integrate lzma

[zpackage] / lzma / common / filter_flags_decoder.c

diff --git a/lzma/common/filter_flags_decoder.c b/lzma/common/filter_flags_decoder.c
new file mode 100644 (file)
index 0000000..ddfb085
--- /dev/null
+++ b/lzma/common/filter_flags_decoder.c
@@ -0,0 +1,46 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       filter_flags_decoder.c
+/// \brief      Decodes a Filter Flags field
+//
+//  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"
+
+
+extern LZMA_API(lzma_ret)
+lzma_filter_flags_decode(
+               lzma_filter *filter, const lzma_allocator *allocator,
+               const uint8_t *in, size_t *in_pos, size_t in_size)
+{
+       // Set the pointer to NULL so the caller can always safely free it.
+       filter->options = NULL;
+
+       // Filter ID
+       return_if_error(lzma_vli_decode(&filter->id, NULL,
+                       in, in_pos, in_size));
+
+       if (filter->id >= LZMA_FILTER_RESERVED_START)
+               return LZMA_DATA_ERROR;
+
+       // Size of Properties
+       lzma_vli props_size;
+       return_if_error(lzma_vli_decode(&props_size, NULL,
+                       in, in_pos, in_size));
+
+       // Filter Properties
+       if (in_size - *in_pos < props_size)
+               return LZMA_DATA_ERROR;
+
+       const lzma_ret ret = lzma_properties_decode(
+                       filter, allocator, in + *in_pos, props_size);
+
+       *in_pos += props_size;
+
+       return ret;
+}