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Remove the alignment functions for now. Maybe they will

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be added back in some form later, but the current version
wasn't modular, so it would need fixing anyway.
This commit is contained in:
Lasse Collin 2008-12-17 21:49:53 +02:00
parent 4fed98417d
commit 634636fa56
4 changed files with 0 additions and 176 deletions
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1
src/liblzma/api/Makefile.am
View file

@ -14,7 +14,6 @@
nobase_include_HEADERS = \
lzma.h \
lzma/alignment.h \
lzma/base.h \
lzma/block.h \
lzma/check.h \

1
src/liblzma/api/lzma.h
View file

@ -213,7 +213,6 @@ extern "C" {
#include "lzma/container.h"
/* Advanced features */
#include "lzma/alignment.h" /* FIXME */
#include "lzma/stream_flags.h"
#include "lzma/block.h"
#include "lzma/index.h"

60
src/liblzma/api/lzma/alignment.h
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@ -1,60 +0,0 @@
/**
* \file lzma/alignment.h
* \brief Calculating input and output alignment of filter chains
*
* \author Copyright (C) 1999-2006 Igor Pavlov
* \author 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.
*/
#ifndef LZMA_H_INTERNAL
# error Never include this file directly. Use <lzma.h> instead.
#endif
/**
* \brief Calculates the preferred alignment of the input data
*
* FIXME desc
*/
extern uint32_t lzma_alignment_input(
const lzma_filter *filters, uint32_t guess);
/**
* \brief Calculates the alignment of the encoded output
*
* Knowing the alignment of the output data is useful e.g. in the Block
* encoder which tries to align the Compressed Data field optimally.
*
* \param filters Pointer to lzma_filter array, whose last
* member must have .id = LZMA_VLI_UNKNOWN.
* \param guess The value to return if the alignment of the output
* is the same as the alignment of the input data.
* If you want to always detect this special case,
* this guess to zero; this function never returns
* zero unless guess is zero.
*
* \return In most cases, a small positive integer is returned;
* for optimal use, the encoded output of this filter
* chain should start at on offset that is a multiple of
* the returned integer value.
*
* If the alignment of the output is the same as the input
* data (which this function cannot know), \a guess is
* returned.
*
* If an error occurs (that is, unknown Filter IDs or filter
* options), UINT32_MAX is returned.
*/
extern uint32_t lzma_alignment_output(
const lzma_filter *filters, uint32_t guess);

114
src/liblzma/common/alignment.c
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@ -1,114 +0,0 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \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;
}