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145 lines
3.6 KiB
145 lines
3.6 KiB
/*
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# Copyright 2018 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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*/
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#include <cstdint>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "jbig2.h"
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#define ALIGNMENT ((size_t) 16)
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#define KBYTE ((size_t) 1024)
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#define MBYTE (1024 * KBYTE)
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#define GBYTE (1024 * MBYTE)
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#define MAX_ALLOCATION (1 * GBYTE)
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static size_t used;
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static void *jbig2_fuzzer_reached_limit(size_t oldsize, size_t size)
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{
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if (oldsize == 0)
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fprintf(stderr, "limit: %zu Mbyte used: %zu Mbyte allocation: %zu: limit reached\n", MAX_ALLOCATION / MBYTE, used / MBYTE, size);
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else
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fprintf(stderr, "limit: %zu Mbyte used: %zu Mbyte reallocation: %zu -> %zu: limit reached\n", MAX_ALLOCATION / MBYTE, used / MBYTE, oldsize, size);
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fflush(0);
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return NULL;
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}
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static void *jbig2_fuzzer_alloc(Jbig2Allocator *allocator, size_t size)
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{
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char *ptr = NULL;
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if (size == 0)
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return NULL;
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if (size > SIZE_MAX - ALIGNMENT)
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return NULL;
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if (size + ALIGNMENT > MAX_ALLOCATION - used)
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return jbig2_fuzzer_reached_limit(0, size + ALIGNMENT);
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ptr = (char *) malloc(size + ALIGNMENT);
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if (ptr == NULL)
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return NULL;
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memcpy(ptr, &size, sizeof(size));
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used += size + ALIGNMENT;
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return ptr + ALIGNMENT;
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}
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static void jbig2_fuzzer_free(Jbig2Allocator *allocator, void *ptr)
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{
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size_t size;
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if (ptr == NULL)
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return;
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if (ptr < (void *) ALIGNMENT)
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return;
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ptr = (char *) ptr - ALIGNMENT;
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memcpy(&size, ptr, sizeof(size));
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used -= size + ALIGNMENT;
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free(ptr);
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}
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static void *jbig2_fuzzer_realloc(Jbig2Allocator *allocator, void *old, size_t size)
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{
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size_t oldsize;
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char *ptr;
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if (old == NULL)
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return jbig2_fuzzer_alloc(allocator, size);
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if (old < (void *) ALIGNMENT)
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return NULL;
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if (size == 0) {
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jbig2_fuzzer_free(allocator, old);
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return NULL;
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}
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if (size > SIZE_MAX - ALIGNMENT)
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return NULL;
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old = (char *) old - ALIGNMENT;
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memcpy(&oldsize, old, sizeof(oldsize));
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if (size + ALIGNMENT > MAX_ALLOCATION - used + oldsize + ALIGNMENT)
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return jbig2_fuzzer_reached_limit(oldsize + ALIGNMENT, size + ALIGNMENT);
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ptr = (char *) realloc(old, size + ALIGNMENT);
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if (ptr == NULL)
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return NULL;
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used -= oldsize + ALIGNMENT;
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memcpy(ptr, &size, sizeof(size));
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used += size + ALIGNMENT;
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return ptr + ALIGNMENT;
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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Jbig2Allocator allocator;
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Jbig2Ctx *ctx = NULL;
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used = 0;
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allocator.alloc = jbig2_fuzzer_alloc;
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allocator.free = jbig2_fuzzer_free;
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allocator.realloc = jbig2_fuzzer_realloc;
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ctx = jbig2_ctx_new(&allocator, (Jbig2Options) 0, NULL, NULL, NULL);
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if (jbig2_data_in(ctx, data, size) == 0)
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{
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if (jbig2_complete_page(ctx) == 0)
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{
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Jbig2Image *image = jbig2_page_out(ctx);
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if (image != NULL)
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{
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int sum = 0;
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for (int i = 0; i < image->height * image->stride; i++)
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sum += image->data[i];
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printf("sum of image data bytes: %d\n", sum);
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}
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jbig2_release_page(ctx, image);
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}
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}
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jbig2_ctx_free(ctx);
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return 0;
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}
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