diff options
Diffstat (limited to 'src/compressor.cpp')
| -rw-r--r-- | src/compressor.cpp | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/src/compressor.cpp b/src/compressor.cpp index 86de2900e9..da639a01af 100644 --- a/src/compressor.cpp +++ b/src/compressor.cpp @@ -9,7 +9,15 @@ #include <pubkey.h> #include <script/standard.h> -bool CScriptCompressor::IsToKeyID(CKeyID &hash) const +/* + * These check for scripts for which a special case with a shorter encoding is defined. + * They are implemented separately from the CScript test, as these test for exact byte + * sequence correspondences, and are more strict. For example, IsToPubKey also verifies + * whether the public key is valid (as invalid ones cannot be represented in compressed + * form). + */ + +static bool IsToKeyID(const CScript& script, CKeyID &hash) { if (script.size() == 25 && script[0] == OP_DUP && script[1] == OP_HASH160 && script[2] == 20 && script[23] == OP_EQUALVERIFY @@ -20,7 +28,7 @@ bool CScriptCompressor::IsToKeyID(CKeyID &hash) const return false; } -bool CScriptCompressor::IsToScriptID(CScriptID &hash) const +static bool IsToScriptID(const CScript& script, CScriptID &hash) { if (script.size() == 23 && script[0] == OP_HASH160 && script[1] == 20 && script[22] == OP_EQUAL) { @@ -30,7 +38,7 @@ bool CScriptCompressor::IsToScriptID(CScriptID &hash) const return false; } -bool CScriptCompressor::IsToPubKey(CPubKey &pubkey) const +static bool IsToPubKey(const CScript& script, CPubKey &pubkey) { if (script.size() == 35 && script[0] == 33 && script[34] == OP_CHECKSIG && (script[1] == 0x02 || script[1] == 0x03)) { @@ -45,24 +53,24 @@ bool CScriptCompressor::IsToPubKey(CPubKey &pubkey) const return false; } -bool CScriptCompressor::Compress(std::vector<unsigned char> &out) const +bool CompressScript(const CScript& script, std::vector<unsigned char> &out) { CKeyID keyID; - if (IsToKeyID(keyID)) { + if (IsToKeyID(script, keyID)) { out.resize(21); out[0] = 0x00; memcpy(&out[1], &keyID, 20); return true; } CScriptID scriptID; - if (IsToScriptID(scriptID)) { + if (IsToScriptID(script, scriptID)) { out.resize(21); out[0] = 0x01; memcpy(&out[1], &scriptID, 20); return true; } CPubKey pubkey; - if (IsToPubKey(pubkey)) { + if (IsToPubKey(script, pubkey)) { out.resize(33); memcpy(&out[1], &pubkey[1], 32); if (pubkey[0] == 0x02 || pubkey[0] == 0x03) { @@ -76,7 +84,7 @@ bool CScriptCompressor::Compress(std::vector<unsigned char> &out) const return false; } -unsigned int CScriptCompressor::GetSpecialSize(unsigned int nSize) const +unsigned int GetSpecialScriptSize(unsigned int nSize) { if (nSize == 0 || nSize == 1) return 20; @@ -85,7 +93,7 @@ unsigned int CScriptCompressor::GetSpecialSize(unsigned int nSize) const return 0; } -bool CScriptCompressor::Decompress(unsigned int nSize, const std::vector<unsigned char> &in) +bool DecompressScript(CScript& script, unsigned int nSize, const std::vector<unsigned char> &in) { switch(nSize) { case 0x00: @@ -139,7 +147,7 @@ bool CScriptCompressor::Decompress(unsigned int nSize, const std::vector<unsigne // * if e==9, we only know the resulting number is not zero, so output 1 + 10*(n - 1) + 9 // (this is decodable, as d is in [1-9] and e is in [0-9]) -uint64_t CTxOutCompressor::CompressAmount(uint64_t n) +uint64_t CompressAmount(uint64_t n) { if (n == 0) return 0; @@ -158,7 +166,7 @@ uint64_t CTxOutCompressor::CompressAmount(uint64_t n) } } -uint64_t CTxOutCompressor::DecompressAmount(uint64_t x) +uint64_t DecompressAmount(uint64_t x) { // x = 0 OR x = 1+10*(9*n + d - 1) + e OR x = 1+10*(n - 1) + 9 if (x == 0) |