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|
{
"schemaVersion": "2.0.0",
"contractName": "TestLibMem",
"compilerOutput": {
"abi": [
{
"constant": true,
"inputs": [
{
"name": "mem",
"type": "bytes"
},
{
"name": "dest",
"type": "uint256"
},
{
"name": "source",
"type": "uint256"
},
{
"name": "length",
"type": "uint256"
}
],
"name": "testMemcpy",
"outputs": [
{
"name": "",
"type": "bytes"
}
],
"payable": false,
"stateMutability": "pure",
"type": "function"
}
],
"evm": {
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"linkReferences": {},
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"sourceMap": "647:1044:0:-;;;;8:9:-1;5:2;;;30:1;27;20:12;5:2;647:1044:0;;;;;;;"
},
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"linkReferences": {},
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}
}
},
"sources": {
"current/test/TestLibMem/TestLibMem.sol": {
"id": 0
},
"current/utils/LibMem/LibMem.sol": {
"id": 1
}
},
"sourceCodes": {
"current/test/TestLibMem/TestLibMem.sol": "/*\n\n Copyright 2018 ZeroEx Intl.\n\n Licensed under the Apache License, Version 2.0 (the \"License\");\n you may not use this file except in compliance with the License.\n You may obtain a copy of the License at\n\n http://www.apache.org/licenses/LICENSE-2.0\n\n Unless required by applicable law or agreed to in writing, software\n distributed under the License is distributed on an \"AS IS\" BASIS,\n WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n See the License for the specific language governing permissions and\n limitations under the License.\n\n*/\n\npragma solidity ^0.4.24;\n\nimport \"../../utils/LibMem/LibMem.sol\";\n\ncontract TestLibMem is\n LibMem\n{\n\n /// @dev Copies a block of memory from one location to another.\n /// @param mem Memory contents we want to apply memCopy to\n /// @param dest Destination offset into <mem>.\n /// @param source Source offset into <mem>.\n /// @param length Length of bytes to copy from <source> to <dest>\n /// @return mem Memory contents after calling memCopy.\n function testMemcpy(\n bytes mem,\n uint256 dest,\n uint256 source,\n uint256 length\n )\n public // not external, we need input in memory\n pure\n returns (bytes)\n {\n // Sanity check. Overflows are not checked.\n require(source + length <= mem.length);\n require(dest + length <= mem.length);\n\n // Get pointer to memory contents\n uint256 offset = getMemAddress(mem) + 32;\n\n // Execute memCopy adjusted for memory array location\n memCopy(offset + dest, offset + source, length);\n\n // Return modified memory contents\n return mem;\n }\n}\n",
"current/utils/LibMem/LibMem.sol": "/*\n\n Copyright 2018 ZeroEx Intl.\n\n Licensed under the Apache License, Version 2.0 (the \"License\");\n you may not use this file except in compliance with the License.\n You may obtain a copy of the License at\n\n http://www.apache.org/licenses/LICENSE-2.0\n\n Unless required by applicable law or agreed to in writing, software\n distributed under the License is distributed on an \"AS IS\" BASIS,\n WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n See the License for the specific language governing permissions and\n limitations under the License.\n\n*/\n\npragma solidity ^0.4.24;\n\ncontract LibMem\n{\n\n /// @dev Gets the memory address for a byte array.\n /// @param input Byte array to lookup.\n /// @return memoryAddress Memory address of byte array.\n function getMemAddress(bytes memory input)\n internal\n pure\n returns (uint256 memoryAddress)\n {\n assembly {\n memoryAddress := input\n }\n return memoryAddress;\n }\n\n /// @dev Copies `length` bytes from memory location `source` to `dest`.\n /// @param dest memory address to copy bytes to.\n /// @param source memory address to copy bytes from.\n /// @param length number of bytes to copy.\n function memCopy(\n uint256 dest,\n uint256 source,\n uint256 length\n )\n internal\n pure\n {\n if (length < 32) {\n // Handle a partial word by reading destination and masking\n // off the bits we are interested in.\n // This correctly handles overlap, zero lengths and source == dest\n assembly {\n let mask := sub(exp(256, sub(32, length)), 1)\n let s := and(mload(source), not(mask))\n let d := and(mload(dest), mask)\n mstore(dest, or(s, d))\n }\n } else {\n // Skip the O(length) loop when source == dest.\n if (source == dest) {\n return;\n }\n\n // For large copies we copy whole words at a time. The final\n // word is aligned to the end of the range (instead of after the\n // previous) to handle partial words. So a copy will look like this:\n //\n // ####\n // ####\n // ####\n // ####\n //\n // We handle overlap in the source and destination range by\n // changing the copying direction. This prevents us from\n // overwriting parts of source that we still need to copy.\n //\n // This correctly handles source == dest\n //\n if (source > dest) {\n assembly {\n // We subtract 32 from `sEnd` and `dEnd` because it\n // is easier to compare with in the loop, and these\n // are also the addresses we need for copying the\n // last bytes.\n length := sub(length, 32)\n let sEnd := add(source, length)\n let dEnd := add(dest, length)\n\n // Remember the last 32 bytes of source\n // This needs to be done here and not after the loop\n // because we may have overwritten the last bytes in\n // source already due to overlap.\n let last := mload(sEnd)\n\n // Copy whole words front to back\n // Note: the first check is always true,\n // this could have been a do-while loop.\n for {} lt(source, sEnd) {} {\n mstore(dest, mload(source))\n source := add(source, 32)\n dest := add(dest, 32)\n }\n \n // Write the last 32 bytes\n mstore(dEnd, last)\n }\n } else {\n assembly {\n // We subtract 32 from `sEnd` and `dEnd` because those\n // are the starting points when copying a word at the end.\n length := sub(length, 32)\n let sEnd := add(source, length)\n let dEnd := add(dest, length)\n\n // Remember the first 32 bytes of source\n // This needs to be done here and not after the loop\n // because we may have overwritten the first bytes in\n // source already due to overlap.\n let first := mload(source)\n\n // Copy whole words back to front\n // We use a signed comparisson here to allow dEnd to become\n // negative (happens when source and dest < 32). Valid\n // addresses in local memory will never be larger than\n // 2**255, so they can be safely re-interpreted as signed.\n // Note: the first check is always true,\n // this could have been a do-while loop.\n for {} slt(dest, dEnd) {} {\n mstore(dEnd, mload(sEnd))\n sEnd := sub(sEnd, 32)\n dEnd := sub(dEnd, 32)\n }\n \n // Write the first 32 bytes\n mstore(dest, first)\n }\n }\n }\n }\n}\n"
},
"sourceTreeHashHex": "0x14fbc5358b631676094b7448a680cd6c5c3e577c3db52fd62e0d97bdc54a1d4c",
"compiler": {
"name": "solc",
"version": "soljson-v0.4.24+commit.e67f0147.js",
"settings": {
"optimizer": {
"enabled": true,
"runs": 200
},
"outputSelection": {
"*": {
"*": [
"abi",
"evm.bytecode.object",
"evm.bytecode.sourceMap",
"evm.deployedBytecode.object",
"evm.deployedBytecode.sourceMap"
]
}
}
}
},
"networks": {}
}
|
