/* Lzma86Dec.c -- LZMA + x86 (BCJ) Filter Decoder
2016-05-16 : Igor Pavlov : Public domain */

#include "Precomp.h"

#include "Lzma86.h"

#include "Alloc.h"
#include "Bra.h"
#include "LzmaDec.h"

SRes Lzma86_GetUnpackSize(const Byte* src, SizeT srcLen, UInt64* unpackSize)
{
    unsigned i;
    if (srcLen < LZMA86_HEADER_SIZE)
        return SZ_ERROR_INPUT_EOF;
    *unpackSize = 0;
    for (i = 0; i < sizeof(UInt64); i++)
        *unpackSize += ((UInt64)src[LZMA86_SIZE_OFFSET + i]) << (8 * i);
    return SZ_OK;
}

SRes Lzma86_Decode(Byte* dest, SizeT* destLen, const Byte* src, SizeT* srcLen)
{
    SRes res;
    int useFilter;
    SizeT inSizePure;
    ELzmaStatus status;

    if (*srcLen < LZMA86_HEADER_SIZE)
        return SZ_ERROR_INPUT_EOF;

    useFilter = src[0];

    if (useFilter > 1)
    {
        *destLen = 0;
        return SZ_ERROR_UNSUPPORTED;
    }

    inSizePure = *srcLen - LZMA86_HEADER_SIZE;
    res = LzmaDecode(dest, destLen, src + LZMA86_HEADER_SIZE, &inSizePure,
        src + 1, LZMA_PROPS_SIZE, LZMA_FINISH_ANY, &status, &g_Alloc);
    *srcLen = inSizePure + LZMA86_HEADER_SIZE;
    if (res != SZ_OK)
        return res;
    if (useFilter == 1)
    {
        UInt32 x86State;
        x86_Convert_Init(x86State);
        x86_Convert(dest, *destLen, 0, &x86State, 0);
    }
    return SZ_OK;
}
