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// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/fx_string.h"
#include <limits>
#include <vector>
#include "core/fxcrt/cfx_utf8decoder.h"
#include "core/fxcrt/cfx_utf8encoder.h"
#include "core/fxcrt/fx_extension.h"
#include "third_party/base/compiler_specific.h"
ByteString FX_UTF8Encode(WideStringView wsStr) {
CFX_UTF8Encoder encoder;
for (size_t i = 0; i < wsStr.GetLength(); ++i)
encoder.Input(wsStr[i]);
return ByteString(encoder.GetResult());
}
WideString FX_UTF8Decode(ByteStringView bsStr) {
if (bsStr.IsEmpty())
return WideString();
CFX_UTF8Decoder decoder;
for (size_t i = 0; i < bsStr.GetLength(); i++)
decoder.Input(bsStr[i]);
return WideString(decoder.GetResult());
}
namespace {
constexpr float kFractionScalesFloat[] = {
0.1f, 0.01f, 0.001f, 0.0001f,
0.00001f, 0.000001f, 0.0000001f, 0.00000001f,
0.000000001f, 0.0000000001f, 0.00000000001f};
const double kFractionScalesDouble[] = {
0.1, 0.01, 0.001, 0.0001, 0.00001, 0.000001,
0.0000001, 0.00000001, 0.000000001, 0.0000000001, 0.00000000001};
template <class T>
T StringTo(ByteStringView strc,
const T fractional_scales[],
size_t fractional_scales_size) {
if (strc.IsEmpty())
return 0;
int cc = 0;
bool bNegative = false;
int len = strc.GetLength();
if (strc[0] == '+') {
cc++;
} else if (strc[0] == '-') {
bNegative = true;
cc++;
}
while (cc < len) {
if (strc[cc] != '+' && strc[cc] != '-')
break;
cc++;
}
T value = 0;
while (cc < len) {
if (strc[cc] == '.')
break;
value = value * 10 + FXSYS_DecimalCharToInt(strc.CharAt(cc));
cc++;
}
size_t scale = 0;
if (cc < len && strc[cc] == '.') {
cc++;
while (cc < len) {
value +=
fractional_scales[scale] * FXSYS_DecimalCharToInt(strc.CharAt(cc));
scale++;
if (scale == fractional_scales_size)
break;
cc++;
}
}
return bNegative ? -value : value;
}
template <class T>
size_t ToString(T value, int (*round_func)(T), char* buf) {
buf[0] = '0';
buf[1] = '\0';
if (value == 0) {
return 1;
}
bool bNegative = false;
if (value < 0) {
bNegative = true;
value = -value;
}
int scale = 1;
int scaled = round_func(value);
while (scaled < 100000) {
if (scale == 1000000) {
break;
}
scale *= 10;
scaled = round_func(value * scale);
}
if (scaled == 0) {
return 1;
}
char buf2[32];
size_t buf_size = 0;
if (bNegative) {
buf[buf_size++] = '-';
}
int i = scaled / scale;
FXSYS_itoa(i, buf2, 10);
size_t len = strlen(buf2);
memcpy(buf + buf_size, buf2, len);
buf_size += len;
int fraction = scaled % scale;
if (fraction == 0) {
return buf_size;
}
buf[buf_size++] = '.';
scale /= 10;
while (fraction) {
buf[buf_size++] = '0' + fraction / scale;
fraction %= scale;
scale /= 10;
}
return buf_size;
}
} // namespace
float StringToFloat(ByteStringView strc) {
return StringTo<float>(strc, kFractionScalesFloat,
FX_ArraySize(kFractionScalesFloat));
}
float StringToFloat(WideStringView wsStr) {
return StringToFloat(FX_UTF8Encode(wsStr).c_str());
}
size_t FloatToString(float f, char* buf) {
return ToString<float>(f, FXSYS_roundf, buf);
}
double StringToDouble(ByteStringView strc) {
return StringTo<double>(strc, kFractionScalesDouble,
FX_ArraySize(kFractionScalesDouble));
}
double StringToDouble(WideStringView wsStr) {
return StringToDouble(FX_UTF8Encode(wsStr).c_str());
}
size_t DoubleToString(double d, char* buf) {
return ToString<double>(d, FXSYS_round, buf);
}
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