mirror of
https://github.com/reactos/CMake.git
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226 lines
7.5 KiB
C
226 lines
7.5 KiB
C
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing#kwsys for details. */
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#include "kwsysPrivate.h"
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#include KWSYS_HEADER(Base64.h)
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/* Work-around CMake dependency scanning limitation. This must
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duplicate the above list of headers. */
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#if 0
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# include "Base64.h.in"
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#endif
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static const unsigned char kwsysBase64EncodeTable[65] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static const unsigned char kwsysBase64DecodeTable[256] = {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xFF, 0xFF, 0x3F, 0x34, 0x35, 0x36, 0x37,
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0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF,
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C,
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0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D,
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0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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/*------------------------------------*/
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
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};
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static unsigned char kwsysBase64EncodeChar(int c)
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{
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return kwsysBase64EncodeTable[(unsigned char)c];
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}
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static unsigned char kwsysBase64DecodeChar(unsigned char c)
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{
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return kwsysBase64DecodeTable[c];
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}
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/* Encode 3 bytes into a 4 byte string. */
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void kwsysBase64_Encode3(const unsigned char* src, unsigned char* dest)
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{
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dest[0] = kwsysBase64EncodeChar((src[0] >> 2) & 0x3F);
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dest[1] =
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kwsysBase64EncodeChar(((src[0] << 4) & 0x30) | ((src[1] >> 4) & 0x0F));
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dest[2] =
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kwsysBase64EncodeChar(((src[1] << 2) & 0x3C) | ((src[2] >> 6) & 0x03));
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dest[3] = kwsysBase64EncodeChar(src[2] & 0x3F);
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}
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/* Encode 2 bytes into a 4 byte string. */
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void kwsysBase64_Encode2(const unsigned char* src, unsigned char* dest)
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{
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dest[0] = kwsysBase64EncodeChar((src[0] >> 2) & 0x3F);
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dest[1] =
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kwsysBase64EncodeChar(((src[0] << 4) & 0x30) | ((src[1] >> 4) & 0x0F));
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dest[2] = kwsysBase64EncodeChar(((src[1] << 2) & 0x3C));
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dest[3] = '=';
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}
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/* Encode 1 bytes into a 4 byte string. */
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void kwsysBase64_Encode1(const unsigned char* src, unsigned char* dest)
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{
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dest[0] = kwsysBase64EncodeChar((src[0] >> 2) & 0x3F);
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dest[1] = kwsysBase64EncodeChar(((src[0] << 4) & 0x30));
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dest[2] = '=';
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dest[3] = '=';
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}
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/* Encode 'length' bytes from the input buffer and store the
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encoded stream into the output buffer. Return the length of the encoded
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buffer (output). Note that the output buffer must be allocated by the caller
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(length * 1.5 should be a safe estimate). If 'mark_end' is true than an
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extra set of 4 bytes is added to the end of the stream if the input is a
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multiple of 3 bytes. These bytes are invalid chars and therefore they will
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stop the decoder thus enabling the caller to decode a stream without
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actually knowing how much data to expect (if the input is not a multiple of
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3 bytes then the extra padding needed to complete the encode 4 bytes will
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stop the decoding anyway). */
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size_t kwsysBase64_Encode(const unsigned char* input, size_t length,
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unsigned char* output, int mark_end)
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{
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const unsigned char* ptr = input;
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const unsigned char* end = input + length;
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unsigned char* optr = output;
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/* Encode complete triplet */
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while ((end - ptr) >= 3) {
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kwsysBase64_Encode3(ptr, optr);
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ptr += 3;
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optr += 4;
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}
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/* Encodes a 2-byte ending into 3 bytes and 1 pad byte and writes. */
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if (end - ptr == 2) {
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kwsysBase64_Encode2(ptr, optr);
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optr += 4;
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}
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/* Encodes a 1-byte ending into 2 bytes and 2 pad bytes */
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else if (end - ptr == 1) {
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kwsysBase64_Encode1(ptr, optr);
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optr += 4;
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}
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/* Do we need to mark the end */
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else if (mark_end) {
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optr[0] = optr[1] = optr[2] = optr[3] = '=';
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optr += 4;
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}
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return (size_t)(optr - output);
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}
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/* Decode 4 bytes into a 3 byte string. */
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int kwsysBase64_Decode3(const unsigned char* src, unsigned char* dest)
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{
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unsigned char d0, d1, d2, d3;
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d0 = kwsysBase64DecodeChar(src[0]);
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d1 = kwsysBase64DecodeChar(src[1]);
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d2 = kwsysBase64DecodeChar(src[2]);
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d3 = kwsysBase64DecodeChar(src[3]);
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/* Make sure all characters were valid */
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if (d0 == 0xFF || d1 == 0xFF || d2 == 0xFF || d3 == 0xFF) {
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return 0;
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}
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/* Decode the 3 bytes */
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dest[0] = (unsigned char)(((d0 << 2) & 0xFC) | ((d1 >> 4) & 0x03));
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dest[1] = (unsigned char)(((d1 << 4) & 0xF0) | ((d2 >> 2) & 0x0F));
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dest[2] = (unsigned char)(((d2 << 6) & 0xC0) | ((d3 >> 0) & 0x3F));
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/* Return the number of bytes actually decoded */
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if (src[2] == '=') {
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return 1;
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}
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if (src[3] == '=') {
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return 2;
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}
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return 3;
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}
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/* Decode bytes from the input buffer and store the decoded stream
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into the output buffer until 'length' bytes have been decoded. Return the
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real length of the decoded stream (which should be equal to 'length'). Note
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that the output buffer must be allocated by the caller. If
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'max_input_length' is not null, then it specifies the number of encoded
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bytes that should be at most read from the input buffer. In that case the
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'length' parameter is ignored. This enables the caller to decode a stream
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without actually knowing how much decoded data to expect (of course, the
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buffer must be large enough). */
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size_t kwsysBase64_Decode(const unsigned char* input, size_t length,
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unsigned char* output, size_t max_input_length)
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{
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const unsigned char* ptr = input;
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unsigned char* optr = output;
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/* Decode complete triplet */
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if (max_input_length) {
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const unsigned char* end = input + max_input_length;
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while (ptr < end) {
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int len = kwsysBase64_Decode3(ptr, optr);
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optr += len;
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if (len < 3) {
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return (size_t)(optr - output);
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}
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ptr += 4;
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}
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} else {
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unsigned char* oend = output + length;
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while ((oend - optr) >= 3) {
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int len = kwsysBase64_Decode3(ptr, optr);
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optr += len;
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if (len < 3) {
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return (size_t)(optr - output);
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}
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ptr += 4;
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}
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/* Decode the last triplet */
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if (oend - optr == 2) {
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unsigned char temp[3];
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int len = kwsysBase64_Decode3(ptr, temp);
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if (len >= 2) {
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optr[0] = temp[0];
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optr[1] = temp[1];
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optr += 2;
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} else if (len > 0) {
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optr[0] = temp[0];
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optr += 1;
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}
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} else if (oend - optr == 1) {
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unsigned char temp[3];
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int len = kwsysBase64_Decode3(ptr, temp);
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if (len > 0) {
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optr[0] = temp[0];
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optr += 1;
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}
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}
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}
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return (size_t)(optr - output);
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}
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