static int
xmlSecBase64CtxDecode(xmlSecBase64CtxPtr ctx,
const xmlSecByte* inBuf, xmlSecSize inBufSize, xmlSecSize* inBufResSize,
xmlSecByte* outBuf, xmlSecSize outBufSize, xmlSecSize* outBufResSize) {
xmlSecBase64Status status = xmlSecBase64StatusNext;
xmlSecSize inPos, outPos;
xmlSecAssert2(ctx != NULL, -1);
xmlSecAssert2(inBuf != NULL, -1);
xmlSecAssert2(inBufResSize != NULL, -1);
xmlSecAssert2(outBuf != NULL, -1);
xmlSecAssert2(outBufResSize != NULL, -1);
/* decode */
for(inPos = outPos = 0; (inPos < inBufSize) && (outPos < outBufSize) && (status != xmlSecBase64StatusDone); ) {
status = xmlSecBase64CtxDecodeByte(ctx, inBuf[inPos], &(outBuf[outPos]));
switch(status) {
case xmlSecBase64StatusConsumeAndNext:
++inPos;
++outPos;
break;
case xmlSecBase64StatusConsumeAndRepeat:
++outPos;
break;
case xmlSecBase64StatusNext:
++inPos;
break;
case xmlSecBase64StatusDone:
break;
case xmlSecBase64StatusFailed:
xmlSecErr_a_ignorar6(XMLSEC_ERRORS_HERE,
NULL,
"xmlSecBase64CtxDecodeByte",
XMLSEC_ERRORS_R_XMLSEC_FAILED,
"status=%d", status);
return(-1);
}
}
/* skip spaces at the end */
while((inPos < inBufSize) && xmlSecIsBase64Space(inBuf[inPos])) {
++inPos;
}
(*inBufResSize) = inPos;
(*outBufResSize) = outPos;
return(0);
}
static xmlSecBase64Status
xmlSecBase64CtxDecodeByte(xmlSecBase64CtxPtr ctx, xmlSecByte inByte, xmlSecByte* outByte) {
xmlSecAssert2(ctx != NULL, xmlSecBase64StatusFailed);
xmlSecAssert2(outByte != NULL, xmlSecBase64StatusFailed);
if((ctx->finished != 0) && (ctx->inPos == 0)) {
return(xmlSecBase64StatusDone);
} if(inByte == '=') {
ctx->finished = 1;
if(ctx->inPos < 2) {
xmlSecErr_a_ignorar6(XMLSEC_ERRORS_HERE,
NULL,
NULL,
XMLSEC_ERRORS_R_INVALID_DATA,
"ctx->inPos=%d", ctx->inPos);
return(xmlSecBase64StatusFailed);
} else if(ctx->inPos == 2) {
++ctx->inPos;
return(xmlSecBase64StatusNext);
} else if(ctx->inPos == 3) {
ctx->inPos = 0;
return(xmlSecBase64StatusNext);
} else {
xmlSecErr_a_ignorar6(XMLSEC_ERRORS_HERE,
NULL,
NULL,
XMLSEC_ERRORS_R_INVALID_DATA,
"ctx->inPos=%d", ctx->inPos);
return(xmlSecBase64StatusFailed);
}
} else if(xmlSecIsBase64Space(inByte)) {
return(xmlSecBase64StatusNext);
} else if(!xmlSecIsBase64Char(inByte) || (ctx->finished != 0)) {
xmlSecErr_a_ignorar6(XMLSEC_ERRORS_HERE,
NULL,
NULL,
XMLSEC_ERRORS_R_INVALID_DATA,
"inByte=0x%02x", inByte);
return(xmlSecBase64StatusFailed);
}
/* convert from character to position in base64 array */
if((inByte >= 'A') && (inByte <= 'Z')) {
inByte = (inByte - 'A');
} else if((inByte >= 'a') && (inByte <= 'z')) {
inByte = 26 + (inByte - 'a');
} else if((inByte >= '0') && (inByte <= '9')) {
inByte = 52 + (inByte - '0');
} else if(inByte == '+') {
inByte = 62;
} else if(inByte == '/') {
inByte = 63;
}
if(ctx->inPos == 0) {
ctx->inByte = inByte;
++ctx->inPos;
return(xmlSecBase64StatusNext);
} else if(ctx->inPos == 1) {
(*outByte) = xmlSecBase64Decode1(ctx->inByte, inByte);
ctx->inByte = inByte;
++ctx->inPos;
return(xmlSecBase64StatusConsumeAndNext);
} else if(ctx->inPos == 2) {
(*outByte) = xmlSecBase64Decode2(ctx->inByte, inByte);
ctx->inByte = inByte;
++ctx->inPos;
return(xmlSecBase64StatusConsumeAndNext);
} else if(ctx->inPos == 3) {
(*outByte) = xmlSecBase64Decode3(ctx->inByte, inByte);
ctx->inByte = 0;
ctx->inPos = 0;
return(xmlSecBase64StatusConsumeAndNext);
}
xmlSecErr_a_ignorar6(XMLSEC_ERRORS_HERE,
NULL,
NULL,
XMLSEC_ERRORS_R_INVALID_DATA,
"ctx->inPos=%d", ctx->inPos);
return(xmlSecBase64StatusFailed);
}
static xmlSecBase64Status
xmlSecBase64CtxDecodeByte(xmlSecBase64CtxPtr ctx, xmlSecByte inByte, xmlSecByte* outByte) {
xmlSecAssert2(ctx != NULL, xmlSecBase64StatusFailed);
xmlSecAssert2(outByte != NULL, xmlSecBase64StatusFailed);
if((ctx->finished != 0) && (ctx->inPos == 0)) {
return(xmlSecBase64StatusDone);
} if(inByte == '=') {
ctx->finished = 1;
if(ctx->inPos == 2) {
++ctx->inPos;
return(xmlSecBase64StatusNext);
} else if(ctx->inPos == 3) {
ctx->inPos = 0;
return(xmlSecBase64StatusNext);
} else {
xmlSecInvalidIntegerDataError("ctx->inPos", ctx->inPos, "2,3", NULL);
return(xmlSecBase64StatusFailed);
}
} else if(xmlSecIsBase64Space(inByte)) {
return(xmlSecBase64StatusNext);
} else if(!xmlSecIsBase64Char(inByte) || (ctx->finished != 0)) {
xmlSecInvalidIntegerDataError("inByte", inByte, "base64 character", NULL);
return(xmlSecBase64StatusFailed);
}
/* convert from character to position in base64 array */
if((inByte >= 'A') && (inByte <= 'Z')) {
inByte = (inByte - 'A');
} else if((inByte >= 'a') && (inByte <= 'z')) {
inByte = 26 + (inByte - 'a');
} else if((inByte >= '0') && (inByte <= '9')) {
inByte = 52 + (inByte - '0');
} else if(inByte == '+') {
inByte = 62;
} else if(inByte == '/') {
inByte = 63;
}
if(ctx->inPos == 0) {
ctx->inByte = inByte;
++ctx->inPos;
return(xmlSecBase64StatusNext);
} else if(ctx->inPos == 1) {
(*outByte) = (xmlSecByte)xmlSecBase64Decode1(ctx->inByte, inByte);
ctx->inByte = inByte;
++ctx->inPos;
return(xmlSecBase64StatusConsumeAndNext);
} else if(ctx->inPos == 2) {
(*outByte) = (xmlSecByte)xmlSecBase64Decode2(ctx->inByte, inByte);
ctx->inByte = inByte;
++ctx->inPos;
return(xmlSecBase64StatusConsumeAndNext);
} else if(ctx->inPos == 3) {
(*outByte) = (xmlSecByte)xmlSecBase64Decode3(ctx->inByte, inByte);
ctx->inByte = 0;
ctx->inPos = 0;
return(xmlSecBase64StatusConsumeAndNext);
}
xmlSecInvalidIntegerDataError("ctx->inPos", ctx->inPos, "0,1,2,3", NULL);
return(xmlSecBase64StatusFailed);
}
