-
Notifications
You must be signed in to change notification settings - Fork 130
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge branch 'bitflow-scraper-update'
- Loading branch information
Showing
9 changed files
with
532 additions
and
105 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package stackshelper | ||
|
|
||
| import ( | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "errors" | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| const c32table = "0123456789ABCDEFGHJKMNPQRSTVWXYZ" | ||
| const hextable = "0123456789abcdef" | ||
|
|
||
| func c32address(version int, hash160hex string) (string, error) { | ||
| match, err := regexp.MatchString("^[0-9a-fA-F]{40}$", hash160hex) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| if !match { | ||
| return "", errors.New("not a hash160 hex string") | ||
| } | ||
|
|
||
| c32str, err := c32checkEncode(version, hash160hex) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return "S" + c32str, nil | ||
| } | ||
|
|
||
| func c32checkEncode(version int, data string) (string, error) { | ||
| if version < 0 || version >= 32 { | ||
| return "", errors.New("invalid version (must be between 0 and 31)") | ||
| } | ||
|
|
||
| data = strings.ToLower(data) | ||
| if len(data)%2 != 0 { | ||
| data = "0" + data | ||
| } | ||
| versionHex := fmt.Sprintf("%02x", version) | ||
|
|
||
| checksum, err := c32checksum(versionHex + data) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| c32str, err := c32encode(data + checksum) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(c32table[version]) + c32str, nil | ||
| } | ||
|
|
||
| func c32checksum(dataHex string) (string, error) { | ||
| bytes, err := hex.DecodeString(dataHex) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| inner := sha256.Sum256(bytes) | ||
| checksum := sha256.Sum256(inner[:]) | ||
| return hex.EncodeToString(checksum[0:4]), nil | ||
| } | ||
|
|
||
| func c32encode(inputHex string) (string, error) { | ||
| if len(inputHex)%2 != 0 { | ||
| inputHex = "0" + inputHex | ||
| } | ||
| inputHex = strings.ToLower(inputHex) | ||
|
|
||
| inputBytes, err := hex.DecodeString(inputHex) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| res := make([]byte, 0) | ||
| carry := 0 | ||
|
|
||
| for i := len(inputHex) - 1; i >= 0; i-- { | ||
| if carry < 4 { | ||
| currentCode := strings.IndexByte(hextable, inputHex[i]) >> carry | ||
| nextCode := 0 | ||
| if i != 0 { | ||
| nextCode = strings.IndexByte(hextable, inputHex[i-1]) | ||
| } | ||
|
|
||
| nextBits := 1 + carry | ||
| nextLowBits := nextCode % (1 << nextBits) << (5 - nextBits) | ||
| curC32Digit := c32table[currentCode+nextLowBits] | ||
|
|
||
| res = append([]byte{curC32Digit}, res...) | ||
| carry = nextBits | ||
| } else { | ||
| carry = 0 | ||
| } | ||
| } | ||
|
|
||
| c32LeadingZeros := 0 | ||
| for _, d := range res { | ||
| if d != '0' { | ||
| break | ||
| } else { | ||
| c32LeadingZeros++ | ||
| } | ||
| } | ||
| res = res[c32LeadingZeros:] | ||
|
|
||
| numLeadingZeroBytesInHex := 0 | ||
| for _, b := range inputBytes { | ||
| if b != 0 { | ||
| break | ||
| } | ||
| numLeadingZeroBytesInHex++ | ||
| } | ||
|
|
||
| for i := 0; i < numLeadingZeroBytesInHex; i++ { | ||
| res = append([]byte{c32table[0]}, res...) | ||
| } | ||
| return string(res), nil | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.