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authorGeorge Kiagiadakis <george.kiagiadakis@collabora.com>2021-07-09 13:22:35 +0300
committerGeorge Kiagiadakis <george.kiagiadakis@collabora.com>2021-07-28 13:19:02 +0300
commitd61cc219f6bd3c4ffc96239893a8ded9b5a83b30 (patch)
tree4ac3c1b1ed0ede9b347e27b262f939213146a221 /lib/data.h
parenta2a3f6912e60c7932bad87a6d2249f0e83e637e1 (diff)
lib: remove dependency on spa_pod and spa in general
Replace spa_pod with a custom icipc_data structure, which is based on spa_pod and it's fully compatible with it Signed-off-by: George Kiagiadakis <george.kiagiadakis@collabora.com>
Diffstat (limited to 'lib/data.h')
-rw-r--r--lib/data.h209
1 files changed, 209 insertions, 0 deletions
diff --git a/lib/data.h b/lib/data.h
new file mode 100644
index 0000000..7072ba9
--- /dev/null
+++ b/lib/data.h
@@ -0,0 +1,209 @@
+/* PipeWire AGL Cluster IPC
+ *
+ * Copyright © 2018 Wim Taymans
+ * Copyright © 2021 Collabora Ltd.
+ * @author George Kiagiadakis <george.kiagiadakis@collabora.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+
+/* Trimmed down version of struct spa_pod from PipeWire's Simple Plugin API
+ * This aims to be compatible with spa_pod, so you can cast icipc_data
+ * to spa_pod and still be able to use it */
+
+struct icipc_data {
+ uint32_t size; /* size of the body */
+ uint32_t type; /* type of the body */
+ /* type-specific body follows */
+};
+
+#define ICIPC_DATA_BODY_SIZE(d) (((const struct icipc_data*)(d))->size)
+#define ICIPC_DATA_TYPE(d) (((const struct icipc_data*)(d))->type)
+#define ICIPC_DATA_SIZE(d) (sizeof(struct icipc_data) + ICIPC_DATA_BODY_SIZE(d))
+#define ICIPC_DATA_BODY(d) ((void*)(((uint8_t *) d) + sizeof(struct icipc_data)))
+#define ICIPC_DATA_BODY_CONST(d) ((const void*)(((const uint8_t *) d) + sizeof(struct icipc_data)))
+
+enum {
+ DATA_TYPE_NONE = 1, /* SPA_TYPE_None */
+ DATA_TYPE_ID = 3, /* SPA_TYPE_Id */
+ DATA_TYPE_INT = 4, /* SPA_TYPE_Int */
+ DATA_TYPE_STRING = 8, /* SPA_TYPE_String */
+ DATA_TYPE_STRUCT = 14, /* SPA_TYPE_Struct */
+};
+
+#define PTR_ALIGNMENT 8
+#define ROUND_UP_TO_ALIGN(num) (((num) + (PTR_ALIGNMENT - 1)) & ~((PTR_ALIGNMENT) - 1))
+#define PTR_IS_ALIGNED(p) (((intptr_t)(p) & (PTR_ALIGNMENT-1)) == 0)
+
+typedef struct DataBuilder {
+ union {
+ uint8_t *buffer;
+ struct icipc_data *data;
+ };
+ union {
+ uint8_t *ptr;
+ struct icipc_data *ptr_as_data;
+ };
+ size_t buf_size;
+} DataBuilder;
+
+typedef struct DataParser {
+ union {
+ const uint8_t *buffer;
+ const struct icipc_data *data;
+ };
+ union {
+ const uint8_t *ptr;
+ const struct icipc_data *ptr_as_data;
+ };
+ size_t buf_size;
+} DataParser;
+
+static inline void data_builder_init(
+ DataBuilder *b,
+ uint8_t *buffer,
+ size_t size) {
+ assert(size >= sizeof(struct icipc_data));
+ memset(buffer, 0, size);
+ b->buffer = buffer;
+ b->buf_size = size;
+ b->data->type = DATA_TYPE_STRUCT;
+ b->ptr = ICIPC_DATA_BODY(b->data);
+ assert(PTR_IS_ALIGNED(b->ptr));
+}
+
+static inline size_t data_type_id_calc_size(void) {
+ return sizeof(struct icipc_data) + ROUND_UP_TO_ALIGN(sizeof(uint32_t));
+}
+
+static inline void data_builder_push_id(DataBuilder *b, uint32_t id) {
+
+ const size_t body_size = ROUND_UP_TO_ALIGN(sizeof(uint32_t));
+ const size_t additional_size = sizeof(struct icipc_data) + body_size;
+ assert(b->buf_size >= ICIPC_DATA_SIZE(b->data) + additional_size);
+
+ b->ptr_as_data->size = body_size;
+ b->ptr_as_data->type = DATA_TYPE_ID;
+ *((uint32_t *) ICIPC_DATA_BODY(b->ptr)) = id;
+
+ b->data->size += additional_size;
+ b->ptr += additional_size;
+ assert(PTR_IS_ALIGNED(b->ptr));
+}
+
+static inline size_t data_type_string_calc_size(const char *str) {
+ size_t str_size = strlen(str) + 1;
+ return sizeof(struct icipc_data) + ROUND_UP_TO_ALIGN(str_size);
+}
+
+static inline void data_builder_push_string(DataBuilder *b, const char *str) {
+
+ size_t str_size = strlen(str) + 1;
+ const size_t body_size = ROUND_UP_TO_ALIGN(str_size);
+ const size_t additional_size = sizeof(struct icipc_data) + body_size;
+ assert(b->buf_size >= ICIPC_DATA_SIZE(b->data) + additional_size);
+
+ b->ptr_as_data->size = body_size;
+ b->ptr_as_data->type = DATA_TYPE_STRING;
+ strncpy((char *) ICIPC_DATA_BODY(b->ptr), str, str_size);
+
+ b->data->size += additional_size;
+ b->ptr += additional_size;
+ assert(PTR_IS_ALIGNED(b->ptr));
+}
+
+static inline size_t data_type_raw_calc_size(const struct icipc_data *raw) {
+ return sizeof(struct icipc_data) +
+ ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(raw));
+}
+
+static inline void data_builder_push_raw(
+ DataBuilder *b,
+ const struct icipc_data *raw) {
+
+ const size_t body_size = ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(raw));
+ const size_t additional_size = sizeof(struct icipc_data) + body_size;
+ assert(b->buf_size >= ICIPC_DATA_SIZE(b->data) + additional_size);
+
+ b->ptr_as_data->size = body_size;
+ b->ptr_as_data->type = raw->type;
+ memcpy(ICIPC_DATA_BODY(b->ptr),
+ ICIPC_DATA_BODY(raw),
+ ICIPC_DATA_BODY_SIZE(raw));
+
+ b->data->size += additional_size;
+ b->ptr += additional_size;
+ assert(PTR_IS_ALIGNED(b->ptr));
+}
+
+static inline bool data_parser_init(
+ DataParser *p,
+ const uint8_t *buffer,
+ size_t size) {
+ assert(size >= sizeof(struct icipc_data));
+ p->buffer = buffer;
+ p->buf_size = size;
+
+ if (p->data->type != DATA_TYPE_STRUCT ||
+ ICIPC_DATA_SIZE(p->data) > size)
+ return false;
+
+ p->ptr = ICIPC_DATA_BODY(p->data);
+ assert(PTR_IS_ALIGNED(p->ptr));
+ return true;
+}
+
+static inline bool data_parser_get_id(DataParser *p, uint32_t *id) {
+
+ if (p->ptr_as_data->type != DATA_TYPE_ID ||
+ ICIPC_DATA_BODY_SIZE(p->ptr) != ROUND_UP_TO_ALIGN(sizeof(uint32_t)))
+ return false;
+
+ *id = *((const uint32_t *) ICIPC_DATA_BODY_CONST(p->ptr));
+
+ p->ptr += ICIPC_DATA_SIZE(p->ptr);
+ assert(PTR_IS_ALIGNED(p->ptr));
+ return true;
+}
+
+static inline bool data_parser_get_string(DataParser *p, const char **str) {
+
+ if (p->ptr_as_data->type != DATA_TYPE_STRING ||
+ ICIPC_DATA_BODY_SIZE(p->ptr) == 0 ||
+ ICIPC_DATA_BODY_SIZE(p->ptr) !=
+ ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(p->ptr)) ||
+ (p->ptr - p->buffer) + ICIPC_DATA_SIZE(p->ptr) > p->buf_size)
+ return false;
+
+ *str = (const char *) ICIPC_DATA_BODY_CONST(p->ptr);
+
+ /* check that the string has a terminating null character */
+ if (strnlen(*str, ICIPC_DATA_BODY_SIZE(p->ptr)) ==
+ ICIPC_DATA_BODY_SIZE(p->ptr))
+ return false;
+
+ p->ptr += ICIPC_DATA_SIZE(p->ptr);
+ assert(PTR_IS_ALIGNED(p->ptr));
+ return true;
+}
+
+static inline bool data_parser_get_raw(
+ DataParser *p,
+ const struct icipc_data **raw) {
+ if (ICIPC_DATA_BODY_SIZE(p->ptr) !=
+ ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(p->ptr)) ||
+ (p->ptr - p->buffer) + ICIPC_DATA_SIZE(p->ptr) > p->buf_size)
+ return false;
+
+ *raw = p->ptr_as_data;
+
+ p->ptr += ICIPC_DATA_SIZE(p->ptr);
+ assert(PTR_IS_ALIGNED(p->ptr));
+ return true;
+}