1 files changed, 124 insertions, 0 deletions
diff --git a/lib/libucsi/section_buf.h b/lib/libucsi/section_buf.h
new file mode 100644
index 0000000..52d2f84
--- /dev/null
+++ b/lib/libucsi/section_buf.h
@@ -0,0 +1,124 @@
+/*
+ * section and descriptor parser
+ *
+ * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef _UCSI_SECTION_BUF_H
+#define _UCSI_SECTION_BUF_H 1
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+
+#define DVB_MAX_SECTION_BYTES 4096
+
+/**
+ * Buffer used to keep track of  section fragments. You should allocate an
+ * area of memory of size (sizeof(section_buf) + <maxsectionsize>), and pass that area
+ * to section_buf_init() to set it up.
+ */
+struct section_buf {
+	uint32_t max;      /* maximum size of section - setup by section_buf_init() */
+	uint32_t count;    /* number of bytes currently accumulated */
+	uint32_t len;      /* total number of bytes expected in the complete section */
+	uint8_t header:1;  /* flag indicating the section header has been commpletely received */
+	uint8_t wait_pdu:1;/* flag indicating to wait till the next PDU start */
+	/* uint8_t data[] */
+};
+
+/**
+ * Initialise a section_buf structure.
+ *
+ * @param section The section_buf to initialise.
+ * @param max Maximum number of bytes in section (must be > 3)
+ * @return 0 on success, nonzero on error.
+ */
+extern int section_buf_init(struct section_buf *section, int max);
+
+/**
+ * Reset a section_buf structure (e.g. if a discontinuity occurred). The
+ * section_buf will wait for the first PDU start indicator.
+ *
+ * @param section The section_buf to reset.
+ */
+static inline void section_buf_reset(struct section_buf *section)
+{
+	int tmp = section->wait_pdu;
+	section_buf_init(section, section->max);
+	section->wait_pdu = tmp;
+}
+
+/**
+ * Add a data fragment to a section_buf.
+ *
+ * @param section section_buf to add to.
+ * @param frag Pointer to data fragment.
+ * @param len Number of bytes of data.
+ * @param section_status 0: nothing special. 1: section complete. -ERANGE indicates that the
+ * section is larger than section->max.
+ * @return Number of bytes which were consumed.
+ */
+extern int section_buf_add(struct section_buf *section, uint8_t* frag, int len, int *section_status);
+
+/**
+ * Add a transport packet PSI payload to a section_buf. This takes into account
+ * the extra byte present in PDU_START flagged packets.
+ *
+ * @param section section_buf to add to.
+ * @param payload Pointer to packet payload data.
+ * @param len Number of bytes of data.
+ * @param pdu_start True if the payload_unit_start_indicator flag was set in the
+ * TS packet.
+ * @param section_status 0: nothing special. 1: section complete. -ERANGE indicates that the
+ * section is larger than section->max. -EINVAL indicates the pointer_field was completely
+ * invalid (too large).
+ */
+extern int section_buf_add_transport_payload(struct section_buf *section,
+					     uint8_t* payload, int len,
+					     int pdu_start, int *section_status);
+
+/**
+ * Get the number of bytes left to be received in a section_buf.
+ *
+ * @param section The section_buf concerned.
+ * @return The number of bytes.
+ */
+static inline int section_buf_remaining(struct section_buf *section)
+{
+	return section->len - section->count;
+}
+
+/**
+ * Return a pointer to the start of the data in the section_buf.
+ *
+ * @param section The section_buf concerned.
+ * @return The data.
+ */
+static inline uint8_t* section_buf_data(struct section_buf *section)
+{
+	return (uint8_t*) section + sizeof(struct section_buf);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif