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/*
# Copyright 2018 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
################################################################################
*/
#include <cstdint>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <mupdf/fitz.h>
#define ALIGNMENT ((size_t) 16)
#define KBYTE ((size_t) 1024)
#define MBYTE (1024 * KBYTE)
#define GBYTE (1024 * MBYTE)
#define MAX_ALLOCATION (1 * GBYTE)
static size_t used;
static void *fz_limit_reached_ossfuzz(size_t oldsize, size_t size)
{
if (oldsize == 0)
fprintf(stderr, "limit: %zu Mbyte used: %zu Mbyte allocation: %zu: limit reached\n", MAX_ALLOCATION / MBYTE, used / MBYTE, size);
else
fprintf(stderr, "limit: %zu Mbyte used: %zu Mbyte reallocation: %zu -> %zu: limit reached\n", MAX_ALLOCATION / MBYTE, used / MBYTE, oldsize, size);
fflush(0);
return NULL;
}
static void *fz_malloc_ossfuzz(void *opaque, size_t size)
{
char *ptr = NULL;
if (size == 0)
return NULL;
if (size > SIZE_MAX - ALIGNMENT)
return NULL;
if (size + ALIGNMENT > MAX_ALLOCATION - used)
return fz_limit_reached_ossfuzz(0, size + ALIGNMENT);
ptr = (char *) malloc(size + ALIGNMENT);
if (ptr == NULL)
return NULL;
memcpy(ptr, &size, sizeof(size));
used += size + ALIGNMENT;
return ptr + ALIGNMENT;
}
static void fz_free_ossfuzz(void *opaque, void *ptr)
{
size_t size;
if (ptr == NULL)
return;
if (ptr < (void *) ALIGNMENT)
return;
ptr = (char *) ptr - ALIGNMENT;
memcpy(&size, ptr, sizeof(size));
used -= size + ALIGNMENT;
free(ptr);
}
static void *fz_realloc_ossfuzz(void *opaque, void *old, size_t size)
{
size_t oldsize;
char *ptr;
if (old == NULL)
return fz_malloc_ossfuzz(opaque, size);
if (old < (void *) ALIGNMENT)
return NULL;
if (size == 0) {
fz_free_ossfuzz(opaque, old);
return NULL;
}
if (size > SIZE_MAX - ALIGNMENT)
return NULL;
old = (char *) old - ALIGNMENT;
memcpy(&oldsize, old, sizeof(oldsize));
if (size + ALIGNMENT > MAX_ALLOCATION - used + oldsize + ALIGNMENT)
return fz_limit_reached_ossfuzz(oldsize + ALIGNMENT, size + ALIGNMENT);
ptr = (char *) realloc(old, size + ALIGNMENT);
if (ptr == NULL)
return NULL;
used -= oldsize + ALIGNMENT;
memcpy(ptr, &size, sizeof(size));
used += size + ALIGNMENT;
return ptr + ALIGNMENT;
}
static fz_alloc_context fz_alloc_ossfuzz =
{
NULL,
fz_malloc_ossfuzz,
fz_realloc_ossfuzz,
fz_free_ossfuzz
};
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
fz_context *ctx;
fz_stream *stream;
fz_document *doc;
fz_pixmap *pix;
used = 0;
ctx = fz_new_context(&fz_alloc_ossfuzz, nullptr, FZ_STORE_DEFAULT);
stream = NULL;
doc = NULL;
pix = NULL;
fz_var(stream);
fz_var(doc);
fz_var(pix);
fz_try(ctx) {
fz_register_document_handlers(ctx);
stream = fz_open_memory(ctx, data, size);
doc = fz_open_document_with_stream(ctx, "pdf", stream);
for (int i = 0; i < fz_count_pages(ctx, doc); i++) {
pix = fz_new_pixmap_from_page_number(ctx, doc, i, fz_identity, fz_device_rgb(ctx), 0);
fz_drop_pixmap(ctx, pix);
pix = NULL;
}
}
fz_always(ctx) {
fz_drop_pixmap(ctx, pix);
fz_drop_document(ctx, doc);
fz_drop_stream(ctx, stream);
}
fz_catch(ctx) {
}
fz_drop_context(ctx);
return 0;
}
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