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Unified Diff: xz/src/liblzma/delta/delta_common.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/delta/delta_common.c
===================================================================
--- xz/src/liblzma/delta/delta_common.c (revision 0)
+++ xz/src/liblzma/delta/delta_common.c (revision 0)
@@ -0,0 +1,70 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file delta_common.c
+/// \brief Common stuff for Delta encoder and decoder
+//
+// Author: Lasse Collin
+//
+// This file has been put into the public domain.
+// You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "delta_common.h"
+#include "delta_private.h"
+
+
+static void
+delta_coder_end(lzma_coder *coder, lzma_allocator *allocator)
+{
+ lzma_next_end(&coder->next, allocator);
+ lzma_free(coder, allocator);
+ return;
+}
+
+
+extern lzma_ret
+lzma_delta_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
+ const lzma_filter_info *filters)
+{
+ // Allocate memory for the decoder if needed.
+ if (next->coder == NULL) {
+ next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
+ if (next->coder == NULL)
+ return LZMA_MEM_ERROR;
+
+ // End function is the same for encoder and decoder.
+ next->end = &delta_coder_end;
+ next->coder->next = LZMA_NEXT_CODER_INIT;
+ }
+
+ // Validate the options.
+ if (lzma_delta_coder_memusage(filters[0].options) == UINT64_MAX)
+ return LZMA_OPTIONS_ERROR;
+
+ // Set the delta distance.
+ const lzma_options_delta *opt = filters[0].options;
+ next->coder->distance = opt->dist;
+
+ // Initialize the rest of the variables.
+ next->coder->pos = 0;
+ memzero(next->coder->history, LZMA_DELTA_DIST_MAX);
+
+ // Initialize the next decoder in the chain, if any.
+ return lzma_next_filter_init(&next->coder->next,
+ allocator, filters + 1);
+}
+
+
+extern uint64_t
+lzma_delta_coder_memusage(const void *options)
+{
+ const lzma_options_delta *opt = options;
+
+ if (opt == NULL || opt->type != LZMA_DELTA_TYPE_BYTE
+ || opt->dist < LZMA_DELTA_DIST_MIN
+ || opt->dist > LZMA_DELTA_DIST_MAX)
+ return UINT64_MAX;
+
+ return sizeof(lzma_coder);
+}
Property changes on: xz/src/liblzma/delta/delta_common.c
___________________________________________________________________
Added: svn:eol-style
+ LF
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