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#include "dfusefile.h"
#include <QDebug>
#include "debug.h"
static const auto DFUSE_SUFFIX_SIZE = 16;
DfuseFile::DfuseFile(QIODevice *file)
{
m_isValid = readPrefix(file);
check_return_void(m_isValid, "Failed to read DfuSe file prefix");
for(auto i = 0; i < m_prefix.bTargets; ++i) {
m_isValid = readImage(file);
check_return_void(m_isValid, "Failed to read DfuSe image");
}
m_isValid = readSuffix(file);
check_return_void(m_isValid, "No valid DfuSe suffix");
file->reset();
m_isValid = checkCRC(file);
check_return_void(m_isValid, "Checksum doesn't match");
}
bool DfuseFile::isValid() const
{
return m_isValid;
}
const DfuseFile::Prefix &DfuseFile::prefix() const
{
return m_prefix;
}
const DfuseFile::Suffix &DfuseFile::suffix() const
{
return m_suffix;
}
QList<DfuseFile::Image> &DfuseFile::images()
{
return m_images;
}
bool DfuseFile::readPrefix(QIODevice *file)
{
const auto DFUSE_PREFIX_SIZE = 11;
const auto PREFIX_SIGNATURE_SIZE = 5;
check_return_bool(file->bytesAvailable() >= DFUSE_PREFIX_SIZE, "File is too short");
m_prefix.szSignature = file->read(PREFIX_SIGNATURE_SIZE);
check_return_bool(m_prefix.szSignature == "DfuSe", "Not a valid DfuSe file");
file->read((char*)&m_prefix.bVersion, sizeof(uint8_t));
file->read((char*)&m_prefix.DFUImageSize, sizeof(uint32_t));
file->read((char*)&m_prefix.bTargets, sizeof(uint8_t));
check_return_bool(m_prefix.DFUImageSize == (file->size() - DFUSE_SUFFIX_SIZE), "File size does not match");
return true;
}
bool DfuseFile::readSuffix(QIODevice *file)
{
m_suffix.ucDFUSignature = 0; // Just to be safe - we're reading only 3 bytes into it
file->read((char*)&m_suffix.bcdDevice, sizeof(uint16_t));
file->read((char*)&m_suffix.idProduct, sizeof(uint16_t));
file->read((char*)&m_suffix.idVendor, sizeof(uint16_t));
file->read((char*)&m_suffix.bcdDFU, sizeof(uint16_t));
file->read((char*)&m_suffix.ucDFUSignature, 3);
file->read((char*)&m_suffix.bLength, sizeof(uint8_t));
file->read((char*)&m_suffix.dwCRC, sizeof(uint32_t));
const auto res = (m_suffix.ucDFUSignature == 0x444655) && (m_suffix.bLength == DFUSE_SUFFIX_SIZE);
check_continue(res, "Failed to read DfuSe suffix");
return res;
}
bool DfuseFile::readImage(QIODevice *file)
{
const auto TARGET_SIGNATURE_SIZE = 6;
const auto TARGET_NAME_SIZE = 255;
Image img;
img.prefix.szSignature = file->read(TARGET_SIGNATURE_SIZE);
check_return_bool(img.prefix.szSignature == "Target", "Not a valid DfuSe target image");
file->read((char*)&img.prefix.bAlternateSetting, sizeof(uint8_t));
file->read((char*)&img.prefix.bTargetNamed, sizeof(uint32_t));
img.prefix.szTargetName = file->read(TARGET_NAME_SIZE);
file->read((char*)&img.prefix.dwtargetSize, sizeof(uint32_t));
file->read((char*)&img.prefix.dwNbElements, sizeof(uint32_t));
m_images.append(img);
for(uint32_t i = 0; i < img.prefix.dwNbElements; ++i) {
readElement(file);
}
return true;
}
void DfuseFile::readElement(QIODevice *file)
{
Image::Element el;
file->read((char*)&el.dwElementAddress, sizeof(uint32_t));
file->read((char*)&el.dwElementSize, sizeof(uint32_t));
el.data = file->read(el.dwElementSize);
m_images.last().elements.append(el);
}
bool DfuseFile::checkCRC(QIODevice *file)
{
return m_suffix.dwCRC == generateCRC(file);
}
uint32_t DfuseFile::generateCRC(QIODevice *file)
{
const auto LUT_SIZE = 256;
uint32_t lut[LUT_SIZE];
for(auto i = 0; i < LUT_SIZE; ++i) {
uint32_t val = i;
for(auto j = 0; j < 8; ++j) {
val = (val & 1U) ? 0xEDB88320U ^ (val >> 1) : val >> 1;
}
lut[i] = val;
}
uint32_t val = UINT32_MAX;
uint8_t c;
while((size_t)file->bytesAvailable() > sizeof(uint32_t)) {
file->getChar((char*)&c);
val = lut[(val ^ c) & UINT8_MAX] ^ (val >> 8);
}
return val;
}
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