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/*
# Copyright 2019 The Chromium OS Authors.
#
# 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 <base/gserrors.h>
#include <psi/iapi.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
static const unsigned char *g_data;
static size_t g_size;
int fuzz_gs_device(
const unsigned char *buf,
size_t size,
int color_scheme,
const char *device_target
);
#define min(x, y) ((x) < (y) ? (x) : (y))
static int gs_stdin(void *inst, char *buf, int len)
{
size_t to_copy = min(len, g_size);
to_copy = min(INT_MAX, to_copy);
memcpy(buf, g_data, to_copy);
g_data += to_copy;
g_size -= to_copy;
return to_copy;
}
static int gs_stdnull(void *inst, const char *buf, int len)
{
/* Just discard everything. */
return len;
}
int gs_to_raster_fuzz(
const unsigned char *buf,
size_t size,
int color_scheme
)
{
return fuzz_gs_device(buf, size, color_scheme, "cups");
}
int fuzz_gs_device(
const unsigned char *buf,
size_t size,
int color_scheme,
const char *device_target
)
{
int ret;
void *gs = NULL;
char color_space[50];
char gs_device[50];
/*
* We are expecting color_scheme to be in the [0:62] interval.
* This corresponds to the color schemes defined here:
* https://github.com/ArtifexSoftware/ghostpdl/blob/8c97d5adce0040ac38a1fb4d7954499c65f582ff/cups/libs/cups/raster.h#L102
*/
sprintf(color_space, "-dcupsColorSpace=%d", color_scheme);
sprintf(gs_device, "-sDEVICE=%s", device_target);
/* Mostly stolen from cups-filters gstoraster. */
char *args[] = {
"gs",
"-K1048576",
"-r200x200",
"-sBandListStorage=memory",
"-dMaxBitmap=0",
"-dBufferSpace=450k",
"-dMediaPosition=1",
color_space,
"-dQUIET",
"-dSAFER",
"-dNOPAUSE",
"-dBATCH",
"-dNOINTERPOLATE",
"-dNOMEDIAATTRS",
"-sstdout=%%stderr",
"-sOutputFile=/dev/null",
gs_device,
"-_",
};
int argc = sizeof(args) / sizeof(args[0]);
/* Stash buffers globally, for gs_stdin(). */
g_data = buf;
g_size = size;
ret = gsapi_new_instance(&gs, NULL);
if (ret < 0) {
fprintf(stderr, "gsapi_new_instance: error %d\n", ret);
return ret;
}
gsapi_set_stdio(gs, gs_stdin, gs_stdnull, gs_stdnull);
ret = gsapi_set_arg_encoding(gs, GS_ARG_ENCODING_UTF8);
if (ret < 0) {
fprintf(stderr, "gsapi_set_arg_encoding: error %d\n", ret);
gsapi_delete_instance(gs);
return ret;
}
ret = gsapi_init_with_args(gs, argc, args);
if (ret && ret != gs_error_Quit)
/* Just keep going, to cleanup. */
fprintf(stderr, "gsapi_init_with_args: error %d\n", ret);
ret = gsapi_exit(gs);
if (ret < 0 && ret != gs_error_Quit) {
fprintf(stderr, "gsapi_exit: error %d\n", ret);
return ret;
}
gsapi_delete_instance(gs);
return 0;
}
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