hasherezade-bearparser/parser/AbstractByteBuffer.cpp

#include "AbstractByteBuffer.h"

//--------------------------------------------------

const BYTE AbstractByteBuffer::operator[](std::size_t idx)
{
    bufsize_t offset = static_cast<bufsize_t>(idx);
    if (offset >= getContentSize() ) {
        throw BufferException("Too far offset requested!");
    }
    return this->getContent()[idx];
}

offset_t AbstractByteBuffer::getOffset(BYTE *ptr,  bool allowExceptions)
{
    if (ptr == NULL) return INVALID_ADDR;

    BYTE* buf = this->getContent();
    bufsize_t bufSize = this->getContentSize();

    if (buf == NULL || bufSize == 0) {
        if (allowExceptions) throw BufferException("Buffer if empty!");
        return INVALID_ADDR;
    }

    if (ptr < buf) {
        if (allowExceptions) throw BufferException("Pointer before buffer begining!");
        return INVALID_ADDR;
    }
    offset_t offset = ptr - buf;
    if (offset >= bufSize) {
        if (allowExceptions) throw BufferException("Pointer does not belong to buffer!");
        return INVALID_ADDR;
    }
    return offset;
}

BYTE* AbstractByteBuffer::getContentAt(offset_t offset, bufsize_t size, bool allowExceptions)
{
    bufsize_t fileSize = this->getContentSize();
    BYTE* buf = this->getContent();
    if (buf == NULL) return NULL;

    if (offset >= fileSize ) {
        if (allowExceptions) throw BufferException("Too far offset requested!");
        return NULL;
    }

    if (offset + size > fileSize) {
        if (allowExceptions) throw BufferException("Too big size requested!");
        return NULL;
    }
    BYTE *cntnt = buf + offset;
    return cntnt;
}

BYTE* AbstractByteBuffer::getContentAtPtr(BYTE *ptr, bufsize_t size, bool allowExceptions)
{
    offset_t offset = getOffset(ptr, allowExceptions);
    if (offset == INVALID_ADDR) return NULL;

    return getContentAt(offset, size, allowExceptions);
}

bool AbstractByteBuffer::setBufferedValue(BYTE *dstPtr, BYTE *srcPtr, bufsize_t srcSize, bufsize_t paddingSize, bool allowExceptions)
{
    if (dstPtr == srcPtr) return false;
    if (dstPtr == NULL || srcPtr == NULL) return false;

    offset_t srcStart = getOffset(srcPtr);
    if (srcStart == INVALID_ADDR) {
        if (allowExceptions) throw BufferException("Invalid copy destination!");
        return false;
    }
    bufsize_t size = srcSize + paddingSize;

    bufsize_t dstMaxSize = static_cast<bufsize_t>(getContentSize() - srcStart);
    if (dstMaxSize < size) {
        //throw BufferException("Cannot copy: too big content size!");
        size = dstMaxSize;
    }

    if (memcmp(dstPtr, srcPtr, size) == 0) {
        return false; //no changes required
    }
    if (paddingSize != 0) { //add padding
        memset(dstPtr, 0, size);
    }
    memcpy(dstPtr, srcPtr, srcSize);
    return true;
}

bool AbstractByteBuffer::fillContent(BYTE filling)
{
    bufsize_t bufSize = this->getContentSize();
    BYTE* buf = this->getContent();

    if (buf == NULL) return false;

    memset(buf, filling, bufSize);
    return true;
}

 bool AbstractByteBuffer::containsBlock(offset_t rawOffset, bufsize_t size)
{
    if (rawOffset == INVALID_ADDR || size == 0) return false;

    BYTE *ptr = (BYTE*) this->getContent();
    if (ptr == NULL) return false;

    offset_t startOffset = this->getOffset(ptr);
    if (startOffset == INVALID_ADDR) return false;

    offset_t endOffset = startOffset + this->getContentSize();

    offset_t srchdEnd = rawOffset + size;
    if (rawOffset >= startOffset && srchdEnd <= endOffset) {
        //printf("Fount in bounds: %x - %x block: %x-%x\n", startOffset, endOffset, rawOffset, srchdEnd);
        return true;
    }
    return false;
}

bool AbstractByteBuffer::intersectsBlock(offset_t rawOffset, bufsize_t size)
{
    if (rawOffset == INVALID_ADDR || size == 0) return false;

    BYTE *ptr = (BYTE*) this->getContent();
    if (ptr == NULL) return false;

    offset_t startOffset = this->getOffset(ptr);
    if (startOffset == INVALID_ADDR) return false;

    offset_t endOffset = startOffset + this->getContentSize();

    offset_t srchdEnd = rawOffset + size;
    if (rawOffset >= startOffset && rawOffset <= endOffset) {
        //printf("Fount in bounds: %x - %x start: %x\n", startOffset, endOffset, rawOffset);
        return true;
    }
    if (srchdEnd >= startOffset && srchdEnd <= endOffset) {
        //printf("Fount in bounds: %x - %x end: %x\n", startOffset, endOffset, endOffset);
        return true;
    }
    return false;
}

uint64_t AbstractByteBuffer::getNumValue(offset_t offset, bufsize_t size, bool* isOk)
{
    if (isOk) (*isOk) = false;
    if (size == 0 || offset == INVALID_ADDR) return (-1);

    void* ptr = this->getContentAt(offset, size);
    if (ptr == NULL) {
        return (-1);
    }
    uint64_t val = (-1);

    if (size == sizeof(uint8_t)) val = *((uint8_t*) ptr);
    else if (size == sizeof(uint16_t)) val = *((uint16_t*) ptr);
    else if (size == sizeof(uint32_t)) val = *((uint32_t*) ptr);
    else if (size == sizeof(uint64_t)) val = *((uint64_t*) ptr);
    else {
        return (-1);
    }
    if (isOk) (*isOk) = true;
    return val;
}

bool AbstractByteBuffer::setNumValue(offset_t offset, bufsize_t size, uint64_t newVal)
{
    if (size == 0 || offset == INVALID_ADDR) return false;
    void* ptr = this->getContentAt(offset, size);
        if (ptr == NULL) {
        return false;
    }


    if (size == sizeof(uint8_t)) {
        uint8_t nVal = newVal;
        uint8_t* valPtr = (uint8_t*) ptr;
        if ((*valPtr) == nVal) return false;
        (*valPtr) = nVal;
    }
    else if (size == sizeof(uint16_t)) {
        uint16_t nVal = newVal;
        uint16_t* valPtr = (uint16_t*) ptr;
        if ((*valPtr) == nVal) return false;
        (*valPtr) = nVal;
    }
    else if (size == sizeof(uint32_t)) {
        uint32_t nVal = newVal;
        uint32_t* valPtr = (uint32_t*) ptr;
        if ((*valPtr) == nVal) return false;
        (*valPtr) = nVal;
    }
    else if (size == sizeof(uint64_t)) {
        uint64_t nVal = newVal;
        uint64_t* valPtr = (uint64_t*) ptr;
        if ((*valPtr) == nVal) return false;
        (*valPtr) = nVal;
    } else return false;

    return true;
}