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Use constant offsets instead of 1-byte arrays

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vit9696 2021-10-14 04:08:24 +03:00 committed by Vitaly Cheptsov
parent fae9d6681d
commit d9af12b567
2 changed files with 10 additions and 6 deletions
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8
common/ffs.h
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@ -753,9 +753,11 @@ typedef struct CPD_EXT_SIGNED_PACKAGE_INFO_MODULE_ {
UINT8 HashAlgorithm;
UINT16 HashSize;
UINT32 MetadataSize;
UINT8 MetadataHash[1]; // Can be 32 or 48 bit
// UINT8 MetadataHash[]; with the actual hash size is 32 or 48 bytes
} CPD_EXT_SIGNED_PACKAGE_INFO_MODULE;
static const size_t CpdExtSignedPkgMetadataHashOffset = sizeof(CPD_EXT_SIGNED_PACKAGE_INFO_MODULE);
typedef struct CPD_EXT_SIGNED_PACKAGE_INFO_ {
UINT32 ExtensionType;
UINT32 ExtensionLength;
@ -774,9 +776,11 @@ typedef struct CPD_EXT_MODULE_ATTRIBUTES_ {
UINT32 UncompressedSize;
UINT32 CompressedSize;
UINT32 GlobalModuleId;
UINT8 ImageHash[1]; // The actual hash size is 32 or 48 bytes
// UINT8 ImageHash[]; with the actual hash size is 32 or 48 bytes
} CPD_EXT_MODULE_ATTRIBUTES;
static const size_t CpdExtModuleImageHashOffset = sizeof(CPD_EXT_MODULE_ATTRIBUTES);
#define CPD_EXT_MODULE_COMPRESSION_TYPE_UNCOMPRESSED 0
#define CPD_EXT_MODULE_COMPRESSION_TYPE_HUFFMAN 1
#define CPD_EXT_MODULE_COMPRESSION_TYPE_LZMA 2

8
common/ffsparser.cpp
View file

@ -5170,11 +5170,11 @@ USTATUS FfsParser::parseCpdExtensionsArea(const UModelIndex & index)
// Parse Module Attributes a bit further
else if (extHeader->Type == CPD_EXT_TYPE_MODULE_ATTRIBUTES) {
const CPD_EXT_MODULE_ATTRIBUTES* attrHeader = (const CPD_EXT_MODULE_ATTRIBUTES*)partition.constData();
int hashSize = partition.size() - offsetof(CPD_EXT_MODULE_ATTRIBUTES, ImageHash);
int hashSize = partition.size() - CpdExtModuleImageHashOffset;
// This hash is stored reversed
// Need to reverse it back to normal
UByteArray hash((const char*)&attrHeader->ImageHash, hashSize);
UByteArray hash((const char*)attrHeader + CpdExtModuleImageHashOffset, hashSize);
std::reverse(hash.begin(), hash.end());
info = usprintf("Full size: %" PRIXQ "h (%" PRIuQ ")\nType: %Xh\n"
@ -5226,12 +5226,12 @@ USTATUS FfsParser::parseSignedPackageInfoData(const UModelIndex & index)
const CPD_EXT_SIGNED_PACKAGE_INFO_MODULE* moduleHeader = (const CPD_EXT_SIGNED_PACKAGE_INFO_MODULE*)(body.constData() + offset);
if (sizeof(CPD_EXT_SIGNED_PACKAGE_INFO_MODULE) <= ((UINT32)body.size() - offset)) {
// TODO: check sanity of moduleHeader->HashSize
UByteArray module((const char*)moduleHeader, sizeof(CPD_EXT_SIGNED_PACKAGE_INFO_MODULE) - sizeof(moduleHeader->MetadataHash) + moduleHeader->HashSize);
UByteArray module((const char*)moduleHeader, CpdExtSignedPkgMetadataHashOffset + moduleHeader->HashSize);
UString name = usprintf("%.12s", moduleHeader->Name);
// This hash is stored reversed
// Need to reverse it back to normal
UByteArray hash((const char*)&moduleHeader->MetadataHash, moduleHeader->HashSize);
UByteArray hash((const char*)moduleHeader + CpdExtSignedPkgMetadataHashOffset, moduleHeader->HashSize);
std::reverse(hash.begin(), hash.end());
UString info = usprintf("Full size: %" PRIXQ "h (%" PRIuQ ")\nType: %Xh\nHash algorithm: %Xh\nHash size: %Xh (%u)\nMetadata size: %Xh (%u)\nMetadata hash: ",