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Copy pathiostream.cpp
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137 lines (117 loc) · 3.45 KB
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/* Copyright 2017 - 2025 R. Thomas
* Copyright 2017 - 2025 Quarkslab
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "LIEF/iostream.hpp"
namespace LIEF {
size_t vector_iostream::uleb128_size(uint64_t value) {
size_t size = 0;
do {
value >>= 7;
size += sizeof(int8_t);
} while(value != 0);
return size;
}
size_t vector_iostream::sleb128_size(int64_t value) {
size_t size = 0;
int sign = value >> (8 * sizeof(value) - 1);
bool is_more;
do {
size_t byte = value & 0x7F;
value >>= 7;
is_more = value != sign || ((byte ^ sign) & 0x40) != 0;
size += sizeof(int8_t);
} while (is_more);
return size;
}
vector_iostream& vector_iostream::put(uint8_t c) {
if (raw_->size() < (static_cast<size_t>(tellp()) + 1)) {
raw_->resize(static_cast<size_t>(tellp()) + 1);
}
(*raw_)[tellp()] = c;
current_pos_ += 1;
return *this;
}
vector_iostream& vector_iostream::write(const uint8_t* s, std::streamsize n) {
const auto pos = static_cast<size_t>(tellp());
if (raw_->size() < (pos + n)) {
raw_->resize(pos + n);
}
std::copy(s, s + n, raw_->data() + pos);
current_pos_ += n;
return *this;
}
vector_iostream& vector_iostream::write_uleb128(uint64_t value) {
uint8_t byte;
do {
byte = value & 0x7F;
value &= ~0x7F;
if (value != 0) {
byte |= 0x80;
}
write<uint8_t>(byte);
value = value >> 7;
} while (byte >= 0x80);
return *this;
}
vector_iostream& vector_iostream::write_sleb128(int64_t value) {
bool is_neg = (value < 0);
uint8_t byte;
bool more;
do {
byte = value & 0x7F;
value = value >> 7;
if (is_neg) {
more = ((value != -1) || ((byte & 0x40) == 0));
} else {
more = ((value != 0) || ((byte & 0x40) != 0));
}
if (more) {
byte |= 0x80;
}
write<uint8_t>(byte);
} while (more);
return *this;
}
vector_iostream& vector_iostream::seekp(vector_iostream::off_type p, std::ios_base::seekdir dir) {
switch (dir) {
case std::ios_base::beg: current_pos_ = p; return *this;
case std::ios_base::end: return *this;
case std::ios_base::cur: current_pos_ += p; return *this;
default: return *this;
}
return *this;
}
vector_iostream& vector_iostream::write(const std::u16string& s, bool with_null_char) {
const size_t nullchar = with_null_char ? 1 : 0;
const auto pos = static_cast<size_t>(tellp());
if (raw_->size() < (pos + s.size() + nullchar)) {
raw_->resize(pos + (s.size() + nullchar) * sizeof(char16_t));
}
std::copy(reinterpret_cast<const char16_t*>(s.data()),
reinterpret_cast<const char16_t*>(s.data()) + s.size(),
reinterpret_cast<char16_t*>(raw_->data() + current_pos_));
current_pos_ += (s.size() + nullchar) * sizeof(char16_t);
return *this;
}
vector_iostream& vector_iostream::align(size_t alignment, uint8_t fill) {
if (raw_->size() % alignment == 0) {
return *this;
}
while (raw_->size() % alignment != 0) {
write<uint8_t>(fill);
}
return *this;
}
}