silcbuffmt.h
- Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+ Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1997 - 2000 Pekka Riikonen
+ Copyright (C) 1997 - 2007 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
+ the Free Software Foundation; version 2 of the License.
+
This program 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
*/
+/****h* silcutil/SILC Buffer Format Interface
+ *
+ * DESCRIPTION
+ *
+ * SILC Buffer Format API provides functions for formatting different data
+ * types into a buffer and retrieving different data types from a buffer
+ * into specified data types. It is especially useful to encode packets,
+ * protocol payloads and such.
+ *
+ * As the SilcBuffer API is not thread-safe these routines may not be used
+ * in multithreaded environment with a same SilcBuffer context without
+ * concurrency control.
+ *
+ * EXAMPLE
+ *
+ * SilcBufferStruct buffer;
+ *
+ * memset(&buffer, 0, sizeof(buffer));
+ * ret = silc_buffer_format(&buffer,
+ * SILC_STR_UINT32(intval),
+ * SILC_STR_UINT8(charval),
+ * SILC_STR_UINT64(longintval),
+ * SILC_STR_UINT16(str_len),
+ * SILC_STR_DATA(str, str_len),
+ * SILC_STR_END);
+ * if (ret < 0)
+ * error;
+ *
+ ***/
+
#ifndef SILCBUFFMT_H
#define SILCBUFFMT_H
-/* Buffer parameter types.
-
- _SI_ = signed
- _UI_ = unsigned
-
-*/
-typedef enum {
- SILC_BUFFER_PARAM_SI8_CHAR,
- SILC_BUFFER_PARAM_UI8_CHAR,
-
- SILC_BUFFER_PARAM_SI16_SHORT,
- SILC_BUFFER_PARAM_UI16_SHORT,
-
- SILC_BUFFER_PARAM_SI32_INT,
- SILC_BUFFER_PARAM_UI32_INT,
-
- SILC_BUFFER_PARAM_UI16_STRING,
- SILC_BUFFER_PARAM_UI16_STRING_ALLOC,
- SILC_BUFFER_PARAM_UI32_STRING,
- SILC_BUFFER_PARAM_UI32_STRING_ALLOC,
- SILC_BUFFER_PARAM_UI16_NSTRING,
- SILC_BUFFER_PARAM_UI16_NSTRING_ALLOC,
- SILC_BUFFER_PARAM_UI32_NSTRING,
- SILC_BUFFER_PARAM_UI32_NSTRING_ALLOC,
- SILC_BUFFER_PARAM_UI_XNSTRING,
- SILC_BUFFER_PARAM_UI_XNSTRING_ALLOC,
-
- SILC_BUFFER_PARAM_END
-} SilcBufferParamType;
-
-/* Macros for expanding parameters into variable function argument list.
- These are passed to silc_buffer_format and silc_buffer_unformat
- functions. */
-
-/* One signed/unsigned character.
-
- Formatting: SILC_STR_SI_CHAR(char)
- SILC_STR_UI_CHAR(unsigned char)
- Unformatting: SILC_STR_SI_CHAR(char *)
- SILC_STR_UI_CHAR(unsigned char *)
-
-*/
-#define SILC_STR_SI_CHAR(x) SILC_BUFFER_PARAM_SI8_CHAR, (x)
-#define SILC_STR_UI_CHAR(x) SILC_BUFFER_PARAM_UI8_CHAR, (x)
-
-/* Signed/unsigned short.
-
- Formatting: SILC_STR_SI_SHORT(short)
- SILC_STR_UI_SHORT(unsigned short)
- Unformatting: SILC_STR_SI_SHORT(short *)
- SILC_STR_UI_SHORT(unsigned short *)
-
-*/
-#define SILC_STR_SI_SHORT(x) SILC_BUFFER_PARAM_SI16_SHORT, (x)
-#define SILC_STR_UI_SHORT(x) SILC_BUFFER_PARAM_UI16_SHORT, (x)
-
-/* Signed/unsigned int.
-
- Formatting: SILC_STR_SI_INT(int)
- SILC_STR_UI_INT(unsigned int)
- Unformatting: SILC_STR_SI_INT(int *)
- SILC_STR_UI_INT(unsigned int *)
-
-*/
-#define SILC_STR_SI_INT(x) SILC_BUFFER_PARAM_SI32_INT, (x)
-#define SILC_STR_UI_INT(x) SILC_BUFFER_PARAM_UI32_INT, (x)
-
-/* Unsigned NULL terminated string. Note that the string must be
- NULL terminated because strlen() will be used to get the length of
- the string.
-
- Formatting: SILC_STR_UI32_STRING(unsigned char *)
- Unformatting: SILC_STR_UI32_STRING(unsigned char **)
-
- Unformatting procedure will check for length of the string from the
- buffer before trying to get the string out. Thus, one *must* format the
- length as UI_INT or UI_SHORT into the buffer *before* formatting the
- actual string to the buffer, and, in unformatting one must ignore the
- length of the string because unformatting procedure will take it
- automatically.
-
- Example:
+/****f* silcutil/SilcBufferFormatAPI/SilcBufferFormatFunc
+ *
+ * SYNOPSIS
+ *
+ * typedef int (*SilcBuffeSFormatFunc)(SilcStack stack,
+ * SilcBuffer buffer,
+ * void *value,
+ * void *context);
+ *
+ * DESCRIPTION
+ *
+ * Formatting function callback given with SILC_STR_FUNC type. The
+ * `buffer' is the buffer being formatted at the location where the
+ * SILC_STR_FUNC was placed in formatting. The function should call
+ * silc_buffer_senlarge before it adds the data to the buffer to make
+ * sure that it has enough space. The buffer->head points to the
+ * start of the buffer and silc_buffer_headlen() gives the length
+ * of the currently formatted data area. It is also possible to use
+ * silc_buffer_sformat with `buffer' which will enlarge the buffer if
+ * needed.
+ *
+ * The `value' is the value given to SILC_STR_FUNC that is to be formatted
+ * into the buffer. It may be NULL if the function is not formatting
+ * new data into the buffer. The `context' is caller specific context.
+ * Returns -1 on error and length of the formatted value otherwise, and
+ * 0 if nothing was formatted.
+ *
+ ***/
+typedef int (*SilcBufferFormatFunc)(SilcStack stack, SilcBuffer buffer,
+ void *value, void *context);
+
+/****f* silcutil/SilcBufferFormatAPI/SilcBufferUnformatFunc
+ *
+ * SYNOPSIS
+ *
+ * typedef int (*SilcBufferUnformatFunc)(SilcBuffer buffer,
+ * void **value,
+ * void *context);
+ *
+ * DESCRIPTION
+ *
+ * Unformatting function callback given with SILC_STR_FUNC type. The
+ * `buffer' is the buffer being unformatted and is at the location where
+ * the SILC_STR_FUNC was placed in unformatting. The function should
+ * check there is enough data in the `buffer' before trying to decode
+ * from it.
+ *
+ * If this function unformats anything from the buffer its value is to
+ * be returned to the `value' pointer. The implementation should itself
+ * decide whether the unformatted value is allocated or not. If this
+ * function does not unformat anything, nothing is returned to `value'
+ *
+ * The `context' is caller specific context. Returns -1 on error, and
+ * length of the unformatted value otherwise, and 0 if nothing was
+ * unformatted.
+ *
+ ***/
+typedef int (*SilcBufferUnformatFunc)(SilcStack stack, SilcBuffer buffer,
+ void **value, void *context);
- Formatting: ..., SILC_STR_UI_INT(strlen(string)),
- SILC_STR_UI32_STRING(string), ...
- Unformatting: ..., SILC_STR_UI32_STRING(&string), ...
-
- I.e., you ignore the formatted length field in unformatting. If you don't
- the unformatting procedure might fail and it definitely does not unformat
- the data reliably.
-
- _ALLOC routines automatically allocates memory for the variable sent
- as argument in unformatting.
-
-*/
-#define SILC_STR_UI16_STRING(x) SILC_BUFFER_PARAM_UI16_STRING, (x)
-#define SILC_STR_UI16_STRING_ALLOC(x) SILC_BUFFER_PARAM_UI16_STRING_ALLOC, (x)
-#define SILC_STR_UI32_STRING(x) SILC_BUFFER_PARAM_UI32_STRING, (x)
-#define SILC_STR_UI32_STRING_ALLOC(x) SILC_BUFFER_PARAM_UI32_STRING_ALLOC, (x)
-
-/* Unsigned string. Second argument is the length of the string.
-
- Formatting: SILC_STR_UI32_NSTRING(unsigned char *, unsigned int)
- Unformatting: SILC_STR_UI32_NSTRING(unsigned char **, unsigned int *)
-
- Unformatting procedure will check for length of the string from the
- buffer before trying to get the string out. Thus, one *must* format the
- length as UI_INT or UI_SHORT into the buffer *before* formatting the
- actual string to the buffer, and, in unformatting one must ignore the
- length of the string because unformatting procedure will take it
- automatically.
-
- Example:
-
- Formatting: ..., SILC_STR_UI_INT(strlen(string)),
- SILC_STR_UI32_NSTRING(string, strlen(string)), ...
- Unformatting: ..., SILC_STR_UI32_NSTRING(&string, &len), ...
-
- I.e., you ignore the formatted length field in unformatting. If you don't
- the unformatting procedure might fail and it definitely does not unformat
- the data reliably. The length taken from the buffer is returned to the
- pointer sent as argument (&len in above example).
+/* Prototypes */
- UI/SI16 and UI/SI32 means that the length is considered to be either
- short (16 bits) or int (32 bits) in unformatting.
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_format
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_format(SilcBuffer dst, ...);
+ *
+ * DESCRIPTION
+ *
+ * Formats a buffer from a variable argument list. Returns -1 if the
+ * system is out of memory and the length of the formatted buffer otherwise.
+ * The buffer is enlarged automatically during formatting, if it doesn't
+ * already have enough space.
+ *
+ * EXAMPLE
+ *
+ * Three basic ways of using silc_buffer_format:
+ *
+ * // Statically allocated zero size buffer
+ * SilcBufferStruct buffer;
+ *
+ * memset(&buffer, 0, sizeof(buffer));
+ * ret = silc_buffer_format(&buffer,
+ * SILC_STR_UINT32(intval),
+ * SILC_STR_UINT8(charval),
+ * SILC_STR_UINT32(intval),
+ * SILC_STR_UINT16(str_len),
+ * SILC_STR_DATA(str, str_len),
+ * SILC_STR_END);
+ * if (ret < 0)
+ * error;
+ *
+ * // Free the allocated data
+ * silc_buffer_purge(&buffer);
+ *
+ * // Dynamically allocated zero size buffer
+ * SilcBuffer buf;
+ * buf = silc_buffer_alloc(0);
+ * ret = silc_buffer_format(buf,
+ * SILC_STR_UINT32(intval),
+ * SILC_STR_UINT8(charval),
+ * SILC_STR_END);
+ * if (ret < 0)
+ * error;
+ *
+ * // Free the allocated buffer
+ * silc_buffer_free(buf);
+ *
+ * // Dynamically allocated buffer with enough space
+ * SilcBuffer buf;
+ * buf = silc_buffer_alloc(2 + str_len);
+ * ret = silc_buffer_format(buf,
+ * SILC_STR_UINT16(str_len),
+ * SILC_STR_DATA(str, str_len),
+ * SILC_STR_END);
+ * if (ret < 0)
+ * error;
+ *
+ ***/
+int silc_buffer_format(SilcBuffer dst, ...);
- _ALLOC routines automatically allocates memory for the variable sent
- as argument in unformatting.
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_sformat
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_sformat(SilcStack stack, SilcBuffer dst, ...);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_buffer_format but uses `stack' to allocate the memory.
+ * if `stack' is NULL reverts back to silc_buffer_format call. Returns
+ * -1 if system is out of memory.
+ *
+ * Note that this call consumes the `stack'. The caller should push the
+ * stack before calling the function and pop it later.
+ *
+ ***/
+int silc_buffer_sformat(SilcStack stack, SilcBuffer dst, ...);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_format_vp
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_format_vp(SilcBuffer dst, va_list vp);
+ *
+ * DESCRIPTION
+ *
+ * Formats a buffer from a variable argument list indicated by the `ap'.
+ * Returns -1 if system is out of memory and the length of the formatted
+ * buffer otherwise.
+ *
+ ***/
+int silc_buffer_format_vp(SilcBuffer dst, va_list ap);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_sformat_vp
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_sformat_vp(SilcStack stack, SilcBuffer dst, va_list vp);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_buffer_format_vp but uses `stack' to allocate the memory.
+ * if `stack' is NULL reverts back to silc_buffer_format_vp call. Returns
+ * -1 if system is out of memory.
+ *
+ * Note that this call consumes the `stack'. The caller should push the
+ * stack before calling the function and pop it later.
+ *
+ ***/
+int silc_buffer_sformat_vp(SilcStack stack, SilcBuffer dst, va_list ap);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_unformat
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_unformat(SilcBuffer src, ...);
+ *
+ * DESCRIPTION
+ *
+ * Unformats a buffer from a variable argument list. Returns -1 on error
+ * and the length of the unformatted buffer otherwise.
+ *
+ * EXAMPLE
+ *
+ * ret = silc_buffer_unformat(buffer,
+ * SILC_STR_UINT32(&intval),
+ * SILC_STR_UINT8(&charval),
+ * SILC_STR_OFFSET(4),
+ * SILC_STR_UI16_NSTRING_ALLOC(&str, &str_len),
+ * SILC_STR_END);
+ * if (ret < 0)
+ * error;
+ *
+ ***/
+int silc_buffer_unformat(SilcBuffer src, ...);
-*/
-#define SILC_STR_UI16_NSTRING(x, l) SILC_BUFFER_PARAM_UI16_NSTRING, (x), (l)
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_sunformat
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_sunformat(SilcStack stack, SilcBuffer src, ...);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_buffer_unformat but uses `stack' to allocate the memory.
+ * if `stack' is NULL reverts back to silc_buffer_format call.
+ *
+ * Note that this call consumes the `stack'. The caller should push the
+ * stack before calling the function and pop it later.
+ *
+ ***/
+int silc_buffer_sunformat(SilcStack stack, SilcBuffer src, ...);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_unformat_vp
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_unformat_vp(SilcBuffer src, va_list vp);
+ *
+ * DESCRIPTION
+ *
+ * Unformats a buffer from a variable argument list indicated by the `ap'.
+ * Returns -1 on error and the length of the unformatted buffer otherwise.
+ *
+ ***/
+int silc_buffer_unformat_vp(SilcBuffer src, va_list ap);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_sunformat_vp
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_sunformat_vp(SilcBuffer src, va_list vp);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_buffer_unformat_vp but uses `stack' to allocate the
+ * memory. if `stack' is NULL reverts back to silc_buffer_format_vp call.
+ *
+ * Note that this call consumes the `stack'. The caller should push the
+ * stack before calling the function and pop it later.
+ *
+ ***/
+int silc_buffer_sunformat_vp(SilcStack stack, SilcBuffer src, va_list ap);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_strformat
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_strformat(SilcBuffer dst, ...);
+ *
+ * DESCRIPTION
+ *
+ * Formats a buffer from variable argument list of strings. Each
+ * string must be NULL-terminated and the variable argument list must
+ * be end with SILC_STRFMT_END argument. This allows that a string in
+ * the list can be NULL, in which case it is skipped. This automatically
+ * allocates the space for the buffer data but `dst' must be already
+ * allocated by the caller. Returns -1 if system is out of memory.
+ *
+ * EXAMPLE
+ *
+ * ret = silc_buffer_strformat(buffer, "foo", "bar", SILC_STRFMT_END);
+ * if (ret < 0)
+ * error;
+ *
+ ***/
+int silc_buffer_strformat(SilcBuffer dst, ...);
+
+/****f* silcutil/SilcBufferFormatAPI/silc_buffer_sstrformat
+ *
+ * SYNOPSIS
+ *
+ * int silc_buffer_strformat(SilcStack stack, SilcBuffer dst, ...);
+ *
+ * DESCRIPTION
+ *
+ * Formats a buffer from variable argument list of strings. Each
+ * string must be NULL-terminated and the variable argument list must
+ * be end with SILC_STRFMT_END argument. This allows that a string in
+ * the list can be NULL, in which case it is skipped. This automatically
+ * allocates the space for the buffer data but `dst' must be already
+ * allocated by the caller. This function is equivalent to
+ * silc_buffer_strformat but allocates memory from `stack'. Returns -1
+ * if system is out of memory.
+ *
+ * Note that this call consumes the `stack'. The caller should push the
+ * stack before calling the function and pop it later.
+ *
+ ***/
+int silc_buffer_sstrformat(SilcStack stack, SilcBuffer dst, ...);
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_SINT8
+ *
+ * NAME
+ *
+ * #define SILC_STR_SINT8() ...
+ *
+ * DESCRIPTION
+ *
+ * One 8-bit signed integer.
+ *
+ * Formatting: SILC_STR_SINT8(SilcInt8)
+ * Unformatting: SILC_STR_SINT8(SilcInt8 *)
+ *
+ ***/
+#define SILC_STR_SINT8(x) SILC_PARAM_SINT8, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_UINT8
+ *
+ * NAME
+ *
+ * #define SILC_STR_UINT8() ...
+ *
+ * DESCRIPTION
+ *
+ * One 8-bit unsigned integer.
+ *
+ * Formatting: SILC_STR_UINT8(SilcUInt8)
+ * Unformatting: SILC_STR_UINT8(SilcUInt8 *)
+ *
+ ***/
+#define SILC_STR_UINT8(x) SILC_PARAM_UINT8, (x)
+
+/* Deprecated */
+#define SILC_STR_SI_CHAR(x) SILC_PARAM_SINT8, (x)
+#define SILC_STR_UI_CHAR(x) SILC_PARAM_UINT8, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_SINT16
+ *
+ * NAME
+ *
+ * #define SILC_STR_SINT16() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcInt16.
+ *
+ * Formatting: SILC_STR_SINT16(SilcInt16)
+ * Unformatting: SILC_STR_SINT16(SilcInt16 *)
+ *
+ ***/
+#define SILC_STR_SINT16(x) SILC_PARAM_SINT16, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_UINT16
+ *
+ * NAME
+ *
+ * #define SILC_STR_UINT16() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcUInt16.
+ *
+ * Formatting: SILC_STR_UINT16(SilcUInt16)
+ * Unformatting: SILC_STR_UINT16(SilcUInt16 *)
+ *
+ ***/
+#define SILC_STR_UINT16(x) SILC_PARAM_UINT16, (x)
+
+/* Deprecated */
+#define SILC_STR_SI_SHORT(x) SILC_PARAM_SINT16, (x)
+#define SILC_STR_UI_SHORT(x) SILC_PARAM_UINT16, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_SINT32
+ *
+ * NAME
+ *
+ * #define SILC_STR_SINT32() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcInt32.
+ *
+ * Formatting: SILC_STR_SINT32(SilcInt32)
+ * Unformatting: SILC_STR_SINT32(SilcInt32 *)
+ *
+ ***/
+#define SILC_STR_SINT32(x) SILC_PARAM_SINT32, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_UINT32
+ *
+ * NAME
+ *
+ * #define SILC_STR_UINT32() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcUInt32.
+ *
+ * Formatting: SILC_STR_UINT32(SilcUInt32)
+ * Unformatting: SILC_STR_UINT32(SilcUInt32 *)
+ *
+ ***/
+#define SILC_STR_UINT32(x) SILC_PARAM_UINT32, (x)
+
+/* Deprecated */
+#define SILC_STR_SI_INT(x) SILC_PARAM_SINT32, (x)
+#define SILC_STR_UI_INT(x) SILC_PARAM_UINT32, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_SINT64
+ *
+ * NAME
+ *
+ * #define SILC_STR_SINT64() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcInt64.
+ *
+ * Formatting: SILC_STR_SINT64(SilcInt64)
+ * Unformatting: SILC_STR_SINT64(SilcInt64 *)
+ *
+ ***/
+#define SILC_STR_SI_INT64(x) SILC_PARAM_SINT64, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_UINT64
+ *
+ * NAME
+ *
+ * #define SILC_STR_UINT64() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcUInt64.
+ *
+ * Formatting: SILC_STR_UINT64(SilcUInt64)
+ * Unformatting: SILC_STR_UINT64(SilcUInt64 *)
+ *
+ ***/
+#define SILC_STR_UI_INT64(x) SILC_PARAM_UINT64, (x)
+
+/* Deprecated */
+#define SILC_STR_SI_INT64(x) SILC_PARAM_SINT64, (x)
+#define SILC_STR_UI_INT64(x) SILC_PARAM_UINT64, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_STRING
+ *
+ * NAME
+ *
+ * #define SILC_STR_UI8_STRING() ...
+ * #define SILC_STR_UI8_STRING_ALLOC() ...
+ * #define SILC_STR_UI16_STRING() ...
+ * #define SILC_STR_UI16_STRING_ALLOC() ...
+ * #define SILC_STR_UI32_STRING() ...
+ * #define SILC_STR_UI32_STRING_ALLOC() ...
+ *
+ * DESCRIPTION
+ *
+ * Unsigned NULL terminated string. Note that the string must be
+ * NULL terminated because strlen() will be used to get the length of
+ * the string.
+ *
+ * Formatting: SILC_STR_UI32_STRING(unsigned char *)
+ * Unformatting: SILC_STR_UI32_STRING(unsigned char **)
+ *
+ * Unformatting procedure will check for length of the string from the
+ * buffer before trying to get the string out. Thus, one *must* format the
+ * length as UI_INT or UI_SHORT into the buffer *before* formatting the
+ * actual string to the buffer, and, in unformatting one must ignore the
+ * length of the string because unformatting procedure will take it
+ * automatically.
+ *
+ * Example:
+ *
+ * Formatting: ..., SILC_STR_UI_INT(strlen(string)),
+ * SILC_STR_UI32_STRING(string), ...
+ * Unformatting: ..., SILC_STR_UI32_STRING(&string), ...
+ *
+ * I.e., you can ignore the formatted length field in unformatting.
+ *
+ * UI8, UI16 and UI32 means that the length is considered to be
+ * either char (8 bits), short (16 bits) or int (32 bits) in
+ * unformatting.
+ *
+ * _ALLOC routines automatically allocates memory for the variable sent
+ * as argument in unformatting.
+ *
+ ***/
+#define SILC_STR_UI8_STRING(x) SILC_PARAM_UI8_STRING, (x)
+#define SILC_STR_UI8_STRING_ALLOC(x) SILC_PARAM_UI8_STRING | SILC_PARAM_ALLOC, (x)
+#define SILC_STR_UI16_STRING(x) SILC_PARAM_UI16_STRING, (x)
+#define SILC_STR_UI16_STRING_ALLOC(x) SILC_PARAM_UI16_STRING | SILC_PARAM_ALLOC, (x)
+#define SILC_STR_UI32_STRING(x) SILC_PARAM_UI32_STRING, (x)
+#define SILC_STR_UI32_STRING_ALLOC(x) SILC_PARAM_UI32_STRING | SILC_PARAM_ALLOC, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_*_NSTRING
+ *
+ * NAME
+ *
+ * #define SILC_STR_UI8_NSTRING() ...
+ * #define SILC_STR_UI8_NSTRING_ALLOC() ...
+ * #define SILC_STR_UI16_NSTRING() ...
+ * #define SILC_STR_UI16_NSTRING_ALLOC() ...
+ * #define SILC_STR_UI32_NSTRING() ...
+ * #define SILC_STR_UI32_NSTRING_ALLOC() ...
+ *
+ * DESCRIPTION
+ *
+ * Unsigned string. Second argument is the length of the string.
+ *
+ * Formatting: SILC_STR_UI32_NSTRING(unsigned char *, SilcUInt32)
+ * Unformatting: SILC_STR_UI32_NSTRING(unsigned char **, SilcUInt32 *)
+ *
+ * Unformatting procedure will check for length of the string from the
+ * buffer before trying to get the string out. Thus, one *must* format the
+ * length as UI_INT or UI_SHORT into the buffer *before* formatting the
+ * actual string to the buffer, and, in unformatting one must ignore the
+ * length of the string because unformatting procedure will take it
+ * automatically.
+ *
+ * Example:
+ *
+ * Formatting: ..., SILC_STR_UI_INT(strlen(string)),
+ * SILC_STR_UI32_NSTRING(string, strlen(string)), ...
+ * Unformatting: ..., SILC_STR_UI32_NSTRING(&string, &len), ...
+ *
+ * I.e., you can ignore the formatted length field in unformatting. The
+ * length taken from the buffer is returned to the pointer sent as
+ * argument (&len in above example).
+ *
+ * UI8, UI16 and UI32 means that the length is considered to be
+ * either char (8 bits), short (16 bits) or int (32 bits) in
+ * unformatting.
+ *
+ * _ALLOC routines automatically allocates memory for the variable sent
+ * as argument in unformatting.
+ *
+ ***/
+#define SILC_STR_UI8_NSTRING(x, l) SILC_PARAM_UI8_NSTRING, (x), (l)
+#define SILC_STR_UI8_NSTRING_ALLOC(x, l) \
+ SILC_PARAM_UI8_NSTRING | SILC_PARAM_ALLOC, (x), (l)
+#define SILC_STR_UI16_NSTRING(x, l) SILC_PARAM_UI16_NSTRING, (x), (l)
#define SILC_STR_UI16_NSTRING_ALLOC(x, l) \
- SILC_BUFFER_PARAM_UI16_NSTRING_ALLOC, (x), (l)
-#define SILC_STR_UI32_NSTRING(x, l) SILC_BUFFER_PARAM_UI32_NSTRING, (x), (l)
+ SILC_PARAM_UI16_NSTRING | SILC_PARAM_ALLOC, (x), (l)
+#define SILC_STR_UI32_NSTRING(x, l) SILC_PARAM_UI32_NSTRING, (x), (l)
#define SILC_STR_UI32_NSTRING_ALLOC(x, l) \
- SILC_BUFFER_PARAM_UI32_NSTRING_ALLOC, (x), (l)
-
-/* Extended Unsigned string formatting. Second argument is the length of
- the string.
-
- Formatting: This is equal to using *_NSTRING
- Unformatting: SILC_STR_UI_XNSTRING(unsigned char **, unsigned int)
-
- This type can be used to take arbitrary length string from the buffer
- by sending the requested amount of bytes as argument. This differs
- from *_STRING and *_NSTRING so that this doesn't try to find the
- length of the data from the buffer but the length of the data is
- sent as argument. This a handy way to unformat fixed length strings
- from the buffer without having the length of the string formatted
- in the buffer.
-
- _ALLOC routines automatically allocates memory for the variable sent
- as argument in unformatting.
-
-*/
-#define SILC_STR_UI_XNSTRING(x, l) SILC_BUFFER_PARAM_UI_XNSTRING, (x), (l)
-#define SILC_STR_UI_XNSTRING_ALLOC(x, l) \
- SILC_BUFFER_PARAM_UI_XNSTRING_ALLOC, (x), (l)
-
-/* Marks end of the argument list. This must be at the end of the
- argument list or error will occur. */
-#define SILC_STR_END SILC_BUFFER_PARAM_END
-
-/* Prototypes */
-int silc_buffer_format(SilcBuffer dst, ...);
-int silc_buffer_unformat(SilcBuffer src, ...);
-
-#endif
+ SILC_PARAM_UI32_NSTRING | SILC_PARAM_ALLOC, (x), (l)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_DATA
+ *
+ * NAME
+ *
+ * #define SILC_STR_DATA() ...
+ * #define SILC_STR_DATA_ALLOC() ...
+ *
+ * DESCRIPTION
+ *
+ * Binary data formatting. Second argument is the length of the data.
+ *
+ * Formatting: SILC_STR_DATA(unsigned char *, SilcUInt32)
+ * Unformatting: SILC_STR_DATA(unsigned char **, SilcUInt32)
+ *
+ * This type can be used to take arbitrary size data block from the buffer
+ * by sending the requested amount of bytes as argument.
+ *
+ * _ALLOC routines automatically allocates memory for the variable sent
+ * as argument in unformatting.
+ *
+ ***/
+#define SILC_STR_DATA(x, l) SILC_PARAM_UICHAR, (x), (l)
+#define SILC_STR_DATA_ALLOC(x, l) SILC_PARAM_UICHAR | SILC_PARAM_ALLOC, (x), (l)
+
+/* Deprecated */
+#define SILC_STR_UI_XNSTRING(x, l) SILC_PARAM_UICHAR, (x), (l)
+#define SILC_STR_UI_XNSTRING_ALLOC(x, l) SILC_PARAM_UICHAR | SILC_PARAM_ALLOC, (x), (l)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_BUFFER
+ *
+ * NAME
+ *
+ * #define SILC_STR_BUFFER() ...
+ * #define SILC_STR_BUFFER_ALLOC() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcBuffer formatting.
+ *
+ * Formatting: SILC_STR_BUFFER(SilcBuffer)
+ * Unformatting: SILC_STR_BUFFER(SilcBuffer)
+ *
+ * This type can be used to format and unformat SilcBuffer. Note that, the
+ * length of the buffer will be automatically encoded into the buffer as
+ * a 32-bit integer. In unformatting the SilcBuffer context must be
+ * pre-allocated.
+ *
+ * _ALLOC routines automatically allocates memory inside SilcBuffer in
+ * unformatting.
+ *
+ ***/
+#define SILC_STR_BUFFER(x) SILC_PARAM_BUFFER, (x)
+#define SILC_STR_BUFFER_ALLOC(x) SILC_PARAM_BUFFER | SILC_PARAM_ALLOC, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_FUNC
+ *
+ * NAME
+ *
+ * #define SILC_STR_FUNC() ...
+ *
+ * DESCRIPTION
+ *
+ * SilcBuffer formatting.
+ *
+ * Formatting: SILC_STR_FUNC(function, void *value, void *context)
+ * Unformatting: SILC_STR_FUNC(function, void **value, void *context)
+ *
+ * This type can be used to call the `function' of the type
+ * SilcBufferFormatFunc or SilcBufferUnformatFunc to encode or decode
+ * the `value'. In encoding the `value' will be passed to the `function'
+ * and can be encoded into the buffer. The buffer will be passed as
+ * well to the `function' at the location where SILC_STR_FUNC is placed
+ * in formatting. The `context' delivers caller specific context to
+ * the `function'
+ *
+ * In unformatting the `function' will decode the encoded type and
+ * return it to `value' pointer. The decoding function should decide
+ * itself whether to allocate or not the decoded value.
+ *
+ * The `function' does not have to encode anything and passing `value'
+ * as NULL is allowed. The `function' could for example modify the
+ * existing buffer.
+ *
+ * EXAMPLE
+ *
+ * // Encode payload, encrypt and compute MAC.
+ * silc_buffer_format(buf,
+ * SILC_STR_FUNC(foo_encode_id, id, ctx),
+ * SILC_STR_UINT16(len),
+ * SILC_STR_DATA(data, len),
+ * SILC_STR_FUNC(foo_buf_encrypt, NULL, key),
+ * SILC_STR_FUNC(foo_buf_hmac, NULL, hmac),
+ * SILC_STR_DATA(iv, iv_len);
+ * SILC_STR_END);
+ *
+ * // Check MAC, decrypt and decode payload
+ * silc_buffer_unformat(buf,
+ * SILC_STR_FUNC(foo_buf_hmac, NULL, hmac),
+ * SILC_STR_FUNC(foo_buf_decrypt, NULL, key),
+ * SILC_STR_FUNC(foo_decode_id, &id, ctx),
+ * SILC_STR_UINT16(&len),
+ * SILC_STR_END);
+ *
+ ***/
+#define SILC_STR_FUNC(func, val, context) SILC_PARAM_FUNC, \
+ func, (val), (context)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_OFFSET
+ *
+ * NAME
+ *
+ * #define SILC_STR_OFFSET() ...
+ *
+ * DESCRIPTION
+ *
+ * Offset in buffer. This can be used in formatting and unformatting to
+ * move the data pointer of the buffer either forwards (positive offset)
+ * or backwards (negative offset). It can be used to for example skip
+ * some types during unformatting.
+ *
+ * Example:
+ *
+ * ..., SILC_STR_OFFSET(5), ...
+ * ..., SILC_STR_OFFSET(-3), ...
+ *
+ * Moves the data pointer at the point of the offset either forward
+ * or backward and then moves to the next type. Multiple SILC_STR_OFFSETs
+ * can be used in formatting and unformatting at the same time.
+ *
+ ***/
+#define SILC_STR_OFFSET(x) SILC_PARAM_OFFSET, (x)
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_ADVANCE
+ *
+ * NAME
+ *
+ * #define SILC_STR_ADVANCE ...
+ *
+ * DESCRIPTION
+ *
+ * Advance the buffer to the end of the data after the formatting is
+ * done. In normal operation when the formatted data is written the
+ * buffer is positioned at the start of the data. With SILC_STR_ADVANCE
+ * the buffer will be positioned at the end of the data. This makes it
+ * easy to add new data immediately after the previously added data.
+ * The SILC_STR_ADVANCE may also be used in unformatting.
+ *
+ * EXAMPLE
+ *
+ * do {
+ * len = read(fd, buf, sizeof(buf));
+ * if (len > 0)
+ * // Add read data to the buffer
+ * silc_buffer_format(buffer,
+ * SILC_STR_ADVANCE,
+ * SILC_STR_DATA(buf, len),
+ * SILC_STR_END);
+ * } while (len > 0);
+ *
+ * // Move to beginning of buffer
+ * silc_buffer_start(buffer);
+ *
+ ***/
+#define SILC_STR_ADVANCE SILC_PARAM_ADVANCE
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STR_END
+ *
+ * NAME
+ *
+ * #define SILC_STR_END ...
+ *
+ * DESCRIPTION
+ *
+ * Marks end of the argument list. This must be at the end of the
+ * argument list or error will occur.
+ *
+ ***/
+#define SILC_STR_END SILC_PARAM_END
+
+/****d* silcutil/SilcBufferFormatAPI/SILC_STRFMT_END
+ *
+ * NAME
+ *
+ * #define SILC_STRFMT_END ...
+ *
+ * DESCRIPTION
+ *
+ * Marks end of the argument list in silc_buffer_strformat function.
+ * This must be at the end of the argument list or error will occur.
+ *
+ ***/
+#define SILC_STRFMT_END (void *)SILC_STR_END
+
+#endif /* !SILCBUFFMT_H */
projects / silc.git / blobdiff