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Unified Diff: xz/src/liblzma/common/alone_encoder.c

Issue 2869016: Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/
Patch Set: Created 10 years, 6 months ago
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Index: xz/src/liblzma/common/alone_encoder.c
===================================================================
--- xz/src/liblzma/common/alone_encoder.c (revision 0)
+++ xz/src/liblzma/common/alone_encoder.c (revision 0)
@@ -0,0 +1,157 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \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;
+}
Property changes on: xz/src/liblzma/common/alone_encoder.c
___________________________________________________________________
Added: svn:eol-style
+ LF
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