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Added calculation for encoded output size based on input size. Calculated size is never more than a byte larger than the actual size.

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This commit is contained in:
Jordan Cristiano 2015-06-21 02:21:33 -04:00
parent 3acc56055c
commit 8b73c4041b
2 changed files with 14 additions and 0 deletions
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1
external/libb64-1.2.1/include/b64/cencode.h vendored
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@ -28,6 +28,7 @@ typedef struct
void base64_init_encodestate(base64_encodestate* state_in);
int base64_calc_buffer_length(int length_in, const base64_encodestate* state_in);
int base64_encode_block(const char* plaintext_in, int length_in, char* code_out, base64_encodestate* state_in);

13
external/libb64-1.2.1/src/cencode.c vendored
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@ -24,6 +24,19 @@ char base64_encode_value(char value_in)
return encoding[(int)value_in];
}
/*
Output_size calculation from:
http://stackoverflow.com/questions/1533113/calculate-the-size-to-a-base-64-encoded-message
Never more than a byte larger than the actual encoded size.
Guaranteed equal to or larger than the actual encoded size.
*/
int base64_calc_buffer_length(int length_in, const base64_encodestate* state_in)
{
const int blockend_newline = ((BASE64_ENC_NO_NEWLINE_TERM & state_in->flags) == 0);
const int output_length = ((((length_in - 1) / 3) * 4) + 4);
return output_length + blockend_newline + (output_length / CHARS_PER_LINE);
}
int base64_encode_block(const char* plaintext_in, int length_in, char* code_out, base64_encodestate* state_in)
{
int stepcount = state_in->stepcount;