82 lines
2.5 KiB
C
82 lines
2.5 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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static const uint8_t *data;
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static size_t dataLen;
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static void check_compress_level(uint8_t *compr, size_t comprLen,
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uint8_t *uncompr, size_t uncomprLen,
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int level) {
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compress2(compr, &comprLen, data, dataLen, level);
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uncompress(uncompr, &uncomprLen, compr, comprLen);
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/* Make sure compress + uncompress gives back the input data. */
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assert(dataLen == uncomprLen);
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assert(0 == memcmp(data, uncompr, dataLen));
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}
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#define put_byte(s, i, c) {s[i] = (unsigned char)(c);}
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static void write_zlib_header(uint8_t *s) {
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unsigned level_flags = 0; /* compression level (0..3) */
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unsigned w_bits = 8; /* window size log2(w_size) (8..16) */
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unsigned int header = (Z_DEFLATED + ((w_bits-8)<<4)) << 8;
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header |= (level_flags << 6);
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header += 31 - (header % 31);
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/* s is guaranteed to be longer than 2 bytes. */
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put_byte(s, 0, (unsigned char)(header >> 8));
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put_byte(s, 1, (unsigned char)(header & 0xff));
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}
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static void check_decompress(uint8_t *compr, size_t comprLen) {
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/* We need to write a valid zlib header of size two bytes. Copy the input data
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in a larger buffer. Do not modify the input data to avoid libFuzzer error:
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fuzz target overwrites its const input. */
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size_t copyLen = dataLen + 2;
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uint8_t *copy = (uint8_t *)malloc(copyLen);
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memcpy(copy + 2, data, dataLen);
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write_zlib_header(copy);
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uncompress(compr, &comprLen, copy, copyLen);
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free(copy);
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}
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int LLVMFuzzerTestOneInput(const uint8_t *d, size_t size) {
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/* compressBound does not provide enough space for low compression levels. */
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size_t comprLen = 100 + 2 * compressBound(size);
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size_t uncomprLen = size;
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uint8_t *compr, *uncompr;
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/* Discard inputs larger than 1Mb. */
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static size_t kMaxSize = 1024 * 1024;
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if (size < 1 || size > kMaxSize)
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return 0;
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data = d;
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dataLen = size;
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compr = (uint8_t *)calloc(1, comprLen);
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uncompr = (uint8_t *)calloc(1, uncomprLen);
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check_compress_level(compr, comprLen, uncompr, uncomprLen, 1);
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check_compress_level(compr, comprLen, uncompr, uncomprLen, 3);
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check_compress_level(compr, comprLen, uncompr, uncomprLen, 6);
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check_compress_level(compr, comprLen, uncompr, uncomprLen, 7);
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check_decompress(compr, comprLen);
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free(compr);
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free(uncompr);
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/* This function must return 0. */
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return 0;
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}
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