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Unified Diff: xz/src/liblzma/common/stream_buffer_decoder.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/stream_buffer_decoder.c
===================================================================
--- xz/src/liblzma/common/stream_buffer_decoder.c (revision 0)
+++ xz/src/liblzma/common/stream_buffer_decoder.c (revision 0)
@@ -0,0 +1,91 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file stream_buffer_decoder.c
+/// \brief Single-call .xz Stream decoder
+//
+// Author: Lasse Collin
+//
+// This file has been put into the public domain.
+// You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "stream_decoder.h"
+
+
+extern LZMA_API(lzma_ret)
+lzma_stream_buffer_decode(uint64_t *memlimit, uint32_t flags,
+ lzma_allocator *allocator,
+ const uint8_t *in, size_t *in_pos, size_t in_size,
+ uint8_t *out, size_t *out_pos, size_t out_size)
+{
+ // Sanity checks
+ if (in_pos == NULL || (in == NULL && *in_pos != in_size)
+ || *in_pos > in_size || out_pos == NULL
+ || (out == NULL && *out_pos != out_size)
+ || *out_pos > out_size)
+ return LZMA_PROG_ERROR;
+
+ // Catch flags that are not allowed in buffer-to-buffer decoding.
+ if (flags & LZMA_TELL_ANY_CHECK)
+ return LZMA_PROG_ERROR;
+
+ // Initialize the Stream decoder.
+ // TODO: We need something to tell the decoder that it can use the
+ // output buffer as workspace, and thus save significant amount of RAM.
+ lzma_next_coder stream_decoder = LZMA_NEXT_CODER_INIT;
+ lzma_ret ret = lzma_stream_decoder_init(
+ &stream_decoder, allocator, *memlimit, flags);
+
+ if (ret == LZMA_OK) {
+ // Save the positions so that we can restore them in case
+ // an error occurs.
+ const size_t in_start = *in_pos;
+ const size_t out_start = *out_pos;
+
+ // Do the actual decoding.
+ ret = stream_decoder.code(stream_decoder.coder, allocator,
+ in, in_pos, in_size, out, out_pos, out_size,
+ LZMA_FINISH);
+
+ if (ret == LZMA_STREAM_END) {
+ ret = LZMA_OK;
+ } else {
+ // Something went wrong, restore the positions.
+ *in_pos = in_start;
+ *out_pos = out_start;
+
+ if (ret == LZMA_OK) {
+ // Either the input was truncated or the
+ // output buffer was too small.
+ assert(*in_pos == in_size
+ || *out_pos == out_size);
+
+ // If all the input was consumed, then the
+ // input is truncated, even if the output
+ // buffer is also full. This is because
+ // processing the last byte of the Stream
+ // never produces output.
+ if (*in_pos == in_size)
+ ret = LZMA_DATA_ERROR;
+ else
+ ret = LZMA_BUF_ERROR;
+
+ } else if (ret == LZMA_MEMLIMIT_ERROR) {
+ // Let the caller know how much memory would
+ // have been needed.
+ uint64_t memusage;
+ (void)stream_decoder.memconfig(
+ stream_decoder.coder,
+ memlimit, &memusage, 0);
+ }
+ }
+ }
+
+ // Free the decoder memory. This needs to be done even if
+ // initialization fails, because the internal API doesn't
+ // require the initialization function to free its memory on error.
+ lzma_next_end(&stream_decoder, allocator);
+
+ return ret;
+}
Property changes on: xz/src/liblzma/common/stream_buffer_decoder.c
___________________________________________________________________
Added: svn:eol-style
+ LF
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