| 371 | } |
| 372 | |
| 373 | bool CheckMinimalPush(const std::vector<unsigned char>& data, opcodetype opcode) { |
| 374 | // Excludes OP_1NEGATE, OP_1-16 since they are by definition minimal |
| 375 | assert(0 <= opcode && opcode <= OP_PUSHDATA4); |
| 376 | if (data.size() == 0) { |
| 377 | // Should have used OP_0. |
| 378 | return opcode == OP_0; |
| 379 | } else if (data.size() == 1 && data[0] >= 1 && data[0] <= 16) { |
| 380 | // Should have used OP_1 .. OP_16. |
| 381 | return false; |
| 382 | } else if (data.size() == 1 && data[0] == 0x81) { |
| 383 | // Should have used OP_1NEGATE. |
| 384 | return false; |
| 385 | } else if (data.size() <= 75) { |
| 386 | // Must have used a direct push (opcode indicating number of bytes pushed + those bytes). |
| 387 | return opcode == data.size(); |
| 388 | } else if (data.size() <= 255) { |
| 389 | // Must have used OP_PUSHDATA. |
| 390 | return opcode == OP_PUSHDATA1; |
| 391 | } else if (data.size() <= 65535) { |
| 392 | // Must have used OP_PUSHDATA2. |
| 393 | return opcode == OP_PUSHDATA2; |
| 394 | } |
| 395 | return true; |
| 396 | } |