root/src/liblzma/common/filter_decoder.c

DEFINITIONS

1. decoder_find
2. LZMA_API
3. lzma_raw_decoder_init
4. LZMA_API
5. LZMA_API
6. LZMA_API

///////////////////////////////////////////////////////////////////////////////
//
/// \file       filter_decoder.c
/// \brief      Filter ID mapping to filter-specific functions
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "filter_decoder.h"
#include "filter_common.h"
#include "lzma_decoder.h"
#include "lzma2_decoder.h"
#include "simple_decoder.h"
#include "delta_decoder.h"


typedef struct {
        /// Filter ID
        lzma_vli id;

        /// Initializes the filter encoder and calls lzma_next_filter_init()
        /// for filters + 1.
        lzma_init_function init;

        /// Calculates memory usage of the encoder. If the options are
        /// invalid, UINT64_MAX is returned.
        uint64_t (*memusage)(const void *options);

        /// Decodes Filter Properties.
        ///
        /// \return     - LZMA_OK: Properties decoded successfully.
        ///             - LZMA_OPTIONS_ERROR: Unsupported properties
        ///             - LZMA_MEM_ERROR: Memory allocation failed.
        lzma_ret (*props_decode)(void **options, lzma_allocator *allocator,
                        const uint8_t *props, size_t props_size);

} lzma_filter_decoder;


static const lzma_filter_decoder decoders[] = {
#ifdef HAVE_DECODER_LZMA1
        {
                .id = LZMA_FILTER_LZMA1,
                .init = &lzma_lzma_decoder_init,
                .memusage = &lzma_lzma_decoder_memusage,
                .props_decode = &lzma_lzma_props_decode,
        },
#endif
#ifdef HAVE_DECODER_LZMA2
        {
                .id = LZMA_FILTER_LZMA2,
                .init = &lzma_lzma2_decoder_init,
                .memusage = &lzma_lzma2_decoder_memusage,
                .props_decode = &lzma_lzma2_props_decode,
        },
#endif
#ifdef HAVE_DECODER_X86
        {
                .id = LZMA_FILTER_X86,
                .init = &lzma_simple_x86_decoder_init,
                .memusage = NULL,
                .props_decode = &lzma_simple_props_decode,
        },
#endif
#ifdef HAVE_DECODER_POWERPC
        {
                .id = LZMA_FILTER_POWERPC,
                .init = &lzma_simple_powerpc_decoder_init,
                .memusage = NULL,
                .props_decode = &lzma_simple_props_decode,
        },
#endif
#ifdef HAVE_DECODER_IA64
        {
                .id = LZMA_FILTER_IA64,
                .init = &lzma_simple_ia64_decoder_init,
                .memusage = NULL,
                .props_decode = &lzma_simple_props_decode,
        },
#endif
#ifdef HAVE_DECODER_ARM
        {
                .id = LZMA_FILTER_ARM,
                .init = &lzma_simple_arm_decoder_init,
                .memusage = NULL,
                .props_decode = &lzma_simple_props_decode,
        },
#endif
#ifdef HAVE_DECODER_ARMTHUMB
        {
                .id = LZMA_FILTER_ARMTHUMB,
                .init = &lzma_simple_armthumb_decoder_init,
                .memusage = NULL,
                .props_decode = &lzma_simple_props_decode,
        },
#endif
#ifdef HAVE_DECODER_SPARC
        {
                .id = LZMA_FILTER_SPARC,
                .init = &lzma_simple_sparc_decoder_init,
                .memusage = NULL,
                .props_decode = &lzma_simple_props_decode,
        },
#endif
#ifdef HAVE_DECODER_DELTA
        {
                .id = LZMA_FILTER_DELTA,
                .init = &lzma_delta_decoder_init,
                .memusage = &lzma_delta_coder_memusage,
                .props_decode = &lzma_delta_props_decode,
        },
#endif
};


static const lzma_filter_decoder *
decoder_find(lzma_vli id)
{
        for (size_t i = 0; i < ARRAY_SIZE(decoders); ++i)
                if (decoders[i].id == id)
                        return decoders + i;

        return NULL;
}


extern LZMA_API(lzma_bool)
lzma_filter_decoder_is_supported(lzma_vli id)
{
        return decoder_find(id) != NULL;
}


extern lzma_ret
lzma_raw_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
                const lzma_filter *options)
{
        return lzma_raw_coder_init(next, allocator,
                        options, (lzma_filter_find)(&decoder_find), false);
}


extern LZMA_API(lzma_ret)
lzma_raw_decoder(lzma_stream *strm, const lzma_filter *options)
{
        lzma_next_strm_init(lzma_raw_decoder_init, strm, options);

        strm->internal->supported_actions[LZMA_RUN] = true;
        strm->internal->supported_actions[LZMA_FINISH] = true;

        return LZMA_OK;
}


extern LZMA_API(uint64_t)
lzma_raw_decoder_memusage(const lzma_filter *filters)
{
        return lzma_raw_coder_memusage(
                        (lzma_filter_find)(&decoder_find), filters);
}


extern LZMA_API(lzma_ret)
lzma_properties_decode(lzma_filter *filter, lzma_allocator *allocator,
                const uint8_t *props, size_t props_size)
{
        // Make it always NULL so that the caller can always safely free() it.
        filter->options = NULL;

        const lzma_filter_decoder *const fd = decoder_find(filter->id);
        if (fd == NULL)
                return LZMA_OPTIONS_ERROR;

        if (fd->props_decode == NULL)
                return props_size == 0 ? LZMA_OK : LZMA_OPTIONS_ERROR;

        return fd->props_decode(
                        &filter->options, allocator, props, props_size);
}