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AK: Add IntrusiveList::take_last()

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This commit is contained in:
Andreas Kling 2020-11-24 16:37:55 +01:00
parent 3e3a72f2a2
commit c33d71c5ff
2 changed files with 25 additions and 13 deletions
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27
AK/MemoryStream.h
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@ -96,9 +96,9 @@ public:
bool read_LEB128_unsigned(size_t& result)
{
const auto backup = m_offset;
result = 0;
size_t shift = 0;
result = 0;
size_t num_bytes = 0;
while (true) {
if (eof()) {
m_offset = backup;
@ -106,11 +106,12 @@ public:
return false;
}
const u8 byte = m_bytes[m_offset++];
result |= (byte & 0x7f) << shift;
if ((byte & 0x80) == 0)
const u8 byte = m_bytes[m_offset];
result = (result) | (static_cast<size_t>(byte & ~(1 << 7)) << (num_bytes * 7));
++m_offset;
if (!(byte & (1 << 7)))
break;
shift += 7;
++num_bytes;
}
return true;
@ -121,11 +122,9 @@ public:
const auto backup = m_offset;
result = 0;
size_t shift = 0;
size_t num_bytes = 0;
u8 byte = 0;
size_t size = sizeof(ssize_t) * 8;
do {
if (eof()) {
m_offset = backup;
@ -133,13 +132,15 @@ public:
return false;
}
byte = m_bytes[m_offset++];
result |= (byte & 0x7f) << shift;
byte = m_bytes[m_offset];
result = (result) | (static_cast<size_t>(byte & ~(1 << 7)) << (num_bytes * 7));
++m_offset;
++num_bytes;
} while (byte & (1 << 7));
if (shift < size && (byte & 0x40)) {
if (num_bytes * 7 < sizeof(size_t) * 4 && (byte & 0x40)) {
// sign extend
result |= (0xffffffffu << shift);
result |= ((size_t)(-1) << (num_bytes * 7));
}
return true;