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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| #include "kernel/yosys_common.h" | ||
| #include "kernel/log.h" | ||
| #include "kernel/gzip.h" | ||
| #include <iostream> | ||
| #include <dirent.h> | ||
| #include <string> | ||
| #include <cstdarg> | ||
| #include <cstdio> | ||
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| YOSYS_NAMESPACE_BEGIN | ||
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| #ifdef YOSYS_ENABLE_ZLIB | ||
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| PRIVATE_NAMESPACE_BEGIN | ||
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| using namespace Zlib; | ||
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| PRIVATE_NAMESPACE_END | ||
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| gzip_ostream::obuf::obuf() { | ||
| setp(buffer, buffer + buffer_size - 1); | ||
| } | ||
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| bool gzip_ostream::obuf::open(const std::string &filename) { | ||
| gzf = gzopen(filename.c_str(), "wb"); | ||
| return gzf != nullptr; | ||
| } | ||
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| int gzip_ostream::obuf::sync() { | ||
| int num = pptr() - pbase(); | ||
| if (num > 0) { | ||
| if (gzwrite(gzf, reinterpret_cast<const void*>(pbase()), num) != num) { | ||
| return -1; | ||
| } | ||
| pbump(-num); | ||
| } | ||
| return 0; | ||
| } | ||
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| gzip_ostream::obuf::~obuf() { | ||
| if (gzf) { | ||
| sync(); | ||
| gzclose(gzf); | ||
| } | ||
| } | ||
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| bool gzip_istream::ibuf::open(const std::string& filename) { | ||
| if (gzf) { | ||
| Zlib::gzclose(gzf); | ||
| } | ||
| gzf = Zlib::gzopen(filename.c_str(), "rb"); | ||
| if (!gzf) { | ||
| return false; | ||
| } | ||
| // Empty and point to start | ||
| setg(buffer, buffer, buffer); | ||
| return true; | ||
| } | ||
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| // Called when the buffer is empty and more input is needed | ||
| std::istream::int_type gzip_istream::ibuf::underflow() { | ||
| log_assert(gzf && "No gzfile opened\n"); | ||
| int bytes_read = Zlib::gzread(gzf, buffer, buffer_size); | ||
| if (bytes_read <= 0) { | ||
| if (Zlib::gzeof(gzf)) | ||
| return traits_type::eof(); | ||
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| int err; | ||
| const char* error_msg = Zlib::gzerror(gzf, &err); | ||
| if (err != Z_OK) | ||
| log_error("%s", error_msg); | ||
| else | ||
| log_error("Decompression logic failure: "\ | ||
| "read <=0 bytes but neither EOF nor error\n"); | ||
| } | ||
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| // Keep size and point to start | ||
| setg(buffer, buffer, buffer + bytes_read); | ||
| return traits_type::to_int_type(buffer[0]); | ||
| } | ||
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| gzip_istream::ibuf::~ibuf() { | ||
| if (gzf) { | ||
| int err = Zlib::gzclose(gzf); | ||
| if (err != Z_OK) { | ||
| // OK to overwrite rr it, it doesn't change | ||
| const char* error_msg = Zlib::gzerror(gzf, &err); | ||
| log_error("%s", error_msg); | ||
| } | ||
| } | ||
| } | ||
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| #endif // YOSYS_ENABLE_ZLIB | ||
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| // Takes a successfully opened ifstream. If it's gzipped, returns an istream. Otherwise, | ||
| // returns the original ifstream, rewound to the start. | ||
| std::istream* uncompressed(std::ifstream* f, const std::string filename) { | ||
| if (!f) | ||
| return nullptr; | ||
| // Check for gzip magic | ||
| unsigned char magic[3]; | ||
| int n = 0; | ||
| while (n < 3) | ||
| { | ||
| int c = f->get(); | ||
| if (c != EOF) { | ||
| magic[n] = (unsigned char) c; | ||
| } | ||
| n++; | ||
| } | ||
| if (n == 3 && magic[0] == 0x1f && magic[1] == 0x8b) { | ||
| #ifdef YOSYS_ENABLE_ZLIB | ||
| log("Found gzip magic in file `%s', decompressing using zlib.\n", filename.c_str()); | ||
| if (magic[2] != 8) | ||
| log_cmd_error("gzip file `%s' uses unsupported compression type %02x\n", | ||
| filename.c_str(), unsigned(magic[2])); | ||
| delete f; | ||
| gzip_istream* s = new gzip_istream(); | ||
| return s->open(filename.c_str()) ? s : nullptr; | ||
| #else | ||
| log_cmd_error("File `%s' is a gzip file, but Yosys is compiled without zlib.\n", filename.c_str()); | ||
| #endif // YOSYS_ENABLE_ZLIB | ||
| } else { | ||
| f->clear(); | ||
| f->seekg(0, std::ios::beg); | ||
| return f; | ||
| } | ||
| } | ||
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| YOSYS_NAMESPACE_END |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| #include <string> | ||
| #include <unistd.h> | ||
| #include "kernel/yosys_common.h" | ||
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| #ifndef YOSYS_GZIP_H | ||
| #define YOSYS_GZIP_H | ||
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| YOSYS_NAMESPACE_BEGIN | ||
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| #ifdef YOSYS_ENABLE_ZLIB | ||
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| namespace Zlib { | ||
| #include <zlib.h> | ||
| } | ||
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| /* | ||
| An output stream that uses a stringbuf to buffer data internally, | ||
| using zlib to write gzip-compressed data every time the stream is flushed. | ||
| */ | ||
| class gzip_ostream : public std::ostream { | ||
| public: | ||
| gzip_ostream(): std::ostream(nullptr) { | ||
| rdbuf(&outbuf); | ||
| } | ||
| bool open(const std::string &filename) { | ||
| return outbuf.open(filename); | ||
| } | ||
| private: | ||
| class obuf : public std::stringbuf { | ||
| public: | ||
| obuf(); | ||
| bool open(const std::string &filename); | ||
| virtual int sync() override; | ||
| virtual ~obuf(); | ||
| private: | ||
| static const int buffer_size = 4096; | ||
| char buffer[buffer_size]; // Internal buffer for compressed data | ||
| Zlib::gzFile gzf = nullptr; // Handle to the gzip file | ||
| }; | ||
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| obuf outbuf; // The stream buffer instance | ||
| }; | ||
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| /* | ||
| An input stream that uses zlib to read gzip-compressed data from a file, | ||
| buffering the decompressed data internally using its own buffer. | ||
| */ | ||
| class gzip_istream final : public std::istream { | ||
| public: | ||
| gzip_istream() : std::istream(&inbuf) {} | ||
| bool open(const std::string& filename) { | ||
| return inbuf.open(filename); | ||
| } | ||
| private: | ||
| class ibuf final : public std::streambuf { | ||
| public: | ||
| ibuf() : gzf(nullptr) {} | ||
| bool open(const std::string& filename); | ||
| virtual ~ibuf(); | ||
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| protected: | ||
| // Called when the buffer is empty and more input is needed | ||
| virtual int_type underflow() override; | ||
| private: | ||
| static const int buffer_size = 8192; | ||
| char buffer[buffer_size]; | ||
| Zlib::gzFile gzf; | ||
| }; | ||
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| ibuf inbuf; // The stream buffer instance | ||
| }; | ||
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| #endif // YOSYS_ENABLE_ZLIB | ||
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| std::istream* uncompressed(std::ifstream* f, const std::string filename); | ||
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| YOSYS_NAMESPACE_END | ||
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| #endif // YOSYS_GZIP_H |
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