316 lines
7.4 KiB
C++
316 lines
7.4 KiB
C++
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/* Based on code from Dave Winer (http://www.scripting.com/midas/base64/) */
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#include "precomp_wasabi_bfc.h"
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#include "base64.h"
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char Base64::encodingTable [64] = {
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'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
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'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
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'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
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'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
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};
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int Base64::encode(MemBlock<char> &htext, MemBlock<char> &h64, int linelength) {
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/*
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encode the handle. some funny stuff about linelength -- it only makes
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sense to make it a multiple of 4. if it's not a multiple of 4, we make it
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so (by only checking it every 4 characters.
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further, if it's 0, we don't add any line breaks at all.
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*/
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unsigned long ixtext;
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unsigned long lentext;
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unsigned long origsize;
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long ctremaining;
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unsigned char inbuf [3] = {0}, outbuf [4] = {0};
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short i;
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short charsonline = 0, ctcopy;
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ixtext = 0;
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lentext = htext.getSize();
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while (1) {
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ctremaining = lentext - ixtext;
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if (ctremaining <= 0)
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break;
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for (i = 0; i < 3; i++) {
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unsigned long ix = ixtext + i;
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if (ix < lentext)
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inbuf [i] = *htext.getMemory(ix);
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else
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inbuf [i] = 0;
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}
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outbuf [0] = (inbuf [0] & 0xFC) >> 2;
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outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4);
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outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6);
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outbuf [3] = inbuf [2] & 0x3F;
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origsize = h64.getSize();
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h64.setSize(origsize + 4);
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ctcopy = 4;
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switch (ctremaining) {
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case 1:
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ctcopy = 2;
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break;
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case 2:
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ctcopy = 3;
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break;
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}
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for (i = 0; i < ctcopy; i++)
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*h64.getMemory(origsize + i) = encodingTable[outbuf[i]];
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for (i = ctcopy; i < 4; i++)
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*h64.getMemory(origsize + i) = '=';
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ixtext += 3;
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charsonline += 4;
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if (linelength > 0) { /*DW 4/8/97 -- 0 means no line breaks*/
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if (charsonline >= linelength) {
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charsonline = 0;
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origsize = h64.getSize();
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h64.setSize(origsize + 1);
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*h64.getMemory() = '\n';
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}
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}
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}
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return 1;
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}
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int Base64::encode(MemBlock<char> &htext, MemBlock<wchar_t> &h64, int linelength) {
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/*
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encode the handle. some funny stuff about linelength -- it only makes
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sense to make it a multiple of 4. if it's not a multiple of 4, we make it
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so (by only checking it every 4 characters.
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further, if it's 0, we don't add any line breaks at all.
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*/
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unsigned long ixtext;
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unsigned long lentext;
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unsigned long origsize;
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long ctremaining;
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unsigned char inbuf [3] = {0}, outbuf [4] = {0};
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short i;
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short charsonline = 0, ctcopy;
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ixtext = 0;
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lentext = htext.getSize();
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while (1) {
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ctremaining = lentext - ixtext;
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if (ctremaining <= 0)
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break;
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for (i = 0; i < 3; i++) {
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unsigned long ix = ixtext + i;
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if (ix < lentext)
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inbuf [i] = *htext.getMemory(ix);
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else
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inbuf [i] = 0;
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}
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outbuf [0] = (inbuf [0] & 0xFC) >> 2;
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outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4);
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outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6);
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outbuf [3] = inbuf [2] & 0x3F;
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origsize = h64.getSize();
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h64.setSize(origsize + 4);
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ctcopy = 4;
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switch (ctremaining) {
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case 1:
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ctcopy = 2;
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break;
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case 2:
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ctcopy = 3;
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break;
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}
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for (i = 0; i < ctcopy; i++)
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*h64.getMemory(origsize + i) = encodingTable[outbuf[i]];
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for (i = ctcopy; i < 4; i++)
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*h64.getMemory(origsize + i) = '=';
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ixtext += 3;
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charsonline += 4;
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if (linelength > 0) { /*DW 4/8/97 -- 0 means no line breaks*/
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if (charsonline >= linelength) {
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charsonline = 0;
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origsize = h64.getSize();
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h64.setSize(origsize + 1);
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*h64.getMemory() = '\n';
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}
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}
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}
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return 1;
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}
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int Base64::decode(MemBlock<char> &h64, MemBlock<char> &htext) {
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unsigned long ixtext;
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unsigned long lentext;
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unsigned long origsize;
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unsigned char ch;
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unsigned char inbuf [4] = {0}, outbuf [4] = {0};
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short i, ixinbuf;
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boolean flignore;
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boolean flendtext = false;
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ixtext = 0;
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lentext = h64.getSize();
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ixinbuf = 0;
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while (true) {
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if (ixtext >= lentext)
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break;
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ch = *h64.getMemory(ixtext++);
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flignore = 0;
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if ((ch >= 'A') && (ch <= 'Z'))
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ch = ch - 'A';
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else if ((ch >= 'a') && (ch <= 'z'))
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ch = ch - 'a' + 26;
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else if ((ch >= '0') && (ch <= '9'))
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ch = ch - '0' + 52;
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else if (ch == '+')
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ch = 62;
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else if (ch == '=') /*no op -- can't ignore this one*/
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flendtext = true;
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else if (ch == '/')
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ch = 63;
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else
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flignore = true;
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if (!flignore) {
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short ctcharsinbuf = 3;
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boolean flbreak = false;
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if (flendtext) {
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if (ixinbuf == 0)
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break;
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if ((ixinbuf == 1) || (ixinbuf == 2))
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ctcharsinbuf = 1;
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else
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ctcharsinbuf = 2;
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ixinbuf = 3;
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flbreak = 1;
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}
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inbuf [ixinbuf++] = ch;
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if (ixinbuf == 4) {
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ixinbuf = 0;
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outbuf [0] = (inbuf [0] << 2) | ((inbuf [1] & 0x30) >> 4);
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outbuf [1] = ((inbuf [1] & 0x0F) << 4) | ((inbuf [2] & 0x3C) >> 2);
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outbuf [2] = ((inbuf [2] & 0x03) << 6) | (inbuf [3] & 0x3F);
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origsize = htext.getSize();
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htext.setSize(origsize + ctcharsinbuf);
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for (i = 0; i < ctcharsinbuf; i++)
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*htext.getMemory(origsize + i) = outbuf[i];
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}
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if (flbreak)
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break;
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}
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}
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return 1;
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}
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int Base64::decode(MemBlock<wchar_t> &h64, MemBlock<char> &htext) {
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unsigned long ixtext;
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unsigned long lentext;
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unsigned long origsize;
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unsigned char ch;
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unsigned char inbuf [4] = {0}, outbuf [4] = {0};
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short i, ixinbuf;
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boolean flignore;
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boolean flendtext = false;
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ixtext = 0;
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lentext = h64.getSize();
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ixinbuf = 0;
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while (true) {
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if (ixtext >= lentext)
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break;
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ch = (unsigned char)*h64.getMemory(ixtext++);
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flignore = 0;
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if ((ch >= 'A') && (ch <= 'Z'))
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ch = ch - 'A';
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else if ((ch >= 'a') && (ch <= 'z'))
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ch = ch - 'a' + 26;
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else if ((ch >= '0') && (ch <= '9'))
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ch = ch - '0' + 52;
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else if (ch == '+')
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ch = 62;
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else if (ch == '=') /*no op -- can't ignore this one*/
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flendtext = true;
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else if (ch == '/')
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ch = 63;
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else
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flignore = true;
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if (!flignore) {
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short ctcharsinbuf = 3;
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boolean flbreak = false;
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if (flendtext) {
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if (ixinbuf == 0)
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break;
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if ((ixinbuf == 1) || (ixinbuf == 2))
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ctcharsinbuf = 1;
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else
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ctcharsinbuf = 2;
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ixinbuf = 3;
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flbreak = 1;
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}
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inbuf [ixinbuf++] = ch;
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if (ixinbuf == 4) {
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ixinbuf = 0;
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outbuf [0] = (inbuf [0] << 2) | ((inbuf [1] & 0x30) >> 4);
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outbuf [1] = ((inbuf [1] & 0x0F) << 4) | ((inbuf [2] & 0x3C) >> 2);
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outbuf [2] = ((inbuf [2] & 0x03) << 6) | (inbuf [3] & 0x3F);
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origsize = htext.getSize();
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htext.setSize(origsize + ctcharsinbuf);
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for (i = 0; i < ctcharsinbuf; i++)
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*htext.getMemory(origsize + i) = outbuf[i];
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}
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if (flbreak)
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break;
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}
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}
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return 1;
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}
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