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FuzzCommon.cpp
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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "fuzz/Fuzz.h"
#include "fuzz/FuzzCommon.h"
#include "src/core/SkPathPriv.h"
// We don't always want to test NaNs and infinities.
static void fuzz_nice_float(Fuzz* fuzz, float* f) {
float v;
fuzz->next(&v);
constexpr float kLimit = 1.0e35f; // FLT_MAX?
*f = (v == v && v <= kLimit && v >= -kLimit) ? v : 0.0f;
}
template <typename... Args>
static void fuzz_nice_float(Fuzz* fuzz, float* f, Args... rest) {
fuzz_nice_float(fuzz, f);
fuzz_nice_float(fuzz, rest...);
}
static void fuzz_nice_rect(Fuzz* fuzz, SkRect* r) {
fuzz_nice_float(fuzz, &r->fLeft, &r->fTop, &r->fRight, &r->fBottom);
r->sort();
}
// allows some float values for path points
void FuzzNicePath(Fuzz* fuzz, SkPath* path, int maxOps) {
if (maxOps <= 0 || fuzz->exhausted() || path->countPoints() > 100000) {
return;
}
uint8_t fillType;
fuzz->nextRange(&fillType, 0, (uint8_t)SkPathFillType::kInverseEvenOdd);
path->setFillType((SkPathFillType)fillType);
uint8_t numOps;
fuzz->nextRange(&numOps, 0, maxOps);
for (uint8_t i = 0; i < numOps; ++i) {
// When we start adding the path to itself, the fuzzer can make an
// exponentially long path, which causes timeouts.
if (path->countPoints() > 100000) {
return;
}
// How many items in the switch statement below.
constexpr uint8_t MAX_PATH_OPERATION = 32;
uint8_t op;
fuzz->nextRange(&op, 0, MAX_PATH_OPERATION);
bool test;
SkPath p;
SkMatrix m;
SkRRect rr;
SkRect r;
SkPathDirection dir;
unsigned int ui;
SkScalar a, b, c, d, e, f;
switch (op) {
case 0:
fuzz_nice_float(fuzz, &a, &b);
path->moveTo(a, b);
break;
case 1:
fuzz_nice_float(fuzz, &a, &b);
path->rMoveTo(a, b);
break;
case 2:
fuzz_nice_float(fuzz, &a, &b);
path->lineTo(a, b);
break;
case 3:
fuzz_nice_float(fuzz, &a, &b);
path->rLineTo(a, b);
break;
case 4:
fuzz_nice_float(fuzz, &a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case 5:
fuzz_nice_float(fuzz, &a, &b, &c, &d);
path->rQuadTo(a, b, c, d);
break;
case 6:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case 7:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->rConicTo(a, b, c, d, e);
break;
case 8:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e, &f);
path->cubicTo(a, b, c, d, e, f);
break;
case 9:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e, &f);
path->rCubicTo(a, b, c, d, e, f);
break;
case 10:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->arcTo(a, b, c, d, e);
break;
case 11:
fuzz_nice_float(fuzz, &a, &b);
fuzz_nice_rect(fuzz, &r);
fuzz->next(&test);
path->arcTo(r, a, b, test);
break;
case 12:
path->close();
break;
case 13:
fuzz_nice_rect(fuzz, &r);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
path->addRect(r, dir);
break;
case 14:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_rect(fuzz, &r);
fuzz->next(&ui);
path->addRect(r, dir, ui);
break;
case 15:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_rect(fuzz, &r);
path->addOval(r, dir);
break;
case 16:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_rect(fuzz, &r);
fuzz->next(&ui);
path->addOval(r, dir, ui);
break;
case 17:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_float(fuzz, &a, &b, &c);
path->addCircle(a, b, c, dir);
break;
case 18:
fuzz_nice_rect(fuzz, &r);
fuzz_nice_float(fuzz, &a, &b);
path->addArc(r, a, b);
break;
case 19:
fuzz_nice_float(fuzz, &a, &b);
fuzz_nice_rect(fuzz, &r);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
path->addRoundRect(r, a, b, dir);
break;
case 20:
FuzzNiceRRect(fuzz, &rr);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
path->addRRect(rr, dir);
break;
case 21:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
FuzzNiceRRect(fuzz, &rr);
path->addRRect(rr, dir, ui);
break;
case 22: {
fuzz->nextRange(&ui, 0, 1);
SkPath::AddPathMode mode = static_cast<SkPath::AddPathMode>(ui);
FuzzNiceMatrix(fuzz, &m);
FuzzNicePath(fuzz, &p, maxOps-1);
path->addPath(p, m, mode);
break;
}
case 23: {
fuzz->nextRange(&ui, 0, 1);
SkPath::AddPathMode mode = static_cast<SkPath::AddPathMode>(ui);
FuzzNiceMatrix(fuzz, &m);
path->addPath(*path, m, mode);
break;
}
case 24:
FuzzNicePath(fuzz, &p, maxOps-1);
path->reverseAddPath(p);
break;
case 25:
path->addPath(*path);
break;
case 26:
path->reverseAddPath(*path);
break;
case 27:
fuzz_nice_float(fuzz, &a, &b);
path->offset(a, b, path);
break;
case 28:
FuzzNicePath(fuzz, &p, maxOps-1);
fuzz_nice_float(fuzz, &a, &b);
p.offset(a, b, path);
break;
case 29:
FuzzNiceMatrix(fuzz, &m);
path->transform(m, path);
break;
case 30:
FuzzNicePath(fuzz, &p, maxOps-1);
// transform can explode path sizes so skip this op if p too big
if (p.countPoints() <= 100000) {
FuzzNiceMatrix(fuzz, &m);
p.transform(m, path);
}
break;
case 31:
fuzz_nice_float(fuzz, &a, &b);
path->setLastPt(a, b);
break;
case MAX_PATH_OPERATION:
SkPathPriv::ShrinkToFit(path);
break;
default:
SkASSERT(false);
break;
}
SkASSERTF( path->isValid(), "path->isValid() failed at op %d, case %d", i, op);
}
}
// allows all float values for path points
void FuzzEvilPath(Fuzz* fuzz, SkPath* path, int last_verb) {
while (!fuzz->exhausted()) {
// Use a uint8_t to conserve bytes. This makes our "fuzzed bytes footprint"
// smaller, which leads to more efficient fuzzing.
uint8_t operation;
fuzz->next(&operation);
SkScalar a,b,c,d,e,f;
switch (operation % (last_verb + 1)) {
case SkPath::Verb::kMove_Verb:
fuzz->next(&a, &b);
path->moveTo(a, b);
break;
case SkPath::Verb::kLine_Verb:
fuzz->next(&a, &b);
path->lineTo(a, b);
break;
case SkPath::Verb::kQuad_Verb:
fuzz->next(&a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case SkPath::Verb::kConic_Verb:
fuzz->next(&a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case SkPath::Verb::kCubic_Verb:
fuzz->next(&a, &b, &c, &d, &e, &f);
path->cubicTo(a, b, c, d, e, f);
break;
case SkPath::Verb::kClose_Verb:
path->close();
break;
case SkPath::Verb::kDone_Verb:
// In this case, simply exit.
return;
}
}
}
void FuzzNiceRRect(Fuzz* fuzz, SkRRect* rr) {
SkRect r;
fuzz_nice_rect(fuzz, &r);
SkVector radii[4];
for (SkVector& vec : radii) {
fuzz->nextRange(&vec.fX, 0.0f, 1.0f);
vec.fX *= 0.5f * r.width();
fuzz->nextRange(&vec.fY, 0.0f, 1.0f);
vec.fY *= 0.5f * r.height();
}
rr->setRectRadii(r, radii);
SkASSERT(rr->isValid());
}
void FuzzNiceMatrix(Fuzz* fuzz, SkMatrix* m) {
constexpr int kArrayLength = 9;
SkScalar buffer[kArrayLength];
int matrixType;
fuzz->nextRange(&matrixType, 0, 4);
switch (matrixType) {
case 0: // identity
*m = SkMatrix::I();
return;
case 1: // translate
fuzz->nextRange(&buffer[0], -4000.0f, 4000.0f);
fuzz->nextRange(&buffer[1], -4000.0f, 4000.0f);
*m = SkMatrix::Translate(buffer[0], buffer[1]);
return;
case 2: // translate + scale
fuzz->nextRange(&buffer[0], -400.0f, 400.0f);
fuzz->nextRange(&buffer[1], -400.0f, 400.0f);
fuzz->nextRange(&buffer[2], -4000.0f, 4000.0f);
fuzz->nextRange(&buffer[3], -4000.0f, 4000.0f);
*m = SkMatrix::Scale(buffer[0], buffer[1]);
m->postTranslate(buffer[2], buffer[3]);
return;
case 3: // affine
fuzz->nextN(buffer, 6);
m->setAffine(buffer);
return;
case 4: // perspective
fuzz->nextN(buffer, kArrayLength);
m->set9(buffer);
return;
default:
SkASSERT(false);
return;
}
}
void FuzzNiceRegion(Fuzz* fuzz, SkRegion* region, int maxN) {
uint8_t N;
fuzz->nextRange(&N, 0, maxN);
for (uint8_t i = 0; i < N; ++i) {
SkIRect r;
SkRegion::Op op;
// Avoid the sentinel value used by Region.
fuzz->nextRange(&r.fLeft, -2147483646, 2147483646);
fuzz->nextRange(&r.fTop, -2147483646, 2147483646);
fuzz->nextRange(&r.fRight, -2147483646, 2147483646);
fuzz->nextRange(&r.fBottom, -2147483646, 2147483646);
r.sort();
fuzz->nextEnum(&op, SkRegion::kLastOp);
if (!region->op(r, op)) {
return;
}
}
}