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7zip/DOC/lzma.txt  view on Meta::CPAN

Lzma Encoder can use two memory allocators:
1) alloc - for small arrays.
2) allocBig - for big arrays.

For example, you can use Large RAM Pages (2 MB) in allocBig allocator for 
better compression speed. Note that Windows has bad implementation for 
Large RAM Pages. 
It's OK to use same allocator for alloc and allocBig.


Single-call Compression with callbacks
--------------------------------------

Check C/LzmaUtil/LzmaUtil.c as example, 

When to use: file->file decompressing 

1) you must implement callback structures for interfaces:
ISeqInStream
ISeqOutStream
ICompressProgress

7zip/DOC/lzma.txt  view on Meta::CPAN

  LzmaEnc_Destroy(enc, &g_Alloc, &g_Alloc);


If callback function return some error code, LzmaEnc_Encode also returns that code
or it can return the code like SZ_ERROR_READ, SZ_ERROR_WRITE or SZ_ERROR_PROGRESS.


Single-call RAM->RAM Compression
--------------------------------

Single-call RAM->RAM Compression is similar to Compression with callbacks,
but you provide pointers to buffers instead of pointers to stream callbacks:

HRes LzmaEncode(Byte *dest, SizeT *destLen, const Byte *src, SizeT srcLen,
    CLzmaEncProps *props, Byte *propsEncoded, SizeT *propsSize, int writeEndMark, 
    ICompressProgress *progress, ISzAlloc *alloc, ISzAlloc *allocBig);

Return code:
  SZ_OK               - OK
  SZ_ERROR_MEM        - Memory allocation error 
  SZ_ERROR_PARAM      - Incorrect paramater
  SZ_ERROR_OUTPUT_EOF - output buffer overflow