release/src-rt-6.x.4708/tools/misc/xz/src/liblzma/common/filter_decoder.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       filter_decoder.c
   4 /// \brief      Filter ID mapping to filter-specific functions
   5 //
   6 //  Author:     Lasse Collin
   7 //
   8 //  This file has been put into the public domain.
   9 //  You can do whatever you want with this file.
  10 //
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #include "filter_decoder.h"
  14 #include "filter_common.h"
  15 #include "lzma_decoder.h"
  16 #include "lzma2_decoder.h"
  17 #include "simple_decoder.h"
  18 #include "delta_decoder.h"
  19
  20
  21 typedef struct {
  22         /// Filter ID
  23         lzma_vli id;
  24
  25         /// Initializes the filter encoder and calls lzma_next_filter_init()
  26         /// for filters + 1.
  27         lzma_init_function init;
  28
  29         /// Calculates memory usage of the encoder. If the options are
  30         /// invalid, UINT64_MAX is returned.
  31         uint64_t (*memusage)(const void *options);
  32
  33         /// Decodes Filter Properties.
  34         ///
  35         /// \return     - LZMA_OK: Properties decoded successfully.
  36         ///             - LZMA_OPTIONS_ERROR: Unsupported properties
  37         ///             - LZMA_MEM_ERROR: Memory allocation failed.
  38         lzma_ret (*props_decode)(void **options, lzma_allocator *allocator,
  39                         const uint8_t *props, size_t props_size);
  40
  41 } lzma_filter_decoder;
  42
  43
  44 static const lzma_filter_decoder decoders[] = {
  45 #ifdef HAVE_DECODER_LZMA1
  46         {
  47                 .id = LZMA_FILTER_LZMA1,
  48                 .init = &lzma_lzma_decoder_init,
  49                 .memusage = &lzma_lzma_decoder_memusage,
  50                 .props_decode = &lzma_lzma_props_decode,
  51         },
  52 #endif
  53 #ifdef HAVE_DECODER_LZMA2
  54         {
  55                 .id = LZMA_FILTER_LZMA2,
  56                 .init = &lzma_lzma2_decoder_init,
  57                 .memusage = &lzma_lzma2_decoder_memusage,
  58                 .props_decode = &lzma_lzma2_props_decode,
  59         },
  60 #endif
  61 #ifdef HAVE_DECODER_X86
  62         {
  63                 .id = LZMA_FILTER_X86,
  64                 .init = &lzma_simple_x86_decoder_init,
  65                 .memusage = NULL,
  66                 .props_decode = &lzma_simple_props_decode,
  67         },
  68 #endif
  69 #ifdef HAVE_DECODER_POWERPC
  70         {
  71                 .id = LZMA_FILTER_POWERPC,
  72                 .init = &lzma_simple_powerpc_decoder_init,
  73                 .memusage = NULL,
  74                 .props_decode = &lzma_simple_props_decode,
  75         },
  76 #endif
  77 #ifdef HAVE_DECODER_IA64
  78         {
  79                 .id = LZMA_FILTER_IA64,
  80                 .init = &lzma_simple_ia64_decoder_init,
  81                 .memusage = NULL,
  82                 .props_decode = &lzma_simple_props_decode,
  83         },
  84 #endif
  85 #ifdef HAVE_DECODER_ARM
  86         {
  87                 .id = LZMA_FILTER_ARM,
  88                 .init = &lzma_simple_arm_decoder_init,
  89                 .memusage = NULL,
  90                 .props_decode = &lzma_simple_props_decode,
  91         },
  92 #endif
  93 #ifdef HAVE_DECODER_ARMTHUMB
  94         {
  95                 .id = LZMA_FILTER_ARMTHUMB,
  96                 .init = &lzma_simple_armthumb_decoder_init,
  97                 .memusage = NULL,
  98                 .props_decode = &lzma_simple_props_decode,
  99         },
 100 #endif
 101 #ifdef HAVE_DECODER_SPARC
 102         {
 103                 .id = LZMA_FILTER_SPARC,
 104                 .init = &lzma_simple_sparc_decoder_init,
 105                 .memusage = NULL,
 106                 .props_decode = &lzma_simple_props_decode,
 107         },
 108 #endif
 109 #ifdef HAVE_DECODER_DELTA
 110         {
 111                 .id = LZMA_FILTER_DELTA,
 112                 .init = &lzma_delta_decoder_init,
 113                 .memusage = &lzma_delta_coder_memusage,
 114                 .props_decode = &lzma_delta_props_decode,
 115         },
 116 #endif
 117 };
 118
 119
 120 static const lzma_filter_decoder *
 121 decoder_find(lzma_vli id)
 122 {
 123         for (size_t i = 0; i < ARRAY_SIZE(decoders); ++i)
 124                 if (decoders[i].id == id)
 125                         return decoders + i;
 126
 127         return NULL;
 128 }
 129
 130
 131 extern LZMA_API(lzma_bool)
 132 lzma_filter_decoder_is_supported(lzma_vli id)
 133 {
 134         return decoder_find(id) != NULL;
 135 }
 136
 137
 138 extern lzma_ret
 139 lzma_raw_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
 140                 const lzma_filter *options)
 141 {
 142         return lzma_raw_coder_init(next, allocator,
 143                         options, (lzma_filter_find)(&decoder_find), false);
 144 }
 145
 146
 147 extern LZMA_API(lzma_ret)
 148 lzma_raw_decoder(lzma_stream *strm, const lzma_filter *options)
 149 {
 150         lzma_next_strm_init(lzma_raw_decoder_init, strm, options);
 151
 152         strm->internal->supported_actions[LZMA_RUN] = true;
 153         strm->internal->supported_actions[LZMA_FINISH] = true;
 154
 155         return LZMA_OK;
 156 }
 157
 158
 159 extern LZMA_API(uint64_t)
 160 lzma_raw_decoder_memusage(const lzma_filter *filters)
 161 {
 162         return lzma_raw_coder_memusage(
 163                         (lzma_filter_find)(&decoder_find), filters);
 164 }
 165
 166
 167 extern LZMA_API(lzma_ret)
 168 lzma_properties_decode(lzma_filter *filter, lzma_allocator *allocator,
 169                 const uint8_t *props, size_t props_size)
 170 {
 171         // Make it always NULL so that the caller can always safely free() it.
 172         filter->options = NULL;
 173
 174         const lzma_filter_decoder *const fd = decoder_find(filter->id);
 175         if (fd == NULL)
 176                 return LZMA_OPTIONS_ERROR;
 177
 178         if (fd->props_decode == NULL)
 179                 return props_size == 0 ? LZMA_OK : LZMA_OPTIONS_ERROR;
 180
 181         return fd->props_decode(
 182                         &filter->options, allocator, props, props_size);
 183 }