707 lines
18 KiB
C
707 lines
18 KiB
C
/*
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* buffer.h -- generic memory buffer.
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*
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* Copyright (c) 2005-2008, NLnet Labs. All rights reserved.
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*
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* See LICENSE for the license.
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*
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*
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* The buffer module implements a generic buffer. The API is based on
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* the java.nio.Buffer interface.
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*/
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#ifndef LDNS_SBUFFER_H
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#define LDNS_SBUFFER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef S_SPLINT_S
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# define INLINE
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#else
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# ifdef SWIG
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# define INLINE static
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# else
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# define INLINE static inline
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# endif
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#endif
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/*
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* Copy data allowing for unaligned accesses in network byte order
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* (big endian).
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*/
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INLINE uint16_t
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sldns_read_uint16(const void *src)
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{
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#ifdef ALLOW_UNALIGNED_ACCESSES
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return ntohs(*(const uint16_t *) src);
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#else
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const uint8_t *p = (const uint8_t *) src;
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return ((uint16_t) p[0] << 8) | (uint16_t) p[1];
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#endif
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}
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INLINE uint32_t
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sldns_read_uint32(const void *src)
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{
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#ifdef ALLOW_UNALIGNED_ACCESSES
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return ntohl(*(const uint32_t *) src);
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#else
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const uint8_t *p = (const uint8_t *) src;
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return ( ((uint32_t) p[0] << 24)
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| ((uint32_t) p[1] << 16)
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| ((uint32_t) p[2] << 8)
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| (uint32_t) p[3]);
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#endif
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}
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/*
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* Copy data allowing for unaligned accesses in network byte order
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* (big endian).
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*/
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INLINE void
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sldns_write_uint16(void *dst, uint16_t data)
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{
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#ifdef ALLOW_UNALIGNED_ACCESSES
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* (uint16_t *) dst = htons(data);
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#else
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uint8_t *p = (uint8_t *) dst;
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p[0] = (uint8_t) ((data >> 8) & 0xff);
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p[1] = (uint8_t) (data & 0xff);
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#endif
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}
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INLINE void
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sldns_write_uint32(void *dst, uint32_t data)
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{
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#ifdef ALLOW_UNALIGNED_ACCESSES
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* (uint32_t *) dst = htonl(data);
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#else
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uint8_t *p = (uint8_t *) dst;
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p[0] = (uint8_t) ((data >> 24) & 0xff);
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p[1] = (uint8_t) ((data >> 16) & 0xff);
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p[2] = (uint8_t) ((data >> 8) & 0xff);
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p[3] = (uint8_t) (data & 0xff);
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#endif
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}
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/**
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* \file sbuffer.h
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*
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* This file contains the definition of sldns_buffer, and functions to manipulate those.
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*/
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/**
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* implementation of buffers to ease operations
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*
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* sldns_buffers can contain arbitrary information, per octet. You can write
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* to the current end of a buffer, read from the current position, and
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* access any data within it.
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*/
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struct sldns_buffer
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{
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/** The current position used for reading/writing */
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size_t _position;
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/** The read/write limit */
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size_t _limit;
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/** The amount of data the buffer can contain */
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size_t _capacity;
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/** The data contained in the buffer */
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uint8_t *_data;
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/** If the buffer is fixed it cannot be resized */
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unsigned _fixed : 1;
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/** The current state of the buffer. If writing to the buffer fails
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* for any reason, this value is changed. This way, you can perform
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* multiple writes in sequence and check for success afterwards. */
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unsigned _status_err : 1;
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};
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typedef struct sldns_buffer sldns_buffer;
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#ifdef NDEBUG
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INLINE void
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sldns_buffer_invariant(sldns_buffer *ATTR_UNUSED(buffer))
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{
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}
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#else
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INLINE void
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sldns_buffer_invariant(sldns_buffer *buffer)
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{
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assert(buffer != NULL);
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assert(buffer->_position <= buffer->_limit);
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assert(buffer->_limit <= buffer->_capacity);
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assert(buffer->_data != NULL);
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}
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#endif
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/**
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* creates a new buffer with the specified capacity.
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*
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* \param[in] capacity the size (in bytes) to allocate for the buffer
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* \return the created buffer
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*/
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sldns_buffer *sldns_buffer_new(size_t capacity);
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/**
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* creates a buffer with the specified data. The data IS copied
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* and MEMORY allocations are done. The buffer is not fixed and can
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* be resized using buffer_reserve().
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*
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* \param[in] buffer pointer to the buffer to put the data in
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* \param[in] data the data to encapsulate in the buffer
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* \param[in] size the size of the data
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*/
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void sldns_buffer_new_frm_data(sldns_buffer *buffer, void *data, size_t size);
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/**
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* Setup a buffer with the data pointed to. No data copied, no memory allocs.
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* The buffer is fixed.
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* \param[in] buffer pointer to the buffer to put the data in
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* \param[in] data the data to encapsulate in the buffer
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* \param[in] size the size of the data
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*/
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void sldns_buffer_init_frm_data(sldns_buffer *buffer, void *data, size_t size);
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/**
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* clears the buffer and make it ready for writing. The buffer's limit
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* is set to the capacity and the position is set to 0.
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* \param[in] buffer the buffer to clear
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*/
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INLINE void sldns_buffer_clear(sldns_buffer *buffer)
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{
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sldns_buffer_invariant(buffer);
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/* reset status here? */
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buffer->_position = 0;
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buffer->_limit = buffer->_capacity;
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}
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/**
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* makes the buffer ready for reading the data that has been written to
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* the buffer. The buffer's limit is set to the current position and
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* the position is set to 0.
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*
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* \param[in] buffer the buffer to flip
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* \return void
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*/
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INLINE void sldns_buffer_flip(sldns_buffer *buffer)
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{
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sldns_buffer_invariant(buffer);
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buffer->_limit = buffer->_position;
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buffer->_position = 0;
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}
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/**
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* make the buffer ready for re-reading the data. The buffer's
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* position is reset to 0.
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* \param[in] buffer the buffer to rewind
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*/
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INLINE void sldns_buffer_rewind(sldns_buffer *buffer)
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{
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sldns_buffer_invariant(buffer);
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buffer->_position = 0;
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}
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/**
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* returns the current position in the buffer (as a number of bytes)
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* \param[in] buffer the buffer
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* \return the current position
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*/
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INLINE size_t
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sldns_buffer_position(sldns_buffer *buffer)
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{
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return buffer->_position;
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}
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/**
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* sets the buffer's position to MARK. The position must be less than
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* or equal to the buffer's limit.
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* \param[in] buffer the buffer
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* \param[in] mark the mark to use
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*/
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INLINE void
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sldns_buffer_set_position(sldns_buffer *buffer, size_t mark)
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{
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assert(mark <= buffer->_limit);
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buffer->_position = mark;
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}
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/**
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* changes the buffer's position by COUNT bytes. The position must not
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* be moved behind the buffer's limit or before the beginning of the
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* buffer.
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* \param[in] buffer the buffer
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* \param[in] count the count to use
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*/
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INLINE void
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sldns_buffer_skip(sldns_buffer *buffer, ssize_t count)
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{
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assert(buffer->_position + count <= buffer->_limit);
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buffer->_position += count;
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}
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/**
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* returns the maximum size of the buffer
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* \param[in] buffer
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* \return the size
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*/
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INLINE size_t
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sldns_buffer_limit(sldns_buffer *buffer)
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{
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return buffer->_limit;
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}
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/**
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* changes the buffer's limit. If the buffer's position is greater
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* than the new limit the position is set to the limit.
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* \param[in] buffer the buffer
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* \param[in] limit the new limit
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*/
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INLINE void
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sldns_buffer_set_limit(sldns_buffer *buffer, size_t limit)
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{
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assert(limit <= buffer->_capacity);
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buffer->_limit = limit;
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if (buffer->_position > buffer->_limit)
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buffer->_position = buffer->_limit;
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}
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/**
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* returns the number of bytes the buffer can hold.
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* \param[in] buffer the buffer
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* \return the number of bytes
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*/
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INLINE size_t
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sldns_buffer_capacity(sldns_buffer *buffer)
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{
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return buffer->_capacity;
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}
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/**
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* changes the buffer's capacity. The data is reallocated so any
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* pointers to the data may become invalid. The buffer's limit is set
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* to the buffer's new capacity.
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* \param[in] buffer the buffer
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* \param[in] capacity the capacity to use
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* \return whether this failed or succeeded
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*/
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int sldns_buffer_set_capacity(sldns_buffer *buffer, size_t capacity);
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/**
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* ensures BUFFER can contain at least AMOUNT more bytes. The buffer's
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* capacity is increased if necessary using buffer_set_capacity().
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*
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* The buffer's limit is always set to the (possibly increased)
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* capacity.
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* \param[in] buffer the buffer
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* \param[in] amount amount to use
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* \return whether this failed or succeeded
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*/
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int sldns_buffer_reserve(sldns_buffer *buffer, size_t amount);
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/**
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* returns a pointer to the data at the indicated position.
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* \param[in] buffer the buffer
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* \param[in] at position
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* \return the pointer to the data
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*/
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INLINE uint8_t *
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sldns_buffer_at(const sldns_buffer *buffer, size_t at)
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{
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assert(at <= buffer->_limit);
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return buffer->_data + at;
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}
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/**
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* returns a pointer to the beginning of the buffer (the data at
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* position 0).
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* \param[in] buffer the buffer
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* \return the pointer
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*/
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INLINE uint8_t *
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sldns_buffer_begin(const sldns_buffer *buffer)
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{
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return sldns_buffer_at(buffer, 0);
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}
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/**
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* returns a pointer to the end of the buffer (the data at the buffer's
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* limit).
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* \param[in] buffer the buffer
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* \return the pointer
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*/
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INLINE uint8_t *
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sldns_buffer_end(sldns_buffer *buffer)
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{
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return sldns_buffer_at(buffer, buffer->_limit);
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}
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/**
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* returns a pointer to the data at the buffer's current position.
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* \param[in] buffer the buffer
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* \return the pointer
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*/
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INLINE uint8_t *
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sldns_buffer_current(sldns_buffer *buffer)
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{
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return sldns_buffer_at(buffer, buffer->_position);
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}
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/**
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* returns the number of bytes remaining between the indicated position and
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* the limit.
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* \param[in] buffer the buffer
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* \param[in] at indicated position
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* \return number of bytes
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*/
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INLINE size_t
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sldns_buffer_remaining_at(sldns_buffer *buffer, size_t at)
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{
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sldns_buffer_invariant(buffer);
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assert(at <= buffer->_limit);
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return buffer->_limit - at;
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}
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/**
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* returns the number of bytes remaining between the buffer's position and
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* limit.
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* \param[in] buffer the buffer
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* \return the number of bytes
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*/
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INLINE size_t
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sldns_buffer_remaining(sldns_buffer *buffer)
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{
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return sldns_buffer_remaining_at(buffer, buffer->_position);
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}
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/**
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* checks if the buffer has at least COUNT more bytes available.
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* Before reading or writing the caller needs to ensure enough space
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* is available!
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* \param[in] buffer the buffer
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* \param[in] at indicated position
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* \param[in] count how much is available
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* \return true or false (as int?)
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*/
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INLINE int
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sldns_buffer_available_at(sldns_buffer *buffer, size_t at, size_t count)
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{
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return count <= sldns_buffer_remaining_at(buffer, at);
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}
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/**
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* checks if the buffer has count bytes available at the current position
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* \param[in] buffer the buffer
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* \param[in] count how much is available
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* \return true or false (as int?)
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*/
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INLINE int
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sldns_buffer_available(sldns_buffer *buffer, size_t count)
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{
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return sldns_buffer_available_at(buffer, buffer->_position, count);
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}
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/**
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* writes the given data to the buffer at the specified position
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* \param[in] buffer the buffer
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* \param[in] at the position (in number of bytes) to write the data at
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* \param[in] data pointer to the data to write to the buffer
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* \param[in] count the number of bytes of data to write
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*/
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INLINE void
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sldns_buffer_write_at(sldns_buffer *buffer, size_t at, const void *data, size_t count)
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{
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assert(sldns_buffer_available_at(buffer, at, count));
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memcpy(buffer->_data + at, data, count);
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}
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/**
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* writes count bytes of data to the current position of the buffer
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* \param[in] buffer the buffer
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* \param[in] data the data to write
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* \param[in] count the lenght of the data to write
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*/
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INLINE void
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sldns_buffer_write(sldns_buffer *buffer, const void *data, size_t count)
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{
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sldns_buffer_write_at(buffer, buffer->_position, data, count);
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buffer->_position += count;
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}
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/**
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* copies the given (null-delimited) string to the specified position at the buffer
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* \param[in] buffer the buffer
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* \param[in] at the position in the buffer
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* \param[in] str the string to write
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*/
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INLINE void
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sldns_buffer_write_string_at(sldns_buffer *buffer, size_t at, const char *str)
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{
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sldns_buffer_write_at(buffer, at, str, strlen(str));
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}
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/**
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* copies the given (null-delimited) string to the current position at the buffer
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* \param[in] buffer the buffer
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* \param[in] str the string to write
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*/
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INLINE void
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sldns_buffer_write_string(sldns_buffer *buffer, const char *str)
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{
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sldns_buffer_write(buffer, str, strlen(str));
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}
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/**
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* writes the given byte of data at the given position in the buffer
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* \param[in] buffer the buffer
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* \param[in] at the position in the buffer
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* \param[in] data the 8 bits to write
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*/
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INLINE void
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sldns_buffer_write_u8_at(sldns_buffer *buffer, size_t at, uint8_t data)
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{
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assert(sldns_buffer_available_at(buffer, at, sizeof(data)));
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buffer->_data[at] = data;
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}
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/**
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* writes the given byte of data at the current position in the buffer
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* \param[in] buffer the buffer
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* \param[in] data the 8 bits to write
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*/
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INLINE void
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sldns_buffer_write_u8(sldns_buffer *buffer, uint8_t data)
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{
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sldns_buffer_write_u8_at(buffer, buffer->_position, data);
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buffer->_position += sizeof(data);
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}
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/**
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* writes the given 2 byte integer at the given position in the buffer
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* \param[in] buffer the buffer
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* \param[in] at the position in the buffer
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* \param[in] data the 16 bits to write
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*/
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INLINE void
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sldns_buffer_write_u16_at(sldns_buffer *buffer, size_t at, uint16_t data)
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{
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assert(sldns_buffer_available_at(buffer, at, sizeof(data)));
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sldns_write_uint16(buffer->_data + at, data);
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}
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/**
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* writes the given 2 byte integer at the current position in the buffer
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* \param[in] buffer the buffer
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* \param[in] data the 16 bits to write
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*/
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INLINE void
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sldns_buffer_write_u16(sldns_buffer *buffer, uint16_t data)
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{
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sldns_buffer_write_u16_at(buffer, buffer->_position, data);
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buffer->_position += sizeof(data);
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}
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/**
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* writes the given 4 byte integer at the given position in the buffer
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* \param[in] buffer the buffer
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* \param[in] at the position in the buffer
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* \param[in] data the 32 bits to write
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*/
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INLINE void
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sldns_buffer_write_u32_at(sldns_buffer *buffer, size_t at, uint32_t data)
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{
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assert(sldns_buffer_available_at(buffer, at, sizeof(data)));
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sldns_write_uint32(buffer->_data + at, data);
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}
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/**
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* writes the given 4 byte integer at the current position in the buffer
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* \param[in] buffer the buffer
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* \param[in] data the 32 bits to write
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*/
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INLINE void
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sldns_buffer_write_u32(sldns_buffer *buffer, uint32_t data)
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{
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sldns_buffer_write_u32_at(buffer, buffer->_position, data);
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buffer->_position += sizeof(data);
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}
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/**
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* copies count bytes of data at the given position to the given data-array
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* \param[in] buffer the buffer
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* \param[in] at the position in the buffer to start
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* \param[out] data buffer to copy to
|
|
* \param[in] count the length of the data to copy
|
|
*/
|
|
INLINE void
|
|
sldns_buffer_read_at(sldns_buffer *buffer, size_t at, void *data, size_t count)
|
|
{
|
|
assert(sldns_buffer_available_at(buffer, at, count));
|
|
memcpy(data, buffer->_data + at, count);
|
|
}
|
|
|
|
/**
|
|
* copies count bytes of data at the current position to the given data-array
|
|
* \param[in] buffer the buffer
|
|
* \param[out] data buffer to copy to
|
|
* \param[in] count the length of the data to copy
|
|
*/
|
|
INLINE void
|
|
sldns_buffer_read(sldns_buffer *buffer, void *data, size_t count)
|
|
{
|
|
sldns_buffer_read_at(buffer, buffer->_position, data, count);
|
|
buffer->_position += count;
|
|
}
|
|
|
|
/**
|
|
* returns the byte value at the given position in the buffer
|
|
* \param[in] buffer the buffer
|
|
* \param[in] at the position in the buffer
|
|
* \return 1 byte integer
|
|
*/
|
|
INLINE uint8_t
|
|
sldns_buffer_read_u8_at(sldns_buffer *buffer, size_t at)
|
|
{
|
|
assert(sldns_buffer_available_at(buffer, at, sizeof(uint8_t)));
|
|
return buffer->_data[at];
|
|
}
|
|
|
|
/**
|
|
* returns the byte value at the current position in the buffer
|
|
* \param[in] buffer the buffer
|
|
* \return 1 byte integer
|
|
*/
|
|
INLINE uint8_t
|
|
sldns_buffer_read_u8(sldns_buffer *buffer)
|
|
{
|
|
uint8_t result = sldns_buffer_read_u8_at(buffer, buffer->_position);
|
|
buffer->_position += sizeof(uint8_t);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* returns the 2-byte integer value at the given position in the buffer
|
|
* \param[in] buffer the buffer
|
|
* \param[in] at position in the buffer
|
|
* \return 2 byte integer
|
|
*/
|
|
INLINE uint16_t
|
|
sldns_buffer_read_u16_at(sldns_buffer *buffer, size_t at)
|
|
{
|
|
assert(sldns_buffer_available_at(buffer, at, sizeof(uint16_t)));
|
|
return sldns_read_uint16(buffer->_data + at);
|
|
}
|
|
|
|
/**
|
|
* returns the 2-byte integer value at the current position in the buffer
|
|
* \param[in] buffer the buffer
|
|
* \return 2 byte integer
|
|
*/
|
|
INLINE uint16_t
|
|
sldns_buffer_read_u16(sldns_buffer *buffer)
|
|
{
|
|
uint16_t result = sldns_buffer_read_u16_at(buffer, buffer->_position);
|
|
buffer->_position += sizeof(uint16_t);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* returns the 4-byte integer value at the given position in the buffer
|
|
* \param[in] buffer the buffer
|
|
* \param[in] at position in the buffer
|
|
* \return 4 byte integer
|
|
*/
|
|
INLINE uint32_t
|
|
sldns_buffer_read_u32_at(sldns_buffer *buffer, size_t at)
|
|
{
|
|
assert(sldns_buffer_available_at(buffer, at, sizeof(uint32_t)));
|
|
return sldns_read_uint32(buffer->_data + at);
|
|
}
|
|
|
|
/**
|
|
* returns the 4-byte integer value at the current position in the buffer
|
|
* \param[in] buffer the buffer
|
|
* \return 4 byte integer
|
|
*/
|
|
INLINE uint32_t
|
|
sldns_buffer_read_u32(sldns_buffer *buffer)
|
|
{
|
|
uint32_t result = sldns_buffer_read_u32_at(buffer, buffer->_position);
|
|
buffer->_position += sizeof(uint32_t);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* returns the status of the buffer
|
|
* \param[in] buffer
|
|
* \return the status
|
|
*/
|
|
INLINE int
|
|
sldns_buffer_status(sldns_buffer *buffer)
|
|
{
|
|
return (int)buffer->_status_err;
|
|
}
|
|
|
|
/**
|
|
* returns true if the status of the buffer is LDNS_STATUS_OK, false otherwise
|
|
* \param[in] buffer the buffer
|
|
* \return true or false
|
|
*/
|
|
INLINE int
|
|
sldns_buffer_status_ok(sldns_buffer *buffer)
|
|
{
|
|
if (buffer) {
|
|
return sldns_buffer_status(buffer) == 0;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* prints to the buffer, increasing the capacity if required using
|
|
* buffer_reserve(). The buffer's position is set to the terminating '\\0'
|
|
* Returns the number of characters written (not including the
|
|
* terminating '\\0') or -1 on failure.
|
|
*/
|
|
int sldns_buffer_printf(sldns_buffer *buffer, const char *format, ...)
|
|
ATTR_FORMAT(printf, 2, 3);
|
|
|
|
/**
|
|
* frees the buffer.
|
|
* \param[in] *buffer the buffer to be freed
|
|
* \return void
|
|
*/
|
|
void sldns_buffer_free(sldns_buffer *buffer);
|
|
|
|
/**
|
|
* Makes the buffer fixed and returns a pointer to the data. The
|
|
* caller is responsible for free'ing the result.
|
|
* \param[in] *buffer the buffer to be exported
|
|
* \return void
|
|
*/
|
|
void *sldns_buffer_export(sldns_buffer *buffer);
|
|
|
|
/**
|
|
* Copy contents of the from buffer to the result buffer and then flips
|
|
* the result buffer. Data will be silently truncated if the result buffer is
|
|
* too small.
|
|
* \param[out] *result resulting buffer which is copied to.
|
|
* \param[in] *from what to copy to result.
|
|
*/
|
|
void sldns_buffer_copy(sldns_buffer* result, sldns_buffer* from);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LDNS_SBUFFER_H */
|