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examples: add support for code_copy

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Alex Beregszaszi 2019-08-08 18:33:53 +02:00 committed by Paweł Bylica
parent 4ee8ff83e5
commit e3dc816263
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1 changed files with 17 additions and 5 deletions
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20
examples/example_host.cpp
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@ -11,6 +11,7 @@
#include <evmc/evmc.hpp>
#include <map>
#include <vector>
using namespace evmc::literals;
@ -19,6 +20,7 @@ struct account
evmc::uint256be balance = {};
size_t code_size = 0;
evmc::bytes32 code_hash = {};
std::vector<uint8_t> code;
std::map<evmc::bytes32, evmc::bytes32> storage;
};
@ -84,11 +86,21 @@ public:
uint8_t* buffer_data,
size_t buffer_size) noexcept final
{
(void)addr;
(void)code_offset;
(void)buffer_data;
(void)buffer_size;
auto it = accounts.find(addr);
if (it == accounts.end())
return 0;
auto code = it->second.code;
if (code_offset >= code.size())
return 0;
// TODO: implement this more nicely?
auto begin = code.begin();
auto end = code.end();
std::advance(begin, static_cast<long>(code_offset));
auto len = std::distance(begin, end);
if (len > static_cast<long>(buffer_size))
std::advance(end, len - static_cast<long>(buffer_size));
std::copy(begin, end, buffer_data);
return static_cast<size_t>(len);
}
void selfdestruct(const evmc::address& addr, const evmc::address& beneficiary) noexcept final