68b2e7f763
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82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
#include <stdio.h>
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#include <assert.h>
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#include "zbuild.h"
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#ifdef ZLIB_COMPAT
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# include "zlib.h"
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#else
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# include "zlib-ng.h"
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#endif
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataLen) {
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uint32_t crc0 = PREFIX(crc32)(0L, NULL, 0);
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uint32_t crc1 = crc0;
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uint32_t crc2 = crc0;
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uint32_t adler0 = PREFIX(adler32)(0L, NULL, 0);
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uint32_t adler1 = adler0;
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uint32_t adler2 = adler0;
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uint32_t combine1, combine2;
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/* Checksum with a buffer of size equal to the first byte in the input. */
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uint32_t buffSize = data[0];
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uint32_t offset = 0;
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uint32_t op;
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/* Discard inputs larger than 1Mb. */
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static size_t kMaxSize = 1024 * 1024;
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if (dataLen < 1 || dataLen > kMaxSize)
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return 0;
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/* Make sure the buffer has at least a byte. */
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if (buffSize == 0)
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++buffSize;
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/* CRC32 */
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op = PREFIX(crc32_combine_gen)(buffSize);
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for (offset = 0; offset + buffSize <= dataLen; offset += buffSize) {
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uint32_t crc3 = PREFIX(crc32_z)(crc0, data + offset, buffSize);
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uint32_t crc4 = PREFIX(crc32_combine_op)(crc1, crc3, op);
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crc1 = PREFIX(crc32_z)(crc1, data + offset, buffSize);
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assert(crc1 == crc4);
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Z_UNUSED(crc1);
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Z_UNUSED(crc4);
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}
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crc1 = PREFIX(crc32_z)(crc1, data + offset, dataLen % buffSize);
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crc2 = PREFIX(crc32_z)(crc2, data, dataLen);
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assert(crc1 == crc2);
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Z_UNUSED(crc1);
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Z_UNUSED(crc2);
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combine1 = PREFIX(crc32_combine)(crc1, crc2, (z_off_t)dataLen);
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combine2 = PREFIX(crc32_combine)(crc1, crc1, (z_off_t)dataLen);
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assert(combine1 == combine2);
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/* Fast CRC32 combine. */
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op = PREFIX(crc32_combine_gen)((z_off_t)dataLen);
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combine1 = PREFIX(crc32_combine_op)(crc1, crc2, op);
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combine2 = PREFIX(crc32_combine_op)(crc2, crc1, op);
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assert(combine1 == combine2);
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combine1 = PREFIX(crc32_combine)(crc1, crc2, (z_off_t)dataLen);
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combine2 = PREFIX(crc32_combine_op)(crc2, crc1, op);
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assert(combine1 == combine2);
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/* Adler32 */
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for (offset = 0; offset + buffSize <= dataLen; offset += buffSize)
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adler1 = PREFIX(adler32_z)(adler1, data + offset, buffSize);
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adler1 = PREFIX(adler32_z)(adler1, data + offset, dataLen % buffSize);
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adler2 = PREFIX(adler32_z)(adler2, data, dataLen);
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assert(adler1 == adler2);
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Z_UNUSED(adler1);
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Z_UNUSED(adler2);
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combine1 = PREFIX(adler32_combine)(adler1, adler2, (z_off_t)dataLen);
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combine2 = PREFIX(adler32_combine)(adler1, adler1, (z_off_t)dataLen);
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assert(combine1 == combine2);
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Z_UNUSED(combine1);
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Z_UNUSED(combine2);
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/* This function must return 0. */
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return 0;
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}
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