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Added ability to use file checksum as filename by #1555
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core/data/src/main/java/ru/tech/imageresizershrinker/core/data/utils/ChecksumUtils.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| /* | ||
| * ImageToolbox is an image editor for android | ||
| * Copyright (c) 2024 T8RIN (Malik Mukhametzyanov) | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * You should have received a copy of the Apache License | ||
| * along with this program. If not, see <http://www.apache.org/licenses/LICENSE-2.0>. | ||
| */ | ||
|
|
||
| package ru.tech.imageresizershrinker.core.data.utils | ||
|
|
||
| import ru.tech.imageresizershrinker.core.domain.model.ChecksumType | ||
| import java.io.File | ||
| import java.io.InputStream | ||
| import java.security.MessageDigest | ||
|
|
||
| private const val STREAM_BUFFER_LENGTH = 1024 | ||
|
|
||
| internal fun ChecksumType.computeFromFile( | ||
| filePath: String | ||
| ): String = computeFromFile(File(filePath)) | ||
|
|
||
| internal fun ChecksumType.computeFromFile( | ||
| file: File | ||
| ): String = file.inputStream().use { | ||
| computeFromInputStream(it) | ||
| } | ||
|
|
||
| internal fun ChecksumType.computeFromByteArray( | ||
| byteArray: ByteArray | ||
| ): String = byteArray.inputStream().use { | ||
| computeFromInputStream(it) | ||
| } | ||
|
|
||
| internal fun ChecksumType.computeFromInputStream( | ||
| inputStream: InputStream | ||
| ): String { | ||
| val byteArray = updateDigest(inputStream).digest() | ||
| val hexCode = encodeHex(byteArray, true) | ||
| return String(hexCode) | ||
| } | ||
|
|
||
| /** | ||
| * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order. | ||
| * The returned array will be double the length of the passed array, as it takes two characters to represent any | ||
| * given byte. | ||
| * | ||
| * @param data a byte[] to convert to Hex characters | ||
| * @param toLowerCase `true` converts to lowercase, `false` to uppercase | ||
| * @return A char[] containing hexadecimal characters in the selected case | ||
| */ | ||
| internal fun encodeHex( | ||
| data: ByteArray, | ||
| toLowerCase: Boolean | ||
| ): CharArray = encodeHex( | ||
| data = data, | ||
| toDigits = if (toLowerCase) { | ||
| DIGITS_LOWER | ||
| } else { | ||
| DIGITS_UPPER | ||
| } | ||
| ) | ||
|
|
||
| /** | ||
| * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order. | ||
| * The returned array will be double the length of the passed array, as it takes two characters to represent any | ||
| * given byte. | ||
| * | ||
| * @param data a byte[] to convert to Hex characters | ||
| * @param toDigits the output alphabet (must contain at least 16 chars) | ||
| * @return A char[] containing the appropriate characters from the alphabet | ||
| * For best results, this should be either upper- or lower-case hex. | ||
| */ | ||
| internal fun encodeHex( | ||
| data: ByteArray, | ||
| toDigits: CharArray | ||
| ): CharArray { | ||
| val l = data.size | ||
| val out = CharArray(l shl 1) | ||
| // two characters form the hex value. | ||
| var i = 0 | ||
| var j = 0 | ||
| while (i < l) { | ||
| out[j++] = toDigits[0xF0 and data[i].toInt() ushr 4] | ||
| out[j++] = toDigits[0x0F and data[i].toInt()] | ||
| i++ | ||
| } | ||
| return out | ||
| } | ||
|
|
||
| /** | ||
| * Reads through an InputStream and updates the digest for the data | ||
| * | ||
| * @param ChecksumType The ChecksumType to use (e.g. MD5) | ||
| * @param data Data to digest | ||
| * @return the digest | ||
| */ | ||
| private fun ChecksumType.updateDigest( | ||
| data: InputStream | ||
| ): MessageDigest { | ||
| val digest = toDigest() | ||
|
|
||
| val buffer = ByteArray(STREAM_BUFFER_LENGTH) | ||
| var read = data.read(buffer, 0, STREAM_BUFFER_LENGTH) | ||
| while (read > -1) { | ||
| digest.update(buffer, 0, read) | ||
| read = data.read(buffer, 0, STREAM_BUFFER_LENGTH) | ||
| } | ||
| return digest | ||
| } | ||
|
|
||
| /** | ||
| * Used to build output as Hex | ||
| */ | ||
| private val DIGITS_LOWER = | ||
| charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f') | ||
|
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| /** | ||
| * Used to build output as Hex | ||
| */ | ||
| private val DIGITS_UPPER = | ||
| charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F') | ||
|
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| private fun ChecksumType.toDigest(): MessageDigest = MessageDigest.getInstance(digest) |
67 changes: 67 additions & 0 deletions
67
core/domain/src/main/kotlin/ru/tech/imageresizershrinker/core/domain/model/ChecksumType.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| /* | ||
| * ImageToolbox is an image editor for android | ||
| * Copyright (c) 2024 T8RIN (Malik Mukhametzyanov) | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * You should have received a copy of the Apache License | ||
| * along with this program. If not, see <http://www.apache.org/licenses/LICENSE-2.0>. | ||
| */ | ||
|
|
||
| package ru.tech.imageresizershrinker.core.domain.model | ||
|
|
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| class ChecksumType private constructor( | ||
| val digest: String | ||
| ) { | ||
| override fun toString(): String = "ChecksumType($digest)" | ||
|
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| companion object { | ||
| val MD2 = ChecksumType("MD2") | ||
| val MD5 = ChecksumType("MD5") | ||
| val SHA_1 = ChecksumType("SHA-1") | ||
| val SHA_224 = ChecksumType("SHA-224") | ||
| val SHA_256 = ChecksumType("SHA-256") | ||
| val SHA_384 = ChecksumType("SHA-384") | ||
| val SHA_512 = ChecksumType("SHA-512") | ||
| // Not supported by Android | ||
| // val SHA_512_224 = ChecksumType("SHA-512/224") | ||
| // val SHA_512_256 = ChecksumType("SHA-512/256") | ||
| // val SHA3_224 = ChecksumType("SHA3-224") | ||
| // val SHA3_256 = ChecksumType("SHA3-256") | ||
| // val SHA3_384 = ChecksumType("SHA3-384") | ||
| // val SHA3_512 = ChecksumType("SHA3-512") | ||
|
|
||
| val entries: List<ChecksumType> by lazy { | ||
| listOf( | ||
| MD2, | ||
| MD5, | ||
| SHA_1, | ||
| SHA_224, | ||
| SHA_256, | ||
| SHA_384, | ||
| SHA_512, | ||
| // SHA_512_224, | ||
| // SHA_512_256, | ||
| // SHA3_224, | ||
| // SHA3_256, | ||
| // SHA3_384, | ||
| // SHA3_512, | ||
| ) | ||
| } | ||
|
|
||
| fun fromString( | ||
| digest: String? | ||
| ): ChecksumType? = digest?.let { | ||
| entries.find { | ||
| it.digest == digest | ||
| } | ||
| } | ||
| } | ||
| } |
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