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core_read.cpp
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// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "core_io.h"
#include "primitives/block.h"
#include "primitives/transaction.h"
#include "script/script.h"
#include "serialize.h"
#include "streams.h"
#include "util.h"
#include "utilstrencodings.h"
#include "version.h"
#include <univalue.h>
#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/split.hpp>
CScript ParseScript(const std::string &s) {
CScript result;
static std::map<std::string, opcodetype> mapOpNames;
if (mapOpNames.empty()) {
for (int op = 0; op < FIRST_UNDEFINED_OP_VALUE; op++) {
if (op < OP_PUSHDATA1) {
continue;
}
const char *name = GetOpName((opcodetype)op);
if (strcmp(name, "OP_UNKNOWN") == 0) {
continue;
}
std::string strName(name);
mapOpNames[strName] = (opcodetype)op;
// Convenience: OP_ADD and just ADD are both recognized:
boost::algorithm::replace_first(strName, "OP_", "");
mapOpNames[strName] = (opcodetype)op;
}
}
std::vector<std::string> words;
boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"),
boost::algorithm::token_compress_on);
size_t push_size = 0, next_push_size = 0;
size_t script_size = 0;
// Deal with PUSHDATA1 operation with some more hacks.
size_t push_data_size = 0;
for (const auto &w : words) {
if (w.empty()) {
// Empty string, ignore. (boost::split given '' will return one
// word)
continue;
}
// Update script size.
script_size = result.size();
// Make sure we keep track of the size of push operations.
push_size = next_push_size;
next_push_size = 0;
// Decimal numbers
if (all(w, boost::algorithm::is_digit()) ||
(boost::algorithm::starts_with(w, "-") &&
all(std::string(w.begin() + 1, w.end()),
boost::algorithm::is_digit()))) {
// Number
int64_t n = atoi64(w);
result << n;
goto next;
}
// Hex Data
if (boost::algorithm::starts_with(w, "0x") &&
(w.begin() + 2 != w.end())) {
if (!IsHex(std::string(w.begin() + 2, w.end()))) {
// Should only arrive here for improperly formatted hex values
throw std::runtime_error("Hex numbers expected to be formatted "
"in full-byte chunks (ex: 0x00 "
"instead of 0x0)");
}
// Raw hex data, inserted NOT pushed onto stack:
std::vector<uint8_t> raw =
ParseHex(std::string(w.begin() + 2, w.end()));
result.insert(result.end(), raw.begin(), raw.end());
goto next;
}
if (w.size() >= 2 && boost::algorithm::starts_with(w, "'") &&
boost::algorithm::ends_with(w, "'")) {
// Single-quoted string, pushed as data. NOTE: this is poor-man's
// parsing, spaces/tabs/newlines in single-quoted strings won't
// work.
std::vector<uint8_t> value(w.begin() + 1, w.end() - 1);
result << value;
goto next;
}
if (mapOpNames.count(w)) {
// opcode, e.g. OP_ADD or ADD:
opcodetype op = mapOpNames[w];
result << op;
goto next;
}
throw std::runtime_error("Error parsing script: " + s);
next:
size_t size_change = result.size() - script_size;
// If push_size is set, ensure have added the right amount of stuff.
if (push_size != 0 && size_change != push_size) {
throw std::runtime_error(
"Wrong number of bytes being pushed. Expected:" +
std::to_string(push_size) +
" Pushed:" + std::to_string(size_change));
}
// If push_size is set, and we have push_data_size set, then we have a
// PUSHDATAX opcode. We need to read it's push size as a LE value for
// the next iteration of this loop.
if (push_size != 0 && push_data_size != 0) {
auto offset = &result[script_size];
// Push data size is not a CScriptNum (Because it is
// 2's-complement instead of 1's complement). We need to use
// ReadLE(N) instead of converting to a CScriptNum.
if (push_data_size == 1) {
next_push_size = *offset;
} else if (push_data_size == 2) {
next_push_size = ReadLE16(offset);
} else if (push_data_size == 4) {
next_push_size = ReadLE32(offset);
}
push_data_size = 0;
}
// If push_size is unset, but size_change is 1, that means we have an
// opcode in the form of `0x00` or <opcodename>. We will check to see
// if it is a push operation and set state accordingly
if (push_size == 0 && size_change == 1) {
opcodetype op = opcodetype(*result.rbegin());
// If we have what looks like an immediate push, figure out its
// size.
if (op < OP_PUSHDATA1) {
next_push_size = op;
continue;
}
switch (op) {
case OP_PUSHDATA1:
push_data_size = next_push_size = 1;
break;
case OP_PUSHDATA2:
push_data_size = next_push_size = 2;
break;
case OP_PUSHDATA4:
push_data_size = next_push_size = 4;
break;
default:
break;
}
}
}
return result;
}
bool DecodeHexTx(CMutableTransaction &tx, const std::string &strHexTx) {
if (!IsHex(strHexTx)) {
return false;
}
std::vector<uint8_t> txData(ParseHex(strHexTx));
CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION);
try {
ssData >> tx;
if (!ssData.empty()) {
return false;
}
} catch (const std::exception &) {
return false;
}
return true;
}
bool DecodeHexBlk(CBlock &block, const std::string &strHexBlk) {
if (!IsHex(strHexBlk)) {
return false;
}
std::vector<uint8_t> blockData(ParseHex(strHexBlk));
CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
try {
ssBlock >> block;
} catch (const std::exception &) {
return false;
}
return true;
}
uint256 ParseHashUV(const UniValue &v, const std::string &strName) {
std::string strHex;
if (v.isStr()) {
strHex = v.getValStr();
}
// Note: ParseHashStr("") throws a runtime_error
return ParseHashStr(strHex, strName);
}
uint256 ParseHashStr(const std::string &strHex, const std::string &strName) {
if (!IsHex(strHex)) {
// Note: IsHex("") is false
throw std::runtime_error(
strName + " must be hexadecimal string (not '" + strHex + "')");
}
uint256 result;
result.SetHex(strHex);
return result;
}
std::vector<uint8_t> ParseHexUV(const UniValue &v, const std::string &strName) {
std::string strHex;
if (v.isStr()) {
strHex = v.getValStr();
}
if (!IsHex(strHex)) {
throw std::runtime_error(
strName + " must be hexadecimal string (not '" + strHex + "')");
}
return ParseHex(strHex);
}

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core_read.cpp (7 KB)

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