Read buffer in INI::Is_Declaration_Of_Type is written on

[xezon]

Read buffer in INI::Is_Declaration_Of_Type is written on to accommodate the parsing.

char c = buffer[block_type_len];
buffer[block_type_len] = 0;

if (strcasecmp(block_type.Str(), buffer) != 0) {
    ret = false;
}

buffer[block_type_len] = c;
buffer += block_type_len;

The better approach is to compare with a max length.

[xezon]

A few lines below there is

while (strlen(buffer) != 0) {
    ret = ret && isspace(*buffer);
    buffer++;
}

This is poor algorithm. There is no need to strlen() after incrementing position by one.

[xezon]

Same in INI::Is_End_Of_Block function.