{ "contractName": "Buffer", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.7.4+commit.3f05b770\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"A library for working with mutable byte buffers in Solidity. Byte buffers are mutable and expandable, and provide a variety of primitives for writing to them. At any time you can fetch a bytes object containing the current contents of the buffer. 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At any time you can fetch a bytes object containing the\n* current contents of the buffer. The bytes object should not be stored between\n* operations, as it may change due to resizing of the buffer.\n*/\nlibrary Buffer {\n /**\n * @dev Represents a mutable buffer. Buffers have a current value (buf) and\n * a capacity. The capacity may be longer than the current value, in\n * which case it can be extended without the need to allocate more memory.\n */\n struct buffer {\n bytes buf;\n uint capacity;\n }\n\n /**\n * @dev Initializes a buffer with an initial capacity.\n * @param buf The buffer to initialize.\n * @param capacity The number of bytes of space to allocate the buffer.\n * @return The buffer, for chaining.\n */\n function init(buffer memory buf, uint capacity) internal pure returns(buffer memory) {\n if (capacity % 32 != 0) {\n capacity += 32 - (capacity % 32);\n }\n // Allocate space for the buffer data\n buf.capacity = capacity;\n assembly {\n let ptr := mload(0x40)\n mstore(buf, ptr)\n mstore(ptr, 0)\n mstore(0x40, add(ptr, capacity))\n }\n return buf;\n }\n\n /**\n * @dev Initializes a new buffer from an existing bytes object.\n * Changes to the buffer may mutate the original value.\n * @param b The bytes object to initialize the buffer with.\n * @return A new buffer.\n */\n function fromBytes(bytes memory b) internal pure returns(buffer memory) {\n buffer memory buf;\n buf.buf = b;\n buf.capacity = b.length;\n return buf;\n }\n\n function resize(buffer memory buf, uint capacity) private pure {\n bytes memory oldbuf = buf.buf;\n init(buf, capacity);\n append(buf, oldbuf);\n }\n\n function max(uint a, uint b) private pure returns(uint) {\n if (a > b) {\n return a;\n }\n return b;\n }\n\n /**\n * @dev Sets buffer length to 0.\n * @param buf The buffer to truncate.\n * @return The original buffer, for chaining..\n */\n function truncate(buffer memory buf) internal pure returns (buffer memory) {\n assembly {\n let bufptr := mload(buf)\n mstore(bufptr, 0)\n }\n return buf;\n }\n\n /**\n * @dev Writes a byte string to a buffer. Resizes if doing so would exceed\n * the capacity of the buffer.\n * @param buf The buffer to append to.\n * @param off The start offset to write to.\n * @param data The data to append.\n * @param len The number of bytes to copy.\n * @return The original buffer, for chaining.\n */\n function write(buffer memory buf, uint off, bytes memory data, uint len) internal pure returns(buffer memory) {\n require(len <= data.length);\n\n if (off + len + buf.buf.length > buf.capacity) {\n resize(buf, max(buf.capacity, len + off) * 2);\n }\n\n uint dest;\n uint src;\n assembly {\n // Memory address of the buffer data\n let bufptr := mload(buf)\n // Length of existing buffer data\n let buflen := mload(bufptr)\n // Start address = buffer address + offset + sizeof(buffer length)\n dest := add(add(bufptr, 32), off)\n // Update buffer length if we're extending it\n if gt(add(len, off), buflen) {\n mstore(bufptr, add(len, off))\n }\n src := add(data, 32)\n }\n\n // Copy word-length chunks while possible\n for (; len >= 32; len -= 32) {\n assembly {\n mstore(dest, mload(src))\n }\n dest += 32;\n src += 32;\n }\n\n // Copy remaining bytes\n uint mask = 256 ** (32 - len) - 1;\n assembly {\n let srcpart := and(mload(src), not(mask))\n let destpart := and(mload(dest), mask)\n mstore(dest, or(destpart, srcpart))\n }\n\n return buf;\n }\n\n /**\n * @dev Appends a byte string to a buffer. Resizes if doing so would exceed\n * the capacity of the buffer.\n * @param buf The buffer to append to.\n * @param data The data to append.\n * @param len The number of bytes to copy.\n * @return The original buffer, for chaining.\n */\n function append(buffer memory buf, bytes memory data, uint len) internal pure returns (buffer memory) {\n return write(buf, buf.buf.length, data, len);\n }\n\n /**\n * @dev Appends a byte string to a buffer. Resizes if doing so would exceed\n * the capacity of the buffer.\n * @param buf The buffer to append to.\n * @param data The data to append.\n * @return The original buffer, for chaining.\n */\n function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) {\n return write(buf, buf.buf.length, data, data.length);\n }\n\n /**\n * @dev Writes a byte to the buffer. Resizes if doing so would exceed the\n * capacity of the buffer.\n * @param buf The buffer to append to.\n * @param off The offset to write the byte at.\n * @param data The data to append.\n * @return The original buffer, for chaining.\n */\n function writeUint8(buffer memory buf, uint off, uint8 data) internal pure returns(buffer memory) {\n if (off > buf.capacity) {\n resize(buf, buf.capacity * 2);\n }\n\n assembly {\n // Memory address of the buffer data\n let bufptr := mload(buf)\n // Length of existing buffer data\n let buflen := mload(bufptr)\n // Address = buffer address + sizeof(buffer length) + off\n let dest := add(add(bufptr, off), 32)\n mstore8(dest, data)\n // Update buffer length if we extended it\n if eq(off, buflen) {\n mstore(bufptr, add(buflen, 1))\n }\n }\n return buf;\n }\n\n /**\n * @dev Appends a byte to the buffer. Resizes if doing so would exceed the\n * capacity of the buffer.\n * @param buf The buffer to append to.\n * @param data The data to append.\n * @return The original buffer, for chaining.\n */\n function appendUint8(buffer memory buf, uint8 data) internal pure returns(buffer memory) {\n return writeUint8(buf, buf.buf.length, data);\n }\n\n /**\n * @dev Writes up to 32 bytes to the buffer. 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Resizes if doing so would exceed the\n capacity of the buffer.\n @param buf The buffer to append to.\n @param off The offset to write the byte at.\n @param data The data to append.\n @return The original buffer, for chaining." }, "id": 1233, "name": "StructuredDocumentation", "src": "5121:301:6" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "buf", "scope": 1262, "stateVariable": false, "storageLocation": "memory", "type": "struct Buffer.buffer", "visibility": "internal" }, "children": [ { "attributes": { "name": "buffer", "referencedDeclaration": 986, "type": "struct Buffer.buffer" }, "id": 1234, "name": "UserDefinedTypeName", "src": "5447:6:6" } ], "id": 1235, "name": "VariableDeclaration", "src": "5447:17:6" }, { "attributes": { "constant": false, "mutability": "mutable", "name": "off", "scope": 1262, "stateVariable": false, "storageLocation": "default", "type": "uint256", "visibility": "internal" }, "children": [ { "attributes": { "name": 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Resizes if doing so would exceed the\n capacity of the buffer.\n @param buf The buffer to append to.\n @param data The data to append.\n @return The original buffer, for chaining." }, "id": 1263, "name": "StructuredDocumentation", "src": "6147:252:6" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "buf", "scope": 1281, "stateVariable": false, "storageLocation": "memory", "type": "struct Buffer.buffer", "visibility": "internal" }, "children": [ { "attributes": { "name": "buffer", "referencedDeclaration": 986, "type": "struct Buffer.buffer" }, "id": 1264, "name": "UserDefinedTypeName", "src": "6425:6:6" } ], "id": 1265, "name": "VariableDeclaration", "src": "6425:17:6" }, { "attributes": { "constant": false, "mutability": "mutable", "name": "data", "scope": 1281, "stateVariable": false, "storageLocation": "default", "type": "uint8", "visibility": "internal" }, "children": [ { "attributes": { "name": "uint8", "type": "uint8" }, "id": 1266, "name": "ElementaryTypeName", "src": "6444:5:6" } ], "id": 1267, "name": "VariableDeclaration", "src": "6444:10:6" } ], "id": 1268, "name": "ParameterList", "src": "6424:31:6" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "", "scope": 1281, "stateVariable": false, "storageLocation": "memory", "type": "struct Buffer.buffer", "visibility": "internal" }, "children": [ { "attributes": { "name": "buffer", "referencedDeclaration": 986, "type": "struct Buffer.buffer" }, "id": 1269, "name": "UserDefinedTypeName", "src": "6478:6:6" } ], "id": 1270, "name": "VariableDeclaration", "src": "6478:13:6" } ], "id": 1271, "name": "ParameterList", "src": "6477:15:6" }, { "children": [ { "attributes": { "functionReturnParameters": 1271 }, "children": [ { "attributes": { "isConstant": false, "isLValue": false, "isPure": false, "isStructConstructorCall": false, "lValueRequested": false, "names": [ null ], "tryCall": false, "type": "struct Buffer.buffer memory", "type_conversion": false }, "children": [ { "attributes": { "argumentTypes": [ { "typeIdentifier": "t_struct$_buffer_$986_memory_ptr", "typeString": "struct Buffer.buffer memory" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_uint8", "typeString": "uint8" } ], "overloadedDeclarations": [ null ], "referencedDeclaration": 1262, "type": "function (struct Buffer.buffer memory,uint256,uint8) pure returns (struct Buffer.buffer memory)", "value": "writeUint8" }, "id": 1272, "name": "Identifier", "src": "6510:10:6" }, { "attributes": { "overloadedDeclarations": [ null ], "referencedDeclaration": 1265, "type": "struct Buffer.buffer memory", "value": "buf" }, "id": 1273, "name": "Identifier", "src": "6521:3:6" }, { "attributes": { "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "member_name": "length", "type": "uint256" }, "children": [ { "attributes": { "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "member_name": "buf", "referencedDeclaration": 983, "type": "bytes memory" }, "children": [ { "attributes": { "overloadedDeclarations": [ null ], "referencedDeclaration": 1265, "type": "struct Buffer.buffer memory", "value": "buf" }, "id": 1274, "name": "Identifier", "src": "6526:3:6" } ], "id": 1275, "name": "MemberAccess", "src": "6526:7:6" } ], "id": 1276, "name": "MemberAccess", "src": "6526:14:6" }, { "attributes": { "overloadedDeclarations": [ null ], "referencedDeclaration": 1267, "type": "uint8", "value": "data" }, "id": 1277, "name": "Identifier", "src": "6542:4:6" } ], "id": 1278, "name": "FunctionCall", "src": "6510:37:6" } ], "id": 1279, "name": "Return", "src": "6503:44:6" } ], "id": 1280, "name": "Block", "src": "6493:61:6" } ], "id": 1281, "name": "FunctionDefinition", "src": "6404:150:6" }, { "attributes": { "implemented": true, "isConstructor": false, "kind": "function", "modifiers": [ null ], "name": "write", "scope": 1452, "stateMutability": "pure", "virtual": false, "visibility": "private" }, "children": [ { "attributes": { "text": " @dev Writes up to 32 bytes to the buffer. 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