+++ /dev/null
-/* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "gzguts.h"
-
-#if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__)
-# define LSEEK _lseeki64
-#else
-#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
-# define LSEEK lseek64
-#else
-# define LSEEK lseek
-#endif
-#endif
-
-/* Local functions */
-local void gz_reset OF((gz_statep));
-local gzFile gz_open OF((const void *, int, const char *));
-
-#if defined UNDER_CE
-
-/* Map the Windows error number in ERROR to a locale-dependent error message
- string and return a pointer to it. Typically, the values for ERROR come
- from GetLastError.
-
- The string pointed to shall not be modified by the application, but may be
- overwritten by a subsequent call to gz_strwinerror
-
- The gz_strwinerror function does not change the current setting of
- GetLastError. */
-char ZLIB_INTERNAL *gz_strwinerror (error)
- DWORD error;
-{
- static char buf[1024];
-
- wchar_t *msgbuf;
- DWORD lasterr = GetLastError();
- DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
- | FORMAT_MESSAGE_ALLOCATE_BUFFER,
- NULL,
- error,
- 0, /* Default language */
- (LPVOID)&msgbuf,
- 0,
- NULL);
- if (chars != 0) {
- /* If there is an \r\n appended, zap it. */
- if (chars >= 2
- && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
- chars -= 2;
- msgbuf[chars] = 0;
- }
-
- if (chars > sizeof (buf) - 1) {
- chars = sizeof (buf) - 1;
- msgbuf[chars] = 0;
- }
-
- wcstombs(buf, msgbuf, chars + 1);
- LocalFree(msgbuf);
- }
- else {
- sprintf(buf, "unknown win32 error (%ld)", error);
- }
-
- SetLastError(lasterr);
- return buf;
-}
-
-#endif /* UNDER_CE */
-
-/* Reset gzip file state */
-local void gz_reset(state)
- gz_statep state;
-{
- state->x.have = 0; /* no output data available */
- if (state->mode == GZ_READ) { /* for reading ... */
- state->eof = 0; /* not at end of file */
- state->past = 0; /* have not read past end yet */
- state->how = LOOK; /* look for gzip header */
- }
- state->seek = 0; /* no seek request pending */
- gz_error(state, Z_OK, NULL); /* clear error */
- state->x.pos = 0; /* no uncompressed data yet */
- state->strm.avail_in = 0; /* no input data yet */
-}
-
-/* Open a gzip file either by name or file descriptor. */
-local gzFile gz_open(path, fd, mode)
- const void *path;
- int fd;
- const char *mode;
-{
- gz_statep state;
- z_size_t len;
- int oflag;
-#ifdef O_CLOEXEC
- int cloexec = 0;
-#endif
-#ifdef O_EXCL
- int exclusive = 0;
-#endif
-
- /* check input */
- if (path == NULL)
- return NULL;
-
- /* allocate gzFile structure to return */
- state = (gz_statep)malloc(sizeof(gz_state));
- if (state == NULL)
- return NULL;
- state->size = 0; /* no buffers allocated yet */
- state->want = GZBUFSIZE; /* requested buffer size */
- state->msg = NULL; /* no error message yet */
-
- /* interpret mode */
- state->mode = GZ_NONE;
- state->level = Z_DEFAULT_COMPRESSION;
- state->strategy = Z_DEFAULT_STRATEGY;
- state->direct = 0;
- while (*mode) {
- if (*mode >= '0' && *mode <= '9')
- state->level = *mode - '0';
- else
- switch (*mode) {
- case 'r':
- state->mode = GZ_READ;
- break;
-#ifndef NO_GZCOMPRESS
- case 'w':
- state->mode = GZ_WRITE;
- break;
- case 'a':
- state->mode = GZ_APPEND;
- break;
-#endif
- case '+': /* can't read and write at the same time */
- free(state);
- return NULL;
- case 'b': /* ignore -- will request binary anyway */
- break;
-#ifdef O_CLOEXEC
- case 'e':
- cloexec = 1;
- break;
-#endif
-#ifdef O_EXCL
- case 'x':
- exclusive = 1;
- break;
-#endif
- case 'f':
- state->strategy = Z_FILTERED;
- break;
- case 'h':
- state->strategy = Z_HUFFMAN_ONLY;
- break;
- case 'R':
- state->strategy = Z_RLE;
- break;
- case 'F':
- state->strategy = Z_FIXED;
- break;
- case 'T':
- state->direct = 1;
- break;
- default: /* could consider as an error, but just ignore */
- ;
- }
- mode++;
- }
-
- /* must provide an "r", "w", or "a" */
- if (state->mode == GZ_NONE) {
- free(state);
- return NULL;
- }
-
- /* can't force transparent read */
- if (state->mode == GZ_READ) {
- if (state->direct) {
- free(state);
- return NULL;
- }
- state->direct = 1; /* for empty file */
- }
-
- /* save the path name for error messages */
-#ifdef WIDECHAR
- if (fd == -2) {
- len = wcstombs(NULL, path, 0);
- if (len == (z_size_t)-1)
- len = 0;
- }
- else
-#endif
- len = strlen((const char *)path);
- state->path = (char *)malloc(len + 1);
- if (state->path == NULL) {
- free(state);
- return NULL;
- }
-#ifdef WIDECHAR
- if (fd == -2)
- if (len)
- wcstombs(state->path, path, len + 1);
- else
- *(state->path) = 0;
- else
-#endif
-#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
- (void)snprintf(state->path, len + 1, "%s", (const char *)path);
-#else
- strcpy(state->path, path);
-#endif
-
- /* compute the flags for open() */
- oflag =
-#ifdef O_LARGEFILE
- O_LARGEFILE |
-#endif
-#ifdef O_BINARY
- O_BINARY |
-#endif
-#ifdef O_CLOEXEC
- (cloexec ? O_CLOEXEC : 0) |
-#endif
- (state->mode == GZ_READ ?
- O_RDONLY :
- (O_WRONLY | O_CREAT |
-#ifdef O_EXCL
- (exclusive ? O_EXCL : 0) |
-#endif
- (state->mode == GZ_WRITE ?
- O_TRUNC :
- O_APPEND)));
-
- /* open the file with the appropriate flags (or just use fd) */
- state->fd = fd > -1 ? fd : (
-#ifdef WIDECHAR
- fd == -2 ? _wopen(path, oflag, 0666) :
-#endif
- open((const char *)path, oflag, 0666));
- if (state->fd == -1) {
- free(state->path);
- free(state);
- return NULL;
- }
- if (state->mode == GZ_APPEND) {
- LSEEK(state->fd, 0, SEEK_END); /* so gzoffset() is correct */
- state->mode = GZ_WRITE; /* simplify later checks */
- }
-
- /* save the current position for rewinding (only if reading) */
- if (state->mode == GZ_READ) {
- state->start = LSEEK(state->fd, 0, SEEK_CUR);
- if (state->start == -1) state->start = 0;
- }
-
- /* initialize stream */
- gz_reset(state);
-
- /* return stream */
- return (gzFile)state;
-}
-
-/* -- see zlib.h -- */
-gzFile ZEXPORT gzopen(path, mode)
- const char *path;
- const char *mode;
-{
- return gz_open(path, -1, mode);
-}
-
-/* -- see zlib.h -- */
-gzFile ZEXPORT gzopen64(path, mode)
- const char *path;
- const char *mode;
-{
- return gz_open(path, -1, mode);
-}
-
-/* -- see zlib.h -- */
-gzFile ZEXPORT gzdopen(fd, mode)
- int fd;
- const char *mode;
-{
- char *path; /* identifier for error messages */
- gzFile gz;
-
- if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
- return NULL;
-#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
- (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd);
-#else
- sprintf(path, "<fd:%d>", fd); /* for debugging */
-#endif
- gz = gz_open(path, fd, mode);
- free(path);
- return gz;
-}
-
-/* -- see zlib.h -- */
-#ifdef WIDECHAR
-gzFile ZEXPORT gzopen_w(path, mode)
- const wchar_t *path;
- const char *mode;
-{
- return gz_open(path, -2, mode);
-}
-#endif
-
-/* -- see zlib.h -- */
-int ZEXPORT gzbuffer(file, size)
- gzFile file;
- unsigned size;
-{
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return -1;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return -1;
-
- /* make sure we haven't already allocated memory */
- if (state->size != 0)
- return -1;
-
- /* check and set requested size */
- if ((size << 1) < size)
- return -1; /* need to be able to double it */
- if (size < 2)
- size = 2; /* need two bytes to check magic header */
- state->want = size;
- return 0;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzrewind(file)
- gzFile file;
-{
- gz_statep state;
-
- /* get internal structure */
- if (file == NULL)
- return -1;
- state = (gz_statep)file;
-
- /* check that we're reading and that there's no error */
- if (state->mode != GZ_READ ||
- (state->err != Z_OK && state->err != Z_BUF_ERROR))
- return -1;
-
- /* back up and start over */
- if (LSEEK(state->fd, state->start, SEEK_SET) == -1)
- return -1;
- gz_reset(state);
- return 0;
-}
-
-/* -- see zlib.h -- */
-z_off64_t ZEXPORT gzseek64(file, offset, whence)
- gzFile file;
- z_off64_t offset;
- int whence;
-{
- unsigned n;
- z_off64_t ret;
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return -1;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return -1;
-
- /* check that there's no error */
- if (state->err != Z_OK && state->err != Z_BUF_ERROR)
- return -1;
-
- /* can only seek from start or relative to current position */
- if (whence != SEEK_SET && whence != SEEK_CUR)
- return -1;
-
- /* normalize offset to a SEEK_CUR specification */
- if (whence == SEEK_SET)
- offset -= state->x.pos;
- else if (state->seek)
- offset += state->skip;
- state->seek = 0;
-
- /* if within raw area while reading, just go there */
- if (state->mode == GZ_READ && state->how == COPY &&
- state->x.pos + offset >= 0) {
- ret = LSEEK(state->fd, offset - state->x.have, SEEK_CUR);
- if (ret == -1)
- return -1;
- state->x.have = 0;
- state->eof = 0;
- state->past = 0;
- state->seek = 0;
- gz_error(state, Z_OK, NULL);
- state->strm.avail_in = 0;
- state->x.pos += offset;
- return state->x.pos;
- }
-
- /* calculate skip amount, rewinding if needed for back seek when reading */
- if (offset < 0) {
- if (state->mode != GZ_READ) /* writing -- can't go backwards */
- return -1;
- offset += state->x.pos;
- if (offset < 0) /* before start of file! */
- return -1;
- if (gzrewind(file) == -1) /* rewind, then skip to offset */
- return -1;
- }
-
- /* if reading, skip what's in output buffer (one less gzgetc() check) */
- if (state->mode == GZ_READ) {
- n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > offset ?
- (unsigned)offset : state->x.have;
- state->x.have -= n;
- state->x.next += n;
- state->x.pos += n;
- offset -= n;
- }
-
- /* request skip (if not zero) */
- if (offset) {
- state->seek = 1;
- state->skip = offset;
- }
- return state->x.pos + offset;
-}
-
-/* -- see zlib.h -- */
-z_off_t ZEXPORT gzseek(file, offset, whence)
- gzFile file;
- z_off_t offset;
- int whence;
-{
- z_off64_t ret;
-
- ret = gzseek64(file, (z_off64_t)offset, whence);
- return ret == (z_off_t)ret ? (z_off_t)ret : -1;
-}
-
-/* -- see zlib.h -- */
-z_off64_t ZEXPORT gztell64(file)
- gzFile file;
-{
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return -1;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return -1;
-
- /* return position */
- return state->x.pos + (state->seek ? state->skip : 0);
-}
-
-/* -- see zlib.h -- */
-z_off_t ZEXPORT gztell(file)
- gzFile file;
-{
- z_off64_t ret;
-
- ret = gztell64(file);
- return ret == (z_off_t)ret ? (z_off_t)ret : -1;
-}
-
-/* -- see zlib.h -- */
-z_off64_t ZEXPORT gzoffset64(file)
- gzFile file;
-{
- z_off64_t offset;
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return -1;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return -1;
-
- /* compute and return effective offset in file */
- offset = LSEEK(state->fd, 0, SEEK_CUR);
- if (offset == -1)
- return -1;
- if (state->mode == GZ_READ) /* reading */
- offset -= state->strm.avail_in; /* don't count buffered input */
- return offset;
-}
-
-/* -- see zlib.h -- */
-z_off_t ZEXPORT gzoffset(file)
- gzFile file;
-{
- z_off64_t ret;
-
- ret = gzoffset64(file);
- return ret == (z_off_t)ret ? (z_off_t)ret : -1;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzeof(file)
- gzFile file;
-{
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return 0;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return 0;
-
- /* return end-of-file state */
- return state->mode == GZ_READ ? state->past : 0;
-}
-
-/* -- see zlib.h -- */
-const char * ZEXPORT gzerror(file, errnum)
- gzFile file;
- int *errnum;
-{
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return NULL;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return NULL;
-
- /* return error information */
- if (errnum != NULL)
- *errnum = state->err;
- return state->err == Z_MEM_ERROR ? "out of memory" :
- (state->msg == NULL ? "" : state->msg);
-}
-
-/* -- see zlib.h -- */
-void ZEXPORT gzclearerr(file)
- gzFile file;
-{
- gz_statep state;
-
- /* get internal structure and check integrity */
- if (file == NULL)
- return;
- state = (gz_statep)file;
- if (state->mode != GZ_READ && state->mode != GZ_WRITE)
- return;
-
- /* clear error and end-of-file */
- if (state->mode == GZ_READ) {
- state->eof = 0;
- state->past = 0;
- }
- gz_error(state, Z_OK, NULL);
-}
-
-/* Create an error message in allocated memory and set state->err and
- state->msg accordingly. Free any previous error message already there. Do
- not try to free or allocate space if the error is Z_MEM_ERROR (out of
- memory). Simply save the error message as a static string. If there is an
- allocation failure constructing the error message, then convert the error to
- out of memory. */
-void ZLIB_INTERNAL gz_error(state, err, msg)
- gz_statep state;
- int err;
- const char *msg;
-{
- /* free previously allocated message and clear */
- if (state->msg != NULL) {
- if (state->err != Z_MEM_ERROR)
- free(state->msg);
- state->msg = NULL;
- }
-
- /* if fatal, set state->x.have to 0 so that the gzgetc() macro fails */
- if (err != Z_OK && err != Z_BUF_ERROR)
- state->x.have = 0;
-
- /* set error code, and if no message, then done */
- state->err = err;
- if (msg == NULL)
- return;
-
- /* for an out of memory error, return literal string when requested */
- if (err == Z_MEM_ERROR)
- return;
-
- /* construct error message with path */
- if ((state->msg = (char *)malloc(strlen(state->path) + strlen(msg) + 3)) ==
- NULL) {
- state->err = Z_MEM_ERROR;
- return;
- }
-#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
- (void)snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
- "%s%s%s", state->path, ": ", msg);
-#else
- strcpy(state->msg, state->path);
- strcat(state->msg, ": ");
- strcat(state->msg, msg);
-#endif
-}
-
-#ifndef INT_MAX
-/* portably return maximum value for an int (when limits.h presumed not
- available) -- we need to do this to cover cases where 2's complement not
- used, since C standard permits 1's complement and sign-bit representations,
- otherwise we could just use ((unsigned)-1) >> 1 */
-unsigned ZLIB_INTERNAL gz_intmax()
-{
- unsigned p, q;
-
- p = 1;
- do {
- q = p;
- p <<= 1;
- p++;
- } while (p > q);
- return q >> 1;
-}
-#endif
projects / reactos.git / blobdiff