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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
// SPDX-License-Identifier: 0BSD
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file fuzz_common.h
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/// \brief Common macros and functions needed by the fuzz targets
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//
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// Authors: Maksym Vatsyk
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// Lasse Collin
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "lzma.h"
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// Some header values can make liblzma allocate a lot of RAM
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// (up to about 4 GiB with liblzma 5.2.x). We set a limit here to
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// prevent extreme allocations when fuzzing.
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#define MEM_LIMIT (300 << 20) // 300 MiB
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// Amount of input to pass to lzma_code() per call at most.
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#define IN_CHUNK_SIZE 2047
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static void
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fuzz_code(lzma_stream *stream, const uint8_t *inbuf, size_t inbuf_size)
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{
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// Output buffer for decompressed data. This is write only; nothing
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// cares about the actual data written here.
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uint8_t outbuf[4096];
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// Pass half of the input on the first call and then proceed in
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// chunks. It's fine that this rounds to 0 when inbuf_size is 1.
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stream->next_in = inbuf;
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stream->avail_in = inbuf_size / 2;
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stream->next_out = NULL;
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stream->avail_out = 0;
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lzma_action action = LZMA_RUN;
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lzma_ret ret;
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do {
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if (stream->avail_in == 0 && inbuf_size > 0) {
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const size_t chunk_size = inbuf_size < IN_CHUNK_SIZE
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? inbuf_size : IN_CHUNK_SIZE;
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stream->next_in = inbuf;
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stream->avail_in = chunk_size;
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inbuf += chunk_size;
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inbuf_size -= chunk_size;
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if (inbuf_size == 0)
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action = LZMA_FINISH;
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}
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if (stream->avail_out == 0) {
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// outbuf became full. We don't care about the
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// uncompressed data there, so we simply reuse
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// the outbuf and overwrite the old data.
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stream->next_out = outbuf;
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stream->avail_out = sizeof(outbuf);
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}
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} while ((ret = lzma_code(stream, action)) == LZMA_OK);
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// LZMA_PROG_ERROR should never happen as long as the code calling
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// the liblzma functions is correct. Thus LZMA_PROG_ERROR is a sign
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// of a bug in either this function or in liblzma.
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if (ret == LZMA_PROG_ERROR) {
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fprintf(stderr, "lzma_code() returned LZMA_PROG_ERROR\n");
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abort();
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}
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}
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