void
header_removal_compressor_c::compress(memory_cptr &buffer) {
if (!m_bytes.is_set() || (0 == m_bytes->get_size()))
return;
size_t size = m_bytes->get_size();
if (buffer->get_size() < size)
throw mtx::compression_x(boost::format(Y("Header removal compression not possible because the buffer contained %1% bytes "
"which is less than the size of the headers that should be removed, %2%.")) % buffer->get_size() % size);
unsigned char *buffer_ptr = buffer->get_buffer();
unsigned char *bytes_ptr = m_bytes->get_buffer();
if (memcmp(buffer_ptr, bytes_ptr, size)) {
std::string b_buffer, b_bytes;
size_t i;
for (i = 0; size > i; ++i) {
b_buffer += (boost::format(" %|1$02x|") % static_cast<unsigned int>(buffer_ptr[i])).str();
b_bytes += (boost::format(" %|1$02x|") % static_cast<unsigned int>(bytes_ptr[i])).str();
}
throw mtx::compression_x(boost::format(Y("Header removal compression not possible because the buffer did not start with the bytes that should be removed. "
"Wanted bytes:%1%; found:%2%.")) % b_bytes % b_buffer);
}
size_t new_size = buffer->get_size() - size;
if (buffer->is_free()) {
memmove(buffer_ptr, buffer_ptr + size, new_size);
buffer->set_size(new_size);
} else
buffer = clone_memory(buffer_ptr + size, new_size);
}
