07-17liblzma: Make the use of lzma_allocator const-correct.Lasse Collin1-2/+3
There is a tiny risk of causing breakage: If an application assigns lzma_stream.allocator to a non-const pointer, such code won't compile anymore. I don't know why anyone would do such a thing though, so in practice this shouldn't cause trouble. Thanks to Jan Kratochvil for the patch.
2011-04-11liblzma: Add lzma_stream_encoder_mt() for threaded compression.Lasse Collin1-0/+155
This is the simplest method to do threading, which splits the uncompressed data into blocks and compresses them independently from each other. There's room for improvement especially to reduce the memory usage, but nevertheless, this is a good start.