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///////////////////////////////////////////////////////////////////////////////
//
/// \file alignment.c
/// \brief Calculates preferred alignments of different filters
//
// Copyright (C) 2007 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#include "common.h"
extern LZMA_API uint32_t
lzma_alignment_input(const lzma_filter *filters, uint32_t guess)
{
for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i) {
switch (filters[i].id) {
case LZMA_FILTER_DELTA:
// The same as the input, check the next filter.
continue;
case LZMA_FILTER_SUBBLOCK:
if (filters[i].options == NULL)
return LZMA_SUBBLOCK_ALIGNMENT_DEFAULT;
else
return ((const lzma_options_subblock *)(
filters[i].options))->alignment;
case LZMA_FILTER_X86:
return 1;
case LZMA_FILTER_ARMTHUMB:
return 2;
case LZMA_FILTER_POWERPC:
case LZMA_FILTER_ARM:
case LZMA_FILTER_SPARC:
return 4;
case LZMA_FILTER_IA64:
return 16;
case LZMA_FILTER_LZMA1: {
const lzma_options_lzma *lzma = filters[i].options;
return 1 << MAX(lzma->pb, lzma->lp);
}
default:
return UINT32_MAX;
}
}
return guess;
}
extern LZMA_API uint32_t
lzma_alignment_output(const lzma_filter *filters, uint32_t guess)
{
if (filters[0].id == LZMA_VLI_UNKNOWN)
return UINT32_MAX;
// Find the last filter in the chain.
size_t i = 0;
while (filters[i + 1].id != LZMA_VLI_UNKNOWN)
++i;
do {
switch (filters[i].id) {
case LZMA_FILTER_DELTA:
// It's the same as the input alignment, so
// check the next filter.
continue;
case LZMA_FILTER_SUBBLOCK:
if (filters[i].options == NULL)
return LZMA_SUBBLOCK_ALIGNMENT_DEFAULT;
else
return ((const lzma_options_subblock *)(
filters[i].options))->alignment;
case LZMA_FILTER_X86:
case LZMA_FILTER_LZMA1:
return 1;
case LZMA_FILTER_ARMTHUMB:
return 2;
case LZMA_FILTER_POWERPC:
case LZMA_FILTER_ARM:
case LZMA_FILTER_SPARC:
return 4;
case LZMA_FILTER_IA64:
return 16;
default:
return UINT32_MAX;
}
} while (i-- != 0);
// If we get here, we have the same alignment as the input data.
return guess;
}
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