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size_t base64_encode (char *dest, const char *source, size_t source_len)
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size_t base64_encode (char *dest, const char *source, size_t source_len)
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{
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{
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   // encode a string in its base64 equivalent. It is up to the caller to ensure
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   // encode a string in its base64 equivalent. It is up to the caller to ensure
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   // that dest is large enough to contain the base64 representation of source.
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   // that dest is large enough to contain the base64 representation of source.
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   // Typically, a 4/3 size ratio is needed (i.e. when source is 30 bytes long,
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   // Typically, a 4/3+4 size ratio is needed (i.e. when source is 30 bytes long,
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   // dest should be large enough to contain 40 bytes).
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   // dest should be large enough to contain 44 bytes, the last 4 being padding).
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   // When finished, return the length of the decoded data.
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   // When finished, return the length of the decoded data.
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   static const char char_values[64 + 1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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   static const char char_values[64 + 1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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   unsigned char bytes[3];
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   unsigned char bytes[3];