[#BloombergLP-bdlde-QuotedPrintableDecoder]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlde.adoc[bdlde]::QuotedPrintableDecoder
:relfileprefix: ../../
:mrdocs:

This class implements a mechanism capable of converting data of arbitrary length from its corresponding Quoted‐Printable representation.

== Synopsis

Declared in `<bdlde_quotedprintabledecoder.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class QuotedPrintableDecoder;
----

== Enums

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/EquivalenceClasses.adoc[`EquivalenceClasses`] 
| Input character equivalence classes used by the decoder state machine. Underscored enumerators apply in strict mode; others apply in relaxed mode where noted.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/LineBreakMode-08.adoc[`LineBreakMode`] 
| Configuration governing how hard line breaks (`"rn"`) are decoded.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/2constructor.adoc[`QuotedPrintableDecoder`]         [.small]#[constructor]#
| Create a Quoted‐Printable decoder in the initial state, set to the strict or relaxed error‐reporting mode according to whether the specified `detectError` flag is `true` or `false`, respectively, and also configured to the specified `lineBreakMode`. The behavior is undefined unless `lineBreakMode` is either e_CRLF_MODE or e_LF_MODE. Note that the decoder reports errors in the strict mode and output offending characters in the relaxed mode. Hard line breaks (`\r `) are decoded to `\r ` in e_CRLF_MODE (default) and to `
` in e_LF_MODE.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/2destructor.adoc[`~QuotedPrintableDecoder`] [.small]#[destructor]#
| Destroy this object.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/convert.adoc[`convert`] 
| Append to the buffer addressed by the specified `out` all pending output (if there is any) up to the optionally specified `maxNumOut` limit (default is negative, meaning no limit) and, when there is no pending output and `maxNumOut` is still not reached, begin to consume and decode a sequence of input characters starting at the specified `begin` position, up to but not including the specified `end` position, writing any resulting output in the specified `output` buffer up to the (cumulative) `maxNumOut` limit. If `maxNumOut` limit is reached, no further input will be consumed. Load into the specified `numOut` and `numIn` the number of output bytes produced and input bytes consumed, respectively. Return a non‐negative value on success and a negative value otherwise. A successful return status indicates the number of characters that would be output if `endConvert` were called with no output limit immediately upon exit from this method. These bytes are also available for output if this method is called with a sufficiently large `maxNumOut`. Note that calling this method after `endConvert` has been invoked without an intervening `reset` call will place this instance in an error state, and return an error status. Note also that it is recommended that after all calls to `convert` are finished, the `endConvert` method be called to complete the decoding of any unprocessed input characters (e.g., whitespace).
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/endConvert.adoc[`endConvert`] 
| Terminate encoding for this decoder; write any retained output (e.g., from a previous call to `convert` with a non‐zero `maxNumOut` argument) to the specified `out` buffer. Optionally specify the `maxNumOut` limit on the number of bytes to output; if `maxNumOut` is negative, no limit is imposed. Load into the specified `numOut` the number of output bytes produced. Return 0 on success with no pending output, the positive number of bytes (if any) that would be output if `endConvert` were called with no output limit immediately upon exit from this method, and a negative value otherwise. Any retained bytes are available on a subsequent call to `endConvert`. Once this method is called, no additional input may be supplied without an intervening call to `reset`; once this method returns a zero status, a subsequent call will place this decoder in the error state, and return an error status.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/isAccepting.adoc[`isAccepting`] 
| Return `true` if the input read so far by this decoder is considered syntactically complete and all resulting output has been emitted; return `false` otherwise. Note that there must not be any unprocessed characters accumulated in the input buffer of this decoder.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/isDone.adoc[`isDone`] 
| Return `true` if this decoder is in the done state (i.e., `endConvert` has been called and any additional input will result in an error), and if there is no pending output; return `false` otherwise.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/isError.adoc[`isError`] 
| Return `true` if this decoder has encountered an irrecoverable error and `false` otherwise. An irrecoverable error is one for which there is no subsequent possibility of achieving an "acceptable" result (as defined by the `isAccepting` method).
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/isInitialState.adoc[`isInitialState`] 
| Return `true` if this decoder is in the initial state (i.e., as if no input had been consumed) and `false` otherwise.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/isMaximal.adoc[`isMaximal`] 
| Return `true` if the input to this decoder is maximal (i.e., the input contains an end‐of‐input sentinel, signaling that no further input should be expected). _Always_ returns `false` for Quoted‐Printable decoders since the encoding scheme does not specify an end‐of‐input sentinel.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/isUnrecognizedAnError.adoc[`isUnrecognizedAnError`] 
| Return `true` if this decoder is currently configured to detect an error when an unrecognizable encoding is encountered, and `false` otherwise.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/lineBreakMode-02.adoc[`lineBreakMode`] 
| Return the line break mode specified for this decoder.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/numOutputPending.adoc[`numOutputPending`] 
| Return the number of output bytes retained by this decoder and not emitted because `maxNumOut` has been reached.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/outputLength.adoc[`outputLength`] 
| Return the total length of the output emitted by this decoder (possibly after several calls to the `convert` or the `input` methods) since its initial construction or the latest `reset`.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/reset.adoc[`reset`] 
| Reset this decoder to its initial state (i.e., as if no input had been consumed).
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/lineBreakModeToAscii.adoc[`lineBreakModeToAscii`] 
| Return the ASCII string describing the specified `mode` governing the decoding of hard linebreaks ("rn"). The behavior is undefined unless `mode` is either e_CRLF_MODE or e_LF_MODE.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_buffer.adoc[`d_buffer`] 
| Pending input characters awaiting further decoding.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_bufferLength.adoc[`d_bufferLength`] 
| Number of valid characters currently stored in `d_buffer`.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_equivClass_p.adoc[`d_equivClass_p`] 
| Map of `unsigned char` to input equivalence class; dynamically allocated because there is no default complete configuration.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_hexBuffer.adoc[`d_hexBuffer`] 
| First hex digit buffered while decoding an `=XX` escape sequence.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_lineBreakMode.adoc[`d_lineBreakMode`] 
| How hard line breaks are decoded.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_outputLength.adoc[`d_outputLength`] 
| Total number of output characters produced so far.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_state.adoc[`d_state`] 
| Current decoder state‐machine state.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/d_unrecognizedIsErrorFlag.adoc[`d_unrecognizedIsErrorFlag`] 
| If `true`, unrecognized characters are treated as errors.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_componentName.adoc[`s_componentName`] 
| Name of component used when reporting errors.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_decodingMap_p.adoc[`s_decodingMap_p`] 
| Character map used for converting an ASCII character to the hexadecimal value it is representing.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_defaultEquivClassCRLF_p.adoc[`s_defaultEquivClassCRLF_p`] 
| Default map of `unsigned char` to equivalence class for CRLF line break mode
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_defaultEquivClassStrict_p.adoc[`s_defaultEquivClassStrict_p`] 
| Default map of `unsigned char` to equivalence class for strict mode
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_defaultMaxLineLength.adoc[`s_defaultMaxLineLength`] 
| Default maximum line length used when configuring the decoder.
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_defaultUnrecognizedIsErrorFlag.adoc[`s_defaultUnrecognizedIsErrorFlag`] 
| Default error reporting mode
| xref:BloombergLP/bdlde/QuotedPrintableDecoder/s_lineBreakModeName.adoc[`s_lineBreakModeName`] 
| ASCII names corresponding to `LineBreakMode` enumerators.
|===



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