public void SetTrimmedFlag(MemoryMappedFile file)
{
// Assume the whole useful part of the header is in one block - likely is for v1
using (MemoryMappedViewStream header = file.CreateViewStream(0, BLOCK_SIZE))
{
psv_file_header_v1 headerStruct = ReadStructure <psv_file_header_v1>(header);
headerStruct.flags |= FLAG_TRIMMED;
header.Position = 0;
WriteStructure(headerStruct, header);
}
}
public bool ValidateHeader(MemoryMappedFile file, string filepath)
{
// Assume the whole useful part of the header is in one block - likely is for v1
using (MemoryMappedViewStream header = file.CreateViewStream(0, BLOCK_SIZE))
{
psv_file_header_base basicHeaderStruct = ReadStructure <psv_file_header_base>(header);
// Check the magic and version - only v1 is defined so far
if (basicHeaderStruct.magic != PSV_MAGIC || basicHeaderStruct.version != PSV_VERSION_V1)
{
Log("Could not parse PSV v1 header.");
return(false);
}
header.Position = 0;
psv_file_header_v1 headerStruct = ReadStructure <psv_file_header_v1>(header);
// If it's already trimmed, abort
if ((headerStruct.flags & FLAG_TRIMMED) == FLAG_TRIMMED)
{
Log("Image is already trimmed.");
return(false);
}
var fileInfo = new FileInfo(filepath);
// Validate the file size - offset sector implicitly equals the number of header blocks
if (((headerStruct.image_offset_sector * BLOCK_SIZE) + headerStruct.image_size) != (ulong)fileInfo.Length)
{
Log("Image size is invalid.");
return(false);
}
Log("Parsed PSV v1 header - image is valid.");
return(true);
}
}
