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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/cbor/diagnostic_writer.h"
#include <string>
#include "base/json/string_escape.h"
#include "base/notreached.h"
#include "base/numerics/clamped_math.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "components/cbor/constants.h"
#include "components/cbor/values.h"
using base::ClampAdd;
using base::ClampMul;
namespace cbor {
static bool AppendHex(const std::vector<uint8_t> bytes,
char type_char,
size_t rough_max_output_bytes,
std::string* s) {
if (s->size() > rough_max_output_bytes) {
return false;
}
const size_t hex_size = ClampMul(2u, bytes.size());
// If the hex string would be longer than 87.5% of the total output space, or
// if it would cause the current string to be too long, replace it with an
// indication of its length. (87.5% was chosen because it's easy to
// calculate and is reasonable.)
if (hex_size > rough_max_output_bytes - (rough_max_output_bytes >> 3) ||
ClampAdd(s->size(), hex_size) >= rough_max_output_bytes) {
s->append(base::StringPrintf("(%zu bytes)", bytes.size()));
} else {
s->push_back(type_char);
s->push_back('\'');
s->append(base::HexEncode(bytes));
s->push_back('\'');
}
return s->size() < rough_max_output_bytes;
}
static bool Serialize(const Value& node,
size_t rough_max_output_bytes,
std::string* s) {
switch (node.type()) {
case Value::Type::UNSIGNED:
s->append(base::NumberToString(node.GetUnsigned()));
break;
case Value::Type::NEGATIVE:
s->append(base::NumberToString(node.GetNegative()));
break;
case Value::Type::INVALID_UTF8:
if (!AppendHex(node.GetInvalidUTF8(), 's', rough_max_output_bytes, s)) {
return false;
}
break;
case Value::Type::BYTE_STRING:
if (!AppendHex(node.GetBytestring(), 'h', rough_max_output_bytes, s)) {
return false;
}
break;
case Value::Type::STRING: {
std::string quoted_and_escaped;
base::EscapeJSONString(node.GetString(), /*put_in_quotes=*/true,
"ed_and_escaped);
if (ClampAdd(s->size(), quoted_and_escaped.size()) >
rough_max_output_bytes) {
return false;
}
s->append(quoted_and_escaped);
break;
}
case Value::Type::ARRAY: {
s->push_back('[');
const Value::ArrayValue& nodes = node.GetArray();
bool first = true;
for (const auto& subnode : nodes) {
if (!first) {
s->append(", ");
}
if (!Serialize(subnode, rough_max_output_bytes, s) ||
s->size() > rough_max_output_bytes) {
return false;
}
first = false;
}
s->push_back(']');
break;
}
case Value::Type::MAP: {
s->push_back('{');
const Value::MapValue& nodes = node.GetMap();
bool first = true;
for (const auto& pair : nodes) {
if (!first) {
s->append(", ");
}
if (!Serialize(pair.first, rough_max_output_bytes, s)) {
return false;
}
s->append(": ");
if (!Serialize(pair.second, rough_max_output_bytes, s) ||
s->size() > rough_max_output_bytes) {
return false;
}
first = false;
}
s->push_back('}');
break;
}
case Value::Type::SIMPLE_VALUE:
switch (node.GetSimpleValue()) {
case Value::SimpleValue::FALSE_VALUE:
s->append("false");
break;
case Value::SimpleValue::TRUE_VALUE:
s->append("true");
break;
case Value::SimpleValue::NULL_VALUE:
s->append("null");
break;
case Value::SimpleValue::UNDEFINED:
s->append("undefined");
break;
default:
NOTREACHED();
}
break;
case Value::Type::FLOAT_VALUE:
s->append(base::NumberToString(node.GetDouble()));
break;
case Value::Type::NONE:
s->append("none");
break;
case Value::Type::TAG:
NOTREACHED();
}
return true;
}
// static
std::string DiagnosticWriter::Write(const Value& node,
size_t rough_max_output_bytes) {
std::string ret;
Serialize(node, rough_max_output_bytes, &ret);
return ret;
}
} // namespace cbor
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