55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
// Copyright 2019 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cstring>
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#include <string>
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#include "common/logging/log.h"
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#include "core/file_sys/patch.h"
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namespace FileSys::Patch {
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bool ApplyIpsPatch(const std::vector<u8>& ips, std::vector<u8>& buffer) {
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u32 cursor = 5;
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u32 patch_length = ips.size() - 3;
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std::string ips_header(ips.begin(), ips.begin() + 5);
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if (ips_header != "PATCH") {
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LOG_INFO(Service_FS, "Attempted to load invalid IPS");
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return false;
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}
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while (cursor < patch_length) {
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std::string eof_check(ips.begin() + cursor, ips.begin() + cursor + 3);
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if (eof_check == "EOF")
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return false;
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u32 offset = ips[cursor] << 16 | ips[cursor + 1] << 8 | ips[cursor + 2];
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std::size_t length = ips[cursor + 3] << 8 | ips[cursor + 4];
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// check for an rle record
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if (length == 0) {
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length = ips[cursor + 5] << 8 | ips[cursor + 6];
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if (buffer.size() < offset + length)
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return false;
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for (u32 i = 0; i < length; ++i)
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buffer[offset + i] = ips[cursor + 7];
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cursor += 8;
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continue;
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}
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if (buffer.size() < offset + length)
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return false;
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std::memcpy(&buffer[offset], &ips[cursor + 5], length);
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cursor += length + 5;
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}
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return true;
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}
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} // namespace FileSys::Patch
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