From 76f145ddcfe2bd0ed6e201d70873cfe3927d80df Mon Sep 17 00:00:00 2001 From: gaisser Date: Wed, 26 Aug 2020 19:59:58 +0200 Subject: [PATCH] Update 'globalfunctions/DleEncoder.cpp' Just a missing char --- globalfunctions/DleEncoder.cpp | 248 ++++++++++++++++----------------- 1 file changed, 124 insertions(+), 124 deletions(-) diff --git a/globalfunctions/DleEncoder.cpp b/globalfunctions/DleEncoder.cpp index 21dbd2e6..8520389d 100644 --- a/globalfunctions/DleEncoder.cpp +++ b/globalfunctions/DleEncoder.cpp @@ -1,124 +1,124 @@ -#include "../globalfunctions/DleEncoder.h" - -DleEncoder::DleEncoder() {} - -DleEncoder::~DleEncoder() {} - -ReturnValue_t DleEncoder::encode(const uint8_t* sourceStream, - size_t sourceLen, uint8_t* destStream, size_t maxDestLen, - size_t* encodedLen, bool addStxEtx) { - if (maxDestLen < 2) { - return STREAM_TOO_SHORT; - } - size_t encodedIndex = 0, sourceIndex = 0; - uint8_t nextByte; - if (addStxEtx) { - destStream[0] = STX_CHAR; - ++encodedIndex; - } - - while (encodedIndex < maxDestLen and sourceIndex < sourceLen) - { - nextByte = sourceStream[sourceIndex]; - // STX, ETX and CR characters in the stream need to be escaped with DLE - if (nextByte == STX_CHAR or nextByte == ETX_CHAR or nextByte == CARRIAGE_RETURN) { - if (encodedIndex + 1 >= maxDestLen) { - return STREAM_TOO_SHORT; - } - else { - destStream[encodedIndex] = DLE_CHAR; - ++encodedIndex; - /* Escaped byte will be actual byte + 0x40. This prevents - * STX, ETX, and carriage return characters from appearing - * in the encoded data stream at all, so when polling an - * encoded stream, the transmission can be stopped at ETX. - * 0x40 was chosen at random with special requirements: - * - Prevent going from one control char to another - * - Prevent overflow for common characters */ - destStream[encodedIndex] = nextByte + 0x40; - } - } - // DLE characters are simply escaped with DLE. - else if (nextByte == DLE_CHAR) { - if (encodedIndex + 1 >= maxDestLen) { - return STREAM_TOO_SHORT; - } - else { - destStream[encodedIndex] = DLE_CHAR; - ++encodedIndex; - destStream[encodedIndex] = DLE_CHAR; - } - } - else { - destStream[encodedIndex] = nextByte; - } - ++encodedIndex; - ++sourceIndex; - } - - if (sourceIndex == sourceLen and encodedIndex < maxDestLen) { - if (addStxEtx) { - destStream[encodedIndex] = ETX_CHAR; - ++encodedIndex; - } - *encodedLen = encodedIndex; - return RETURN_OK; - } - else { - return STREAM_TOO_SHORT; - } -} - -ReturnValue_t DleEncoder::decode(const uint8_t *sourceStream, - size_t sourceStreamLen, size_t *readLen, uint8_t *destStream, - size_t maxDestStreamlen, size_t *decodedLen) { - size_t encodedIndex = 0, decodedIndex = 0; - uint8_t nextByte; - if (*sourceStream != STX_CHAR) { - return DECODING_ERROR; - } - ++encodedIndex; - - while ((encodedIndex < sourceStreamLen) && (decodedIndex < maxDestStreamlen) - && (sourceStream[encodedIndex] != ETX_CHAR) - && (sourceStream[encodedIndex] != STX_CHAR)) { - if (sourceStream[encodedIndex] == DLE_CHAR) { - nextByte = sourceStream[encodedIndex + 1]; - // The next byte is a DLE character that was escaped by another - // DLE character, so we can write it to the destination stream. - if (nextByte == DLE_CHAR) { - destStream[decodedIndex] = nextByte; - } - else { - /* The next byte is a STX, DTX or 0x0D character which - * was escaped by a DLE character. The actual byte was - * also encoded by adding + 0x40 to preven having control chars, - * in the stream at all, so we convert it back. */ - if (nextByte == 0x42 or nextByte == 0x43 or nextByte == 0x4D) { - destStream[decodedIndex] = nextByte - 0x40; - } - else { - return DECODING_ERROR; - } - } - ++encodedIndex; - } - else { - destStream[decodedIndex] = sourceStream[encodedIndex]; - } - - ++encodedIndex; - ++decodedIndex; - } - - if (sourceStream[encodedIndex] != ETX_CHAR) { - *readLen = ++encodedIndex; - return DECODING_ERROR; - } - else { - *readLen = ++encodedIndex; - *decodedLen = decodedIndex; - return RETURN_OK; - } -} - +#include "../globalfunctions/DleEncoder.h" + +DleEncoder::DleEncoder() {} + +DleEncoder::~DleEncoder() {} + +ReturnValue_t DleEncoder::encode(const uint8_t* sourceStream, + size_t sourceLen, uint8_t* destStream, size_t maxDestLen, + size_t* encodedLen, bool addStxEtx) { + if (maxDestLen < 2) { + return STREAM_TOO_SHORT; + } + size_t encodedIndex = 0, sourceIndex = 0; + uint8_t nextByte; + if (addStxEtx) { + destStream[0] = STX_CHAR; + ++encodedIndex; + } + + while (encodedIndex < maxDestLen and sourceIndex < sourceLen) + { + nextByte = sourceStream[sourceIndex]; + // STX, ETX and CR characters in the stream need to be escaped with DLE + if (nextByte == STX_CHAR or nextByte == ETX_CHAR or nextByte == CARRIAGE_RETURN) { + if (encodedIndex + 1 >= maxDestLen) { + return STREAM_TOO_SHORT; + } + else { + destStream[encodedIndex] = DLE_CHAR; + ++encodedIndex; + /* Escaped byte will be actual byte + 0x40. This prevents + * STX, ETX, and carriage return characters from appearing + * in the encoded data stream at all, so when polling an + * encoded stream, the transmission can be stopped at ETX. + * 0x40 was chosen at random with special requirements: + * - Prevent going from one control char to another + * - Prevent overflow for common characters */ + destStream[encodedIndex] = nextByte + 0x40; + } + } + // DLE characters are simply escaped with DLE. + else if (nextByte == DLE_CHAR) { + if (encodedIndex + 1 >= maxDestLen) { + return STREAM_TOO_SHORT; + } + else { + destStream[encodedIndex] = DLE_CHAR; + ++encodedIndex; + destStream[encodedIndex] = DLE_CHAR; + } + } + else { + destStream[encodedIndex] = nextByte; + } + ++encodedIndex; + ++sourceIndex; + } + + if (sourceIndex == sourceLen and encodedIndex < maxDestLen) { + if (addStxEtx) { + destStream[encodedIndex] = ETX_CHAR; + ++encodedIndex; + } + *encodedLen = encodedIndex; + return RETURN_OK; + } + else { + return STREAM_TOO_SHORT; + } +} + +ReturnValue_t DleEncoder::decode(const uint8_t *sourceStream, + size_t sourceStreamLen, size_t *readLen, uint8_t *destStream, + size_t maxDestStreamlen, size_t *decodedLen) { + size_t encodedIndex = 0, decodedIndex = 0; + uint8_t nextByte; + if (*sourceStream != STX_CHAR) { + return DECODING_ERROR; + } + ++encodedIndex; + + while ((encodedIndex < sourceStreamLen) && (decodedIndex < maxDestStreamlen) + && (sourceStream[encodedIndex] != ETX_CHAR) + && (sourceStream[encodedIndex] != STX_CHAR)) { + if (sourceStream[encodedIndex] == DLE_CHAR) { + nextByte = sourceStream[encodedIndex + 1]; + // The next byte is a DLE character that was escaped by another + // DLE character, so we can write it to the destination stream. + if (nextByte == DLE_CHAR) { + destStream[decodedIndex] = nextByte; + } + else { + /* The next byte is a STX, DTX or 0x0D character which + * was escaped by a DLE character. The actual byte was + * also encoded by adding + 0x40 to prevent having control chars, + * in the stream at all, so we convert it back. */ + if (nextByte == 0x42 or nextByte == 0x43 or nextByte == 0x4D) { + destStream[decodedIndex] = nextByte - 0x40; + } + else { + return DECODING_ERROR; + } + } + ++encodedIndex; + } + else { + destStream[decodedIndex] = sourceStream[encodedIndex]; + } + + ++encodedIndex; + ++decodedIndex; + } + + if (sourceStream[encodedIndex] != ETX_CHAR) { + *readLen = ++encodedIndex; + return DECODING_ERROR; + } + else { + *readLen = ++encodedIndex; + *decodedLen = decodedIndex; + return RETURN_OK; + } +} +