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Script: functional-style parseIntoChunks(), parseIntoChunksPartial()

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This commit is contained in:
Sean Gilligan 2024-09-14 16:06:34 -07:00 committed by Andreas Schildbach
parent c97c9f8f06
commit 0cb413cc4f
1 changed files with 18 additions and 5 deletions
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23
core/src/main/java/org/bitcoinj/script/Script.java
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@ -276,16 +276,29 @@ public class Script {
public static Script parse(byte[] program, Instant creationTime) throws ScriptException {
Objects.requireNonNull(creationTime);
program = Arrays.copyOf(program, program.length); // defensive copy
List<ScriptChunk> chunks = new ArrayList<>(5); // common size
parseIntoChunks(program, chunks);
List<ScriptChunk> chunks = parseIntoChunks(program);
return new Script(program, chunks, creationTime);
}
/**
* To run a script, first we parse it which breaks it up into chunks representing pushes of data or logical
* opcodes. Then we can run the parsed chunks.
* @param program program bytes to parse
* @return An unmodifiable list of chunks
*/
private static void parseIntoChunks(byte[] program, List<ScriptChunk> chunks) throws ScriptException {
private static List<ScriptChunk> parseIntoChunks(byte[] program) throws ScriptException {
List<ScriptChunk> chunks = new ArrayList<>();
parseIntoChunksPartial(program, chunks);
return Collections.unmodifiableList(chunks);
}
/**
* Parse a script program into a mutable List of chunks. If an exception is thrown a partial parsing
* will be present in the provided chunk list.
* @param program The script program
* @param chunks An empty, mutable array to fill with chunks
*/
private static void parseIntoChunksPartial(byte[] program, List<ScriptChunk> chunks) throws ScriptException {
ByteArrayInputStream bis = new ByteArrayInputStream(program);
while (bis.available() > 0) {
int opcode = bis.read();
@ -685,7 +698,7 @@ public class Script {
public static int getSigOpCount(byte[] program) throws ScriptException {
List<ScriptChunk> chunks = new ArrayList<>(5); // common size
try {
parseIntoChunks(program, chunks);
parseIntoChunksPartial(program, chunks);
} catch (ScriptException e) {
// Ignore errors and count up to the parse-able length
}
@ -698,7 +711,7 @@ public class Script {
public static long getP2SHSigOpCount(byte[] scriptSig) throws ScriptException {
List<ScriptChunk> chunks = new ArrayList<>(5); // common size
try {
parseIntoChunks(scriptSig, chunks);
parseIntoChunksPartial(scriptSig, chunks);
} catch (ScriptException e) {
// Ignore errors and count up to the parse-able length
}