mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-27 05:55:02 +03:00
449 lines
13 KiB
C++
449 lines
13 KiB
C++
#include "util/read_compressed.hh"
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#include "util/file.hh"
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#include "util/have.hh"
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#include "util/scoped.hh"
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#include <algorithm>
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#include <iostream>
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#include <assert.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_ZLIB
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#include <zlib.h>
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#endif
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#ifdef HAVE_BZLIB
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#include <bzlib.h>
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#endif
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#ifdef HAVE_XZLIB
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#include <lzma.h>
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#endif
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namespace util {
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CompressedException::CompressedException() throw() {}
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CompressedException::~CompressedException() throw() {}
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GZException::GZException() throw() {}
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GZException::~GZException() throw() {}
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BZException::BZException() throw() {}
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BZException::~BZException() throw() {}
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XZException::XZException() throw() {}
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XZException::~XZException() throw() {}
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class ReadBase {
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public:
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virtual ~ReadBase() {}
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virtual std::size_t Read(void *to, std::size_t amount, ReadCompressed &thunk) = 0;
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protected:
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static void ReplaceThis(ReadBase *with, ReadCompressed &thunk) {
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thunk.internal_.reset(with);
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}
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ReadBase *Current(ReadCompressed &thunk) { return thunk.internal_.get(); }
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static uint64_t &ReadCount(ReadCompressed &thunk) {
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return thunk.raw_amount_;
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}
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};
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namespace {
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ReadBase *ReadFactory(int fd, uint64_t &raw_amount, const void *already_data, std::size_t already_size, bool require_compressed);
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// Completed file that other classes can thunk to.
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class Complete : public ReadBase {
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public:
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std::size_t Read(void *, std::size_t, ReadCompressed &) {
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return 0;
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}
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};
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class Uncompressed : public ReadBase {
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public:
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explicit Uncompressed(int fd) : fd_(fd) {}
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std::size_t Read(void *to, std::size_t amount, ReadCompressed &thunk) {
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std::size_t got = PartialRead(fd_.get(), to, amount);
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ReadCount(thunk) += got;
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return got;
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}
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private:
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scoped_fd fd_;
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};
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class UncompressedWithHeader : public ReadBase {
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public:
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UncompressedWithHeader(int fd, const void *already_data, std::size_t already_size) : fd_(fd) {
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assert(already_size);
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buf_.reset(malloc(already_size));
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if (!buf_.get()) throw std::bad_alloc();
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memcpy(buf_.get(), already_data, already_size);
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remain_ = static_cast<uint8_t*>(buf_.get());
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end_ = remain_ + already_size;
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}
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std::size_t Read(void *to, std::size_t amount, ReadCompressed &thunk) {
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assert(buf_.get());
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assert(remain_ != end_);
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std::size_t sending = std::min<std::size_t>(amount, end_ - remain_);
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memcpy(to, remain_, sending);
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remain_ += sending;
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if (remain_ == end_) {
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ReplaceThis(new Uncompressed(fd_.release()), thunk);
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}
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return sending;
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}
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private:
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scoped_malloc buf_;
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uint8_t *remain_;
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uint8_t *end_;
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scoped_fd fd_;
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};
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static const std::size_t kInputBuffer = 16384;
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template <class Compression> class StreamCompressed : public ReadBase {
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public:
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StreamCompressed(int fd, const void *already_data, std::size_t already_size)
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: file_(fd),
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in_buffer_(MallocOrThrow(kInputBuffer)),
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back_(memcpy(in_buffer_.get(), already_data, already_size), already_size) {}
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std::size_t Read(void *to, std::size_t amount, ReadCompressed &thunk) {
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if (amount == 0) return 0;
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back_.SetOutput(to, amount);
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do {
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if (!back_.Stream().avail_in) ReadInput(thunk);
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if (!back_.Process()) {
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// reached end, at least for the compressed portion.
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std::size_t ret = static_cast<const uint8_t *>(static_cast<void*>(back_.Stream().next_out)) - static_cast<const uint8_t*>(to);
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ReplaceThis(ReadFactory(file_.release(), ReadCount(thunk), back_.Stream().next_in, back_.Stream().avail_in, true), thunk);
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if (ret) return ret;
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// We did not read anything this round, so clients might think EOF. Transfer responsibility to the next reader.
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return Current(thunk)->Read(to, amount, thunk);
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}
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} while (back_.Stream().next_out == to);
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return static_cast<const uint8_t*>(static_cast<void*>(back_.Stream().next_out)) - static_cast<const uint8_t*>(to);
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}
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private:
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void ReadInput(ReadCompressed &thunk) {
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assert(!back_.Stream().avail_in);
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std::size_t got = ReadOrEOF(file_.get(), in_buffer_.get(), kInputBuffer);
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back_.SetInput(in_buffer_.get(), got);
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ReadCount(thunk) += got;
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}
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scoped_fd file_;
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scoped_malloc in_buffer_;
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Compression back_;
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};
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#ifdef HAVE_ZLIB
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class GZip {
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public:
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GZip(const void *base, std::size_t amount) {
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SetInput(base, amount);
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stream_.zalloc = Z_NULL;
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stream_.zfree = Z_NULL;
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stream_.opaque = Z_NULL;
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stream_.msg = NULL;
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// 32 for zlib and gzip decoding with automatic header detection.
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// 15 for maximum window size.
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UTIL_THROW_IF(Z_OK != inflateInit2(&stream_, 32 + 15), GZException, "Failed to initialize zlib.");
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}
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~GZip() {
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if (Z_OK != inflateEnd(&stream_)) {
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std::cerr << "zlib could not close properly." << std::endl;
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abort();
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}
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}
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void SetOutput(void *to, std::size_t amount) {
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stream_.next_out = static_cast<Bytef*>(to);
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stream_.avail_out = std::min<std::size_t>(std::numeric_limits<uInt>::max(), amount);
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}
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void SetInput(const void *base, std::size_t amount) {
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assert(amount < static_cast<std::size_t>(std::numeric_limits<uInt>::max()));
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stream_.next_in = const_cast<Bytef*>(static_cast<const Bytef*>(base));
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stream_.avail_in = amount;
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}
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const z_stream &Stream() const { return stream_; }
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bool Process() {
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int result = inflate(&stream_, 0);
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switch (result) {
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case Z_OK:
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return true;
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case Z_STREAM_END:
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return false;
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case Z_ERRNO:
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UTIL_THROW(ErrnoException, "zlib error");
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default:
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UTIL_THROW(GZException, "zlib encountered " << (stream_.msg ? stream_.msg : "an error ") << " code " << result);
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}
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}
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private:
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z_stream stream_;
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};
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#endif // HAVE_ZLIB
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#ifdef HAVE_BZLIB
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class BZip {
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public:
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BZip(const void *base, std::size_t amount) {
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memset(&stream_, 0, sizeof(stream_));
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SetInput(base, amount);
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HandleError(BZ2_bzDecompressInit(&stream_, 0, 0));
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}
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~BZip() {
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try {
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HandleError(BZ2_bzDecompressEnd(&stream_));
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} catch (const std::exception &e) {
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std::cerr << e.what() << std::endl;
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abort();
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}
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}
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bool Process() {
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int ret = BZ2_bzDecompress(&stream_);
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if (ret == BZ_STREAM_END) return false;
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HandleError(ret);
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return true;
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}
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void SetOutput(void *base, std::size_t amount) {
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stream_.next_out = static_cast<char*>(base);
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stream_.avail_out = std::min<std::size_t>(std::numeric_limits<unsigned int>::max(), amount);
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}
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void SetInput(const void *base, std::size_t amount) {
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stream_.next_in = const_cast<char*>(static_cast<const char*>(base));
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stream_.avail_in = amount;
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}
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const bz_stream &Stream() const { return stream_; }
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private:
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void HandleError(int value) {
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switch(value) {
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case BZ_OK:
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return;
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case BZ_CONFIG_ERROR:
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UTIL_THROW(BZException, "bzip2 seems to be miscompiled.");
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case BZ_PARAM_ERROR:
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UTIL_THROW(BZException, "bzip2 Parameter error");
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case BZ_DATA_ERROR:
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UTIL_THROW(BZException, "bzip2 detected a corrupt file");
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case BZ_DATA_ERROR_MAGIC:
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UTIL_THROW(BZException, "bzip2 detected bad magic bytes. Perhaps this was not a bzip2 file after all?");
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case BZ_MEM_ERROR:
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throw std::bad_alloc();
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default:
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UTIL_THROW(BZException, "Unknown bzip2 error code " << value);
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}
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}
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bz_stream stream_;
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};
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#endif // HAVE_BZLIB
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#ifdef HAVE_XZLIB
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class XZip {
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public:
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XZip(const void *base, std::size_t amount)
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: stream_(), action_(LZMA_RUN) {
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memset(&stream_, 0, sizeof(stream_));
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SetInput(base, amount);
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HandleError(lzma_stream_decoder(&stream_, UINT64_MAX, 0));
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}
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~XZip() {
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lzma_end(&stream_);
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}
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void SetOutput(void *base, std::size_t amount) {
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stream_.next_out = static_cast<uint8_t*>(base);
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stream_.avail_out = amount;
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}
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void SetInput(const void *base, std::size_t amount) {
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stream_.next_in = static_cast<const uint8_t*>(base);
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stream_.avail_in = amount;
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if (!amount) action_ = LZMA_FINISH;
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}
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const lzma_stream &Stream() const { return stream_; }
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bool Process() {
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lzma_ret status = lzma_code(&stream_, action_);
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if (status == LZMA_STREAM_END) return false;
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HandleError(status);
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return true;
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}
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private:
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void HandleError(lzma_ret value) {
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switch (value) {
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case LZMA_OK:
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return;
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case LZMA_MEM_ERROR:
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throw std::bad_alloc();
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case LZMA_FORMAT_ERROR:
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UTIL_THROW(XZException, "xzlib says file format not recognized");
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case LZMA_OPTIONS_ERROR:
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UTIL_THROW(XZException, "xzlib says unsupported compression options");
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case LZMA_DATA_ERROR:
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UTIL_THROW(XZException, "xzlib says this file is corrupt");
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case LZMA_BUF_ERROR:
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UTIL_THROW(XZException, "xzlib says unexpected end of input");
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default:
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UTIL_THROW(XZException, "unrecognized xzlib error " << value);
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}
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}
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lzma_stream stream_;
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lzma_action action_;
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};
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#endif // HAVE_XZLIB
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class IStreamReader : public ReadBase {
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public:
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explicit IStreamReader(std::istream &stream) : stream_(stream) {}
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std::size_t Read(void *to, std::size_t amount, ReadCompressed &thunk) {
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if (!stream_.read(static_cast<char*>(to), amount)) {
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UTIL_THROW_IF(!stream_.eof(), ErrnoException, "istream error");
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amount = stream_.gcount();
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}
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ReadCount(thunk) += amount;
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return amount;
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}
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private:
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std::istream &stream_;
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};
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enum MagicResult {
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UTIL_UNKNOWN, UTIL_GZIP, UTIL_BZIP, UTIL_XZIP
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};
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MagicResult DetectMagic(const void *from_void, std::size_t length) {
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const uint8_t *header = static_cast<const uint8_t*>(from_void);
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if (length >= 2 && header[0] == 0x1f && header[1] == 0x8b) {
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return UTIL_GZIP;
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}
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const uint8_t kBZMagic[3] = {'B', 'Z', 'h'};
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if (length >= sizeof(kBZMagic) && !memcmp(header, kBZMagic, sizeof(kBZMagic))) {
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return UTIL_BZIP;
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}
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const uint8_t kXZMagic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 };
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if (length >= sizeof(kXZMagic) && !memcmp(header, kXZMagic, sizeof(kXZMagic))) {
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return UTIL_XZIP;
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}
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return UTIL_UNKNOWN;
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}
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ReadBase *ReadFactory(int fd, uint64_t &raw_amount, const void *already_data, const std::size_t already_size, bool require_compressed) {
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scoped_fd hold(fd);
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std::string header(reinterpret_cast<const char*>(already_data), already_size);
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if (header.size() < ReadCompressed::kMagicSize) {
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std::size_t original = header.size();
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header.resize(ReadCompressed::kMagicSize);
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std::size_t got = ReadOrEOF(fd, &header[original], ReadCompressed::kMagicSize - original);
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raw_amount += got;
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header.resize(original + got);
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}
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if (header.empty()) {
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return new Complete();
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}
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switch (DetectMagic(&header[0], header.size())) {
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case UTIL_GZIP:
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#ifdef HAVE_ZLIB
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return new StreamCompressed<GZip>(hold.release(), header.data(), header.size());
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#else
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UTIL_THROW(CompressedException, "This looks like a gzip file but gzip support was not compiled in.");
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#endif
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case UTIL_BZIP:
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#ifdef HAVE_BZLIB
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return new StreamCompressed<BZip>(hold.release(), &header[0], header.size());
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#else
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UTIL_THROW(CompressedException, "This looks like a bzip file (it begins with BZh), but bzip support was not compiled in.");
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#endif
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case UTIL_XZIP:
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#ifdef HAVE_XZLIB
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return new StreamCompressed<XZip>(hold.release(), header.data(), header.size());
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#else
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UTIL_THROW(CompressedException, "This looks like an xz file, but xz support was not compiled in.");
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#endif
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default:
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UTIL_THROW_IF(require_compressed, CompressedException, "Uncompressed data detected after a compresssed file. This could be supported but usually indicates an error.");
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return new UncompressedWithHeader(hold.release(), header.data(), header.size());
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}
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}
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} // namespace
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bool ReadCompressed::DetectCompressedMagic(const void *from_void) {
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return DetectMagic(from_void, kMagicSize) != UTIL_UNKNOWN;
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}
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ReadCompressed::ReadCompressed(int fd) {
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Reset(fd);
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}
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ReadCompressed::ReadCompressed(std::istream &in) {
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Reset(in);
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}
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ReadCompressed::ReadCompressed() {}
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ReadCompressed::~ReadCompressed() {}
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void ReadCompressed::Reset(int fd) {
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raw_amount_ = 0;
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internal_.reset();
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internal_.reset(ReadFactory(fd, raw_amount_, NULL, 0, false));
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}
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void ReadCompressed::Reset(std::istream &in) {
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internal_.reset();
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internal_.reset(new IStreamReader(in));
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}
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std::size_t ReadCompressed::Read(void *to, std::size_t amount) {
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return internal_->Read(to, amount, *this);
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}
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std::size_t ReadCompressed::ReadOrEOF(void *const to_in, std::size_t amount) {
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uint8_t *to = reinterpret_cast<uint8_t*>(to_in);
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while (amount) {
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std::size_t got = Read(to, amount);
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if (!got) break;
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to += got;
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amount -= got;
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}
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return to - reinterpret_cast<uint8_t*>(to_in);
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}
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} // namespace util
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