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-rw-r--r--zlib/gzlib.c165
1 files changed, 124 insertions, 41 deletions
diff --git a/zlib/gzlib.c b/zlib/gzlib.c
index 603e60ed5444..ca55c6ea9265 100644
--- a/zlib/gzlib.c
+++ b/zlib/gzlib.c
@@ -1,19 +1,23 @@
/* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004, 2010 Mark Adler
+ * Copyright (C) 2004, 2010, 2011, 2012 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#include "gzguts.h"
+#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 *));
+local gzFile gz_open OF((const void *, int, const char *));
#if defined UNDER_CE
@@ -71,25 +75,37 @@ char ZLIB_INTERNAL *gz_strwinerror (error)
local void gz_reset(state)
gz_statep state;
{
+ 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 */
- state->direct = 1; /* default for empty file */
}
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)
- const char *path;
+ const void *path;
int fd;
const char *mode;
{
gz_statep state;
+ 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));
@@ -103,6 +119,7 @@ local gzFile gz_open(path, fd, 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';
@@ -124,6 +141,16 @@ local gzFile gz_open(path, fd, mode)
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;
@@ -135,6 +162,8 @@ local gzFile gz_open(path, fd, mode)
break;
case 'F':
state->strategy = Z_FIXED;
+ case 'T':
+ state->direct = 1;
default: /* could consider as an error, but just ignore */
;
}
@@ -147,30 +176,67 @@ local gzFile gz_open(path, fd, mode)
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 */
- state->path = malloc(strlen(path) + 1);
+#ifdef _WIN32
+ if (fd == -2) {
+ len = wcstombs(NULL, path, 0);
+ if (len == (size_t)-1)
+ len = 0;
+ }
+ else
+#endif
+ len = strlen(path);
+ state->path = malloc(len + 1);
if (state->path == NULL) {
free(state);
return NULL;
}
- strcpy(state->path, path);
+#ifdef _WIN32
+ if (fd == -2)
+ if (len)
+ wcstombs(state->path, path, len + 1);
+ else
+ *(state->path) = 0;
+ else
+#endif
+ strcpy(state->path, path);
- /* open the file with the appropriate mode (or just use fd) */
- state->fd = fd != -1 ? fd :
- open(path,
+ /* compute the flags for open() */
+ oflag =
#ifdef O_LARGEFILE
- O_LARGEFILE |
+ O_LARGEFILE |
#endif
#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 | (
- state->mode == GZ_WRITE ?
- O_TRUNC :
- O_APPEND))),
- 0666);
+ (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 _WIN32
+ fd == -2 ? _wopen(path, oflag, 0666) :
+#endif
+ open(path, oflag, 0666));
if (state->fd == -1) {
free(state->path);
free(state);
@@ -225,6 +291,16 @@ gzFile ZEXPORT gzdopen(fd, mode)
}
/* -- see zlib.h -- */
+#ifdef _WIN32
+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;
@@ -243,8 +319,8 @@ int ZEXPORT gzbuffer(file, size)
return -1;
/* check and set requested size */
- if (size == 0)
- return -1;
+ if (size < 2)
+ size = 2; /* need two bytes to check magic header */
state->want = size;
return 0;
}
@@ -261,7 +337,8 @@ int ZEXPORT gzrewind(file)
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 */
@@ -289,7 +366,7 @@ z_off64_t ZEXPORT gzseek64(file, offset, whence)
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 */
@@ -298,31 +375,32 @@ z_off64_t ZEXPORT gzseek64(file, offset, whence)
/* 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 == COPY &&
- state->pos + offset >= state->raw) {
- ret = LSEEK(state->fd, offset - state->have, SEEK_CUR);
+ state->x.pos + offset >= 0) {
+ ret = LSEEK(state->fd, offset - 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 */
@@ -331,11 +409,11 @@ z_off64_t ZEXPORT gzseek64(file, offset, whence)
/* if reading, skip what's in output buffer (one less gzgetc() check) */
if (state->mode == GZ_READ) {
- n = GT_OFF(state->have) || (z_off64_t)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;
}
@@ -344,7 +422,7 @@ z_off64_t ZEXPORT gzseek64(file, offset, whence)
state->seek = 1;
state->skip = offset;
}
- return state->pos + offset;
+ return state->x.pos + offset;
}
/* -- see zlib.h -- */
@@ -373,7 +451,7 @@ z_off64_t ZEXPORT gztell64(file)
return -1;
/* return position */
- return state->pos + (state->seek ? state->skip : 0);
+ return state->x.pos + (state->seek ? state->skip : 0);
}
/* -- see zlib.h -- */
@@ -433,8 +511,7 @@ int ZEXPORT gzeof(file)
return 0;
/* return end-of-file state */
- return state->mode == GZ_READ ?
- (state->eof && state->strm.avail_in == 0 && state->have == 0) : 0;
+ return state->mode == GZ_READ ? state->past : 0;
}
/* -- see zlib.h -- */
@@ -471,8 +548,10 @@ void ZEXPORT gzclearerr(file)
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);
}
@@ -494,6 +573,10 @@ void ZLIB_INTERNAL gz_error(state, err, 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)
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-19 14:10:03 +0000