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80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file fuzz_encode_stream.c
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/// \brief Fuzz test program for liblzma lzma_stream_encoder() w/ LZMA2
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//
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// Author: Maksym Vatsyk
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//
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// Based on Lasse Collin's original fuzzer for liblzma
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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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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#include "fuzz_common.h"
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extern int
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LLVMFuzzerTestOneInput(const uint8_t *inbuf, size_t inbuf_size)
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{
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if (inbuf_size == 0) {
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fprintf(stderr, "no input data provided\n");
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return 0;
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}
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// set LZMA preset level based on the first input byte
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uint32_t preset_level;
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uint8_t decider = inbuf[0];
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switch (decider) {
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case 0:
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case 1:
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case 5:
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preset_level = (uint32_t)decider;
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break;
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case 6:
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preset_level = 0 | LZMA_PRESET_EXTREME;
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break;
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case 7:
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preset_level = 3 | LZMA_PRESET_EXTREME;
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break;
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default:
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return 0;
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}
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// Initialize lzma_options with the above preset level
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lzma_options_lzma opt_lzma;
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if (lzma_lzma_preset(&opt_lzma, preset_level)){
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fprintf(stderr, "lzma_lzma_preset() failed\n");
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abort();
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}
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// Initialize filter chain for lzma_stream_decoder() call
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// Use single LZMA2 filter for encoding
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lzma_filter filters[2];
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filters[0].id = LZMA_FILTER_LZMA2;
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filters[0].options = &opt_lzma;
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filters[1].id = LZMA_VLI_UNKNOWN;
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// initialize empty LZMA stream
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lzma_stream strm = LZMA_STREAM_INIT;
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// Initialize the stream encoder using the above
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// stream, filter chain and CRC64.
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if (lzma_stream_encoder(&strm,
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filters, LZMA_CHECK_CRC64) != LZMA_OK) {
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fprintf(stderr, "lzma_stream_encoder() failed\n");
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abort();
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}
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fuzz_code(&strm, inbuf + 1, inbuf_size - 1);
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// Free the allocated memory.
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lzma_end(&strm);
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return 0;
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}
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