Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/liblzma/common/filter_encoder.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \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 minimum sane size for Blocks (or other types of
+        /// chunks) 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.
+        lzma_vli (*chunk_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,
+                .chunk_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,
+                .chunk_size = NULL, // 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,
+                .chunk_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,
+                .chunk_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,
+                .chunk_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,
+                .chunk_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,
+                .chunk_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,
+                .chunk_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,
+                .chunk_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, 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 LZMA_API(lzma_vli)
+lzma_chunk_size(const lzma_filter *filters)
+{
+        lzma_vli 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->chunk_size != NULL) {
+                        const lzma_vli size
+                                        = fe->chunk_size(filters[i].options);
+                        if (size == LZMA_VLI_UNKNOWN)
+                                return LZMA_VLI_UNKNOWN;
+
+                        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);
+}