FormatterBase.h

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/***************************************************************************************************

  Zyan Disassembler Library (Zydis)

  Original Author : Florian Bernd, Joel Hoener

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.

***************************************************************************************************/

#ifndef ZYDIS_FORMATTER_BASE_H
#define ZYDIS_FORMATTER_BASE_H

#include <Zydis/Formatter.h>
#include <Zydis/Internal/String.h>

#ifdef __cplusplus
extern "C" {
#endif

/* ============================================================================================== */
/* Macros                                                                                         */
/* ============================================================================================== */

/* ---------------------------------------------------------------------------------------------- */
/* String                                                                                         */
/* ---------------------------------------------------------------------------------------------- */

#define ZYDIS_STRING_APPEND_NUM_U(formatter, base, str, value, padding_length, \
    force_leading_number) \
    switch (base) \
    { \
    case ZYDIS_NUMERIC_BASE_DEC: \
        ZYAN_CHECK(ZydisStringAppendDecU(str, value, padding_length, \
            (formatter)->number_format[base][0].string, \
            (formatter)->number_format[base][1].string)); \
        break; \
    case ZYDIS_NUMERIC_BASE_HEX: \
        ZYAN_CHECK(ZydisStringAppendHexU(str, value, padding_length, force_leading_number, \
            (formatter)->hex_uppercase, \
            (formatter)->number_format[base][0].string, \
            (formatter)->number_format[base][1].string)); \
        break; \
    default: \
        return ZYAN_STATUS_INVALID_ARGUMENT; \
    }

#define ZYDIS_STRING_APPEND_NUM_S(formatter, base, str, value, padding_length, \
    force_leading_number, force_sign) \
    switch (base) \
    { \
    case ZYDIS_NUMERIC_BASE_DEC: \
        ZYAN_CHECK(ZydisStringAppendDecS(str, value, padding_length, force_sign, \
            (formatter)->number_format[base][0].string, \
            (formatter)->number_format[base][1].string)); \
        break; \
    case ZYDIS_NUMERIC_BASE_HEX: \
        ZYAN_CHECK(ZydisStringAppendHexS(str, value, padding_length, force_leading_number,  \
            (formatter)->hex_uppercase, force_sign, \
            (formatter)->number_format[base][0].string, \
            (formatter)->number_format[base][1].string)); \
        break; \
    default: \
        return ZYAN_STATUS_INVALID_ARGUMENT; \
    }

/* ---------------------------------------------------------------------------------------------- */
/* Buffer                                                                                         */
/* ---------------------------------------------------------------------------------------------- */

#define ZYDIS_BUFFER_APPEND_TOKEN(buffer, type) \
    if ((buffer)->is_token_list) \
    { \
        ZYAN_CHECK(ZydisFormatterBufferAppend(buffer, type)); \
    }

#define ZYDIS_BUFFER_REMEMBER(buffer, state) \
    if ((buffer)->is_token_list) \
    { \
        (state) = (ZyanUPointer)(buffer)->string.vector.data; \
    } else \
    { \
        (state) = (ZyanUPointer)(buffer)->string.vector.size; \
    }

#define ZYDIS_BUFFER_APPEND(buffer, name) \
    if ((buffer)->is_token_list) \
    { \
        ZYAN_CHECK(ZydisFormatterBufferAppendPredefined(buffer, TOK_ ## name)); \
    } else \
    { \
        ZYAN_CHECK(ZydisStringAppendShort(&buffer->string, &STR_ ## name)); \
    }

// TODO: Implement `letter_case` for predefined tokens

#define ZYDIS_BUFFER_APPEND_CASE(buffer, name, letter_case) \
    if ((buffer)->is_token_list) \
    { \
        ZYAN_CHECK(ZydisFormatterBufferAppendPredefined(buffer, TOK_ ## name)); \
    } else \
    { \
        ZYAN_CHECK(ZydisStringAppendShortCase(&buffer->string, &STR_ ## name, letter_case)); \
    }

/* ---------------------------------------------------------------------------------------------- */

/* ============================================================================================== */
/* Helper functions                                                                               */
/* ============================================================================================== */

/* ---------------------------------------------------------------------------------------------- */
/* Buffer                                                                                         */
/* ---------------------------------------------------------------------------------------------- */

// MSVC does not like the C99 flexible-array extension
#ifdef ZYAN_MSVC
#   pragma warning(push)
#   pragma warning(disable:4200)
#endif

#pragma pack(push, 1)

typedef struct ZydisPredefinedToken_
{
    ZyanU8 size;
    ZyanU8 next;
    ZyanU8 data[];
} ZydisPredefinedToken;

#pragma pack(pop)

#ifdef ZYAN_MSVC
#   pragma warning(pop)
#endif

ZYAN_INLINE ZyanStatus ZydisFormatterBufferAppendPredefined(ZydisFormatterBuffer* buffer,
    const ZydisPredefinedToken* data)
{
    ZYAN_ASSERT(buffer);
    ZYAN_ASSERT(data);

    const ZyanUSize len = buffer->string.vector.size;
    ZYAN_ASSERT((len > 0) && (len < 256));
    if (buffer->capacity <= len + data->size)
    {
        return ZYAN_STATUS_INSUFFICIENT_BUFFER_SIZE;
    }

    ZydisFormatterToken* const last = (ZydisFormatterToken*)buffer->string.vector.data - 1;
    last->next = (ZyanU8)len;

    ZYAN_MEMCPY((ZyanU8*)buffer->string.vector.data + len, &data->data[0], data->size);

    const ZyanUSize delta = len + data->next;
    buffer->capacity -= delta;
    buffer->string.vector.data = (ZyanU8*)buffer->string.vector.data + delta;
    buffer->string.vector.size = data->size - data->next;
    buffer->string.vector.capacity = ZYAN_MIN(buffer->capacity, 255);

    return ZYAN_STATUS_SUCCESS;
}

/* ---------------------------------------------------------------------------------------------- */
/* General                                                                                        */
/* ---------------------------------------------------------------------------------------------- */

ZyanU32 ZydisFormatterHelperGetExplicitSize(const ZydisFormatter* formatter,
    ZydisFormatterContext* context, const ZydisDecodedOperand* operand);

/* ---------------------------------------------------------------------------------------------- */

/* ============================================================================================== */
/* Formatter functions                                                                            */
/* ============================================================================================== */

/* ---------------------------------------------------------------------------------------------- */
/* Operands                                                                                       */
/* ---------------------------------------------------------------------------------------------- */

ZyanStatus ZydisFormatterBaseFormatOperandREG(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

ZyanStatus ZydisFormatterBaseFormatOperandPTR(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

ZyanStatus ZydisFormatterBaseFormatOperandIMM(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

/* ---------------------------------------------------------------------------------------------- */
/* Elemental tokens                                                                               */
/* ---------------------------------------------------------------------------------------------- */

ZyanStatus ZydisFormatterBasePrintAddressABS(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

ZyanStatus ZydisFormatterBasePrintAddressREL(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

ZyanStatus ZydisFormatterBasePrintIMM(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

/* ---------------------------------------------------------------------------------------------- */
/* Optional tokens                                                                                */
/* ---------------------------------------------------------------------------------------------- */

ZyanStatus ZydisFormatterBasePrintSegment(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

ZyanStatus ZydisFormatterBasePrintPrefixes(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context);

ZyanStatus ZydisFormatterBasePrintDecorator(const ZydisFormatter* formatter,
    ZydisFormatterBuffer* buffer, ZydisFormatterContext* context, ZydisDecorator decorator);

/* ---------------------------------------------------------------------------------------------- */

/* ============================================================================================== */

#ifdef __cplusplus
}
#endif

#endif // ZYDIS_FORMATTER_BASE_H