FormatterBuffer.c

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

  Zyan Disassembler Library (Zydis)

  Original Author : Florian Bernd

 * 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.

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

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

/* ============================================================================================== */
/* Exported functions                                                                             */
/* ============================================================================================== */

/* ---------------------------------------------------------------------------------------------- */
/* Token                                                                                          */
/* ---------------------------------------------------------------------------------------------- */

ZyanStatus ZydisFormatterTokenGetValue(const ZydisFormatterToken* token,
    ZydisTokenType* type, ZyanConstCharPointer* value)
{
    if (!token || !type || !value)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    *type = token->type;
    *value = (ZyanConstCharPointer)((ZyanU8*)token + sizeof(ZydisFormatterToken));

    return ZYAN_STATUS_SUCCESS;
}

ZyanStatus ZydisFormatterTokenNext(ZydisFormatterTokenConst** token)
{
    if (!token || !*token)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    const ZyanU8 next = (*token)->next;
    if (!next)
    {
        return ZYAN_STATUS_OUT_OF_RANGE;
    }
    *token = (ZydisFormatterTokenConst*)((ZyanU8*)*token + sizeof(ZydisFormatterToken) + next);

    return ZYAN_STATUS_SUCCESS;
}

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

ZyanStatus ZydisFormatterBufferGetToken(const ZydisFormatterBuffer* buffer,
    ZydisFormatterTokenConst** token)
{
    if (!buffer || !token)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    *token = ((ZydisFormatterTokenConst*)buffer->string.vector.data - 1);
    if ((*token)->type == ZYDIS_TOKEN_INVALID)
    {
        return ZYAN_STATUS_INVALID_OPERATION;
    }

    return ZYAN_STATUS_SUCCESS;
}

ZyanStatus ZydisFormatterBufferGetString(ZydisFormatterBuffer* buffer, ZyanString** string)
{
    if (!buffer || !string)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    if (buffer->is_token_list &&
        ((ZydisFormatterTokenConst*)buffer->string.vector.data - 1)->type == ZYDIS_TOKEN_INVALID)
    {
        return ZYAN_STATUS_INVALID_OPERATION;
    }

    ZYAN_ASSERT(buffer->string.vector.data);
    ZYAN_ASSERT(buffer->string.vector.size);

    *string = &buffer->string;

    return ZYAN_STATUS_SUCCESS;
}

ZyanStatus ZydisFormatterBufferAppend(ZydisFormatterBuffer* buffer, ZydisTokenType type)
{
    if (!buffer)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    if (!buffer->is_token_list)
    {
        return ZYAN_STATUS_SUCCESS;
    }

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

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

    const ZyanUSize delta = len + sizeof(ZydisFormatterToken);
    buffer->capacity -= delta;
    buffer->string.vector.data = (ZyanU8*)buffer->string.vector.data + delta;
    buffer->string.vector.size = 1;
    buffer->string.vector.capacity = ZYAN_MIN(buffer->capacity, 255);
    *(char*)buffer->string.vector.data = '\0';

    ZydisFormatterToken* const token = (ZydisFormatterToken*)buffer->string.vector.data - 1;
    token->type = type;
    token->next = 0;

    return ZYAN_STATUS_SUCCESS;
}

ZyanStatus ZydisFormatterBufferRemember(const ZydisFormatterBuffer* buffer, ZyanUPointer* state)
{
    if (!buffer || !state)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    if (buffer->is_token_list)
    {
        *state = (ZyanUPointer)buffer->string.vector.data;
    } else
    {
        *state = (ZyanUPointer)buffer->string.vector.size;
    }

    return ZYAN_STATUS_SUCCESS;
}

ZyanStatus ZydisFormatterBufferRestore(ZydisFormatterBuffer* buffer, ZyanUPointer state)
{
    if (!buffer)
    {
        return ZYAN_STATUS_INVALID_ARGUMENT;
    }

    if (buffer->is_token_list)
    {
        const ZyanUSize delta = (ZyanUPointer)buffer->string.vector.data - state;
        buffer->capacity += delta;
        buffer->string.vector.data = (void*)state;
        buffer->string.vector.size = 1; // TODO: Restore size?
        buffer->string.vector.capacity = ZYAN_MIN(buffer->capacity, 255);
        *(char*)buffer->string.vector.data = '\0';
    } else
    {
        buffer->string.vector.size = (ZyanUSize)state;
        ZYDIS_STRING_NULLTERMINATE(&buffer->string);
    }

    return ZYAN_STATUS_SUCCESS;
}

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

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