本文整理汇总了C++中DataBuf::alloc方法的典型用法代码示例。如果您正苦于以下问题：C++ DataBuf::alloc方法的具体用法？C++ DataBuf::alloc怎么用？C++ DataBuf::alloc使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类DataBuf的用法示例。
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示例1: zlibUncompress
void PngChunk::zlibUncompress(const byte* compressedText,
unsigned int compressedTextSize,
DataBuf& arr)
{
uLongf uncompressedLen = compressedTextSize * 2; // just a starting point
int zlibResult;
do
{
arr.alloc(uncompressedLen);
zlibResult = uncompress((Bytef*)arr.pData_, &uncompressedLen,
compressedText, compressedTextSize);
if (zlibResult == Z_OK)
{
// then it is all OK
arr.alloc(uncompressedLen);
}
else if (zlibResult == Z_BUF_ERROR)
{
// the uncompressedArray needs to be larger
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::parsePngChunk: doubling size for decompression.\n";
#endif
uncompressedLen *= 2;
// DoS protection. can't be bigger than 64k
if ( uncompressedLen > 131072 )
break;
}
else
{
// something bad happened
throw Error(14);
}
}
while (zlibResult == Z_BUF_ERROR);
if (zlibResult != Z_OK)
throw Error(14);
} // PngChunk::zlibUncompress示例2: writeMetadata
void TiffImage::writeMetadata()
{
#ifdef DEBUG
std::cerr << "Writing TIFF file " << io_->path() << "\n";
#endif
// Read existing image
ByteOrder bo = byteOrder();
DataBuf buf;
if (io_->open() == 0) {
IoCloser closer(*io_);
// Ensure that this is the correct image type
if (isTiffType(*io_, false)) {
// Read the image into a memory buffer
buf.alloc(io_->size());
io_->read(buf.pData_, buf.size_);
if (io_->error() || io_->eof()) {
buf.reset();
}
TiffHeader tiffHeader;
if (0 == tiffHeader.read(buf.pData_, 8)) {
bo = tiffHeader.byteOrder();
}
}
}
if (bo == invalidByteOrder) {
bo = littleEndian;
}
setByteOrder(bo);
Blob blob;
WriteMethod wm = TiffParser::encode(blob,
buf.pData_,
buf.size_,
bo,
exifData_,
iptcData_,
xmpData_);
// Write updated or new buffer to file
BasicIo::AutoPtr tempIo(io_->temporary()); // may throw
assert(tempIo.get() != 0);
if (wm == wmNonIntrusive) {
// Buffer may be modified but size is unchanged, write buffer back
tempIo->write(buf.pData_, buf.size_);
}
else {
// Size of the buffer changed, write from blob
tempIo->write(&blob[0], static_cast<long>(blob.size()));
}
io_->close();
io_->transfer(*tempIo); // may throw
} // TiffImage::writeMetadata示例3: nikonCrypt
DataBuf nikonCrypt(uint16_t tag, const byte* pData, uint32_t size, TiffComponent* const pRoot)
{
DataBuf buf;
if (size < 4) return buf;
const NikonArrayIdx* nci = find(nikonArrayIdx, NikonArrayIdx::Key(tag, reinterpret_cast<const char*>(pData), size));
if (nci == 0 || nci->start_ == NA || size <= nci->start_) return buf;
// Find Exif.Nikon3.ShutterCount
TiffFinder finder(0x00a7, nikon3Id);
pRoot->accept(finder);
TiffEntryBase* te = dynamic_cast<TiffEntryBase*>(finder.result());
if (!te || !te->pValue() || te->pValue()->count() == 0) return buf;
uint32_t count = static_cast<uint32_t>(te->pValue()->toLong());
// Find Exif.Nikon3.SerialNumber
finder.init(0x001d, nikon3Id);
pRoot->accept(finder);
te = dynamic_cast<TiffEntryBase*>(finder.result());
if (!te || !te->pValue() || te->pValue()->count() == 0) return buf;
bool ok(false);
uint32_t serial = stringTo<uint32_t>(te->pValue()->toString(), ok);
if (!ok) {
std::string model = getExifModel(pRoot);
if (model.empty()) return buf;
if (model.find("D50") != std::string::npos) {
serial = 0x22;
}
else {
serial = 0x60;
}
}
buf.alloc(size);
memcpy(buf.pData_, pData, buf.size_);
ncrypt(buf.pData_ + nci->start_, buf.size_ - nci->start_, count, serial);
return buf;
}示例4: Error
void Jp2Image::readMetadata()
{
#ifdef DEBUG
std::cerr << "Exiv2::Jp2Image::readMetadata: Reading JPEG-2000 file " << io_->path() << "\n";
#endif
if (io_->open() != 0)
{
throw Error(9, io_->path(), strError());
}
IoCloser closer(*io_);
// Ensure that this is the correct image type
if (!isJp2Type(*io_, true))
{
if (io_->error() || io_->eof()) throw Error(14);
throw Error(3, "JPEG-2000");
}
long position = 0;
Jp2BoxHeader box = {0,0};
Jp2BoxHeader subBox = {0,0};
Jp2ImageHeaderBox ihdr = {0,0,0,0,0,0,0,0};
Jp2UuidBox uuid = {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}};
while (io_->read((byte*)&box, sizeof(box)) == sizeof(box))
{
position = io_->tell();
box.boxLength = getLong((byte*)&box.boxLength, bigEndian);
#ifdef DEBUG
std::cout << "Exiv2::Jp2Image::readMetadata: Position: " << position << "\n";
std::cout << "Exiv2::Jp2Image::readMetadata: Find box type: " << std::string((const char*)&box.boxType)
<< " lenght: " << box.boxLength << "\n";
#endif
box.boxType = getLong((byte*)&box.boxType, bigEndian);
if (box.boxLength == 0)
{
#ifdef DEBUG
std::cout << "Exiv2::Jp2Image::readMetadata: Null Box size has been found. "
"This is the last box of file.\n";
#endif
return;
}
if (box.boxLength == 1)
{
// FIXME. Special case. the real box size is given in another place.
}
switch(box.boxType)
{
case kJp2BoxTypeJp2Header:
{
#ifdef DEBUG
std::cout << "Exiv2::Jp2Image::readMetadata: JP2Header box found\n";
#endif
if (io_->read((byte*)&subBox, sizeof(subBox)) == sizeof(subBox))
{
subBox.boxLength = getLong((byte*)&subBox.boxLength, bigEndian);
subBox.boxType = getLong((byte*)&subBox.boxType, bigEndian);
if((subBox.boxType == kJp2BoxTypeImageHeader) &&
(io_->read((byte*)&ihdr, sizeof(ihdr)) == sizeof(ihdr)))
{
#ifdef DEBUG
std::cout << "Exiv2::Jp2Image::readMetadata: Ihdr data found\n";
#endif
ihdr.imageHeight = getLong((byte*)&ihdr.imageHeight, bigEndian);
ihdr.imageWidth = getLong((byte*)&ihdr.imageWidth, bigEndian);
ihdr.componentCount = getShort((byte*)&ihdr.componentCount, bigEndian);
ihdr.compressionTypeProfile = getShort((byte*)&ihdr.compressionTypeProfile, bigEndian);
pixelWidth_ = ihdr.imageWidth;
pixelHeight_ = ihdr.imageHeight;
}
}
break;
}
case kJp2BoxTypeUuid:
{
#ifdef DEBUG
std::cout << "Exiv2::Jp2Image::readMetadata: UUID box found\n";
#endif
if (io_->read((byte*)&uuid, sizeof(uuid)) == sizeof(uuid))
{
DataBuf rawData;
long bufRead;
if(memcmp(uuid.uuid, kJp2UuidExif, sizeof(uuid)) == 0)
{
#ifdef DEBUG
std::cout << "Exiv2::Jp2Image::readMetadata: Exif data found\n";
#endif
// we've hit an embedded Exif block
rawData.alloc(box.boxLength - (sizeof(box) + sizeof(uuid)));
bufRead = io_->read(rawData.pData_, rawData.size_);
if (io_->error()) throw Error(14);
//.........这里部分代码省略.........
示例5: doWriteMetadata
void JpegBase::doWriteMetadata(BasicIo& outIo)
{
if (!io_->isopen()) throw Error(20);
if (!outIo.isopen()) throw Error(21);
// Ensure that this is the correct image type
if (!isThisType(*io_, true)) {
if (io_->error() || io_->eof()) throw Error(20);
throw Error(22);
}
const long bufMinSize = 36;
long bufRead = 0;
DataBuf buf(bufMinSize);
const long seek = io_->tell();
int count = 0;
int search = 0;
int insertPos = 0;
int comPos = 0;
int skipApp1Exif = -1;
int skipApp1Xmp = -1;
int skipApp13Ps3 = -1;
int skipCom = -1;
DataBuf psData;
DataBuf rawExif;
// Write image header
if (writeHeader(outIo)) throw Error(21);
// Read section marker
int marker = advanceToMarker();
if (marker < 0) throw Error(22);
// First find segments of interest. Normally app0 is first and we want
// to insert after it. But if app0 comes after com, app1 and app13 then
// don't bother.
while (marker != sos_ && marker != eoi_ && search < 5) {
// Read size and signature (ok if this hits EOF)
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(20);
uint16_t size = getUShort(buf.pData_, bigEndian);
if (marker == app0_) {
if (size < 2) throw Error(22);
insertPos = count + 1;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else if ( skipApp1Exif == -1
&& marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
if (size < 8) throw Error(22);
skipApp1Exif = count;
++search;
// Seek to beginning and read the current Exif data
io_->seek(8 - bufRead, BasicIo::cur);
rawExif.alloc(size - 8);
io_->read(rawExif.pData_, rawExif.size_);
if (io_->error() || io_->eof()) throw Error(22);
}
else if (marker == app1_ && memcmp(buf.pData_ + 2, xmpId_, 29) == 0) {
if (size < 31) throw Error(22);
skipApp1Xmp = count;
++search;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else if (marker == app13_ && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
#ifdef DEBUG
std::cerr << "Found APP13 Photoshop PS3 segment\n";
#endif
if (size < 16) throw Error(22);
skipApp13Ps3 = count;
++search;
io_->seek(16 - bufRead, BasicIo::cur);
psData.alloc(size - 16);
// Load PS data now to allow reinsertion at any point
io_->read(psData.pData_, size - 16);
if (io_->error() || io_->eof()) throw Error(20);
}
else if (marker == com_ && skipCom == -1) {
if (size < 2) throw Error(22);
// Jpegs can have multiple comments, but for now only handle
// the first one (most jpegs only have one anyway).
skipCom = count;
++search;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else {
if (size < 2) throw Error(22);
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
// As in jpeg-6b/wrjpgcom.c:
// We will insert the new comment marker just before SOFn.
// This (a) causes the new comment to appear after, rather than before,
// existing comments; and (b) ensures that comments come after any JFIF
// or JFXX markers, as required by the JFIF specification.
if ( comPos == 0
&& ( marker == sof0_
|| marker == sof1_
|| marker == sof2_
|| marker == sof3_
|| marker == sof5_
//.........这里部分代码省略.........
示例6: readRawProfile
DataBuf PngChunk::readRawProfile(const DataBuf& text)
{
DataBuf info;
register long i;
register unsigned char *dp;
const char *sp;
unsigned int nibbles;
long length;
unsigned char unhex[103]={0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1, 2,3,4,5,6,7,8,9,0,0,
0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,10,11,12,
13,14,15};
sp = (char*)text.pData_+1;
// Look for newline
while (*sp != '\n')
sp++;
// Look for length
while (*sp == '\0' || *sp == ' ' || *sp == '\n')
sp++;
length = (long) atol(sp);
while (*sp != ' ' && *sp != '\n')
sp++;
// Allocate space
if (length == 0)
{
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::readRawProfile: Unable To Copy Raw Profile: invalid profile length\n";
#endif
return DataBuf();
}
info.alloc(length);
if (info.size_ != length)
{
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::readRawProfile: Unable To Copy Raw Profile: cannot allocate memory\n";
#endif
return DataBuf();
}
// Copy profile, skipping white space and column 1 "=" signs
dp = (unsigned char*)info.pData_;
nibbles = length * 2;
for (i = 0; i < (long) nibbles; i++)
{
while (*sp < '0' || (*sp > '9' && *sp < 'a') || *sp > 'f')
{
if (*sp == '\0')
{
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::readRawProfile: Unable To Copy Raw Profile: ran out of data\n";
#endif
return DataBuf();
}
sp++;
}
if (i%2 == 0)
*dp = (unsigned char) (16*unhex[(int) *sp++]);
else
(*dp++) += unhex[(int) *sp++];
}
return info;
} // PngChunk::readRawProfile示例7: parsePngChunk
DataBuf PngChunk::parsePngChunk(const byte* pData, long size, long& index, int keysize)
{
DataBuf arr;
if(!strncmp((char*)PNG_CHUNK_TYPE(pData, index), "zTXt", 4))
{
// Extract a deflate compressed Latin-1 text chunk
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::parsePngChunk: We found a zTXt field\n";
#endif
// we get the compression method after the key
const byte* compressionMethod = &PNG_CHUNK_DATA(pData, index, keysize+1);
if ( *compressionMethod != 0x00 )
{
// then it isn't zlib compressed and we are sunk
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::parsePngChunk: Non-standard zTXt compression method.\n";
#endif
throw Error(14);
}
// compressed string after the compression technique spec
const byte* compressedText = &PNG_CHUNK_DATA(pData, index, keysize+2);
unsigned int compressedTextSize = getLong(&pData[index], bigEndian)-keysize-2;
// security check, also considering overflow wraparound from the addition --
// we may endup with a /smaller/ index if we wrap all the way around
long firstIndex = (long)(compressedText - pData);
long onePastLastIndex = firstIndex + compressedTextSize;
if ( onePastLastIndex > size || onePastLastIndex <= firstIndex)
throw Error(14);
zlibUncompress(compressedText, compressedTextSize, arr);
}
else if (!strncmp((char*)PNG_CHUNK_TYPE(pData, index), "tEXt", 4))
{
// Extract a non-compressed Latin-1 text chunk
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::parsePngChunk: We found a tEXt field\n";
#endif
// the text comes after the key, but isn't null terminated
const byte* text = &PNG_CHUNK_DATA(pData, index, keysize+1);
long textsize = getLong(&pData[index], bigEndian)-keysize-1;
// security check, also considering overflow wraparound from the addition --
// we may endup with a /smaller/ index if we wrap all the way around
long firstIndex = (long)(text - pData);
long onePastLastIndex = firstIndex + textsize;
if ( onePastLastIndex > size || onePastLastIndex <= firstIndex)
throw Error(14);
arr.alloc(textsize);
arr = DataBuf(text, textsize);
}
else if(!strncmp((char*)PNG_CHUNK_TYPE(pData, index), "iTXt", 4))
{
// Extract a deflate compressed or uncompressed UTF-8 text chunk
// we get the compression flag after the key
const byte* compressionFlag = &PNG_CHUNK_DATA(pData, index, keysize+1);
// we get the compression method after the compression flag
const byte* compressionMethod = &PNG_CHUNK_DATA(pData, index, keysize+1);
// language description string after the compression technique spec
const byte* languageText = &PNG_CHUNK_DATA(pData, index, keysize+1);
unsigned int languageTextSize = getLong(&pData[index], bigEndian)-keysize-1;
// translated keyword string after the language description
const byte* translatedKeyText = &PNG_CHUNK_DATA(pData, index, keysize+1);
unsigned int translatedKeyTextSize = getLong(&pData[index], bigEndian)-keysize-1;
if ( *compressionFlag == 0x00 )
{
// then it's an uncompressed iTXt chunk
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::parsePngChunk: We found an uncompressed iTXt field\n";
#endif
// the text comes after the translated keyword, but isn't null terminated
const byte* text = &PNG_CHUNK_DATA(pData, index, keysize+1);
long textsize = getLong(&pData[index], bigEndian)-keysize-1;
// security check, also considering overflow wraparound from the addition --
// we may endup with a /smaller/ index if we wrap all the way around
long firstIndex = (long)(text - pData);
long onePastLastIndex = firstIndex + textsize;
if ( onePastLastIndex > size || onePastLastIndex <= firstIndex)
throw Error(14);
arr.alloc(textsize);
arr = DataBuf(text, textsize);
}
else if ( *compressionMethod == 0x00 )
{
// then it's a zlib compressed iTXt chunk
#ifdef DEBUG
std::cerr << "Exiv2::PngChunk::parsePngChunk: We found a zlib compressed iTXt field\n";
#endif
//.........这里部分代码省略.........
示例8: transfer
void FileIo::transfer(BasicIo& src)
{
const bool wasOpen = (p_->fp_ != 0);
const std::string lastMode(p_->openMode_);
FileIo *fileIo = dynamic_cast<FileIo*>(&src);
if (fileIo) {
// Optimization if src is another instance of FileIo
fileIo->close();
// Check if the file can be written to, if it already exists
if (open("a+b") != 0) {
// Remove the (temporary) file
#ifdef EXV_UNICODE_PATH
if (fileIo->p_->wpMode_ == Impl::wpUnicode) {
::_wremove(fileIo->wpath().c_str());
}
else
#endif
{
::remove(fileIo->path().c_str());
}
#ifdef EXV_UNICODE_PATH
if (p_->wpMode_ == Impl::wpUnicode) {
throw WError(10, wpath(), "a+b", strError().c_str());
}
else
#endif
{
throw Error(10, path(), "a+b", strError());
}
}
close();
bool statOk = true;
mode_t origStMode = 0;
std::string spf;
char* pf = 0;
#ifdef EXV_UNICODE_PATH
std::wstring wspf;
wchar_t* wpf = 0;
if (p_->wpMode_ == Impl::wpUnicode) {
wspf = wpath();
wpf = const_cast<wchar_t*>(wspf.c_str());
}
else
#endif
{
spf = path();
pf = const_cast<char*>(spf.c_str());
}
// Get the permissions of the file, or linked-to file, on platforms which have lstat
#ifdef EXV_HAVE_LSTAT
# ifdef EXV_UNICODE_PATH
# error EXV_UNICODE_PATH and EXV_HAVE_LSTAT are not compatible. Stop.
# endif
struct stat buf1;
if (::lstat(pf, &buf1) == -1) {
statOk = false;
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << Error(2, pf, strError(), "::lstat") << "\n";
#endif
}
origStMode = buf1.st_mode;
DataBuf lbuf; // So that the allocated memory is freed. Must have same scope as pf
// In case path() is a symlink, get the path of the linked-to file
if (statOk && S_ISLNK(buf1.st_mode)) {
lbuf.alloc(buf1.st_size + 1);
memset(lbuf.pData_, 0x0, lbuf.size_);
pf = reinterpret_cast<char*>(lbuf.pData_);
if (::readlink(path().c_str(), pf, lbuf.size_ - 1) == -1) {
throw Error(2, path(), strError(), "readlink");
}
// We need the permissions of the file, not the symlink
if (::stat(pf, &buf1) == -1) {
statOk = false;
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << Error(2, pf, strError(), "::stat") << "\n";
#endif
}
origStMode = buf1.st_mode;
}
#else // EXV_HAVE_LSTAT
Impl::StructStat buf1;
if (p_->stat(buf1) == -1) {
statOk = false;
}
origStMode = buf1.st_mode;
#endif // !EXV_HAVE_LSTAT
// MSVCRT rename that does not overwrite existing files
#ifdef EXV_UNICODE_PATH
if (p_->wpMode_ == Impl::wpUnicode) {
if (fileExists(wpf) && ::_wremove(wpf) != 0) {
throw WError(2, wpf, strError().c_str(), "::_wremove");
}
if (::_wrename(fileIo->wpath().c_str(), wpf) == -1) {
throw WError(17, fileIo->wpath(), wpf, strError().c_str());
}
//.........这里部分代码省略.........