03_compress_custom.c		03_compress_custom.c
	skipping to change at line 30		skipping to change at line 30
	#include <string.h>		#include <string.h>
	#include <errno.h>		#include <errno.h>
	#include <lzma.h>		#include <lzma.h>
	static bool		static bool
	init_encoder(lzma_stream *strm)		init_encoder(lzma_stream *strm)
	{		{
	// Use the default preset (6) for LZMA2.		// Use the default preset (6) for LZMA2.
	//		//
	// The lzma_options_lzma structure and the lzma_lzma_preset() functi on		// The lzma_options_lzma structure and the lzma_lzma_preset() functi on
	// are declared in lzma/lzma.h (src/liblzma/api/lzma/lzma.h in the		// are declared in lzma/lzma12.h (src/liblzma/api/lzma/lzma12.h in t
	// source package or e.g. /usr/include/lzma/lzma.h depending on		he
			// source package or e.g. /usr/include/lzma/lzma12.h depending on
	// the install prefix).		// the install prefix).
	lzma_options_lzma opt_lzma2;		lzma_options_lzma opt_lzma2;
	if (lzma_lzma_preset(&opt_lzma2, LZMA_PRESET_DEFAULT)) {		if (lzma_lzma_preset(&opt_lzma2, LZMA_PRESET_DEFAULT)) {
	// It should never fail because the default preset		// It should never fail because the default preset
	// (and presets 0-9 optionally with LZMA_PRESET_EXTREME)		// (and presets 0-9 optionally with LZMA_PRESET_EXTREME)
	// are supported by all stable liblzma versions.		// are supported by all stable liblzma versions.
	//		//
	// (The encoder initialization later in this function may		// (The encoder initialization later in this function may
	// still fail due to unsupported preset *if* the features		// still fail due to unsupported preset *if* the features
	// required by the preset have been disabled at build time,		// required by the preset have been disabled at build time,
	// but no-one does such things except on embedded systems.)		// but no-one does such things except on embedded systems.)
	fprintf(stderr, "Unsupported preset, possibly a bug\n");		fprintf(stderr, "Unsupported preset, possibly a bug\n");
	return false;		return false;
	}		}
	// Now we could customize the LZMA2 options if we wanted. For exampl e,		// Now we could customize the LZMA2 options if we wanted. For exampl e,
	// we could set the the dictionary size (opt_lzma2.dict_size) to		// we could set the the dictionary size (opt_lzma2.dict_size) to
	// something else than the default (8 MiB) of the default preset.		// something else than the default (8 MiB) of the default preset.
	// See lzma/lzma.h for details of all LZMA2 options.		// See lzma/lzma12.h for details of all LZMA2 options.
	//		//
	// The x86 BCJ filter will try to modify the x86 instruction stream so		// The x86 BCJ filter will try to modify the x86 instruction stream so
	// that LZMA2 can compress it better. The x86 BCJ filter doesn't nee d		// that LZMA2 can compress it better. The x86 BCJ filter doesn't nee d
	// any options so it will be set to NULL below.		// any options so it will be set to NULL below.
	//		//
	// Construct the filter chain. The uncompressed data goes first to		// Construct the filter chain. The uncompressed data goes first to
	// the first filter in the array, in this case the x86 BCJ filter.		// the first filter in the array, in this case the x86 BCJ filter.
	// The array is always terminated by setting .id = LZMA_VLI_UNKNOWN.		// The array is always terminated by setting .id = LZMA_VLI_UNKNOWN.
	//		//
	// See lzma/filter.h for more information about the lzma_filter		// See lzma/filter.h for more information about the lzma_filter
End of changes. 2 change blocks.
	3 lines changed or deleted		4 lines changed or added
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