/*****************************************************************************/
/*                                                                           */
/*                                 gentype.c                                 */
/*                                                                           */
/*                        Generic data type encoding                         */
/*                                                                           */
/*                                                                           */
/*                                                                           */
/* (C) 2011,      Ullrich von Bassewitz                                      */
/*                Roemerstrasse 52                                           */
/*                D-70794 Filderstadt                                        */
/* EMail:         uz@cc65.org                                                */
/*                                                                           */
/*                                                                           */
/* This software is provided 'as-is', without any expressed or implied       */
/* warranty.  In no event will the authors be held liable for any damages    */
/* arising from the use of this software.                                    */
/*                                                                           */
/* Permission is granted to anyone to use this software for any purpose,     */
/* including commercial applications, and to alter it and redistribute it    */
/* freely, subject to the following restrictions:                            */
/*                                                                           */
/* 1. The origin of this software must not be misrepresented; you must not   */
/*    claim that you wrote the original software. If you use this software   */
/*    in a product, an acknowledgment in the product documentation would be  */
/*    appreciated but is not required.                                       */
/* 2. Altered source versions must be plainly marked as such, and must not   */
/*    be misrepresented as being the original software.                      */
/* 3. This notice may not be removed or altered from any source              */
/*    distribution.                                                          */
/*                                                                           */
/*****************************************************************************/



/* common */
#include "check.h"
#include "gentype.h"
#include "strbuf.h"



/*****************************************************************************/
/*                                   Code                                    */
/*****************************************************************************/



void GT_AddArray (StrBuf* Type, unsigned ArraySize)
/* Add an array with the given size to the type string in Type. This will
 * NOT add the element type!
 */
{
    unsigned SizeBytes;

    /* Remember the current position */
    unsigned Pos = SB_GetLen (Type);

    /* Add a dummy array token */
    SB_AppendChar (Type, GT_TYPE_ARRAY);

    /* Add the size. */
    SizeBytes = 0;
    do {
        SB_AppendChar (Type, ArraySize & 0xFF);
        ArraySize >>= 8;
        ++SizeBytes;
    } while (ArraySize);

    /* Write the correct array token */
    SB_GetBuf (Type)[Pos] = GT_ARRAY (SizeBytes);
}



unsigned GT_GetElementCount (StrBuf* Type)
/* Retrieve the element count of an array stored in Type at the current index
 * position. Note: Index must point to the array token itself, since the size
 * of the element count is encoded there. The index position will get moved
 * past the array.
 */
{
    /* Get the number of bytes for the element count */
    unsigned SizeBytes = GT_GET_SIZE (SB_Get (Type));

    /* Read the size */
    unsigned Size = 0;
    const char* Buf = SB_GetConstBuf (Type) + SB_GetLen (Type);
    while (SizeBytes--) {
        Size <<= 8;
        Size |= Buf[SizeBytes];
    }

    /* Return it */
    return Size;
}



const char* GT_AsString (const StrBuf* Type, StrBuf* String)
/* Convert the type into a readable representation. The target string buffer
 * will be zero terminated and a pointer to the contents are returned.
 */
{
    static const char HexTab[16] = "0123456789ABCDEF";
    unsigned I;

    /* Convert Type into readable hex. String will have twice then length
     * plus a terminator.
     */
    SB_Realloc (String, 2 * SB_GetLen (Type) + 1);
    SB_Clear (String);

    for (I = 0; I < SB_GetLen (Type); ++I) {
        unsigned char C = SB_AtUnchecked (Type, I);
        SB_AppendChar (String, HexTab[(C & 0xF0) >> 4]);
        SB_AppendChar (String, HexTab[(C & 0x0F) >> 0]);
    }

    /* Terminate the string so it can be used with string functions */
    SB_Terminate (String);

    /* Return the contents of String */
    return SB_GetConstBuf (String);
}