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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 16
#define MAX_ALLOCATION (1024 * 1024 * 1024)
static uint64_t total = 0;
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 > MAX_ALLOCATION - ALIGNMENT - total)
return NULL;
ptr = (char *) malloc(size + ALIGNMENT);
if (ptr == NULL)
return NULL;
memcpy(ptr, &size, sizeof(size));
total += size + ALIGNMENT;
return ptr + ALIGNMENT;
}
static void
fz_free_ossfuzz(void *opaque, void *ptr)
{
size_t size;
if (ptr == NULL)
return;
ptr = ((char *) ptr) - ALIGNMENT;
memcpy(&size, ptr, sizeof(size));
total -= 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 (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 > MAX_ALLOCATION - total + oldsize)
return NULL;
ptr = (char *) realloc(old, size + ALIGNMENT);
if (ptr == NULL)
return NULL;
total -= oldsize + ALIGNMENT;
memcpy(ptr, &size, sizeof(size));
total += 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_new_context(&fz_alloc_ossfuzz, nullptr, FZ_STORE_DEFAULT);
fz_stream *stream = NULL;
fz_document *doc = NULL;
fz_pixmap *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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