[KLIB] Add API to access file's part of data as ByteArray

It requires for computing fingerprint of IrFile in IC infra

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IncrementalCompilationSupport.kt

@@ -84,6 +84,16 @@ class ICKotlinLibrary(private val icData: List<SerializedIrFile>) : IrLibrary {
     override fun file(index: Int): ByteArray = icData[index].fileData
 
     override fun fileCount(): Int = icData.size
+
+    override fun types(fileIndex: Int): ByteArray = icData[fileIndex].types
+
+    override fun signatures(fileIndex: Int): ByteArray = icData[fileIndex].signatures
+
+    override fun strings(fileIndex: Int): ByteArray = icData[fileIndex].strings
+
+    override fun declarations(fileIndex: Int): ByteArray = icData[fileIndex].declarations
+
+    override fun bodies(fileIndex: Int): ByteArray = icData[fileIndex].bodies
 }
 
 class CurrentModuleWithICDeserializer(

compiler/util-klib/src/org/jetbrains/kotlin/library/KotlinLibrary.kt

@@ -67,6 +67,12 @@ interface IrLibrary {
     fun debugInfo(index: Int, fileIndex: Int): ByteArray?
     fun file(index: Int): ByteArray
     fun fileCount(): Int
+
+    fun types(fileIndex: Int): ByteArray
+    fun signatures(fileIndex: Int): ByteArray
+    fun strings(fileIndex: Int): ByteArray
+    fun declarations(fileIndex: Int): ByteArray
+    fun bodies(fileIndex: Int): ByteArray
 }
 
 val BaseKotlinLibrary.uniqueName: String

compiler/util-klib/src/org/jetbrains/kotlin/library/impl/IrFileReaders.kt

@@ -99,12 +99,12 @@ abstract class IrMultiArrayReader(private val buffer: ReadBuffer) {
     fun tableItemBytes(row: Int, column: Int): ByteArray {
         val rowOffset = indexToOffset[row]
 
-        val collumnOffsets = indexIndexToOffset.getOrPut(row) {
+        val columnOffsets = indexIndexToOffset.getOrPut(row) {
             readOffsets(rowOffset)
         }
 
-        val dataOffset = collumnOffsets[column]
-        val dataSize = collumnOffsets[column + 1] - dataOffset
+        val dataOffset = columnOffsets[column]
+        val dataSize = columnOffsets[column + 1] - dataOffset
         val result = ByteArray(dataSize)
 
         buffer.position = rowOffset + dataOffset
@@ -155,6 +155,16 @@ abstract class IrMultiTableReader<K>(private val buffer: ReadBuffer, private val
         return result
     }
 
+    fun tableItemBytes(idx: Int): ByteArray {
+        val rowOffset = indexToOffset[idx]
+        val nextOffset = indexToOffset[idx + 1]
+        val size = nextOffset - rowOffset
+        val result = ByteArray(size)
+        buffer.position = rowOffset
+        buffer.get(result, 0, size)
+        return result
+    }
+
     fun tableItemBytes(row: Int, id: K): ByteArray {
 
         val rowOffset = indexToOffset[row]

compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryImpl.kt

@@ -156,6 +156,26 @@ class IrMonoliticLibraryImpl(_access: IrLibraryAccess<IrKotlinLibraryLayout>) :
             it.irFiles
         })
     }
+
+    override fun types(fileIndex: Int): ByteArray {
+        return types.tableItemBytes(fileIndex)
+    }
+
+    override fun signatures(fileIndex: Int): ByteArray {
+        return signatures.tableItemBytes(fileIndex)
+    }
+
+    override fun strings(fileIndex: Int): ByteArray {
+        return strings.tableItemBytes(fileIndex)
+    }
+
+    override fun declarations(fileIndex: Int): ByteArray {
+        return combinedDeclarations.tableItemBytes(fileIndex)
+    }
+
+    override fun bodies(fileIndex: Int): ByteArray {
+        return bodies.tableItemBytes(fileIndex)
+    }
 }
 
 class IrPerFileLibraryImpl(_access: IrLibraryAccess<IrKotlinLibraryLayout>) : IrLibraryImpl(_access) {
@@ -188,13 +208,17 @@ class IrPerFileLibraryImpl(_access: IrLibraryAccess<IrKotlinLibraryLayout>) : Ir
         return dataReader.tableItemBytes(index)
     }
 
-    override fun signature(index: Int, fileIndex: Int): ByteArray {
-        val dataReader = fileToTypeMap.getOrPut(fileIndex) {
+    private fun signatureDataReader(fileIndex: Int): IrArrayFileReader {
+        return fileToTypeMap.getOrPut(fileIndex) {
             val fileDirectory = directories[fileIndex]
             IrArrayFileReader(access.realFiles {
                 it.irSignatures(fileDirectory)
             })
         }
+    }
+
+    override fun signature(index: Int, fileIndex: Int): ByteArray {
+        val dataReader = signatureDataReader(fileIndex)
         return dataReader.tableItemBytes(index)
     }
 
@@ -246,6 +270,26 @@ class IrPerFileLibraryImpl(_access: IrLibraryAccess<IrKotlinLibraryLayout>) : Ir
     override fun fileCount(): Int {
         return directories.size
     }
+
+    override fun types(fileIndex: Int): ByteArray {
+        TODO("Not yet implemented")
+    }
+
+    override fun signatures(fileIndex: Int): ByteArray {
+        TODO("Not yet implemented")
+    }
+
+    override fun strings(fileIndex: Int): ByteArray {
+        TODO("Not yet implemented")
+    }
+
+    override fun declarations(fileIndex: Int): ByteArray {
+        TODO("Not yet implemented")
+    }
+
+    override fun bodies(fileIndex: Int): ByteArray {
+        TODO("Not yet implemented")
+    }
 }
 
 open class KotlinLibraryImpl(