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

xz/src/liblzma/common/alone_encoder.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       alone_decoder.c
+/// \brief      Decoder for LZMA_Alone files
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "common.h"
+#include "lzma_encoder.h"
+
+
+#define ALONE_HEADER_SIZE (1 + 4 + 8)
+
+
+struct lzma_coder_s {
+        lzma_next_coder next;
+
+        enum {
+                SEQ_HEADER,
+                SEQ_CODE,
+        } sequence;
+
+        size_t header_pos;
+        uint8_t header[ALONE_HEADER_SIZE];
+};
+
+
+static lzma_ret
+alone_encode(lzma_coder *coder,
+                lzma_allocator *allocator lzma_attribute((unused)),
+                const uint8_t *restrict in, size_t *restrict in_pos,
+                size_t in_size, uint8_t *restrict out,
+                size_t *restrict out_pos, size_t out_size,
+                lzma_action action)
+{
+        while (*out_pos < out_size)
+        switch (coder->sequence) {
+        case SEQ_HEADER:
+                lzma_bufcpy(coder->header, &coder->header_pos,
+                                ALONE_HEADER_SIZE,
+                                out, out_pos, out_size);
+                if (coder->header_pos < ALONE_HEADER_SIZE)
+                        return LZMA_OK;
+
+                coder->sequence = SEQ_CODE;
+                break;
+
+        case SEQ_CODE:
+                return coder->next.code(coder->next.coder,
+                                allocator, in, in_pos, in_size,
+                                out, out_pos, out_size, action);
+
+        default:
+                assert(0);
+                return LZMA_PROG_ERROR;
+        }
+
+        return LZMA_OK;
+}
+
+
+static void
+alone_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
+{
+        lzma_next_end(&coder->next, allocator);
+        lzma_free(coder, allocator);
+        return;
+}
+
+
+// At least for now, this is not used by any internal function.
+static lzma_ret
+alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+                const lzma_options_lzma *options)
+{
+        lzma_next_coder_init(&alone_encoder_init, next, allocator);
+
+        if (next->coder == NULL) {
+                next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
+                if (next->coder == NULL)
+                        return LZMA_MEM_ERROR;
+
+                next->code = &alone_encode;
+                next->end = &alone_encoder_end;
+                next->coder->next = LZMA_NEXT_CODER_INIT;
+        }
+
+        // Basic initializations
+        next->coder->sequence = SEQ_HEADER;
+        next->coder->header_pos = 0;
+
+        // Encode the header:
+        // - Properties (1 byte)
+        if (lzma_lzma_lclppb_encode(options, next->coder->header))
+                return LZMA_OPTIONS_ERROR;
+
+        // - Dictionary size (4 bytes)
+        if (options->dict_size < LZMA_DICT_SIZE_MIN)
+                return LZMA_OPTIONS_ERROR;
+
+        // Round up to to the next 2^n or 2^n + 2^(n - 1) depending on which
+        // one is the next unless it is UINT32_MAX. While the header would
+        // allow any 32-bit integer, we do this to keep the decoder of liblzma
+        // accepting the resulting files.
+        uint32_t d = options->dict_size - 1;
+        d |= d >> 2;
+        d |= d >> 3;
+        d |= d >> 4;
+        d |= d >> 8;
+        d |= d >> 16;
+        if (d != UINT32_MAX)
+                ++d;
+
+        unaligned_write32le(next->coder->header + 1, d);
+
+        // - Uncompressed size (always unknown and using EOPM)
+        memset(next->coder->header + 1 + 4, 0xFF, 8);
+
+        // Initialize the LZMA encoder.
+        const lzma_filter_info filters[2] = {
+                {
+                        .init = &lzma_lzma_encoder_init,
+                        .options = (void *)(options),
+                }, {
+                        .init = NULL,
+                }
+        };
+
+        return lzma_next_filter_init(&next->coder->next, allocator, filters);
+}
+
+
+/*
+extern lzma_ret
+lzma_alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+                const lzma_options_alone *options)
+{
+        lzma_next_coder_init(&alone_encoder_init, next, allocator, options);
+}
+*/
+
+
+extern LZMA_API(lzma_ret)
+lzma_alone_encoder(lzma_stream *strm, const lzma_options_lzma *options)
+{
+        lzma_next_strm_init(alone_encoder_init, strm, options);
+
+        strm->internal->supported_actions[LZMA_RUN] = true;
+        strm->internal->supported_actions[LZMA_FINISH] = true;
+
+        return LZMA_OK;
+}