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Improve Base32.cpp

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This commit is contained in:
Adolfo E. García 2017-11-07 00:08:01 -06:00
parent b28333ea0d
commit c9895dd5c7
1 changed files with 14 additions and 9 deletions
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23
src/core/Base32.cpp
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@ -52,8 +52,9 @@ QVariant Base32::decode(const QByteArray& encodedData)
int nPads = 0;
for (int i = -1; i > -7; --i) {
if ('=' == encodedData[encodedData.size() + i])
if ('=' == encodedData[encodedData.size() + i]) {
++nPads;
}
}
int specialOffset;
@ -95,11 +96,12 @@ QVariant Base32::decode(const QByteArray& encodedData)
int nQuantumBytes = 5;
for (int n = 0; n < 8; ++n) {
quint8 ch = static_cast<quint8>(encodedData[i++]);
auto ch = static_cast<quint8>(encodedData[i++]);
if ((ASCII_A <= ch && ch <= ASCII_Z) || (ASCII_a <= ch && ch <= ASCII_z)) {
ch -= ASCII_A;
if (ch >= ALPH_POS_2)
if (ch >= ALPH_POS_2) {
ch -= ASCII_a - ASCII_A;
}
} else {
if (ASCII_2 <= ch && ch <= ASCII_7) {
ch -= ASCII_2;
@ -126,8 +128,8 @@ QVariant Base32::decode(const QByteArray& encodedData)
const int offset = (nQuantumBytes - 1) * 8;
quint64 mask = quint64(0xFF) << offset;
for (int n = offset; n >= 0 && o < nBytes; n -= 8) {
data[o++] = static_cast<char>((quantum & mask) >> n);
mask >>= 8;
data[o++] = static_cast<char>((quantum & mask) >> n);
mask >>= 8;
}
}
@ -147,7 +149,7 @@ QByteArray Base32::encode(const QByteArray& data)
const int rBits = nBits % 40; // in {0, 8, 16, 24, 32}
const int nQuanta = nBits / 40 + (rBits > 0 ? 1 : 0);
const int nBytes = nQuanta * 8;
QByteArray encodedData(nQuanta * 8, Qt::Uninitialized);
QByteArray encodedData(nBytes, Qt::Uninitialized);
int i = 0;
int o = 0;
@ -166,6 +168,7 @@ QByteArray Base32::encode(const QByteArray& data)
int index;
for (n = 35; n >= 0; n -= 5) {
index = (quantum & mask) >> n;
Q_ASSERT(0 <= index && index <= 31);
encodedData[o++] = alphabet[index];
mask >>= 5;
}
@ -173,10 +176,11 @@ QByteArray Base32::encode(const QByteArray& data)
// < 40-bits of input at final input group
if (i < data.size()) {
Q_ASSERT(rBits > 0);
Q_ASSERT(8 <= rBits && rBits <= 32);
quantum = 0;
for (n = rBits - 8; n >= 0; n -= 8)
for (n = rBits - 8; n >= 0; n -= 8) {
quantum |= static_cast<quint64>(data[i++]) << n;
}
switch (rBits) {
case 8: // expand to 10 bits
@ -195,7 +199,7 @@ QByteArray Base32::encode(const QByteArray& data)
n = 20;
break;
default: // expand to 35 bits
Q_ASSERT(rBits == 32);
Q_ASSERT(32 == rBits);
quantum <<= 3;
mask = MASK_35BIT;
n = 30;
@ -203,6 +207,7 @@ QByteArray Base32::encode(const QByteArray& data)
while (n >= 0) {
int index = (quantum & mask) >> n;
Q_ASSERT(0 <= index && index <= 31);
encodedData[o++] = alphabet[index];
mask >>= 5;
n -= 5;