Martino Ferrari
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/**
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* @file Base64.h
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* @brief Inline Base64 encoder.
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*
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* Used exclusively for the WebSocket HTTP upgrade handshake.
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*/
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#ifndef STREAMHUB_BASE64_H_
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#define STREAMHUB_BASE64_H_
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#include "CompilerTypes.h"
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namespace StreamHub {
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using MARTe::uint8;
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using MARTe::uint32;
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static const char kBase64Chars[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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/**
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* @brief Base64-encode @p inLen bytes from @p in into @p out (null-terminated).
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* @param out Must have room for at least ceil(inLen/3)*4 + 1 bytes.
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* @return Number of characters written (excluding null terminator).
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*/
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inline uint32 Base64Encode(const uint8 *in, uint32 inLen, char *out) {
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uint32 outIdx = 0u;
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uint32 i = 0u;
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while (i + 3u <= inLen) {
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out[outIdx++] = kBase64Chars[(in[i] >> 2u) & 0x3Fu];
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out[outIdx++] = kBase64Chars[((in[i] & 0x03u) << 4u) | ((in[i+1u] >> 4u) & 0x0Fu)];
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out[outIdx++] = kBase64Chars[((in[i+1u] & 0x0Fu) << 2u) | ((in[i+2u] >> 6u) & 0x03u)];
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out[outIdx++] = kBase64Chars[in[i+2u] & 0x3Fu];
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i += 3u;
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}
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uint32 rem = inLen - i;
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if (rem == 1u) {
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out[outIdx++] = kBase64Chars[(in[i] >> 2u) & 0x3Fu];
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out[outIdx++] = kBase64Chars[(in[i] & 0x03u) << 4u];
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out[outIdx++] = '=';
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out[outIdx++] = '=';
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} else if (rem == 2u) {
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out[outIdx++] = kBase64Chars[(in[i] >> 2u) & 0x3Fu];
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out[outIdx++] = kBase64Chars[((in[i] & 0x03u) << 4u) | ((in[i+1u] >> 4u) & 0x0Fu)];
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out[outIdx++] = kBase64Chars[(in[i+1u] & 0x0Fu) << 2u];
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out[outIdx++] = '=';
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}
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out[outIdx] = '\0';
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return outIdx;
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}
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} /* namespace StreamHub */
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#endif /* STREAMHUB_BASE64_H_ */
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