Initial project import
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module base64
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// encode_in_buffer base64 encodes the `[]u8` passed in `data` into `buffer`.
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// encode_in_buffer returns the size of the encoded data in the buffer.
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// Please note: The buffer should be large enough (i.e. 4/3 of the data.len, or larger) to hold the encoded data.
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// Please note: The function does NOT allocate new memory, and is suitable for handling very large strings.
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pub fn encode_in_buffer(data []u8, buffer &u8) int {
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return encode_from_buffer(buffer, data.data, data.len)
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}
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// encode_from_buffer will perform encoding from any type of src buffer
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// and write the bytes into `dest`.
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// Please note: The `dest` buffer should be large enough (i.e. 4/3 of the src_len, or larger) to hold the encoded data.
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// Please note: This function is for internal base64 encoding
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fn encode_from_buffer(dest &u8, src &u8, src_len int) int {
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if src_len == 0 {
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return 0
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}
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output_length := 4 * ((src_len + 2) / 3)
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mut d := unsafe { src }
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mut b := unsafe { dest }
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etable := enc_table.str
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mut di := 0
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mut si := 0
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n := (src_len / 3) * 3
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for si < n {
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// Convert 3x 8bit source bytes into 4 bytes
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unsafe {
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val := u32(d[si + 0]) << 16 | u32(d[si + 1]) << 8 | u32(d[si + 2])
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b[di + 0] = etable[(val >> 18) & 0x3F]
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b[di + 1] = etable[(val >> 12) & 0x3F]
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b[di + 2] = etable[(val >> 6) & 0x3F]
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b[di + 3] = etable[val & 0x3F]
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}
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si += 3
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di += 4
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}
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remain := src_len - si
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if remain == 0 {
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return output_length
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}
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// Add the remaining small block and padding
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unsafe {
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mut val := u32(d[si + 0]) << 16
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if remain == 2 {
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val |= u32(d[si + 1]) << 8
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}
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b[di + 0] = etable[(val >> 18) & 0x3F]
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b[di + 1] = etable[(val >> 12) & 0x3F]
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match remain {
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2 {
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b[di + 2] = etable[(val >> 6) & 0x3F]
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b[di + 3] = u8(`=`)
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}
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1 {
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b[di + 2] = u8(`=`)
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b[di + 3] = u8(`=`)
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}
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else {
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panic('base64: This case should never occur.')
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}
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}
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}
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return output_length
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}
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// decode_in_buffer decodes the base64 encoded `string` reference passed in `data` into `buffer`.
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// decode_in_buffer returns the size of the decoded data in the buffer.
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// Please note: The `buffer` should be large enough (i.e. 3/4 of the data.len, or larger)
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// to hold the decoded data.
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// Please note: This function does NOT allocate new memory, and is thus suitable for handling very large strings.
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pub fn decode_in_buffer(data &string, buffer &u8) int {
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return decode_from_buffer(buffer, data.str, data.len)
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}
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// decode_from_buffer decodes the base64 encoded ASCII bytes from `data` into `buffer`.
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// decode_from_buffer returns the size of the decoded data in the buffer.
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// Please note: The `buffer` should be large enough (i.e. 3/4 of the data.len, or larger)
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// to hold the decoded data.
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// Please note: This function does NOT allocate new memory, and is thus suitable for handling very large strings.
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pub fn decode_in_buffer_bytes(data []u8, buffer &u8) int {
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return decode_from_buffer(buffer, data.data, data.len)
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}
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// decode_from_buffer decodes the base64 encoded ASCII bytes from `src` into `dest`.
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// decode_from_buffer returns the size of the decoded data in the buffer.
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// Please note: The `dest` buffer should be large enough (i.e. 3/4 of the `src_len`, or larger)
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// to hold the decoded data.
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// Please note: This function does NOT allocate new memory, and is thus suitable for handling very large strings.
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// Please note: This function is for internal base64 decoding
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fn decode_from_buffer(dest &u8, src &u8, src_len int) int {
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if src_len < 4 {
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return 0
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}
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mut padding := 0
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if unsafe { src[src_len - 1] == `=` } {
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if unsafe { src[src_len - 2] == `=` } {
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padding = 2
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} else {
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padding = 1
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}
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}
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mut d := unsafe { src }
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mut b := unsafe { dest }
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unsafe {
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mut n_decoded_bytes := 0 // padding bytes are also counted towards this.
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mut si := 0
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mut datablock_64 := B64_64_datablock{
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data: 0
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}
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mut datablock_32 := B64_32_datablock{
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data: 0
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}
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for src_len - si >= 8 {
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// Converting 8 bytes of input into 6 bytes of output. Storing these in the upper bytes of an u64.
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datablock_64.data = assemble64(u8(index[d[si + 0]]), u8(index[d[si + 1]]), u8(index[d[
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si + 2]]), u8(index[d[si + 3]]), u8(index[d[si + 4]]), u8(index[d[si + 5]]), u8(index[d[
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si + 6]]), u8(index[d[si + 7]]))
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// Reading out the individual bytes from the u64. Watch out with endianness.
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$if little_endian {
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b[n_decoded_bytes + 0] = datablock_64.data_byte[7]
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b[n_decoded_bytes + 1] = datablock_64.data_byte[6]
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b[n_decoded_bytes + 2] = datablock_64.data_byte[5]
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b[n_decoded_bytes + 3] = datablock_64.data_byte[4]
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b[n_decoded_bytes + 4] = datablock_64.data_byte[3]
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b[n_decoded_bytes + 5] = datablock_64.data_byte[2]
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} $else {
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b[n_decoded_bytes + 0] = datablock_64.data_byte[0]
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b[n_decoded_bytes + 1] = datablock_64.data_byte[1]
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b[n_decoded_bytes + 2] = datablock_64.data_byte[2]
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b[n_decoded_bytes + 3] = datablock_64.data_byte[3]
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b[n_decoded_bytes + 4] = datablock_64.data_byte[4]
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b[n_decoded_bytes + 5] = datablock_64.data_byte[5]
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}
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n_decoded_bytes += 6
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si += 8
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}
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for src_len - si >= 4 {
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datablock_32.data = assemble32(u8(index[d[si + 0]]), u8(index[d[si + 1]]), u8(index[d[
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si + 2]]), u8(index[d[si + 3]]))
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$if little_endian {
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b[n_decoded_bytes + 0] = datablock_32.data_byte[3]
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b[n_decoded_bytes + 1] = datablock_32.data_byte[2]
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b[n_decoded_bytes + 2] = datablock_32.data_byte[1]
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b[n_decoded_bytes + 3] = datablock_32.data_byte[0]
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} $else {
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b[n_decoded_bytes + 0] = datablock_32.data_byte[0]
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b[n_decoded_bytes + 1] = datablock_32.data_byte[1]
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b[n_decoded_bytes + 2] = datablock_32.data_byte[2]
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b[n_decoded_bytes + 3] = datablock_32.data_byte[3]
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}
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n_decoded_bytes += 3
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si += 4
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}
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return n_decoded_bytes - padding
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}
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}
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union B64_64_datablock {
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mut:
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data u64
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data_byte [8]u8
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}
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union B64_32_datablock {
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mut:
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data u32
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data_byte [4]u8
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}
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// decode decodes the base64 encoded `string` value passed in `data`.
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// Please note: If you need to decode many strings repeatedly, take a look at `decode_in_buffer`.
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// Example: assert base64.decode('ViBpbiBiYXNlIDY0') == 'V in base 64'.bytes()
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pub fn decode(data string) []u8 {
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mut size := i64(data.len) * 3 / 4
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if size <= 0 || data.len % 4 != 0 {
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return []
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}
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size = (size + 3) & ~0x03 // round to the next multiple of 4 (the decoding loop writes multiples of 4 bytes)
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unsafe {
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buffer := malloc(int(size))
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n := decode_in_buffer(data, buffer)
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return buffer.vbytes(n)
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}
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}
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// decode_str is the string variant of decode
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pub fn decode_str(data string) string {
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size := data.len * 3 / 4
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if size <= 0 || data.len % 4 != 0 {
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return ''
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}
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unsafe {
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buffer := malloc_noscan(size + 1)
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buffer[size] = 0
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blen := decode_in_buffer(data, buffer)
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return tos(buffer, blen)
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}
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}
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// encode encodes the `[]u8` value passed in `data` to base64.
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// Please note: base64 encoding returns a `string` that is ~ 4/3 larger than the input.
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// Please note: If you need to encode many strings repeatedly, take a look at `encode_in_buffer`.
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// Example: assert base64.encode('V in base 64'.bytes()) == 'ViBpbiBiYXNlIDY0'
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pub fn encode(data []u8) string {
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return alloc_and_encode(data.data, data.len)
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}
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// encode_str is the string variant of encode
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pub fn encode_str(data string) string {
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return alloc_and_encode(data.str, data.len)
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}
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// alloc_and_encode is a private function that allocates and encodes data into a string
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// Used by encode and encode_str
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fn alloc_and_encode(src &u8, len int) string {
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if len == 0 {
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return ''
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}
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size := 4 * ((len + 2) / 3)
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if size <= 0 {
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return ''
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}
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unsafe {
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buffer := malloc_noscan(size + 1)
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buffer[size] = 0
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blen := encode_from_buffer(buffer, src, len)
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return tos(buffer, blen)
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}
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}
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@@ -0,0 +1,66 @@
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// Copyright (c) 2019-2024 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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// Based off: https://github.com/golang/go/blob/master/src/encoding/base64/base64.go
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// Last commit: https://github.com/golang/go/commit/9a93baf4d7d13d7d5c67388c93960d78abc8e11e
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module base64
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const index = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 63, 62, 62, 63, 52, 53, 54, 55, 56, 57,
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58, 59, 60, 61, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 63, 0, 26, 27, 28, 29, 30, 31, 32, 33,
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34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51]!
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const ending_table = [0, 2, 1]!
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const enc_table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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// url_decode returns a decoded URL `string` version of
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// the a base64 url encoded `string` passed in `data`.
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pub fn url_decode(data string) []u8 {
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mut result := data.replace_each(['-', '+', '_', '/'])
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match result.len % 4 {
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// Pad with trailing '='s
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2 { result += '==' } // 2 pad chars
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3 { result += '=' } // 1 pad char
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else {} // no padding
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}
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return decode(result)
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}
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// url_decode_str is the string variant of url_decode
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pub fn url_decode_str(data string) string {
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mut result := data.replace_each(['-', '+', '_', '/'])
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match result.len % 4 {
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// Pad with trailing '='s
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2 { result += '==' } // 2 pad chars
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3 { result += '=' } // 1 pad char
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else {} // no padding
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}
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return decode_str(result)
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}
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// url_encode returns a base64 URL encoded `string` version
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// of the value passed in `data`.
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pub fn url_encode(data []u8) string {
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return encode(data).replace_each(['+', '-', '/', '_', '=', ''])
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}
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// url_encode_str is the string variant of url_encode
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pub fn url_encode_str(data string) string {
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return encode_str(data).replace_each(['+', '-', '/', '_', '=', ''])
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}
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// assemble64 assembles 8 base64 digits into 6 bytes.
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// Each digit comes from the decode map.
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// Please note: Invalid base64 digits are not expected and not handled.
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fn assemble64(n1 u8, n2 u8, n3 u8, n4 u8, n5 u8, n6 u8, n7 u8, n8 u8) u64 {
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return u64(n1) << 58 | u64(n2) << 52 | u64(n3) << 46 | u64(n4) << 40 | u64(n5) << 34 | u64(n6) << 28 | u64(n7) << 22 | u64(n8) << 16
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}
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// assemble32 assembles 4 base64 digits into 3 bytes.
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// Each digit comes from the decode map.
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// Please note: Invalid base64 digits are not expected and not handled.
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fn assemble32(n1 u8, n2 u8, n3 u8, n4 u8) u32 {
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return u32(n1) << 26 | u32(n2) << 20 | u32(n3) << 14 | u32(n4) << 8
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}
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@@ -0,0 +1,59 @@
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import encoding.base64
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fn test_long_encoding() {
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repeats := 1000
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input_size := 3000
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s_original := []u8{len: input_size, init: `a`}
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s_encoded := base64.encode(s_original)
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s_encoded_bytes := s_encoded.bytes()
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s_decoded := base64.decode(s_encoded)
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assert s_encoded.len > s_original.len
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assert s_original == s_decoded
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ebuffer := unsafe { malloc(s_encoded.len) }
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dbuffer := unsafe { malloc(s_decoded.len) }
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defer {
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unsafe { free(ebuffer) }
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unsafe { free(dbuffer) }
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}
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encoded_size := base64.encode_in_buffer(s_original, ebuffer)
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mut encoded_in_buf := []u8{len: encoded_size}
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unsafe { vmemcpy(encoded_in_buf.data, ebuffer, encoded_size) }
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assert input_size * 4 / 3 == encoded_size
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assert encoded_in_buf[0] == `Y`
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assert encoded_in_buf[1] == `W`
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assert encoded_in_buf[2] == `F`
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assert encoded_in_buf[3] == `h`
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assert encoded_in_buf[encoded_size - 4] == `Y`
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assert encoded_in_buf[encoded_size - 3] == `W`
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assert encoded_in_buf[encoded_size - 2] == `F`
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assert encoded_in_buf[encoded_size - 1] == `h`
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assert encoded_in_buf == s_encoded_bytes
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decoded_size := base64.decode_in_buffer(s_encoded, dbuffer)
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assert decoded_size == input_size
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mut decoded_in_buf := []u8{len: decoded_size}
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unsafe { vmemcpy(decoded_in_buf.data, dbuffer, decoded_size) }
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assert decoded_in_buf == s_original
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mut s := 0
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for _ in 0 .. repeats {
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resultsize := base64.encode_in_buffer(s_original, ebuffer)
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s += resultsize
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assert resultsize == s_encoded.len
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}
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for _ in 0 .. repeats {
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resultsize := base64.decode_in_buffer(s_encoded, dbuffer)
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s += resultsize
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assert resultsize == s_decoded.len
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}
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println('Final s: ${s}')
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// assert s == 39147008
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}
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@@ -0,0 +1,148 @@
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import encoding.base64
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struct TestPair {
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decoded string
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encoded string
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}
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const pairs = [
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// RFC 3548 examples
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TestPair{'\x14\xfb\x9c\x03\xd9\x7e', 'FPucA9l+'},
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TestPair{'\x14\xfb\x9c\x03\xd9', 'FPucA9k='},
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TestPair{'\x14\xfb\x9c\x03', 'FPucAw=='},
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// RFC 4648 examples
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TestPair{'', ''},
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TestPair{'f', 'Zg=='},
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TestPair{'fo', 'Zm8='},
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TestPair{'foo', 'Zm9v'},
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TestPair{'foob', 'Zm9vYg=='},
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TestPair{'fooba', 'Zm9vYmE='},
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TestPair{'foobar', 'Zm9vYmFy'},
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// Wikipedia examples
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TestPair{'sure.', 'c3VyZS4='},
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TestPair{'sure', 'c3VyZQ=='},
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TestPair{'sur', 'c3Vy'},
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TestPair{'su', 'c3U='},
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TestPair{'leasure.', 'bGVhc3VyZS4='},
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TestPair{'easure.', 'ZWFzdXJlLg=='},
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TestPair{'asure.', 'YXN1cmUu'},
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TestPair{'sure.', 'c3VyZS4='},
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]
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|
||||
const man_pair = TestPair{'Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight in the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure.', 'TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4='}
|
||||
|
||||
fn test_decode() {
|
||||
assert base64.decode(man_pair.encoded) == man_pair.decoded.bytes()
|
||||
|
||||
// Test for incorrect padding.
|
||||
assert base64.decode('aGk') == ''.bytes()
|
||||
assert base64.decode('aGk=') == 'hi'.bytes()
|
||||
assert base64.decode('aGk==') == ''.bytes()
|
||||
|
||||
for i, p in pairs {
|
||||
got := base64.decode(p.encoded)
|
||||
if got != p.decoded.bytes() {
|
||||
eprintln('pairs[${i}]: expected = ${p.decoded}, got = ${got}')
|
||||
assert false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn test_decode_str() {
|
||||
assert base64.decode_str(man_pair.encoded) == man_pair.decoded
|
||||
|
||||
// Test for incorrect padding.
|
||||
assert base64.decode_str('aGk') == ''
|
||||
assert base64.decode_str('aGk=') == 'hi'
|
||||
assert base64.decode_str('aGk==') == ''
|
||||
|
||||
for i, p in pairs {
|
||||
got := base64.decode_str(p.encoded)
|
||||
if got != p.decoded {
|
||||
eprintln('pairs[${i}]: expected = ${p.decoded}, got = ${got}')
|
||||
assert false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn test_encode() {
|
||||
assert base64.encode(man_pair.decoded.bytes()) == man_pair.encoded
|
||||
|
||||
for i, p in pairs {
|
||||
got := base64.encode(p.decoded.bytes())
|
||||
if got != p.encoded {
|
||||
eprintln('pairs[${i}]: expected = ${p.encoded}, got = ${got}')
|
||||
assert false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn test_encode_str() {
|
||||
assert base64.encode_str(man_pair.decoded) == man_pair.encoded
|
||||
|
||||
for i, p in pairs {
|
||||
got := base64.encode_str(p.decoded)
|
||||
if got != p.encoded {
|
||||
eprintln('pairs[${i}]: expected = ${p.encoded}, got = ${got}')
|
||||
assert false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn test_url_encode() {
|
||||
test := base64.url_encode('Hello Base64Url encoding!'.bytes())
|
||||
assert test == 'SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ'
|
||||
}
|
||||
|
||||
fn test_url_encode_str() {
|
||||
test := base64.url_encode_str('Hello Base64Url encoding!')
|
||||
assert test == 'SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ'
|
||||
}
|
||||
|
||||
fn test_url_decode() {
|
||||
test := base64.url_decode('SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ')
|
||||
assert test == 'Hello Base64Url encoding!'.bytes()
|
||||
}
|
||||
|
||||
fn test_url_decode_str() {
|
||||
test := base64.url_decode_str('SGVsbG8gQmFzZTY0VXJsIGVuY29kaW5nIQ')
|
||||
assert test == 'Hello Base64Url encoding!'
|
||||
}
|
||||
|
||||
fn test_encode_null_u8() {
|
||||
assert base64.encode([u8(`A`), 0, `C`]) == 'QQBD'
|
||||
}
|
||||
|
||||
fn test_encode_null_byte_str() {
|
||||
// While this works, bytestr() does a memcpy
|
||||
s := [u8(`A`), 0, `C`].bytestr()
|
||||
assert base64.encode_str(s) == 'QQBD'
|
||||
}
|
||||
|
||||
fn test_decode_null_u8() {
|
||||
assert base64.decode('QQBD') == [u8(`A`), 0, `C`]
|
||||
}
|
||||
|
||||
fn test_decode_null_byte_str() {
|
||||
// While this works, bytestr() does a memcpy
|
||||
s := [u8(`A`), 0, `C`].bytestr()
|
||||
assert base64.decode_str('QQBD') == s
|
||||
}
|
||||
|
||||
fn test_decode_in_buffer_bytes() {
|
||||
rfc4648_pairs := [
|
||||
TestPair{'foob', 'Zm9vYg=='},
|
||||
TestPair{'fooba', 'Zm9vYmE='},
|
||||
TestPair{'foobar', 'Zm9vYmFy'},
|
||||
]
|
||||
mut src_dec_buf := []u8{len: 8}
|
||||
mut src_enc_buf := []u8{len: 8}
|
||||
mut out_buf := []u8{len: 8}
|
||||
|
||||
for p in rfc4648_pairs {
|
||||
src_dec_buf = p.decoded.bytes()
|
||||
src_enc_buf = p.encoded.bytes()
|
||||
n := base64.decode_in_buffer_bytes(src_enc_buf, out_buf.data)
|
||||
assert src_dec_buf == out_buf[..n]
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user