added buffer object

src/objects/o_buffer.c

@@ -0,0 +1,148 @@
+#include <assert.h>
+#include "../utils/defs.h"
+#include "objects.h"
+
+typedef struct {
+	Object         base;
+	int            size;
+	unsigned char *body;
+} BufferObject;
+
+static Object *select(Object *self, Object *key, Heap *heap, Error *err);
+static _Bool   insert(Object *self, Object *key, Object *val, Heap *heap, Error *err);
+static int     count(Object *self);
+static void	   print(Object *obj, FILE *fp);
+
+static const Type t_buffer = {
+	.base = (Object) { .type = &t_type, .flags = Object_STATIC },
+	.name = "buffer",
+	.size = sizeof (BufferObject),
+	.select = select,
+	.insert = insert,
+	.count = count,
+	.print = print,
+};
+
+Object *Object_NewBuffer(int size, Heap *heap, Error *error)
+{
+	assert(size >= 0);
+
+	// Make the thing.
+	BufferObject *obj;
+	{
+		obj = (BufferObject*) Heap_Malloc(heap, &t_buffer, error);
+
+		if(obj == NULL)
+			return NULL;
+
+		obj->size = size;
+		obj->body = Heap_RawMalloc(heap, sizeof(unsigned char) * size, error);
+
+		if(obj->body == NULL)
+			return NULL;
+	}
+
+	return (Object*) obj;
+}
+
+static Object *select(Object *self, Object *key, Heap *heap, Error *error)
+{
+	assert(self != NULL);
+	assert(self->type == &t_buffer);
+	assert(key != NULL);
+	assert(heap != NULL);
+	assert(error != NULL);
+
+	if(!Object_IsInt(key))
+		{
+			Error_Report(error, 0, "Non integer key");
+			return NULL;
+		}
+
+	int idx = Object_ToInt(key, error);
+	assert(error->occurred == 0);
+
+	BufferObject *buffer = (BufferObject*) self;
+
+	if(idx < 0 || idx >= buffer->size)
+		{
+			Error_Report(error, 0, "Out of range index");
+			return NULL;
+		}
+
+	unsigned char byte = buffer->body[idx];
+	
+	return Object_FromInt(byte, heap, error);
+}
+
+static _Bool insert(Object *self, Object *key, Object *val, Heap *heap, Error *error)
+{
+	assert(error != NULL);
+	assert(key != NULL);
+	assert(val != NULL);
+	assert(heap != NULL);
+	assert(self != NULL);
+	assert(self->type == &t_buffer);
+
+	BufferObject *buffer = (BufferObject*) self;
+
+	if(!Object_IsInt(key))
+		{
+			Error_Report(error, 0, "Non integer key");
+			return NULL;
+		}
+
+	int idx = Object_ToInt(key, error);
+	assert(error->occurred == 0);
+
+	if(idx < 0 || idx >= buffer->size)
+		{
+			Error_Report(error, 0, "Out of range index");
+			return NULL;
+		}
+
+	unsigned char byte = Object_ToInt(val, error);
+
+	if(error->occurred == 1)
+		return 0;
+
+	buffer->body[idx] = byte;
+	return 1;
+}
+
+static int count(Object *self)
+{
+	BufferObject *buffer = (BufferObject*) self;
+
+	return buffer->size;
+}
+
+static void print(Object *self, FILE *fp)
+{
+	BufferObject *buffer = (BufferObject*) self;
+
+	fprintf(fp, "[");
+
+	for(int i = 0; i < buffer->size; i += 1)
+		{
+			unsigned char byte, low, high;
+
+			byte = buffer->body[i];
+			low  = byte & 0xf;
+			high = byte >> 4;
+
+			assert(low  < 16);
+			assert(high < 16);
+
+			char c1, c2;
+
+			c1 = low  < 10 ? low  + '0' : low  - 10 + 'A';
+			c2 = high < 10 ? high + '0' : high - 10 + 'A';
+
+			fprintf(fp, "%c%c", c1, c2);
+
+			if(i+1 < buffer->size)
+				fprintf(fp, ", ");
+		}
+	fprintf(fp, "]");
+}