object: add generic byte-buffer data structure

object/buffer.c

@@ -0,0 +1,325 @@
+#include "buffer.h"
+
+#include <blue/core/iterator.h>
+#include <blue/object/buffer.h>
+#include <blue/object/type.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void buffer_release(struct b_object *obj);
+
+static struct b_object_type buffer_type = {
+	.t_flags = B_OBJECT_FUNDAMENTAL,
+	.t_id = B_OBJECT_TYPE_BUFFER,
+	.t_name = "corelib::buffer",
+	.t_instance_size = sizeof(struct b_buffer),
+	.t_release = buffer_release,
+};
+
+struct b_buffer *b_buffer_create(size_t item_sz)
+{
+	struct b_buffer *buffer
+		= (struct b_buffer *)b_object_type_instantiate(&buffer_type);
+	if (!buffer) {
+		return NULL;
+	}
+
+	buffer->buf_itemsz = item_sz;
+
+	return buffer;
+}
+
+struct b_buffer *b_buffer_create_from_bytes(const void *p, size_t len)
+{
+	struct b_buffer *buffer = b_buffer_create(1);
+	if (!buffer) {
+		return NULL;
+	}
+
+	buffer->buf_len = len;
+	buffer->buf_cap = len;
+	buffer->buf_itemsz = 1;
+	buffer->buf_data = calloc(len, 1);
+	if (!buffer->buf_data) {
+		b_buffer_release(buffer);
+		return NULL;
+	}
+
+	memcpy(buffer->buf_data, p, len);
+
+	return buffer;
+}
+
+struct b_buffer *b_buffer_create_from_array(const void *p, size_t item_sz, size_t len)
+{
+	struct b_buffer *buffer = b_buffer_create(1);
+	if (!buffer) {
+		return NULL;
+	}
+
+	buffer->buf_len = len;
+	buffer->buf_cap = len;
+	buffer->buf_itemsz = item_sz;
+	buffer->buf_data = calloc(len, item_sz);
+	if (!buffer->buf_data) {
+		b_buffer_release(buffer);
+		return NULL;
+	}
+
+	memcpy(buffer->buf_data, p, len * item_sz);
+
+	return buffer;
+}
+
+static b_status resize_buffer(struct b_buffer *buffer, size_t new_capacity)
+{
+	if (buffer->buf_cap < new_capacity) {
+		void *new_data = realloc(
+			buffer->buf_data, new_capacity * buffer->buf_itemsz);
+		if (!new_data) {
+			return B_ERR_NO_MEMORY;
+		}
+
+		buffer->buf_data = new_data;
+	} else {
+		void *new_data = realloc(
+			buffer->buf_data, new_capacity * buffer->buf_itemsz);
+		if (!new_data) {
+			return B_ERR_NO_MEMORY;
+		}
+
+		buffer->buf_data = new_data;
+	}
+
+	buffer->buf_cap = new_capacity;
+	if (buffer->buf_len > new_capacity) {
+		buffer->buf_len = new_capacity;
+	}
+
+	return B_SUCCESS;
+}
+
+void *b_buffer_steal(struct b_buffer *buf)
+{
+	void *p = buf->buf_data;
+
+	buf->buf_data = NULL;
+	buf->buf_len = 0;
+	buf->buf_cap = 0;
+
+	return p;
+}
+
+enum b_status b_buffer_reserve(struct b_buffer *buf, size_t capacity)
+{
+	if (buf->buf_cap >= capacity) {
+		return B_SUCCESS;
+	}
+
+	return resize_buffer(buf, capacity);
+}
+
+enum b_status b_buffer_resize(struct b_buffer *buf, size_t length)
+{
+	enum b_status status = resize_buffer(buf, length);
+
+	if (!B_OK(status)) {
+		return status;
+	}
+
+	buf->buf_len = length;
+	return B_SUCCESS;
+}
+
+enum b_status b_buffer_append(struct b_buffer *buffer, const void *p, size_t count)
+{
+	return b_buffer_insert(buffer, p, count, B_NPOS);
+}
+
+enum b_status b_buffer_prepend(struct b_buffer *buffer, const void *p, size_t count)
+{
+	return b_buffer_insert(buffer, p, count, 0);
+}
+
+enum b_status b_buffer_insert(
+	struct b_buffer *buffer, const void *p, size_t count, size_t at)
+{
+	if (at == B_NPOS) {
+		at = buffer->buf_len;
+	}
+
+	if (at > buffer->buf_len) {
+		return B_ERR_OUT_OF_BOUNDS;
+	}
+
+	b_status status = B_SUCCESS;
+
+	if (buffer->buf_len + count > buffer->buf_cap) {
+		status = resize_buffer(buffer, buffer->buf_cap + count);
+
+		if (status != B_SUCCESS) {
+			return status;
+		}
+	}
+
+	unsigned char *src
+		= (unsigned char *)buffer->buf_data + (at * buffer->buf_itemsz);
+	unsigned char *dest = src + (count * buffer->buf_itemsz);
+	size_t move_len = (buffer->buf_len - at) * buffer->buf_itemsz;
+
+	memmove(dest, src, move_len);
+	memcpy(src, p, count * buffer->buf_itemsz);
+
+	buffer->buf_len += count;
+	return B_SUCCESS;
+}
+
+enum b_status b_buffer_remove(struct b_buffer *buffer, size_t at, size_t count)
+{
+	if (at >= buffer->buf_len) {
+		return B_ERR_OUT_OF_BOUNDS;
+	}
+
+	if (at + count >= buffer->buf_len) {
+		count = buffer->buf_len - at;
+	}
+
+	unsigned char *dest = buffer->buf_data + (at * buffer->buf_itemsz);
+	unsigned char *src = dest + (count * buffer->buf_itemsz);
+	size_t move_len = (buffer->buf_len - at - count) * buffer->buf_itemsz;
+
+	memmove(dest, src, move_len);
+
+	buffer->buf_len -= count;
+
+	return B_SUCCESS;
+}
+
+void *b_buffer_ptr(const struct b_buffer *buffer)
+{
+	return buffer->buf_data;
+}
+
+void *b_buffer_get(const struct b_buffer *buffer, size_t at)
+{
+	if (at >= buffer->buf_len) {
+		return NULL;
+	}
+
+	return (unsigned char *)buffer->buf_data + (at * buffer->buf_itemsz);
+}
+
+size_t b_buffer_size(const struct b_buffer *buffer)
+{
+	return buffer->buf_len;
+}
+
+size_t b_buffer_capacity(const struct b_buffer *buffer)
+{
+	return buffer->buf_cap;
+}
+
+void buffer_release(struct b_object *obj)
+{
+	struct b_buffer *buffer = B_BUFFER(obj);
+
+	if (buffer->buf_data) {
+		free(buffer->buf_data);
+		buffer->buf_data = NULL;
+	}
+}
+
+enum b_status b_buffer_clear(struct b_buffer *buffer)
+{
+	buffer->buf_len = 0;
+	return B_SUCCESS;
+}
+
+enum b_status b_buffer_push_back(struct b_buffer *buf, size_t count, void **p)
+{
+	enum b_status status = B_SUCCESS;
+
+	if (buf->buf_len + count > buf->buf_cap) {
+		status = resize_buffer(buf, buf->buf_len + count);
+	}
+
+	if (!B_OK(status)) {
+		return status;
+	}
+
+	buf->buf_len += count;
+	*p = b_buffer_get(buf, buf->buf_len - count);
+
+	return B_SUCCESS;
+}
+
+enum b_status b_buffer_push_front(struct b_buffer *buf, size_t count, void **p)
+{
+	enum b_status status = B_SUCCESS;
+
+	if (buf->buf_len + count > buf->buf_cap) {
+		status = resize_buffer(buf, buf->buf_len + count);
+	}
+
+	if (!B_OK(status)) {
+		return status;
+	}
+
+	void *src = buf->buf_data;
+	void *dest = b_buffer_get(buf->buf_data, count);
+	size_t len = count * buf->buf_itemsz;
+
+	memmove(dest, src, len);
+	buf->buf_len += count;
+
+	*p = b_buffer_get(buf, 0);
+
+	return B_SUCCESS;
+}
+
+enum b_status b_buffer_pop_back(struct b_buffer *buf, size_t count)
+{
+	if (count > buf->buf_len) {
+		return B_ERR_OUT_OF_BOUNDS;
+	}
+
+	buf->buf_len -= count;
+
+	return B_SUCCESS;
+}
+
+enum b_status b_buffer_pop_front(struct b_buffer *buf, size_t count)
+{
+	if (count > buf->buf_len) {
+		return B_ERR_OUT_OF_BOUNDS;
+	}
+
+	void *src = b_buffer_get(buf->buf_data, count);
+	void *dest = buf->buf_data;
+	size_t len = (buf->buf_len - count) * buf->buf_itemsz;
+
+	memmove(dest, src, len);
+	buf->buf_len -= count;
+
+	return B_SUCCESS;
+}
+
+size_t b_buffer_get_size(const struct b_buffer *buf)
+{
+	return buf->buf_len;
+}
+
+size_t b_buffer_get_item_size(const struct b_buffer *buf)
+{
+	return buf->buf_itemsz;
+}
+
+size_t b_buffer_get_capacity(const struct b_buffer *buf)
+{
+	return buf->buf_cap;
+}
+
+b_object_type_id b_buffer_type_id(void)
+{
+	return (b_object_type_id)&buffer_type;
+}