48 //      FALSE(0)    failure
58     ctx->buffer = buffer;  in ASN1UnmarshalContextInitialize()
59     ctx->size = size;  in ASN1UnmarshalContextInitialize()
60     ctx->offset = 0;  in ASN1UnmarshalContextInitialize()
61     ctx->tag = 0xFF;  in ASN1UnmarshalContextInitialize()
80     VERIFY(ctx->offset < ctx->size);  in ASN1DecodeLength()
111     ctx->size = -1;             // Makes everything fail from now on.  in ASN1DecodeLength()
112     return -1;  in ASN1DecodeLength()
129     VERIFY(ctx->offset < ctx->size);  in ASN1NextTag()
131     ctx->tag = NEXT_OCTET(ctx);  in ASN1NextTag()
133     VERIFY((ctx->tag & 0x1F) != 0x1F);  in ASN1NextTag()
138     // Attempt to read beyond the end of the context or an illegal tag  in ASN1NextTag()
139     ctx->size = -1;         // Persistent failure  in ASN1NextTag()
140     ctx->tag = 0xFF;  in ASN1NextTag()
141     return -1;  in ASN1NextTag()
149 // If there is a general parsing error, the context->size is set to -1.
152 //      FALSE(0)    failure
166     VERIFY(ctx->tag == ASN1_BITSTRING);  in ASN1GetBitStringValue()
167     // Get the shift value for the bit field (how many bits to lop off of the end)  in ASN1GetBitStringValue()
169     length--;  in ASN1GetBitStringValue()
171     inputBits = (8 * length) - shift;  in ASN1GetBitStringValue()
175     for(; length > 1; length--)  in ASN1GetBitStringValue()
188         VERIFY(((value & (0xFF000000 << (8 - shift)))) == 0);  in ASN1GetBitStringValue()
189         value = (value << (8 - shift)) + (NEXT_OCTET(ctx) >> shift);  in ASN1GetBitStringValue()
194         value <<= (32 - inputBits);  in ASN1GetBitStringValue()
198     ctx->size = -1;  in ASN1GetBitStringValue()
208 // the things that will be at the end of the structure are added last. To manage the
210 // there is one, and then placing items in from the bottom up. If the bottom-most 
214 // The context control structure contains a 'buffer' pointer, an 'offset', an 'end'
219 // functions make sure that no data is written beyond the end of the buffer.
221 // When a new context is started, the current value of 'end' is pushed
222 // on the stack and 'end' is set to 'offset. As bytes are added, offset gets smaller.
223 // At any time, the count of bytes in the current context is simply 'end' - 'offset'.
225 // Since starting a new context involves setting 'end' = 'offset', the number of bytes
227 // 'end' - 'offset' to set the length value, and then a tag is added to the buffer. 
228 // Then the previous 'end' value is popped meaning that the context just ended 
233 // simple as the size of the move is the initial 'end' value minus the final 'offset'
242 // process executed again with the data going into the buffer. At the end, the data
255     ctx->buffer = buffer;  in ASN1InitialializeMarshalContext()
257         ctx->offset = length;  in ASN1InitialializeMarshalContext()
259         ctx->offset = INT16_MAX;  in ASN1InitialializeMarshalContext()
260     ctx->end = ctx->offset;  in ASN1InitialializeMarshalContext()
261     ctx->depth = -1;  in ASN1InitialializeMarshalContext()
272     pAssert((ctx->depth + 1) < MAX_DEPTH);  in ASN1StartMarshalContext()
273     ctx->depth++;  in ASN1StartMarshalContext()
274     ctx->ends[ctx->depth] = ctx->end;  in ASN1StartMarshalContext()
275     ctx->end = ctx->offset;  in ASN1StartMarshalContext()
279 // This function restores the end pointer for an encapsulating structure.
289     pAssert(ctx->depth >= 0);  in ASN1EndMarshalContext()
290     length = ctx->end - ctx->offset;  in ASN1EndMarshalContext()
291     ctx->end = ctx->ends[ctx->depth--];  in ASN1EndMarshalContext()
292     if((ctx->depth == -1) && (ctx->buffer))  in ASN1EndMarshalContext()
294         MemoryCopy(ctx->buffer, ctx->buffer + ctx->offset, ctx->end - ctx->offset);  in ASN1EndMarshalContext()
303 // are used, a byte of zero is prepended. If a raw bit-string is needed, a new
307 //      == 0        failure
317     ASN1PushTagAndLength(ctx, tag, ctx->end - ctx->offset);  in ASN1EndEncapsulation()
328     if(ctx->offset > 0)  in ASN1PushByte()
330         ctx->offset -= 1;  in ASN1PushByte()
331         if(ctx->buffer)  in ASN1PushByte()
332             ctx->buffer[ctx->offset] = b;  in ASN1PushByte()
335     ctx->offset = -1;  in ASN1PushByte()
343 //      == 0            failure unless count was zero
355     ctx->offset -= count;  in ASN1PushBytes()
357     VERIFY(ctx->offset >= 0);  in ASN1PushBytes()
360     if(count && buffer && ctx->buffer)  in ASN1PushBytes()
361         MemoryCopy(&ctx->buffer[ctx->offset], buffer, count);  in ASN1PushBytes()
364     ctx->offset = -1;  in ASN1PushBytes()
371 //      == 0            failure unless count was zero
379     return (ctx->offset >= 0) ? 2 : 0;  in ASN1PushNull()
386 //      == 0        failure
393     UINT16                       start = ctx->offset;  in ASN1PushLength()
411     ctx->offset = -1;  in ASN1PushLength()
413     return (ctx->offset > 0) ? start - ctx->offset : 0;  in ASN1PushLength()
419 //      == 0        failure
430     return (ctx->offset < 0) ? 0 : bytes;  in ASN1PushTagAndLength()
438 //      == 0        failure
455 // This function pushes an native-endian integer value. This just changes a
456 // native-endian integer into a big-endian byte string and calls ASN1PushInteger().
460 //      == 0            failure unless count was zero
473 // Push a big-endian integer on the end of the buffer 
476 //      == 0        failure
481     BYTE                *integer        // IN: big-endian integer  in ASN1PushInteger()
485     while((*integer == 0) && (--iLen > 0))  in ASN1PushInteger()
504 //      == 0        failure
515     ctx->offset = -1;  in ASN1PushOID()