diff options
Diffstat (limited to 'src/compressor.h')
| -rw-r--r-- | src/compressor.h | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/compressor.h b/src/compressor.h index 478bfff0b6..40b2496f06 100644 --- a/src/compressor.h +++ b/src/compressor.h @@ -6,14 +6,26 @@ #ifndef BITCOIN_COMPRESSOR_H #define BITCOIN_COMPRESSOR_H +#include <prevector.h> #include <primitives/transaction.h> #include <script/script.h> #include <serialize.h> #include <span.h> -bool CompressScript(const CScript& script, std::vector<unsigned char> &out); +/** + * This saves us from making many heap allocations when serializing + * and deserializing compressed scripts. + * + * This prevector size is determined by the largest .resize() in the + * CompressScript function. The largest compressed script format is a + * compressed public key, which is 33 bytes. + */ +using CompressedScript = prevector<33, unsigned char>; + + +bool CompressScript(const CScript& script, CompressedScript& out); unsigned int GetSpecialScriptSize(unsigned int nSize); -bool DecompressScript(CScript& script, unsigned int nSize, const std::vector<unsigned char> &out); +bool DecompressScript(CScript& script, unsigned int nSize, const CompressedScript& in); /** * Compress amount. @@ -51,7 +63,7 @@ struct ScriptCompression template<typename Stream> void Ser(Stream &s, const CScript& script) { - std::vector<unsigned char> compr; + CompressedScript compr; if (CompressScript(script, compr)) { s << MakeSpan(compr); return; @@ -66,7 +78,7 @@ struct ScriptCompression unsigned int nSize = 0; s >> VARINT(nSize); if (nSize < nSpecialScripts) { - std::vector<unsigned char> vch(GetSpecialScriptSize(nSize), 0x00); + CompressedScript vch(GetSpecialScriptSize(nSize), 0x00); s >> MakeSpan(vch); DecompressScript(script, nSize, vch); return; |