Add streaming hash utility function to quartz multiplatform, follow the existing pool/worker design

Change hashing in ImageDownloader.kt to use streaming

quartz/src/jvmAndroid/kotlin/com/vitorpamplona/quartz/utils/sha256/Sha256.jvmAndroid.kt

@@ -20,6 +20,22 @@
  */
 package com.vitorpamplona.quartz.utils.sha256
 
+import java.io.InputStream
+
 val pool = Sha256Pool(5) // max parallel operations
 
 actual fun sha256(data: ByteArray) = pool.hash(data)
+
+/**
+ * Calculate SHA256 hash by streaming the input in chunks.
+ * This avoids loading the entire input into memory at once.
+ * Useful for hashing large files without running out of memory.
+ *
+ * @param inputStream The input stream to hash
+ * @param bufferSize Size of chunks to read (default 8KB)
+ * @return SHA256 hash bytes
+ */
+fun sha256Stream(
+    inputStream: InputStream,
+    bufferSize: Int = 8192,
+) = pool.hashStream(inputStream, bufferSize)

quartz/src/jvmAndroid/kotlin/com/vitorpamplona/quartz/utils/sha256/Sha256Hasher.jvmAndroid.kt

@@ -20,6 +20,7 @@
  */
 package com.vitorpamplona.quartz.utils.sha256
 
+import java.io.InputStream
 import java.security.MessageDigest
 
 class Sha256Hasher {
@@ -30,4 +31,26 @@ class Sha256Hasher {
     fun digest(byteArray: ByteArray) = digest.digest(byteArray)
 
     fun reset() = digest.reset()
+
+    /**
+     * Calculate SHA256 hash by streaming the input in chunks.
+     * This avoids loading the entire input into memory at once.
+     *
+     * @param inputStream The input stream to hash
+     * @param bufferSize Size of chunks to read (default 8KB)
+     * @return SHA256 hash bytes
+     */
+    fun hashStream(
+        inputStream: InputStream,
+        bufferSize: Int = 8192,
+    ): ByteArray {
+        val buffer = ByteArray(bufferSize)
+        var bytesRead: Int
+
+        while (inputStream.read(buffer).also { bytesRead = it } != -1) {
+            digest.update(buffer, 0, bytesRead)
+        }
+
+        return digest.digest().also { digest.reset() }
+    }
 }

quartz/src/jvmAndroid/kotlin/com/vitorpamplona/quartz/utils/sha256/Sha256Pool.jvmAndroid.kt

@@ -21,6 +21,7 @@
 package com.vitorpamplona.quartz.utils.sha256
 
 import com.vitorpamplona.quartz.utils.Log
+import java.io.InputStream
 import java.util.concurrent.ArrayBlockingQueue
 
 class Sha256Pool(
@@ -54,4 +55,24 @@ class Sha256Pool(
             release(hasher)
         }
     }
+
+    /**
+     * Calculate SHA256 hash by streaming the input in chunks.
+     * This avoids loading the entire input into memory at once.
+     *
+     * @param inputStream The input stream to hash
+     * @param bufferSize Size of chunks to read (default 8KB)
+     * @return SHA256 hash bytes
+     */
+    fun hashStream(
+        inputStream: InputStream,
+        bufferSize: Int = 8192,
+    ): ByteArray {
+        val hasher = acquire()
+        try {
+            return hasher.hashStream(inputStream, bufferSize)
+        } finally {
+            release(hasher)
+        }
+    }
 }