mirror of
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569 lines
22 KiB
C
569 lines
22 KiB
C
/****************************************************************************
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**
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** Copyright (C) 2018 Intel Corporation
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**
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** Permission is hereby granted, free of charge, to any person obtaining a copy
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** of this software and associated documentation files (the "Software"), to deal
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** in the Software without restriction, including without limitation the rights
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** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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** copies of the Software, and to permit persons to whom the Software is
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** furnished to do so, subject to the following conditions:
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**
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** The above copyright notice and this permission notice shall be included in
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** all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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** THE SOFTWARE.
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**
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****************************************************************************/
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#define _BSD_SOURCE 1
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#define _DEFAULT_SOURCE 1
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#ifndef __STDC_LIMIT_MACROS
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# define __STDC_LIMIT_MACROS 1
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#endif
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#include "cbor.h"
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#include "cborinternal_p.h"
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#include "compilersupport_p.h"
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#include "utf8_p.h"
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#include <inttypes.h>
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#include <string.h>
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/**
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* \defgroup CborPretty Converting CBOR to text
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* \brief Group of functions used to convert CBOR to text form.
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*
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* This group contains two functions that can be used to convert a \ref
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* CborValue object to a text representation. This module attempts to follow
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* the recommendations from RFC 7049 section 6 "Diagnostic Notation", though it
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* has a few differences. They are noted below.
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*
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* TinyCBOR does not provide a way to convert from the text representation back
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* to encoded form. To produce a text form meant to be parsed, CborToJson is
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* recommended instead.
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*
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* Either of the functions in this section will attempt to convert exactly one
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* CborValue object to text. Those functions may return any error documented
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* for the functions for CborParsing. In addition, if the C standard library
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* stream functions return with error, the text conversion will return with
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* error CborErrorIO.
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*
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* These functions also perform UTF-8 validation in CBOR text strings. If they
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* encounter a sequence of bytes that is not permitted in UTF-8, they will return
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* CborErrorInvalidUtf8TextString. That includes encoding of surrogate points
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* in UTF-8.
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*
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* \warning The output type produced by these functions is not guaranteed to
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* remain stable. A future update of TinyCBOR may produce different output for
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* the same input and parsers may be unable to handle it.
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*
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* \sa CborParsing, CborToJson, cbor_parser_init()
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*/
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/**
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* \addtogroup CborPretty
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* @{
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* <h2 class="groupheader">Text format</h2>
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*
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* As described in RFC 7049 section 6 "Diagnostic Notation", the format is
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* largely borrowed from JSON, but modified to suit CBOR's different data
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* types. TinyCBOR makes further modifications to distinguish different, but
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* similar values.
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*
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* CBOR values are currently encoded as follows:
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* \par Integrals (unsigned and negative)
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* Base-10 (decimal) text representation of the value
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* \par Byte strings:
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* <tt>"h'"</tt> followed by the Base16 (hex) representation of the binary data, followed by an ending quote (')
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* \par Text strings:
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* C-style escaped string in quotes, with C11/C++11 escaping of Unicode codepoints above U+007F.
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* \par Tags:
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* Tag value, with the tagged value in parentheses. No special encoding of the tagged value is performed.
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* \par Simple types:
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* <tt>"simple(nn)"</tt> where \c nn is the simple value
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* \par Null:
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* \c null
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* \par Undefined:
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* \c undefined
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* \par Booleans:
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* \c true or \c false
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* \par Floating point:
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* If NaN or infinite, the actual words \c NaN or \c infinite.
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* Otherwise, the decimal representation with as many digits as necessary to ensure no loss of information.
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* By default, float values are suffixed by "f" and half-float values suffixed by "f16" (doubles have no suffix).
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* If the CborPrettyNumericEncodingIndicators flag is active, the values instead are encoded following the
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* Section 6 recommended encoding indicators: float values are suffixed with "_2" and half-float with "_1".
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* A decimal point is always present.
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* \par Arrays:
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* Comma-separated list of elements, enclosed in square brackets ("[" and "]").
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* \par Maps:
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* Comma-separated list of key-value pairs, with the key and value separated
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* by a colon (":"), enclosed in curly braces ("{" and "}").
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*
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* The CborPrettyFlags enumerator contains flags to control some aspects of the
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* encoding:
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* \par String fragmentation
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* When the CborPrettyShowStringFragments option is active, text and byte
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* strings that are transmitted in fragments are shown instead inside
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* parentheses ("(" and ")") with no preceding number and each fragment is
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* displayed individually. If a tag precedes the string, then the output
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* will contain a double set of parentheses. If the option is not active,
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* the fragments are merged together and the display will not show any
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* difference from a string transmitted with determinate length.
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* \par Encoding indicators
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* Numbers and lengths in CBOR can be encoded in multiple representations.
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* If the CborPrettyIndicateOverlongNumbers option is active, numbers
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* and lengths that are transmitted in a longer encoding than necessary
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* will be indicated, by appending an underscore ("_") to either the
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* number or the opening bracket or brace, followed by a number
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* indicating the CBOR additional information: 0 for 1 byte, 1 for 2
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* bytes, 2 for 4 bytes and 3 for 8 bytes.
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* If the CborPrettyIndicateIndeterminateLength option is active, maps,
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* arrays and strings encoded with indeterminate length will be marked by
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* an underscore after the opening bracket or brace or the string (if not
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* showing fragments), without a number after it.
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*/
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/**
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* \enum CborPrettyFlags
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* The CborPrettyFlags enum contains flags that control the conversion of CBOR to text format.
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*
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* \value CborPrettyNumericEncodingIndicators Use numeric encoding indicators instead of textual for float and half-float.
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* \value CborPrettyTextualEncodingIndicators Use textual encoding indicators for float ("f") and half-float ("f16").
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* \value CborPrettyIndicateIndeterminateLength (default) Indicate when a map or array has indeterminate length.
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* \value CborPrettyIndicateOverlongNumbers Indicate when a number or length was encoded with more bytes than needed.
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* \value CborPrettyShowStringFragments If the byte or text string is transmitted in chunks, show each individually.
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* \value CborPrettyMergeStringFragment Merge all chunked byte or text strings and display them in a single entry.
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* \value CborPrettyDefaultFlags Default conversion flags.
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*/
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#ifndef CBOR_NO_FLOATING_POINT
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static inline bool convertToUint64(double v, uint64_t *absolute) {
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double supremum;
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v = fabs(v);
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/* C11 standard section 6.3.1.4 "Real floating and integer" says:
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*
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* 1 When a finite value of real floating type is converted to an integer
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* type other than _Bool, the fractional part is discarded (i.e., the
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* value is truncated toward zero). If the value of the integral part
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* cannot be represented by the integer type, the behavior is undefined.
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*
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* So we must perform a range check that v <= UINT64_MAX, but we can't use
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* UINT64_MAX + 1.0 because the standard continues:
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*
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* 2 When a value of integer type is converted to a real floating type, if
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* the value being converted can be represented exactly in the new type,
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* it is unchanged. If the value being converted is in the range of
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* values that can be represented but cannot be represented exactly, the
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* result is either the nearest higher or nearest lower representable
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* value, chosen in an implementation-defined manner.
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*/
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supremum = -2.0 * INT64_MIN; /* -2 * (- 2^63) == 2^64 */
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if (v >= supremum)
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return false;
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/* Now we can convert, these two conversions cannot be UB */
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*absolute = v;
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return *absolute == v;
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}
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#endif
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static void printRecursionLimit(CborStreamFunction stream, void *out) {
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stream(out, "<nesting too deep, recursion stopped>");
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}
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static CborError hexDump(CborStreamFunction stream, void *out, const void *ptr, size_t n) {
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const uint8_t *buffer = (const uint8_t *)ptr;
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CborError err = CborNoError;
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while (n-- && !err)
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err = stream(out, "%02" PRIx8, *buffer++);
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return err;
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}
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/* This function decodes buffer as UTF-8 and prints as escaped UTF-16.
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* On UTF-8 decoding error, it returns CborErrorInvalidUtf8TextString */
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static CborError utf8EscapedDump(CborStreamFunction stream, void *out, const void *ptr, size_t n) {
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const uint8_t *buffer = (const uint8_t *)ptr;
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const uint8_t *const end = buffer + n;
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CborError err = CborNoError;
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while (buffer < end && !err) {
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uint32_t uc = get_utf8(&buffer, end);
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if (uc == ~0U)
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return CborErrorInvalidUtf8TextString;
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if (uc < 0x80) {
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/* single-byte UTF-8 */
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unsigned char escaped = (unsigned char)uc;
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if (uc < 0x7f && uc >= 0x20 && uc != '\\' && uc != '"') {
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err = stream(out, "%c", (char)uc);
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continue;
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}
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/* print as an escape sequence */
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switch (uc) {
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case '"':
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case '\\':
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break;
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case '\b':
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escaped = 'b';
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break;
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case '\f':
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escaped = 'f';
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break;
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case '\n':
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escaped = 'n';
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break;
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case '\r':
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escaped = 'r';
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break;
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case '\t':
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escaped = 't';
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break;
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default:
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goto print_utf16;
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}
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err = stream(out, "\\%c", escaped);
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continue;
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}
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/* now print the sequence */
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if (uc > 0xffffU) {
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/* needs surrogate pairs */
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err = stream(out, "\\u%04" PRIX32 "\\u%04" PRIX32,
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(uc >> 10) + 0xd7c0, /* high surrogate */
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(uc % 0x0400) + 0xdc00);
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} else {
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print_utf16:
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/* no surrogate pair needed */
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err = stream(out, "\\u%04" PRIX32, uc);
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}
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}
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return err;
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}
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static const char *resolve_indicator(const uint8_t *ptr, const uint8_t *end, int flags) {
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static const char indicators[8][3] = {
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"_0", "_1", "_2", "_3",
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"", "", "", /* these are not possible */
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"_"
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};
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const char *no_indicator = indicators[5]; /* empty string */
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uint8_t additional_information;
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uint8_t expected_information;
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uint64_t value;
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CborError err;
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if (ptr == end)
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return NULL; /* CborErrorUnexpectedEOF */
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additional_information = (*ptr & SmallValueMask);
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if (additional_information < Value8Bit)
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return no_indicator;
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/* determine whether to show anything */
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if ((flags & CborPrettyIndicateIndeterminateLength) &&
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additional_information == IndefiniteLength)
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return indicators[IndefiniteLength - Value8Bit];
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if ((flags & CborPrettyIndicateOverlongNumbers) == 0)
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return no_indicator;
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err = _cbor_value_extract_number(&ptr, end, &value);
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if (err)
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return NULL; /* CborErrorUnexpectedEOF */
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expected_information = Value8Bit - 1;
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if (value >= Value8Bit)
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++expected_information;
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if (value > 0xffU)
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++expected_information;
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if (value > 0xffffU)
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++expected_information;
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if (value > 0xffffffffU)
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++expected_information;
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return expected_information == additional_information ?
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no_indicator :
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indicators[additional_information - Value8Bit];
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}
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static const char *get_indicator(const CborValue *it, int flags) {
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return resolve_indicator(it->ptr, it->parser->end, flags);
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}
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static CborError value_to_pretty(CborStreamFunction stream, void *out, CborValue *it, int flags, int recursionsLeft);
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static CborError container_to_pretty(CborStreamFunction stream, void *out, CborValue *it, CborType containerType,
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int flags, int recursionsLeft) {
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const char *comma = "";
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CborError err = CborNoError;
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if (!recursionsLeft) {
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printRecursionLimit(stream, out);
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return err; /* do allow the dumping to continue */
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}
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while (!cbor_value_at_end(it) && !err) {
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err = stream(out, "%s", comma);
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comma = ", ";
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if (!err)
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err = value_to_pretty(stream, out, it, flags, recursionsLeft);
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if (containerType == CborArrayType)
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continue;
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/* map: that was the key, so get the value */
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if (!err)
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err = stream(out, ": ");
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if (!err)
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err = value_to_pretty(stream, out, it, flags, recursionsLeft);
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}
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return err;
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}
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static CborError value_to_pretty(CborStreamFunction stream, void *out, CborValue *it, int flags, int recursionsLeft) {
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CborError err = CborNoError;
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CborType type = cbor_value_get_type(it);
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switch (type) {
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case CborArrayType:
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case CborMapType: {
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/* recursive type */
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CborValue recursed;
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const char *indicator = get_indicator(it, flags);
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const char *space = *indicator ? " " : indicator;
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err = stream(out, "%c%s%s", type == CborArrayType ? '[' : '{', indicator, space);
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if (err)
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return err;
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err = cbor_value_enter_container(it, &recursed);
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if (err) {
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it->ptr = recursed.ptr;
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return err; /* parse error */
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}
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err = container_to_pretty(stream, out, &recursed, type, flags, recursionsLeft - 1);
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if (err) {
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it->ptr = recursed.ptr;
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return err; /* parse error */
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}
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err = cbor_value_leave_container(it, &recursed);
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if (err)
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return err; /* parse error */
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return stream(out, type == CborArrayType ? "]" : "}");
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}
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case CborIntegerType: {
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uint64_t val;
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cbor_value_get_raw_integer(it, &val); /* can't fail */
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if (cbor_value_is_unsigned_integer(it)) {
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err = stream(out, "%" PRIu64, val);
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} else {
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/* CBOR stores the negative number X as -1 - X
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* (that is, -1 is stored as 0, -2 as 1 and so forth) */
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if (++val) { /* unsigned overflow may happen */
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err = stream(out, "-%" PRIu64, val);
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} else {
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/* overflown
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* 0xffff`ffff`ffff`ffff + 1 =
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* 0x1`0000`0000`0000`0000 = 18446744073709551616 (2^64) */
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err = stream(out, "-18446744073709551616");
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}
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}
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if (!err)
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err = stream(out, "%s", get_indicator(it, flags));
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break;
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}
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case CborByteStringType:
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case CborTextStringType: {
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size_t n = 0;
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const void *ptr;
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bool showingFragments = (flags & CborPrettyShowStringFragments) && !cbor_value_is_length_known(it);
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const char *separator = "";
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char close = '\'';
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char open[3] = "h'";
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const char *indicator = NULL;
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if (type == CborTextStringType) {
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close = open[0] = '"';
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open[1] = '\0';
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}
|
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if (showingFragments) {
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err = stream(out, "(_ ");
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if (!err)
|
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err = _cbor_value_prepare_string_iteration(it);
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} else {
|
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err = stream(out, "%s", open);
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}
|
|
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while (!err) {
|
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if (showingFragments || indicator == NULL) {
|
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/* any iteration, except the second for a non-chunked string */
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indicator = resolve_indicator(it->ptr, it->parser->end, flags);
|
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}
|
|
|
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err = _cbor_value_get_string_chunk(it, &ptr, &n, it);
|
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if (!ptr)
|
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break;
|
|
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if (!err && showingFragments)
|
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err = stream(out, "%s%s", separator, open);
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if (!err)
|
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err = (type == CborByteStringType ?
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hexDump(stream, out, ptr, n) :
|
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utf8EscapedDump(stream, out, ptr, n));
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if (!err && showingFragments) {
|
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err = stream(out, "%c%s", close, indicator);
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separator = ", ";
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}
|
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}
|
|
|
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if (!err) {
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if (showingFragments)
|
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err = stream(out, ")");
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else
|
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err = stream(out, "%c%s", close, indicator);
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}
|
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return err;
|
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}
|
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|
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case CborTagType: {
|
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CborTag tag;
|
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cbor_value_get_tag(it, &tag); /* can't fail */
|
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err = stream(out, "%" PRIu64 "%s(", tag, get_indicator(it, flags));
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if (!err)
|
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err = cbor_value_advance_fixed(it);
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if (!err && recursionsLeft)
|
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err = value_to_pretty(stream, out, it, flags, recursionsLeft - 1);
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else if (!err)
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printRecursionLimit(stream, out);
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if (!err)
|
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err = stream(out, ")");
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return err;
|
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}
|
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|
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case CborSimpleType: {
|
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/* simple types can't fail and can't have overlong encoding */
|
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uint8_t simple_type;
|
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cbor_value_get_simple_type(it, &simple_type);
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err = stream(out, "simple(%" PRIu8 ")", simple_type);
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break;
|
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}
|
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|
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case CborNullType:
|
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err = stream(out, "null");
|
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break;
|
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|
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case CborUndefinedType:
|
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err = stream(out, "undefined");
|
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break;
|
|
|
|
case CborBooleanType: {
|
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bool val;
|
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cbor_value_get_boolean(it, &val); /* can't fail */
|
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err = stream(out, val ? "true" : "false");
|
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break;
|
|
}
|
|
|
|
#ifndef CBOR_NO_FLOATING_POINT
|
|
case CborDoubleType: {
|
|
const char *suffix;
|
|
double val;
|
|
int r;
|
|
uint64_t ival;
|
|
|
|
if (false) {
|
|
float f;
|
|
case CborFloatType:
|
|
cbor_value_get_float(it, &f);
|
|
val = f;
|
|
suffix = (flags & CborPrettyNumericEncodingIndicators) ? "_2" : "f";
|
|
} else if (false) {
|
|
uint16_t f16;
|
|
case CborHalfFloatType:
|
|
#ifndef CBOR_NO_HALF_FLOAT_TYPE
|
|
cbor_value_get_half_float(it, &f16);
|
|
val = decode_half(f16);
|
|
suffix = (flags & CborPrettyNumericEncodingIndicators) ? "_1" : "f16";
|
|
#else
|
|
(void)f16;
|
|
err = CborErrorUnsupportedType;
|
|
break;
|
|
#endif
|
|
} else {
|
|
cbor_value_get_double(it, &val);
|
|
suffix = "";
|
|
}
|
|
|
|
if ((flags & CborPrettyNumericEncodingIndicators) == 0) {
|
|
r = fpclassify(val);
|
|
if (r == FP_NAN || r == FP_INFINITE)
|
|
suffix = "";
|
|
}
|
|
|
|
if (convertToUint64(val, &ival)) {
|
|
/* this double value fits in a 64-bit integer, so show it as such
|
|
* (followed by a floating point suffix, to disambiguate) */
|
|
err = stream(out, "%s%" PRIu64 ".%s", val < 0 ? "-" : "", ival, suffix);
|
|
} else {
|
|
/* this number is definitely not a 64-bit integer */
|
|
err = stream(out, "%." DBL_DECIMAL_DIG_STR "g%s", val, suffix);
|
|
}
|
|
break;
|
|
}
|
|
#else
|
|
case CborDoubleType:
|
|
case CborFloatType:
|
|
case CborHalfFloatType:
|
|
err = CborErrorUnsupportedType;
|
|
break;
|
|
#endif /* !CBOR_NO_FLOATING_POINT */
|
|
|
|
case CborInvalidType:
|
|
err = stream(out, "invalid");
|
|
if (err)
|
|
return err;
|
|
return CborErrorUnknownType;
|
|
}
|
|
|
|
if (!err)
|
|
err = cbor_value_advance_fixed(it);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* Converts the current CBOR type pointed by \a value to its textual
|
|
* representation and writes it to the stream by calling the \a streamFunction.
|
|
* If an error occurs, this function returns an error code similar to
|
|
* \ref CborParsing.
|
|
*
|
|
* The textual representation can be controlled by the \a flags parameter (see
|
|
* \ref CborPrettyFlags for more information).
|
|
*
|
|
* If no error ocurred, this function advances \a value to the next element.
|
|
* Often, concatenating the text representation of multiple elements can be
|
|
* done by appending a comma to the output stream in between calls to this
|
|
* function.
|
|
*
|
|
* The \a streamFunction function will be called with the \a token value as the
|
|
* first parameter and a printf-style format string as the second, with a variable
|
|
* number of further parameters.
|
|
*
|
|
* \sa cbor_value_to_pretty(), cbor_value_to_json_advance()
|
|
*/
|
|
CborError cbor_value_to_pretty_stream(CborStreamFunction streamFunction, void *token, CborValue *value, int flags) {
|
|
return value_to_pretty(streamFunction, token, value, flags, CBOR_PARSER_MAX_RECURSIONS);
|
|
}
|
|
|
|
/** @} */
|