diff options
Diffstat (limited to 'erts/emulator/drivers/common/gzio.c')
| -rw-r--r-- | erts/emulator/drivers/common/gzio.c | 712 |
1 files changed, 1 insertions, 711 deletions
diff --git a/erts/emulator/drivers/common/gzio.c b/erts/emulator/drivers/common/gzio.c index 1ef1602ec9..86c3b07cea 100644 --- a/erts/emulator/drivers/common/gzio.c +++ b/erts/emulator/drivers/common/gzio.c @@ -19,726 +19,16 @@ #include <unistd.h> #endif #include <ctype.h> + #include "erl_driver.h" -#include "erl_efile.h" #include "sys.h" -#ifdef __WIN32__ -#ifndef HAVE_CONFLICTING_FREAD_DECLARATION -#define HAVE_CONFLICTING_FREAD_DECLARATION -#endif -#define FILENAMES_16BIT 1 -#endif - -#ifdef STDC -# define zstrerror(errnum) strerror(errnum) -#else -# define zstrerror(errnum) "" -#endif - #include "gzio_zutil.h" #include "erl_zlib.h" #include "gzio.h" -/********struct internal_state {int dummy;}; / * for buggy compilers */ - -#define Z_BUFSIZE 4096 - -#define ALLOC(size) driver_alloc(size) -#define TRYFREE(p) {if (p) driver_free(p);} - static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */ -/* gzip flag byte */ -#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ -#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */ -#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ -#define ORIG_NAME 0x08 /* bit 3 set: original file name present */ -#define COMMENT 0x10 /* bit 4 set: file comment present */ -#define RESERVED 0xE0 /* bits 5..7: reserved */ - -typedef struct gz_stream { - z_stream stream; - int z_err; /* error code for last stream operation */ - int z_eof; /* set if end of input file */ -#ifdef UNIX - int file; /* .gz file descriptor */ -#else - FILE *file; /* .gz file */ -#endif - Byte *inbuf; /* input buffer */ - Byte *outbuf; /* output buffer */ - uLong crc; /* crc32 of uncompressed data */ - char *msg; /* error message */ - char *path; /* path name for debugging only */ - int transparent; /* 1 if input file is not a .gz file */ - char mode; /* 'w' or 'r' */ - int position; /* Position (for seek) */ - int (*destroy)(struct gz_stream*); /* Function to destroy - * this structure. */ -} gz_stream; - -local ErtsGzFile gz_open (const char *path, const char *mode); -local int get_byte (gz_stream *s); -local void check_header (gz_stream *s); -local int destroy (gz_stream *s); -local uLong getLong (gz_stream *s); - -#ifdef UNIX -/* - * In Solaris 8 and earlier, fopen() and its friends cannot handle - * file descriptors larger than 255. Therefore, we use read()/write() - * on all Unix systems. - */ -# define ERTS_GZWRITE(File, Buf, Count) write((File), (Buf), (Count)) -# define ERTS_GZREAD(File, Buf, Count) read((File), (Buf), (Count)) -#else -/* - * On all other operating systems, using fopen(), fread()/fwrite(), since - * there is not guaranteed to exist any read()/write() (not part of - * ANSI/ISO-C). - */ -# define ERTS_GZWRITE(File, Buf, Count) fwrite((Buf), 1, (Count), (File)) -# define ERTS_GZREAD(File, Buf, Count) fread((Buf), 1, (Count), (File)) -#endif - -/* - * Ripped from efile_drv.c - */ - -#ifdef FILENAMES_16BIT -# define FILENAME_BYTELEN(Str) filename_len_16bit(Str) -# define FILENAME_COPY(To,From) filename_cpy_16bit((To),(From)) -# define FILENAME_CHARSIZE 2 - - static int filename_len_16bit(const char *str) - { - const char *p = str; - while(*p != '\0' || p[1] != '\0') { - p += 2; - } - return (p - str); - } - - static void filename_cpy_16bit(char *to, const char *from) - { - while(*from != '\0' || from[1] != '\0') { - *to++ = *from++; - *to++ = *from++; - } - *to++ = *from++; - *to++ = *from++; - } - -#else -# define FILENAME_BYTELEN(Str) strlen(Str) -# define FILENAME_COPY(To,From) strcpy(To,From) -# define FILENAME_CHARSIZE 1 -#endif - -/* =========================================================================== - Opens a gzip (.gz) file for reading or writing. The mode parameter - is as in fopen ("rb" or "wb"). The file is given either by file descriptor - or path name (if fd == -1). - gz_open return NULL if the file could not be opened or if there was - insufficient memory to allocate the (de)compression state; errno - can be checked to distinguish the two cases (if errno is zero, the - zlib error is Z_MEM_ERROR). -*/ -local ErtsGzFile gz_open (path, mode) - const char *path; - const char *mode; -{ - int err; - int level = Z_DEFAULT_COMPRESSION; /* compression level */ - char *p = (char*)mode; - gz_stream *s; - char fmode[80]; /* copy of mode, without the compression level */ - char *m = fmode; - - if (!path || !mode) return Z_NULL; - - s = (gz_stream *)ALLOC(sizeof(gz_stream)); - if (!s) return Z_NULL; - - erl_zlib_alloc_init(&s->stream); - s->stream.next_in = s->inbuf = Z_NULL; - s->stream.next_out = s->outbuf = Z_NULL; - s->stream.avail_in = s->stream.avail_out = 0; -#ifdef UNIX - s->file = -1; -#else - s->file = NULL; -#endif - s->z_err = Z_OK; - s->z_eof = 0; - s->crc = crc32(0L, Z_NULL, 0); - s->msg = NULL; - s->transparent = 0; - s->position = 0; - s->destroy = destroy; - - s->path = (char*)ALLOC(FILENAME_BYTELEN(path)+FILENAME_CHARSIZE); - if (s->path == NULL) { - return s->destroy(s), (ErtsGzFile)Z_NULL; - } - FILENAME_COPY(s->path, path); /* do this early for debugging */ - - s->mode = '\0'; - do { - if (*p == 'r') - s->mode = 'r'; - if (*p == 'w' || *p == 'a') - s->mode = 'w'; - if (isdigit((int)*p)) { - level = *p - '0'; - } else { - *m++ = *p; /* Copy the mode */ - } - } while (*p++ && m < fmode + sizeof(fmode) - 1); - *m = '\0'; - if (s->mode == '\0') - return s->destroy(s), (ErtsGzFile)Z_NULL; - - if (s->mode == 'w') { - err = deflateInit2(&(s->stream), level, - Z_DEFLATED, MAX_WBITS+16, DEF_MEM_LEVEL, 0); - /* windowBits is passed < 0 to suppress zlib header */ - - s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE); - - if (err != Z_OK || s->outbuf == Z_NULL) { - return s->destroy(s), (ErtsGzFile)Z_NULL; - } - } else { - /* - * It is tempting to use the built-in support in zlib - * for handling GZIP headers, but unfortunately it - * cannot handle multiple GZIP headers (which occur when - * several GZIP files have been concatenated). - */ - - err = inflateInit2(&(s->stream), -MAX_WBITS); - s->stream.next_in = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); - - if (err != Z_OK || s->inbuf == Z_NULL) { - return s->destroy(s), (ErtsGzFile)Z_NULL; - } - } - s->stream.avail_out = Z_BUFSIZE; - - errno = 0; -#if defined(FILENAMES_16BIT) - { - FILE* efile_wfopen(const WCHAR* name, const WCHAR* mode); - WCHAR wfmode[80]; - int i = 0; - int j; - for(j = 0; fmode[j] != '\0'; ++j) { - wfmode[i++] = (WCHAR) fmode[j]; - } - wfmode[i++] = L'\0'; - s->file = efile_wfopen((WCHAR *)path, wfmode); - if (s->file == NULL) { - return s->destroy(s), (ErtsGzFile)Z_NULL; - } - } -#elif defined(UNIX) - if (s->mode == 'r') { - s->file = open(path, O_RDONLY); - } else { - s->file = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0666); - } - if (s->file == -1) { - return s->destroy(s), (ErtsGzFile)Z_NULL; - } -#else - s->file = fopen(path, fmode); - if (s->file == NULL) { - return s->destroy(s), (ErtsGzFile)Z_NULL; - } -#endif - if (s->mode == 'r') { - check_header(s); /* skip the .gz header */ - } - return (ErtsGzFile)s; -} - -/* =========================================================================== - Rewind a gzfile back to the beginning. -*/ - -local int gz_rewind (gz_stream *s) -{ - TRYFREE(s->msg); - -#ifdef UNIX - lseek(s->file, 0L, SEEK_SET); -#else - fseek(s->file, 0L, SEEK_SET); -#endif - inflateReset(&(s->stream)); - s->stream.next_in = Z_NULL; - s->stream.next_out = Z_NULL; - s->stream.avail_in = s->stream.avail_out = 0; - s->z_err = Z_OK; - s->z_eof = 0; - s->crc = crc32(0L, Z_NULL, 0); - s->msg = NULL; - s->position = 0; - s->stream.next_in = s->inbuf; - - s->stream.avail_out = Z_BUFSIZE; - - check_header(s); /* skip the .gz header */ - return 1; -} - -/* =========================================================================== - Opens a gzip (.gz) file for reading or writing. -*/ -ErtsGzFile erts_gzopen (path, mode) - const char *path; - const char *mode; -{ - return gz_open (path, mode); -} - - -/* =========================================================================== - Read a byte from a gz_stream; update next_in and avail_in. Return EOF - for end of file. - IN assertion: the stream s has been sucessfully opened for reading. -*/ -local int get_byte(s) - gz_stream *s; -{ - if (s->z_eof) return EOF; - if (s->stream.avail_in == 0) { -#ifdef UNIX - ssize_t res; - errno = 0; - res = ERTS_GZREAD(s->file, s->inbuf, Z_BUFSIZE); - if (res == 0) { - s->stream.avail_in = 0; - s->z_eof = 1; - return EOF; - } else if (res < 0) { - s->stream.avail_in = 0; - s->z_eof = 1; - s->z_err = Z_ERRNO; - return EOF; - } else { - s->stream.avail_in = (uInt) res; - } -#else - errno = 0; - s->stream.avail_in = ERTS_GZREAD(s->file, s->inbuf, Z_BUFSIZE); - if (s->stream.avail_in == 0) { - s->z_eof = 1; - if (s->file && ferror(s->file)) - s->z_err = Z_ERRNO; - return EOF; - } -#endif - s->stream.next_in = s->inbuf; - } - s->stream.avail_in--; - return *(s->stream.next_in)++; -} - -/* =========================================================================== - Check the gzip header of a gz_stream opened for reading. Set the stream - mode to transparent if the gzip magic header is not present; set s->err - to Z_DATA_ERROR if the magic header is present but the rest of the header - is incorrect. - IN assertion: the stream s has already been created sucessfully; - s->stream.avail_in is zero for the first time, but may be non-zero - for concatenated .gz files. -*/ -local void check_header(s) - gz_stream *s; -{ - int method; /* method byte */ - int flags; /* flags byte */ - uInt len; - int c; - - /* Check the gzip magic header */ - for (len = 0; len < 2; len++) { - c = get_byte(s); - if (c != gz_magic[len]) { - if (len != 0) s->stream.avail_in++, s->stream.next_in--; - if (c != EOF) { - s->stream.avail_in++, s->stream.next_in--; - s->transparent = 1; - } - s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END; - return; - } - } - method = get_byte(s); - flags = get_byte(s); - if (method != Z_DEFLATED || (flags & RESERVED) != 0) { - s->z_err = Z_DATA_ERROR; - return; - } - - /* Discard time, xflags and OS code: */ - for (len = 0; len < 6; len++) (void)get_byte(s); - - if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */ - len = (uInt)get_byte(s); - len += ((uInt)get_byte(s))<<8; - /* len is garbage if EOF but the loop below will quit anyway */ - while (len-- != 0 && get_byte(s) != EOF) ; - } - if ((flags & ORIG_NAME) != 0) { /* skip the original file name */ - while ((c = get_byte(s)) != 0 && c != EOF) ; - } - if ((flags & COMMENT) != 0) { /* skip the .gz file comment */ - while ((c = get_byte(s)) != 0 && c != EOF) ; - } - if ((flags & HEAD_CRC) != 0) { /* skip the header crc */ - for (len = 0; len < 2; len++) (void)get_byte(s); - } - s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK; -} - - /* =========================================================================== - * Cleanup then free the given gz_stream. Return a zlib error code. - Try freeing in the reverse order of allocations. - */ -local int destroy (s) - gz_stream *s; -{ - int err = Z_OK; - - if (!s) return Z_STREAM_ERROR; - - TRYFREE(s->msg); - - if (s->stream.state != NULL) { - if (s->mode == 'w') { - err = deflateEnd(&(s->stream)); - } else if (s->mode == 'r') { - err = inflateEnd(&(s->stream)); - } - } -#ifdef UNIX - if (s->file != -1 && close(s->file)) { - err = Z_ERRNO; - } -#else - if (s->file != NULL && fclose(s->file)) { - err = Z_ERRNO; - } -#endif - if (s->z_err < 0) err = s->z_err; - - TRYFREE(s->inbuf); - TRYFREE(s->outbuf); - TRYFREE(s->path); - TRYFREE(s); - return err; -} - -/* =========================================================================== - Reads the given number of uncompressed bytes from the compressed file. - gzread returns the number of bytes actually read (0 for end of file). -*/ -int -erts_gzread(ErtsGzFile file, voidp buf, unsigned len) -{ - gz_stream *s = (gz_stream*)file; - Bytef *start = buf; /* starting point for crc computation */ - Byte *next_out; /* == stream.next_out but not forced far (for MSDOS) */ - - if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR; - - if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1; - if (s->z_err == Z_STREAM_END) return 0; /* EOF */ - - s->stream.next_out = next_out = buf; - s->stream.avail_out = len; - - while (s->stream.avail_out != 0) { - - if (s->transparent) { - /* Copy first the lookahead bytes: */ - uInt n = s->stream.avail_in; - if (n > s->stream.avail_out) n = s->stream.avail_out; - if (n > 0) { - zmemcpy(s->stream.next_out, s->stream.next_in, n); - next_out += n; - s->stream.next_out = next_out; - s->stream.next_in += n; - s->stream.avail_out -= n; - s->stream.avail_in -= n; - } - if (s->stream.avail_out > 0) { - s->stream.avail_out -= ERTS_GZREAD(s->file, next_out, - s->stream.avail_out); - } - len -= s->stream.avail_out; - s->stream.total_in += (uLong)len; - s->stream.total_out += (uLong)len; - if (len == 0) s->z_eof = 1; - s->position += (int)len; - return (int)len; - } - if (s->stream.avail_in == 0 && !s->z_eof) { -#ifdef UNIX - ssize_t res; - errno = 0; - res = ERTS_GZREAD(s->file, s->inbuf, Z_BUFSIZE); - if (res == 0) { - s->stream.avail_in = 0; - s->z_eof = 1; - return EOF; - } else if (res < 0) { - s->stream.avail_in = 0; - s->z_eof = 1; - s->z_err = Z_ERRNO; - return EOF; - } else { - s->stream.avail_in = (uInt) res; - } -#else - errno = 0; - s->stream.avail_in = ERTS_GZREAD(s->file, s->inbuf, Z_BUFSIZE); - if (s->stream.avail_in == 0) { - s->z_eof = 1; - if (s->file && ferror(s->file)) { - s->z_err = Z_ERRNO; - break; - } - } -#endif - s->stream.next_in = s->inbuf; - } - s->z_err = inflate(&(s->stream), Z_NO_FLUSH); - - if (s->z_err == Z_STREAM_END) { - /* Check CRC and original size */ - s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); - start = s->stream.next_out; - - if (getLong(s) != s->crc) { - s->z_err = Z_DATA_ERROR; - } else { - (void)getLong(s); - /* The uncompressed length returned by above getlong() may - * be different from s->stream.total_out) in case of - * concatenated .gz files. Check for such files: - */ - check_header(s); - if (s->z_err == Z_OK) { - uLong total_in = s->stream.total_in; - uLong total_out = s->stream.total_out; - - inflateReset(&(s->stream)); - s->stream.total_in = total_in; - s->stream.total_out = total_out; - s->crc = crc32(0L, Z_NULL, 0); - } - } - } - if (s->z_err != Z_OK || s->z_eof) break; - } - s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start)); - - s->position += (int)(len - s->stream.avail_out); - - return (int)(len - s->stream.avail_out); -} - -/* =========================================================================== - Writes the given number of uncompressed bytes into the compressed file. - gzwrite returns the number of bytes actually written (0 in case of error). -*/ -int -erts_gzwrite(ErtsGzFile file, voidp buf, unsigned len) -{ - gz_stream *s = (gz_stream*)file; - - if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; - - s->stream.next_in = buf; - s->stream.avail_in = len; - - while (s->stream.avail_in != 0) { - - if (s->stream.avail_out == 0) { - - s->stream.next_out = s->outbuf; - if (ERTS_GZWRITE(s->file, s->outbuf, Z_BUFSIZE) != Z_BUFSIZE) { - s->z_err = Z_ERRNO; - break; - } - s->stream.avail_out = Z_BUFSIZE; - } - s->z_err = deflate(&(s->stream), Z_NO_FLUSH); - if (s->z_err != Z_OK) break; - } - s->position += (int)(len - s->stream.avail_in); - return (int)(len - s->stream.avail_in); -} - -/* - * For use by Erlang file driver. - * - * XXX Limitations: - * - SEEK_END is not allowed (length of file is not known). - * - When writing, only forward seek is supported. - */ - -int -erts_gzseek(ErtsGzFile file, int offset, int whence) -{ - int pos; - gz_stream* s = (gz_stream *) file; - - switch (whence) { - case EFILE_SEEK_SET: whence = SEEK_SET; break; - case EFILE_SEEK_CUR: whence = SEEK_CUR; break; - case EFILE_SEEK_END: whence = SEEK_END; break; - default: - errno = EINVAL; - return -1; - } - - if (s == NULL) { - errno = EINVAL; - return -1; - } - if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) { - errno = EIO; - return -1; - } - - switch (whence) { - case SEEK_SET: pos = offset; break; - case SEEK_CUR: pos = s->position+offset; break; - case SEEK_END: - default: - errno = EINVAL; return -1; - } - - if (pos == s->position) { - return pos; - } - - if (pos < s->position) { - if (s->mode == 'w') { - errno = EINVAL; - return -1; - } - gz_rewind(s); - } - - while (s->position < pos) { - char buf[512]; - int n; - int save_pos = s->position; - - n = pos - s->position; - if (n > sizeof(buf)) - n = sizeof(buf); - - if (s->mode == 'r') { - erts_gzread(file, buf, n); - } else { - memset(buf, '\0', n); - erts_gzwrite(file, buf, n); - } - if (save_pos == s->position) break; - } - - return s->position; -} - -/* =========================================================================== - Flushes all pending output into the compressed file. The parameter - flush is as in the deflate() function. - gzflush should be called only when strictly necessary because it can - degrade compression. -*/ -int -erts_gzflush(ErtsGzFile file, int flush) -{ - uInt len; - int done = 0; - gz_stream *s = (gz_stream*)file; - - if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR; - - s->stream.avail_in = 0; /* should be zero already anyway */ - - for (;;) { - len = Z_BUFSIZE - s->stream.avail_out; - - if (len != 0) { - if ((uInt)ERTS_GZWRITE(s->file, s->outbuf, len) != len) { - s->z_err = Z_ERRNO; - return Z_ERRNO; - } - s->stream.next_out = s->outbuf; - s->stream.avail_out = Z_BUFSIZE; - } - if (done) break; - s->z_err = deflate(&(s->stream), flush); - - /* deflate has finished flushing only when it hasn't used up - * all the available space in the output buffer: - */ - done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END); - - if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break; - } -#ifndef UNIX - fflush(s->file); -#endif - return s->z_err == Z_STREAM_END ? Z_OK : s->z_err; -} - -/* =========================================================================== - Reads a long in LSB order from the given gz_stream. Sets -*/ -local uLong getLong (s) - gz_stream *s; -{ - uLong x = (uLong)get_byte(s); - int c; - - x += ((uLong)get_byte(s))<<8; - x += ((uLong)get_byte(s))<<16; - c = get_byte(s); - if (c == EOF) s->z_err = Z_DATA_ERROR; - x += ((uLong)c)<<24; - return x; -} - -/* =========================================================================== - Flushes all pending output if necessary, closes the compressed file - and deallocates all the (de)compression state. -*/ -int -erts_gzclose(ErtsGzFile file) -{ - int err; - gz_stream *s = (gz_stream*)file; - - if (s == NULL) return Z_STREAM_ERROR; - - if (s->mode == 'w') { - err = erts_gzflush (file, Z_FINISH); - if (err != Z_OK) return s->destroy(s); - } - return s->destroy(s); -} - - /* =========================================================================== Uncompresses the buffer given and returns a pointer to a binary. If the buffer was not compressed with gzip, the buffer contents |