Markdown (H1)

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H2

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H3

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H4

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H5

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H6

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Horizontal Rules

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Emphasis

Bold

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Italic

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Lists

Ordered list

1. Vivamus tristique
2. Hendrerit sem
3. Vitae pulvinar quam

Ordered list

• Imperdiet ac
• Fusce ut efficitur
• In finibus felis

Nested list

1. Make my changes
   1. Fix bug
   2. Improve formatting
      • Make the headings bigger
2. Push my commits to GitHub
3. Open a pull request
   • Describe my changes
   • Mention all the members of my team
     • Ask for feedback

Quotes

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Morbi id nisi lectus.

Code

Inline code

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Code block

float Q_rsqrt( float number )
{
  long i;
  float x2, y;
  const float threehalfs = 1.5F;  
  x2 = number * 0.5F;
  y  = number;
  i  = * ( long * ) &y;                       // evil floating point bit level hacking
  i  = 0x5f3759df - ( i >> 1 );               // what the fuck?
  y  = * ( float * ) &i;
  y  = y * ( threehalfs - ( x2 * y * y ) );   // 1st iteration
//	y  = y * ( threehalfs - ( x2 * y * y ) );   // 2nd iteration, this can be removed

  return y;
}

Collapsable code block

// Copyright (c) 2017-2021 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 <consensus/tx_check.h>

#include <consensus/amount.h>
#include <primitives/transaction.h>
#include <consensus/validation.h>

bool CheckTransaction(const CTransaction& tx, TxValidationState& state)
{
  // Basic checks that don't depend on any context
  if (tx.vin.empty())
      return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vin-empty");
  if (tx.vout.empty())
      return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-empty");
  // Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
  if (::GetSerializeSize(TX_NO_WITNESS(tx)) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT) {
      return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-oversize");
  }

  // Check for negative or overflow output values (see CVE-2010-5139)
  CAmount nValueOut = 0;
  for (const auto& txout : tx.vout)
  {
      if (txout.nValue < 0)
          return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-negative");
      if (txout.nValue > MAX_MONEY)
          return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-toolarge");
      nValueOut += txout.nValue;
      if (!MoneyRange(nValueOut))
          return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-txouttotal-toolarge");
  }

  // Check for duplicate inputs (see CVE-2018-17144)
  // While Consensus::CheckTxInputs does check if all inputs of a tx are available, and UpdateCoins marks all inputs
  // of a tx as spent, it does not check if the tx has duplicate inputs.
  // Failure to run this check will result in either a crash or an inflation bug, depending on the implementation of
  // the underlying coins database.
  std::set<COutPoint> vInOutPoints;
  for (const auto& txin : tx.vin) {
      if (!vInOutPoints.insert(txin.prevout).second)
          return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-inputs-duplicate");
  }

  if (tx.IsCoinBase())
  {
      if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
          return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-cb-length");
  }
  else
  {
      for (const auto& txin : tx.vin)
          if (txin.prevout.IsNull())
              return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-prevout-null");
  }

  return true;
}

Links

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