138 lines
3.7 KiB
C
138 lines
3.7 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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#define CHECK_ERR(err, msg) { \
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if (err != Z_OK) { \
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fprintf(stderr, "%s error: %d\n", msg, err); \
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exit(1); \
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} \
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}
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static const uint8_t *data;
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static size_t dataLen;
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static alloc_func zalloc = NULL;
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static free_func zfree = NULL;
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static unsigned int diff;
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/* ===========================================================================
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* Test deflate() with large buffers and dynamic change of compression level
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*/
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void test_large_deflate(unsigned char *compr, size_t comprLen,
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unsigned char *uncompr, size_t uncomprLen) {
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z_stream c_stream; /* compression stream */
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int err;
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c_stream.zalloc = zalloc;
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c_stream.zfree = zfree;
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c_stream.opaque = (void *)0;
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err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
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CHECK_ERR(err, "deflateInit");
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c_stream.next_out = compr;
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c_stream.avail_out = (unsigned int)comprLen;
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/* At this point, uncompr is still mostly zeroes, so it should compress
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* very well:
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*/
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c_stream.next_in = uncompr;
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c_stream.avail_in = (unsigned int)uncomprLen;
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err = deflate(&c_stream, Z_NO_FLUSH);
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CHECK_ERR(err, "deflate large 1");
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if (c_stream.avail_in != 0) {
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fprintf(stderr, "deflate not greedy\n");
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exit(1);
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}
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/* Feed in already compressed data and switch to no compression: */
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deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
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c_stream.next_in = compr;
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diff = (unsigned int)(c_stream.next_out - compr);
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c_stream.avail_in = diff;
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err = deflate(&c_stream, Z_NO_FLUSH);
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CHECK_ERR(err, "deflate large 2");
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/* Switch back to compressing mode: */
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deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
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c_stream.next_in = uncompr;
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c_stream.avail_in = (unsigned int)uncomprLen;
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err = deflate(&c_stream, Z_NO_FLUSH);
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CHECK_ERR(err, "deflate large 3");
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err = deflate(&c_stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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fprintf(stderr, "deflate large should report Z_STREAM_END\n");
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exit(1);
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}
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err = deflateEnd(&c_stream);
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CHECK_ERR(err, "deflateEnd");
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}
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/* ===========================================================================
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* Test inflate() with large buffers
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*/
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void test_large_inflate(unsigned char *compr, size_t comprLen,
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unsigned char *uncompr, size_t uncomprLen) {
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int err;
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z_stream d_stream; /* decompression stream */
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d_stream.zalloc = zalloc;
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d_stream.zfree = zfree;
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d_stream.opaque = (void *)0;
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d_stream.next_in = compr;
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d_stream.avail_in = (unsigned int)comprLen;
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err = inflateInit(&d_stream);
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CHECK_ERR(err, "inflateInit");
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for (;;) {
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d_stream.next_out = uncompr; /* discard the output */
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d_stream.avail_out = (unsigned int)uncomprLen;
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err = inflate(&d_stream, Z_NO_FLUSH);
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if (err == Z_STREAM_END)
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break;
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CHECK_ERR(err, "large inflate");
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}
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err = inflateEnd(&d_stream);
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CHECK_ERR(err, "inflateEnd");
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if (d_stream.total_out != 2 * uncomprLen + diff) {
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fprintf(stderr, "bad large inflate: %zu\n", d_stream.total_out);
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exit(1);
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}
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}
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int LLVMFuzzerTestOneInput(const uint8_t *d, size_t size) {
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size_t comprLen = 100 + 3 * size;
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size_t uncomprLen = comprLen;
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uint8_t *compr, *uncompr;
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/* Discard inputs larger than 512Kb. */
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static size_t kMaxSize = 512 * 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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test_large_deflate(compr, comprLen, uncompr, uncomprLen);
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test_large_inflate(compr, comprLen, uncompr, uncomprLen);
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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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