/* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004, 2010 Mark Adler
+ * Copyright (C) 2004-2019 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
-#ifndef OLD_GZIO
-
#include "gzguts.h"
-#ifdef _LARGEFILE64_SOURCE
+#if defined(_WIN32) && !defined(__BORLANDC__)
+# 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 char *, int, const char *, int));
+local gzFile gz_open OF((const void *, int, const char *));
-#if defined UNDER_CE && defined NO_ERRNO_H
+#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
The gz_strwinerror function does not change the current setting of
GetLastError. */
-char ZEXPORT *gz_strwinerror (error)
+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);
+ | 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
return buf;
}
-#endif /* UNDER_CE && NO_ERRNO_H */
+#endif /* UNDER_CE */
/* Reset gzip file state */
local void gz_reset(state)
gz_statep state;
{
- state->how = 0; /* look for gzip header */
+ state->x.have = 0; /* no output data available */
if (state->mode == GZ_READ) { /* for reading ... */
- state->have = 0; /* no output data available */
state->eof = 0; /* not at end of file */
+ state->past = 0; /* have not read past end yet */
+ state->how = LOOK; /* look for gzip header */
}
+ else /* for writing ... */
+ state->reset = 0; /* no deflateReset pending */
state->seek = 0; /* no seek request pending */
gz_error(state, Z_OK, NULL); /* clear error */
- state->pos = 0; /* no uncompressed data yet */
+ 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, large)
- const char *path;
+local gzFile gz_open(path, fd, mode)
+ const void *path;
int fd;
const char *mode;
- int large;
{
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 = malloc(sizeof(gz_state));
+ state = (gz_statep)malloc(sizeof(gz_state));
if (state == NULL)
return NULL;
state->size = 0; /* no buffers allocated yet */
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';
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;
break;
case 'F':
state->strategy = Z_FIXED;
+ break;
+ case 'T':
+ state->direct = 1;
+ break;
default: /* could consider as an error, but just ignore */
;
}
return NULL;
}
- /* open the file with the appropriate mode (or just use fd) */
- state->fd = fd != -1 ? fd :
- open(path,
- (large ?
-#ifdef O_LARGEFILE
- O_LARGEFILE
+ /* 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
- 0
+ strcpy(state->path, path);
+#endif
+
+ /* compute the flags for open() */
+ oflag =
+#ifdef O_LARGEFILE
+ O_LARGEFILE |
#endif
- : 0) |
#ifdef O_BINARY
- 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
- (state->mode == GZ_READ ?
- O_RDONLY :
- (O_WRONLY | O_CREAT | (
- state->mode == GZ_WRITE ?
- O_TRUNC :
- O_APPEND))),
- 0666);
+ open((const char *)path, oflag, 0666));
if (state->fd == -1) {
+ free(state->path);
free(state);
return NULL;
}
- if (state->mode == GZ_APPEND)
+ if (state->mode == GZ_APPEND) {
+ LSEEK(state->fd, 0, SEEK_END); /* so gzoffset() is correct */
state->mode = GZ_WRITE; /* simplify later checks */
-
- /* save the path name for error messages */
- state->path = malloc(strlen(path) + 1);
- strcpy(state->path, path);
+ }
/* save the current position for rewinding (only if reading) */
if (state->mode == GZ_READ) {
const char *path;
const char *mode;
{
- return gz_open(path, -1, mode, 0);
+ return gz_open(path, -1, mode);
}
/* -- see zlib.h -- */
const char *path;
const char *mode;
{
- return gz_open(path, -1, mode, 1);
+ return gz_open(path, -1, mode);
}
/* -- see zlib.h -- */
int fd;
const char *mode;
{
- char path[46]; /* identifier for error messages */
+ char *path; /* identifier for error messages */
+ gzFile gz;
- if (fd < 0)
+ if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
return NULL;
-#ifdef NO_snprintf
- sprintf(path, "<fd:%d>", fd); /* big enough for 128-bit integers */
+#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
+ (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd);
#else
- snprintf(path, sizeof(path), "<fd:%d>", fd);
+ sprintf(path, "<fd:%d>", fd); /* for debugging */
#endif
- return gz_open(path, fd, mode, 0);
+ 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)
return -1;
/* check and set requested size */
- if (size == 0)
- return -1;
+ 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;
}
state = (gz_statep)file;
/* check that we're reading and that there's no error */
- if (state->mode != GZ_READ || state->err != Z_OK)
+ if (state->mode != GZ_READ ||
+ (state->err != Z_OK && state->err != Z_BUF_ERROR))
return -1;
/* back up and start over */
return -1;
/* check that there's no error */
- if (state->err != Z_OK)
+ if (state->err != Z_OK && state->err != Z_BUF_ERROR)
return -1;
/* can only seek from start or relative to current position */
/* normalize offset to a SEEK_CUR specification */
if (whence == SEEK_SET)
- offset -= state->pos;
+ 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 == 1 &&
- state->pos + offset >= state->raw) {
- ret = LSEEK(state->fd, offset, SEEK_CUR);
+ if (state->mode == GZ_READ && state->how == COPY &&
+ state->x.pos + offset >= 0) {
+ ret = LSEEK(state->fd, offset - (z_off64_t)state->x.have, SEEK_CUR);
if (ret == -1)
return -1;
- state->have = 0;
+ 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->pos += offset;
- return state->pos;
+ 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->pos;
+ offset += state->x.pos;
if (offset < 0) /* before start of file! */
return -1;
if (gzrewind(file) == -1) /* rewind, then skip to offset */
/* if reading, skip what's in output buffer (one less gzgetc() check) */
if (state->mode == GZ_READ) {
- n = state->have > offset ? (unsigned)offset : state->have;
- state->have -= n;
- state->next += n;
- state->pos += n;
+ 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;
}
state->seek = 1;
state->skip = offset;
}
- return state->pos + offset;
+ return state->x.pos + offset;
}
/* -- see zlib.h -- */
return -1;
/* return position */
- return state->pos + (state->seek ? state->skip : 0);
+ return state->x.pos + (state->seek ? state->skip : 0);
}
/* -- see zlib.h -- */
return 0;
/* return end-of-file state */
- return state->mode == GZ_READ ? (state->eof && state->have == 0) : 0;
+ return state->mode == GZ_READ ? state->past : 0;
}
/* -- see zlib.h -- */
return NULL;
/* return error information */
- *errnum = state->err;
- return state->msg == NULL ? "" : state->msg;
+ if (errnum != NULL)
+ *errnum = state->err;
+ return state->err == Z_MEM_ERROR ? "out of memory" :
+ (state->msg == NULL ? "" : state->msg);
}
/* -- see zlib.h -- */
return;
/* clear error and end-of-file */
- if (state->mode == GZ_READ)
+ if (state->mode == GZ_READ) {
state->eof = 0;
+ state->past = 0;
+ }
gz_error(state, Z_OK, NULL);
}
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 ZEXPORT gz_error(state, err, msg)
+void ZLIB_INTERNAL gz_error(state, err, msg)
gz_statep state;
int err;
const char *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, save as static string */
- if (err == Z_MEM_ERROR) {
- state->msg = (char *)msg;
+ /* 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 = malloc(strlen(state->path) + strlen(msg) + 3)) == NULL) {
+ if ((state->msg = (char *)malloc(strlen(state->path) + strlen(msg) + 3)) ==
+ NULL) {
state->err = Z_MEM_ERROR;
- state->msg = (char *)"out of memory";
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);
- return;
+#endif
}
-#endif /* !OLD_GZIO */
+#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 / zlib.git / blobdiff