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

xz/src/liblzma/common/filter_decoder.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_decoder.h"
+#include "filter_common.h"
+#include "lzma_decoder.h"
+#include "lzma2_decoder.h"
+#include "simple_decoder.h"
+#include "delta_decoder.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);
+
+        /// Decodes Filter Properties.
+        ///
+        /// \return     - LZMA_OK: Properties decoded successfully.
+        ///             - LZMA_OPTIONS_ERROR: Unsupported properties
+        ///             - LZMA_MEM_ERROR: Memory allocation failed.
+        lzma_ret (*props_decode)(void **options, lzma_allocator *allocator,
+                        const uint8_t *props, size_t props_size);
+
+} lzma_filter_decoder;
+
+
+static const lzma_filter_decoder decoders[] = {
+#ifdef HAVE_DECODER_LZMA1
+        {
+                .id = LZMA_FILTER_LZMA1,
+                .init = &lzma_lzma_decoder_init,
+                .memusage = &lzma_lzma_decoder_memusage,
+                .props_decode = &lzma_lzma_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_LZMA2
+        {
+                .id = LZMA_FILTER_LZMA2,
+                .init = &lzma_lzma2_decoder_init,
+                .memusage = &lzma_lzma2_decoder_memusage,
+                .props_decode = &lzma_lzma2_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_X86
+        {
+                .id = LZMA_FILTER_X86,
+                .init = &lzma_simple_x86_decoder_init,
+                .memusage = NULL,
+                .props_decode = &lzma_simple_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_POWERPC
+        {
+                .id = LZMA_FILTER_POWERPC,
+                .init = &lzma_simple_powerpc_decoder_init,
+                .memusage = NULL,
+                .props_decode = &lzma_simple_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_IA64
+        {
+                .id = LZMA_FILTER_IA64,
+                .init = &lzma_simple_ia64_decoder_init,
+                .memusage = NULL,
+                .props_decode = &lzma_simple_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_ARM
+        {
+                .id = LZMA_FILTER_ARM,
+                .init = &lzma_simple_arm_decoder_init,
+                .memusage = NULL,
+                .props_decode = &lzma_simple_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_ARMTHUMB
+        {
+                .id = LZMA_FILTER_ARMTHUMB,
+                .init = &lzma_simple_armthumb_decoder_init,
+                .memusage = NULL,
+                .props_decode = &lzma_simple_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_SPARC
+        {
+                .id = LZMA_FILTER_SPARC,
+                .init = &lzma_simple_sparc_decoder_init,
+                .memusage = NULL,
+                .props_decode = &lzma_simple_props_decode,
+        },
+#endif
+#ifdef HAVE_DECODER_DELTA
+        {
+                .id = LZMA_FILTER_DELTA,
+                .init = &lzma_delta_decoder_init,
+                .memusage = &lzma_delta_coder_memusage,
+                .props_decode = &lzma_delta_props_decode,
+        },
+#endif
+};
+
+
+static const lzma_filter_decoder *
+decoder_find(lzma_vli id)
+{
+        for (size_t i = 0; i < ARRAY_SIZE(decoders); ++i)
+                if (decoders[i].id == id)
+                        return decoders + i;
+
+        return NULL;
+}
+
+
+extern LZMA_API(lzma_bool)
+lzma_filter_decoder_is_supported(lzma_vli id)
+{
+        return decoder_find(id) != NULL;
+}
+
+
+extern lzma_ret
+lzma_raw_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+                const lzma_filter *options)
+{
+        return lzma_raw_coder_init(next, allocator,
+                        options, (lzma_filter_find)(&decoder_find), false);
+}
+
+
+extern LZMA_API(lzma_ret)
+lzma_raw_decoder(lzma_stream *strm, const lzma_filter *options)
+{
+        lzma_next_strm_init(lzma_raw_decoder_init, strm, options);
+
+        strm->internal->supported_actions[LZMA_RUN] = true;
+        strm->internal->supported_actions[LZMA_FINISH] = true;
+
+        return LZMA_OK;
+}
+
+
+extern LZMA_API(uint64_t)
+lzma_raw_decoder_memusage(const lzma_filter *filters)
+{
+        return lzma_raw_coder_memusage(
+                        (lzma_filter_find)(&decoder_find), filters);
+}
+
+
+extern LZMA_API(lzma_ret)
+lzma_properties_decode(lzma_filter *filter, lzma_allocator *allocator,
+                const uint8_t *props, size_t props_size)
+{
+        // Make it always NULL so that the caller can always safely free() it.
+        filter->options = NULL;
+
+        const lzma_filter_decoder *const fd = decoder_find(filter->id);
+        if (fd == NULL)
+                return LZMA_OPTIONS_ERROR;
+
+        if (fd->props_decode == NULL)
+                return props_size == 0 ? LZMA_OK : LZMA_OPTIONS_ERROR;
+
+        return fd->props_decode(
+                        &filter->options, allocator, props, props_size);
+}