本文整理汇总了C++中istream::readsome方法的典型用法代码示例。如果您正苦于以下问题：C++ istream::readsome方法的具体用法？C++ istream::readsome怎么用？C++ istream::readsome使用的例子？那么恭喜您, 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istream的用法示例。
在下文中一共展示了istream::readsome方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: readChar
static inline int readChar(istream& is) {
char b[1];
return (is.readsome(b, 1) == 1) ? b[0] : -1;
}示例2: read_next_file
bool read_next_file(istream& s, ZIPLocalFileHeader& fh)
{
char b[30];
if (s.readsome(b, 4) != 4)
THROW(("Truncated ePub file"));
if (b[0] != 'P' or b[1] != 'K')
THROW(("Invalid ePub file"));
if (b[2] == '0' and b[3] == '0') // split
THROW(("Split ePub archives are not supported"));
if ((b[2] == '\001' and b[3] == '\002') or // central directory
(b[2] == '\005' and b[3] == '\006')) // end of archive record
{
return false;
}
// now it must be a regular file entry, otherwise we bail out
if (not (b[2] == '\003' and b[3] == '\004'))
THROW(("Invalid ePub file, perhaps it is damaged"));
if (s.readsome(b + 4, sizeof(b) - 4) != sizeof(b) - 4)
THROW(("Truncated ePub file"));
uint16 versionNeededToExtract, bitFlag, compressionMethod, fileNameLength, extraFieldLength;
char* p = read(versionNeededToExtract, b + 4);
p = read(bitFlag, p);
p = read(compressionMethod, p);
p = read(fh.file_mod_time, p);
p = read(fh.file_mod_date, p);
p = read(fh.crc, p);
p = read(fh.compressed_size, p);
p = read(fh.uncompressed_size, p);
p = read(fileNameLength, p);
p = read(extraFieldLength, p);
// sanity checks
if (compressionMethod != 0 and compressionMethod != 8)
THROW(("Unsupported compression method used in ePub file"));
assert(p == b + sizeof(b));
// read file name
vector<char> fn(fileNameLength);
if (s.readsome(&fn[0], fileNameLength) != fileNameLength)
THROW(("Truncated ePub file"));
fh.filename.assign(&fn[0], fileNameLength);
// skip over the extra data
s.seekg(extraFieldLength, ios::cur);
// OK, now read in the data and inflate if required
fh.data.clear();
// save the offset in the stream to be able to seek back if needed
std::streamsize offset = s.tellg();
if (compressionMethod == 0) // no compression
{
if (fh.compressed_size > 0)
{
vector<char> b(fh.compressed_size);
if (s.readsome(&b[0], fh.compressed_size) != fh.compressed_size)
THROW(("Truncated ePub file"));
fh.data.assign(&b[0], fh.compressed_size);
}
}
else // inflate
{
if (fh.compressed_size == 0 and not (bitFlag & kZipLengthAtEndMask))
THROW(("Invalid ePub file, missing compressed size"));
// setup a boost::iostreams pair to read the compressed data
io::zlib_params params;
params.noheader = true; // don't read header, i.e. true deflate compression
params.calculate_crc = true;
io::zlib_decompressor z_stream(params);
io::filtering_streambuf<io::input> in;
in.push(z_stream);
in.push(s);
io::filtering_ostream out(io::back_inserter(fh.data));
io::copy(in, out);
s.seekg(offset + z_stream.filter().total_in(), ios::beg);
// now read the trailing length if needed
if (bitFlag & kZipLengthAtEndMask)
{
//.........这里部分代码省略.........