lzma2_decoder.h File Reference

LZMA2 decoder. More...

#include "common.h"

Go to the source code of this file.

Functions
lzma_ret	lzma_lzma2_decoder_init (lzma_next_coder *next, const lzma_allocator *allocator, const lzma_filter_info *filters)
uint64_t	lzma_lzma2_decoder_memusage (const void *options)
lzma_ret	lzma_lzma2_props_decode (void **options, const lzma_allocator *allocator, const uint8_t *props, size_t props_size)

Detailed Description

LZMA2 decoder.

Definition in file lzma2_decoder.h.

Function Documentation

lzma_lzma2_decoder_init()

lzma_ret lzma_lzma2_decoder_init	(	lzma_next_coder *	next,
		const lzma_allocator *	allocator,
		const lzma_filter_info *	filters
	)

Definition at line 257 of file lzma2_decoder.c.

{
    // LZMA2 can only be the last filter in the chain. This is enforced
    // by the raw_decoder initialization.
    assert(filters[1].init == NULL);
 
    return lzma_lz_decoder_init(next, allocator, filters,
            &lzma2_decoder_init);
}

References allocator, assert(), filters, init, lzma2_decoder_init(), lzma_lz_decoder_init(), and NULL.

lzma_lzma2_decoder_memusage()

uint64_t lzma_lzma2_decoder_memusage

(

const void *

options

)

Definition at line 270 of file lzma2_decoder.c.

{
    return sizeof(lzma_lzma2_coder)
            + lzma_lzma_decoder_memusage_nocheck(options);
}

References lzma_lzma_decoder_memusage_nocheck(), and options.

lzma_lzma2_props_decode()

lzma_ret lzma_lzma2_props_decode	(	void **	options,
		const lzma_allocator *	allocator,
		const uint8_t *	props,
		size_t	props_size
	)

Definition at line 278 of file lzma2_decoder.c.

{
    if (props_size != 1)
        return LZMA_OPTIONS_ERROR;
 
    // Check that reserved bits are unset.
    if (props[0] & 0xC0)
        return LZMA_OPTIONS_ERROR;
 
    // Decode the dictionary size.
    if (props[0] > 40)
        return LZMA_OPTIONS_ERROR;
 
    lzma_options_lzma *opt = lzma_alloc(
            sizeof(lzma_options_lzma), allocator);
    if (opt == NULL)
        return LZMA_MEM_ERROR;
 
    if (props[0] == 40) {
        opt->dict_size = UINT32_MAX;
    } else {
        opt->dict_size = 2 | (props[0] & 1U);
        opt->dict_size <<= props[0] / 2U + 11;
    }
 
    opt->preset_dict = NULL;
    opt->preset_dict_size = 0;
 
    *options = opt;
 
    return LZMA_OK;
}