--- /dev/null
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \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_encoder.h"
+#include "filter_common.h"
+#include "lzma_encoder.h"
+#include "lzma2_encoder.h"
+#include "simple_encoder.h"
+#include "delta_encoder.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);
+
+ /// Calculates the recommended Uncompressed Size for .xz Blocks to
+ /// which the input data can be split to make multithreaded
+ /// encoding possible. If this is NULL, it is assumed that
+ /// the encoder is fast enough with single thread.
+ uint64_t (*block_size)(const void *options);
+
+ /// Tells the size of the Filter Properties field. If options are
+ /// invalid, UINT32_MAX is returned. If this is NULL, props_size_fixed
+ /// is used.
+ lzma_ret (*props_size_get)(uint32_t *size, const void *options);
+ uint32_t props_size_fixed;
+
+ /// Encodes Filter Properties.
+ ///
+ /// \return - LZMA_OK: Properties encoded successfully.
+ /// - LZMA_OPTIONS_ERROR: Unsupported options
+ /// - LZMA_PROG_ERROR: Invalid options or not enough
+ /// output space
+ lzma_ret (*props_encode)(const void *options, uint8_t *out);
+
+} lzma_filter_encoder;
+
+
+static const lzma_filter_encoder encoders[] = {
+#ifdef HAVE_ENCODER_LZMA1
+ {
+ .id = LZMA_FILTER_LZMA1,
+ .init = &lzma_lzma_encoder_init,
+ .memusage = &lzma_lzma_encoder_memusage,
+ .block_size = NULL, // FIXME
+ .props_size_get = NULL,
+ .props_size_fixed = 5,
+ .props_encode = &lzma_lzma_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_LZMA2
+ {
+ .id = LZMA_FILTER_LZMA2,
+ .init = &lzma_lzma2_encoder_init,
+ .memusage = &lzma_lzma2_encoder_memusage,
+ .block_size = &lzma_lzma2_block_size, // FIXME
+ .props_size_get = NULL,
+ .props_size_fixed = 1,
+ .props_encode = &lzma_lzma2_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_X86
+ {
+ .id = LZMA_FILTER_X86,
+ .init = &lzma_simple_x86_encoder_init,
+ .memusage = NULL,
+ .block_size = NULL,
+ .props_size_get = &lzma_simple_props_size,
+ .props_encode = &lzma_simple_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_POWERPC
+ {
+ .id = LZMA_FILTER_POWERPC,
+ .init = &lzma_simple_powerpc_encoder_init,
+ .memusage = NULL,
+ .block_size = NULL,
+ .props_size_get = &lzma_simple_props_size,
+ .props_encode = &lzma_simple_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_IA64
+ {
+ .id = LZMA_FILTER_IA64,
+ .init = &lzma_simple_ia64_encoder_init,
+ .memusage = NULL,
+ .block_size = NULL,
+ .props_size_get = &lzma_simple_props_size,
+ .props_encode = &lzma_simple_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_ARM
+ {
+ .id = LZMA_FILTER_ARM,
+ .init = &lzma_simple_arm_encoder_init,
+ .memusage = NULL,
+ .block_size = NULL,
+ .props_size_get = &lzma_simple_props_size,
+ .props_encode = &lzma_simple_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_ARMTHUMB
+ {
+ .id = LZMA_FILTER_ARMTHUMB,
+ .init = &lzma_simple_armthumb_encoder_init,
+ .memusage = NULL,
+ .block_size = NULL,
+ .props_size_get = &lzma_simple_props_size,
+ .props_encode = &lzma_simple_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_SPARC
+ {
+ .id = LZMA_FILTER_SPARC,
+ .init = &lzma_simple_sparc_encoder_init,
+ .memusage = NULL,
+ .block_size = NULL,
+ .props_size_get = &lzma_simple_props_size,
+ .props_encode = &lzma_simple_props_encode,
+ },
+#endif
+#ifdef HAVE_ENCODER_DELTA
+ {
+ .id = LZMA_FILTER_DELTA,
+ .init = &lzma_delta_encoder_init,
+ .memusage = &lzma_delta_coder_memusage,
+ .block_size = NULL,
+ .props_size_get = NULL,
+ .props_size_fixed = 1,
+ .props_encode = &lzma_delta_props_encode,
+ },
+#endif
+};
+
+
+static const lzma_filter_encoder *
+encoder_find(lzma_vli id)
+{
+ for (size_t i = 0; i < ARRAY_SIZE(encoders); ++i)
+ if (encoders[i].id == id)
+ return encoders + i;
+
+ return NULL;
+}
+
+
+extern LZMA_API(lzma_bool)
+lzma_filter_encoder_is_supported(lzma_vli id)
+{
+ return encoder_find(id) != NULL;
+}
+
+
+extern LZMA_API(lzma_ret)
+lzma_filters_update(lzma_stream *strm, const lzma_filter *filters)
+{
+ if (strm->internal->next.update == NULL)
+ return LZMA_PROG_ERROR;
+
+ // Validate the filter chain.
+ if (lzma_raw_encoder_memusage(filters) == UINT64_MAX)
+ return LZMA_OPTIONS_ERROR;
+
+ // The actual filter chain in the encoder is reversed. Some things
+ // still want the normal order chain, so we provide both.
+ size_t count = 1;
+ while (filters[count].id != LZMA_VLI_UNKNOWN)
+ ++count;
+
+ lzma_filter reversed_filters[LZMA_FILTERS_MAX + 1];
+ for (size_t i = 0; i < count; ++i)
+ reversed_filters[count - i - 1] = filters[i];
+
+ reversed_filters[count].id = LZMA_VLI_UNKNOWN;
+
+ return strm->internal->next.update(strm->internal->next.coder,
+ strm->allocator, filters, reversed_filters);
+}
+
+
+extern lzma_ret
+lzma_raw_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
+ const lzma_filter *options)
+{
+ return lzma_raw_coder_init(next, allocator,
+ options, (lzma_filter_find)(&encoder_find), true);
+}
+
+
+extern LZMA_API(lzma_ret)
+lzma_raw_encoder(lzma_stream *strm, const lzma_filter *options)
+{
+ lzma_next_strm_init(lzma_raw_coder_init, strm, options,
+ (lzma_filter_find)(&encoder_find), true);
+
+ strm->internal->supported_actions[LZMA_RUN] = true;
+ strm->internal->supported_actions[LZMA_SYNC_FLUSH] = true;
+ strm->internal->supported_actions[LZMA_FINISH] = true;
+
+ return LZMA_OK;
+}
+
+
+extern LZMA_API(uint64_t)
+lzma_raw_encoder_memusage(const lzma_filter *filters)
+{
+ return lzma_raw_coder_memusage(
+ (lzma_filter_find)(&encoder_find), filters);
+}
+
+
+extern uint64_t
+lzma_mt_block_size(const lzma_filter *filters)
+{
+ uint64_t max = 0;
+
+ for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i) {
+ const lzma_filter_encoder *const fe
+ = encoder_find(filters[i].id);
+ if (fe->block_size != NULL) {
+ const uint64_t size
+ = fe->block_size(filters[i].options);
+ if (size == 0)
+ return 0;
+
+ if (size > max)
+ max = size;
+ }
+ }
+
+ return max;
+}
+
+
+extern LZMA_API(lzma_ret)
+lzma_properties_size(uint32_t *size, const lzma_filter *filter)
+{
+ const lzma_filter_encoder *const fe = encoder_find(filter->id);
+ if (fe == NULL) {
+ // Unknown filter - if the Filter ID is a proper VLI,
+ // return LZMA_OPTIONS_ERROR instead of LZMA_PROG_ERROR,
+ // because it's possible that we just don't have support
+ // compiled in for the requested filter.
+ return filter->id <= LZMA_VLI_MAX
+ ? LZMA_OPTIONS_ERROR : LZMA_PROG_ERROR;
+ }
+
+ if (fe->props_size_get == NULL) {
+ // No props_size_get() function, use props_size_fixed.
+ *size = fe->props_size_fixed;
+ return LZMA_OK;
+ }
+
+ return fe->props_size_get(size, filter->options);
+}
+
+
+extern LZMA_API(lzma_ret)
+lzma_properties_encode(const lzma_filter *filter, uint8_t *props)
+{
+ const lzma_filter_encoder *const fe = encoder_find(filter->id);
+ if (fe == NULL)
+ return LZMA_PROG_ERROR;
+
+ if (fe->props_encode == NULL)
+ return LZMA_OK;
+
+ return fe->props_encode(filter->options, props);
+}
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