Merge "Initial commit: cframework. Longbow and Libparc" into cframework/master

1 files changed, 185 insertions, 0 deletions

diff --git a/libparc/parc/algol/parc_RandomAccessFile.c b/libparc/parc/algol/parc_RandomAccessFile.c
new file mode 100755
index 00000000..65bff1d1
--- /dev/null
+++ b/libparc/parc/algol/parc_RandomAccessFile.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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.
+ */
+
+/**
+ */
+#include <config.h>
+
+#include <parc/algol/parc_Object.h>
+#include <parc/algol/parc_DisplayIndented.h>
+#include <parc/algol/parc_Memory.h>
+
+#include <parc/algol/parc_RandomAccessFile.h>
+
+#include <stdio.h>
+
+struct PARCRandomAccessFile {
+    char *fname;
+    FILE *fhandle;
+};
+
+static void
+_parcRandomAccessFile_Finalize(PARCRandomAccessFile **instancePtr)
+{
+    assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCRandomAccessFile pointer.");
+    PARCRandomAccessFile *instance = *instancePtr;
+    if (instance->fhandle != NULL) {
+        fclose(instance->fhandle);
+    }
+    if (instance->fname != NULL) {
+        parcMemory_Deallocate(&instance->fname);
+    }
+}
+
+parcObject_ImplementAcquire(parcRandomAccessFile, PARCRandomAccessFile);
+
+parcObject_ImplementRelease(parcRandomAccessFile, PARCRandomAccessFile);
+
+parcObject_ExtendPARCObject(PARCRandomAccessFile, _parcRandomAccessFile_Finalize, NULL,
+                            parcRandomAccessFile_ToString, parcRandomAccessFile_Equals, NULL,
+                            parcRandomAccessFile_HashCode, parcRandomAccessFile_ToJSON);
+
+
+void
+parcRandomAccessFile_AssertValid(const PARCRandomAccessFile *instance)
+{
+    assertTrue(parcRandomAccessFile_IsValid(instance),
+               "PARCRandomAccessFile is not valid.");
+}
+
+void
+parcRandomAccessFile_Display(const PARCRandomAccessFile *instance, int indentation)
+{
+    parcDisplayIndented_PrintLine(indentation, "PARCRandomAccessFile@%p {", instance);
+    parcDisplayIndented_PrintLine(indentation + 1, "File: %s", instance->fname);
+    parcDisplayIndented_PrintLine(indentation, "}");
+}
+
+PARCHashCode
+parcRandomAccessFile_HashCode(const PARCRandomAccessFile *instance)
+{
+    return parcHashCode_Hash((uint8_t *) instance->fname, strlen(instance->fname));
+}
+
+bool
+parcRandomAccessFile_Equals(const PARCRandomAccessFile *x, const PARCRandomAccessFile *y)
+{
+    bool result = false;
+
+    if (x == y) {
+        result = true;
+    } else if (x == NULL || y == NULL) {
+        result = false;
+    } else {
+        if (strcmp(x->fname, y->fname) == 0) {
+            result = true;
+        }
+    }
+
+    return result;
+}
+
+bool
+parcRandomAccessFile_IsValid(const PARCRandomAccessFile *instance)
+{
+    bool result = false;
+
+    if (instance != NULL) {
+        result = instance->fhandle != NULL;
+    }
+
+    return result;
+}
+
+PARCJSON *
+parcRandomAccessFile_ToJSON(const PARCRandomAccessFile *instance)
+{
+    PARCJSON *result = parcJSON_Create();
+
+    if (result != NULL) {
+        parcJSON_AddString(result, "fname", instance->fname);
+    }
+
+    return result;
+}
+
+char *
+parcRandomAccessFile_ToString(const PARCRandomAccessFile *instance)
+{
+    char *result = parcMemory_Format("PARCRandomAccessFile[%s]@%p\n", instance->fname, instance);
+    return result;
+}
+
+PARCRandomAccessFile *
+parcRandomAccessFile_Open(PARCFile *file)
+{
+    PARCRandomAccessFile *handle = parcObject_CreateAndClearInstance(PARCRandomAccessFile);
+    if (handle != NULL) {
+        char *fname = parcFile_ToString(file);
+        handle->fhandle = fopen(fname, "r+");
+        handle->fname = parcMemory_StringDuplicate(fname, strlen(fname));
+        parcMemory_Deallocate(&fname);
+    }
+    return handle;
+}
+
+bool
+parcRandomAccessFile_Close(PARCRandomAccessFile *fileHandle)
+{
+    assertNotNull(fileHandle->fhandle, "Can't fclose a null pointer. How did they get one anyway?");
+    bool result = fclose(fileHandle->fhandle) == 0;
+    fileHandle->fhandle = NULL;
+    parcMemory_Deallocate(&fileHandle->fname);
+    fileHandle->fname = NULL;
+    return result;
+}
+
+// read (count * size) bytes into the provided buffer, and return the number of bytes actually read
+size_t
+parcRandomAccessFile_Read(PARCRandomAccessFile *fileHandle, PARCBuffer *buffer)
+{
+    size_t length = parcBuffer_Remaining(buffer);
+    size_t numBytes = fread(parcBuffer_Overlay(buffer, length), 1, length, fileHandle->fhandle);
+    return numBytes;
+}
+
+// write (count * size) bytes from `buffer` to the file, and return the number of bytes actually written
+size_t
+parcRandomAccessFile_Write(PARCRandomAccessFile *fileHandle, PARCBuffer *buffer)
+{
+    size_t length = parcBuffer_Remaining(buffer);
+    size_t numBytes = fwrite(parcBuffer_Overlay(buffer, length), 1, length, fileHandle->fhandle);
+    return numBytes;
+}
+
+size_t
+parcRandomAccessFile_Seek(PARCRandomAccessFile *fileHandle, long offset, PARCRandomAccessFilePosition position)
+{
+    size_t result = 0;
+    switch (position) {
+        case PARCRandomAccessFilePosition_Start:
+            result = fseek(fileHandle->fhandle, offset, SEEK_SET); // beginning of the file
+            break;
+        case PARCRandomAccessFilePosition_Current:
+            result = fseek(fileHandle->fhandle, offset, SEEK_CUR); // current offset
+            break;
+        case PARCRandomAccessFilePosition_End:
+            result = fseek(fileHandle->fhandle, offset, SEEK_END); // end of the file
+            break;
+        default:
+            assertTrue(false, "Invalid position %d", position);
+    }
+    return result;
+}