#include "libbb.h"
-ssize_t safe_read(int fd, void *buf, size_t count)
+#define ZIPPED (ENABLE_FEATURE_SEAMLESS_LZMA \
+ || ENABLE_FEATURE_SEAMLESS_BZ2 \
+ || ENABLE_FEATURE_SEAMLESS_GZ \
+ /* || ENABLE_FEATURE_SEAMLESS_Z */ \
+)
+
+#if ZIPPED
+#include "unarchive.h"
+#endif
+
+ssize_t FAST_FUNC safe_read(int fd, void *buf, size_t count)
{
ssize_t n;
* which detects EAGAIN and uses poll() to wait on the fd.
* Thankfully, poll() doesn't care about O_NONBLOCK flag.
*/
-ssize_t nonblock_safe_read(int fd, void *buf, size_t count)
+ssize_t FAST_FUNC nonblock_safe_read(int fd, void *buf, size_t count)
{
struct pollfd pfd[1];
ssize_t n;
* Returns the amount read, or -1 on an error.
* A short read is returned on an end of file.
*/
-ssize_t full_read(int fd, void *buf, size_t len)
+ssize_t FAST_FUNC full_read(int fd, void *buf, size_t len)
{
ssize_t cc;
ssize_t total;
return total;
}
-// Die with an error message if we can't read the entire buffer.
-void xread(int fd, void *buf, size_t count)
+/* Die with an error message if we can't read the entire buffer. */
+void FAST_FUNC xread(int fd, void *buf, size_t count)
{
if (count) {
ssize_t size = full_read(fd, buf, count);
- if (size != count)
+ if ((size_t)size != count)
bb_error_msg_and_die("short read");
}
}
-// Die with an error message if we can't read one character.
-unsigned char xread_char(int fd)
+/* Die with an error message if we can't read one character. */
+unsigned char FAST_FUNC xread_char(int fd)
{
char tmp;
xread(fd, &tmp, 1);
return tmp;
}
-// Read one line a-la fgets. Works only on seekable streams
-char *reads(int fd, char *buffer, size_t size)
-{
- char *p;
-
- if (size < 2)
- return NULL;
- size = full_read(fd, buffer, size-1);
- if ((ssize_t)size <= 0)
- return NULL;
-
- buffer[size] = '\0';
- p = strchr(buffer, '\n');
- if (p) {
- off_t offset;
- *p++ = '\0';
- // avoid incorrect (unsigned) widening
- offset = (off_t)(p - buffer) - (off_t)size;
- // set fd position right after '\n'
- if (offset && lseek(fd, offset, SEEK_CUR) == (off_t)-1)
- return NULL;
- }
- return buffer;
-}
-
// Reads one line a-la fgets (but doesn't save terminating '\n').
// Reads byte-by-byte. Useful when it is important to not read ahead.
// Bytes are appended to pfx (which must be malloced, or NULL).
-char *xmalloc_reads(int fd, char *buf, size_t *maxsz_p)
+char* FAST_FUNC xmalloc_reads(int fd, char *buf, size_t *maxsz_p)
{
char *p;
size_t sz = buf ? strlen(buf) : 0;
- size_t maxsz = maxsz_p ? *maxsz_p : MAXINT(size_t);
+ size_t maxsz = maxsz_p ? *maxsz_p : (INT_MAX - 4095);
goto jump_in;
while (sz < maxsz) {
- if (p - buf == sz) {
+ if ((size_t)(p - buf) == sz) {
jump_in:
buf = xrealloc(buf, sz + 128);
p = buf + sz;
return xrealloc(buf, p - buf);
}
-ssize_t read_close(int fd, void *buf, size_t size)
+ssize_t FAST_FUNC read_close(int fd, void *buf, size_t size)
{
/*int e;*/
size = full_read(fd, buf, size);
return size;
}
-ssize_t open_read_close(const char *filename, void *buf, size_t size)
+ssize_t FAST_FUNC open_read_close(const char *filename, void *buf, size_t size)
{
int fd = open(filename, O_RDONLY);
if (fd < 0)
return read_close(fd, buf, size);
}
+
+// Read (potentially big) files in one go. File size is estimated
+// by stat. Extra '\0' byte is appended.
+void* FAST_FUNC xmalloc_read(int fd, size_t *maxsz_p)
+{
+ char *buf;
+ size_t size, rd_size, total;
+ size_t to_read;
+ struct stat st;
+
+ to_read = maxsz_p ? *maxsz_p : (INT_MAX - 4095); /* max to read */
+
+ /* Estimate file size */
+ st.st_size = 0; /* in case fstat fails, assume 0 */
+ fstat(fd, &st);
+ /* /proc/N/stat files report st_size 0 */
+ /* In order to make such files readable, we add small const */
+ size = (st.st_size | 0x3ff) + 1;
+
+ total = 0;
+ buf = NULL;
+ while (1) {
+ if (to_read < size)
+ size = to_read;
+ buf = xrealloc(buf, total + size + 1);
+ rd_size = full_read(fd, buf + total, size);
+ if ((ssize_t)rd_size == (ssize_t)(-1)) { /* error */
+ free(buf);
+ return NULL;
+ }
+ total += rd_size;
+ if (rd_size < size) /* EOF */
+ break;
+ if (to_read <= rd_size)
+ break;
+ to_read -= rd_size;
+ /* grow by 1/8, but in [1k..64k] bounds */
+ size = ((total / 8) | 0x3ff) + 1;
+ if (size > 64*1024)
+ size = 64*1024;
+ }
+ buf = xrealloc(buf, total + 1);
+ buf[total] = '\0';
+
+ if (maxsz_p)
+ *maxsz_p = total;
+ return buf;
+}
+
+#ifdef USING_LSEEK_TO_GET_SIZE
+/* Alternatively, file size can be obtained by lseek to the end.
+ * The code is slightly bigger. Retained in case fstat approach
+ * will not work for some weird cases (/proc, block devices, etc).
+ * (NB: lseek also can fail to work for some weird files) */
+
// Read (potentially big) files in one go. File size is estimated by
// lseek to end.
-void *xmalloc_open_read_close(const char *filename, size_t *sizep)
+void* FAST_FUNC xmalloc_open_read_close(const char *filename, size_t *maxsz_p)
{
char *buf;
- size_t size = sizep ? *sizep : INT_MAX;
+ size_t size;
int fd;
off_t len;
- fd = xopen(filename, O_RDONLY);
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
/* /proc/N/stat files report len 0 here */
/* In order to make such files readable, we add small const */
- len = xlseek(fd, 0, SEEK_END) | 0x3ff; /* + up to 1k */
- xlseek(fd, 0, SEEK_SET);
- if (len < size)
- size = len;
+ size = 0x3ff; /* read only 1k on unseekable files */
+ len = lseek(fd, 0, SEEK_END) | 0x3ff; /* + up to 1k */
+ if (len != (off_t)-1) {
+ xlseek(fd, 0, SEEK_SET);
+ size = maxsz_p ? *maxsz_p : (INT_MAX - 4095);
+ if (len < size)
+ size = len;
+ }
+
buf = xmalloc(size + 1);
size = read_close(fd, buf, size);
- if ((ssize_t)size < 0)
- bb_perror_msg_and_die("'%s'", filename);
- xrealloc(buf, size + 1);
+ if ((ssize_t)size < 0) {
+ free(buf);
+ return NULL;
+ }
+ buf = xrealloc(buf, size + 1);
buf[size] = '\0';
- if (sizep)
- *sizep = size;
+
+ if (maxsz_p)
+ *maxsz_p = size;
+ return buf;
+}
+#endif
+
+// Read (potentially big) files in one go. File size is estimated
+// by stat.
+void* FAST_FUNC xmalloc_open_read_close(const char *filename, size_t *maxsz_p)
+{
+ char *buf;
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ buf = xmalloc_read(fd, maxsz_p);
+ close(fd);
+ return buf;
+}
+
+void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p)
+{
+ void *buf = xmalloc_open_read_close(filename, maxsz_p);
+ if (!buf)
+ bb_perror_msg_and_die("can't read '%s'", filename);
return buf;
}
+
+int FAST_FUNC open_zipped(const char *fname)
+{
+#if !ZIPPED
+ return open(fname, O_RDONLY);
+#else
+ unsigned char magic[2];
+ char *sfx;
+ int fd;
+#if BB_MMU
+ IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
+ enum { xformer_prog = 0 };
+#else
+ enum { xformer = 0 };
+ const char *xformer_prog;
+#endif
+
+ fd = open(fname, O_RDONLY);
+ if (fd < 0)
+ return fd;
+
+ sfx = strrchr(fname, '.');
+ if (sfx) {
+ if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, ".lzma") == 0)
+ /* .lzma has no header/signature, just trust it */
+ open_transformer(fd, unpack_lzma_stream, "unlzma");
+ else
+ if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, ".gz") == 0)
+ || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, ".bz2") == 0)
+ ) {
+ /* .gz and .bz2 both have 2-byte signature, and their
+ * unpack_XXX_stream wants this header skipped. */
+ xread(fd, &magic, 2);
+#if ENABLE_FEATURE_SEAMLESS_GZ
+#if BB_MMU
+ xformer = unpack_gz_stream;
+#else
+ xformer_prog = "gunzip";
+#endif
+#endif
+ if (!ENABLE_FEATURE_SEAMLESS_GZ
+ || magic[0] != 0x1f || magic[1] != 0x8b
+ ) {
+ if (!ENABLE_FEATURE_SEAMLESS_BZ2
+ || magic[0] != 'B' || magic[1] != 'Z'
+ ) {
+ bb_error_msg_and_die("no gzip"
+ IF_FEATURE_SEAMLESS_BZ2("/bzip2")
+ " magic");
+ }
+#if BB_MMU
+ xformer = unpack_bz2_stream;
+#else
+ xformer_prog = "bunzip2";
+#endif
+ } else {
+#if !BB_MMU
+ /* NOMMU version of open_transformer execs
+ * an external unzipper that wants
+ * file position at the start of the file */
+ xlseek(fd, 0, SEEK_SET);
+#endif
+ }
+ open_transformer(fd, xformer, xformer_prog);
+ }
+ }
+
+ return fd;
+#endif
+}
+
+void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p)
+{
+ int fd;
+ char *image;
+
+ fd = open_zipped(fname);
+ if (fd < 0)
+ return NULL;
+
+ image = xmalloc_read(fd, maxsz_p);
+ if (!image)
+ bb_perror_msg("read error from '%s'", fname);
+ close(fd);
+
+ return image;
+}