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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 <limits>
#include <vector>
#include "core/fxcrt/cfx_utf8decoder.h"
#include "core/fxcrt/cfx_utf8encoder.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_string.h"
#include "third_party/base/compiler_specific.h"
ByteString FX_UTF8Encode(const WideStringView& wsStr) {
size_t len = wsStr.GetLength();
const wchar_t* pStr = wsStr.unterminated_c_str();
CFX_UTF8Encoder encoder;
while (len-- > 0)
encoder.Input(*pStr++);
return ByteString(encoder.GetResult());
}
WideString FX_UTF8Decode(const 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 {
const float fraction_scales[] = {0.1f, 0.01f, 0.001f,
0.0001f, 0.00001f, 0.000001f,
0.0000001f, 0.00000001f, 0.000000001f,
0.0000000001f, 0.00000000001f};
float FractionalScale(size_t scale_factor, int value) {
return fraction_scales[scale_factor] * value;
}
} // namespace
bool FX_atonum(const ByteStringView& strc, void* pData) {
if (strc.Contains('.')) {
float* pFloat = static_cast<float*>(pData);
*pFloat = FX_atof(strc);
return false;
}
// Note, numbers in PDF are typically of the form 123, -123, etc. But,
// for things like the Permissions on the encryption hash the number is
// actually an unsigned value. We use a uint32_t so we can deal with the
// unsigned and then check for overflow if the user actually signed the value.
// The Permissions flag is listed in Table 3.20 PDF 1.7 spec.
pdfium::base::CheckedNumeric<uint32_t> integer = 0;
bool bNegative = false;
bool bSigned = false;
size_t cc = 0;
if (strc[0] == '+') {
cc++;
bSigned = true;
} else if (strc[0] == '-') {
bNegative = true;
bSigned = true;
cc++;
}
while (cc < strc.GetLength() && std::isdigit(strc[cc])) {
integer = integer * 10 + FXSYS_DecimalCharToInt(strc.CharAt(cc));
if (!integer.IsValid())
break;
cc++;
}
// We have a sign, and the value was greater then a regular integer
// we've overflowed, reset to the default value.
if (bSigned) {
if (bNegative) {
if (integer.ValueOrDefault(0) >
static_cast<uint32_t>(std::numeric_limits<int>::max()) + 1) {
integer = 0;
}
} else if (integer.ValueOrDefault(0) >
static_cast<uint32_t>(std::numeric_limits<int>::max())) {
integer = 0;
}
}
// Switch back to the int space so we can flip to a negative if we need.
uint32_t uValue = integer.ValueOrDefault(0);
int32_t value = static_cast<int>(uValue);
if (bNegative) {
// |value| is usually positive, except in the corner case of "-2147483648",
// where |uValue| is 2147483648. When it gets casted to an int, |value|
// becomes -2147483648. For this case, avoid undefined behavior, because an
// integer cannot represent 2147483648.
static constexpr int kMinInt = std::numeric_limits<int>::min();
value = LIKELY(value != kMinInt) ? -value : kMinInt;
}
int* pInt = static_cast<int*>(pData);
*pInt = value;
return true;
}
float FX_atof(const ByteStringView& strc) {
if (strc.IsEmpty())
return 0.0;
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++;
}
float value = 0;
while (cc < len) {
if (strc[cc] == '.')
break;
value = value * 10 + FXSYS_DecimalCharToInt(strc.CharAt(cc));
cc++;
}
int scale = 0;
if (cc < len && strc[cc] == '.') {
cc++;
while (cc < len) {
value += FractionalScale(scale, FXSYS_DecimalCharToInt(strc.CharAt(cc)));
scale++;
if (scale == FX_ArraySize(fraction_scales))
break;
cc++;
}
}
return bNegative ? -value : value;
}
float FX_atof(const WideStringView& wsStr) {
return FX_atof(FX_UTF8Encode(wsStr).c_str());
}
size_t FX_ftoa(float d, char* buf) {
buf[0] = '0';
buf[1] = '\0';
if (d == 0.0f) {
return 1;
}
bool bNegative = false;
if (d < 0) {
bNegative = true;
d = -d;
}
int scale = 1;
int scaled = FXSYS_round(d);
while (scaled < 100000) {
if (scale == 1000000) {
break;
}
scale *= 10;
scaled = FXSYS_round(d * 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;
}
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