68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
#include <stdio.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include "zlib.h"
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataLen) {
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uint32_t crc0 = 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 = adler32(0L, NULL, 0);
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uint32_t adler1 = adler0;
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uint32_t adler2 = adler0;
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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 = crc32_combine_gen(buffSize);
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for (offset = 0; offset + buffSize <= dataLen; offset += buffSize) {
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uint32_t crc3 = crc32_z(crc0, data + offset, buffSize);
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uint32_t crc4 = crc32_combine_op(crc1, crc3, op);
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crc1 = crc32_z(crc1, data + offset, buffSize);
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assert(crc1 == crc4);
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}
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crc1 = crc32_z(crc1, data + offset, dataLen % buffSize);
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crc2 = crc32(crc2, data, (uint32_t) dataLen);
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assert(crc1 == crc2);
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assert(crc32_combine(crc1, crc2, dataLen) ==
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crc32_combine(crc1, crc1, dataLen));
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/* Fast CRC32 combine. */
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op = crc32_combine_gen(dataLen);
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assert(crc32_combine_op(crc1, crc2, op) ==
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crc32_combine_op(crc2, crc1, op));
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assert(crc32_combine(crc1, crc2, dataLen) ==
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crc32_combine_op(crc2, crc1, op));
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/* Adler32 */
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for (offset = 0; offset + buffSize <= dataLen; offset += buffSize)
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adler1 = adler32_z(adler1, data + offset, buffSize);
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adler1 = adler32_z(adler1, data + offset, dataLen % buffSize);
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adler2 = adler32(adler2, data, (uint32_t) dataLen);
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assert(adler1 == adler2);
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assert(adler32_combine(adler1, adler2, dataLen) ==
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adler32_combine(adler1, adler1, dataLen));
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/* This function must return 0. */
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return 0;
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}
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