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implement save file decryption/encryption

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This commit is contained in:
Martin Michelsen
2023-03-31 23:56:25 -07:00
parent 06ba95ed97
commit 3b9a76eec8
39 changed files with 666 additions and 205 deletions
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src/CommandFormats.hh
+11 -9
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@@ -1905,8 +1905,11 @@ struct S_ExecuteCode_B2 {
// The code immediately follows, ending with an S_ExecuteCode_Footer_B2
} __packed__;
template <typename LongT>
template <bool IsBigEndian>
struct S_ExecuteCode_Footer_B2 {
using U16T = typename std::conditional<IsBigEndian, be_uint16_t, le_uint16_t>:: type;
using U32T = typename std::conditional<IsBigEndian, be_uint32_t, le_uint32_t>:: type;
// Relocations is a list of words (le_uint16_t on DC/PC/XB/BB, be_uint16_t on
// GC) containing the number of doublewords (uint32_t) to skip for each
// relocation. The relocation pointer starts immediately after the
@@ -1925,19 +1928,18 @@ struct S_ExecuteCode_Footer_B2 {
// relocations_offset points there, so those 12 bytes may also be omitted from
// the command entirely (without changing code_size - so code_size would
// technically extend beyond the end of the B2 command).
LongT relocations_offset = 0; // Relative to code base (after checksum_size)
LongT num_relocations = 0;
parray<LongT, 2> unused1;
U32T relocations_offset = 0; // Relative to code base (after checksum_size)
U32T num_relocations = 0;
parray<U32T, 2> unused1;
// entrypoint_offset is doubly indirect - it points to a pointer to a 32-bit
// value that itself is the actual entrypoint. This is presumably done so the
// entrypoint can be optionally relocated.
LongT entrypoint_addr_offset = 0; // Relative to code base (after checksum_size).
parray<LongT, 3> unused2;
U32T entrypoint_addr_offset = 0; // Relative to code base (after checksum_size).
parray<U32T, 3> unused2;
} __packed__;
struct S_ExecuteCode_Footer_GC_B2 : S_ExecuteCode_Footer_B2<be_uint32_t> { } __packed__;
struct S_ExecuteCode_Footer_DC_PC_XB_BB_B2
: S_ExecuteCode_Footer_B2<le_uint32_t> { } __packed__;
struct S_ExecuteCode_Footer_GC_B2 : S_ExecuteCode_Footer_B2<true> { } __packed__;
struct S_ExecuteCode_Footer_DC_PC_XB_BB_B2 : S_ExecuteCode_Footer_B2<false> { } __packed__;
// B3 (C->S): Execute code and/or checksum memory result
// Not used on versions that don't support the B2 command (see above).