summaryrefslogtreecommitdiff
path: root/lib/sqfs/io.c
diff options
context:
space:
mode:
authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-15 17:56:07 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-15 17:59:00 +0200
commit8ee3ee9c71418dbdb73d4350c17056024fb7ec41 (patch)
tree28416eda2893ed28750c29b41b64d783a1aaa35d /lib/sqfs/io.c
parentab2d7fd8bfb1eafc61953e74757e84ed407b1f21 (diff)
Replace file descriptor IO in data_writer with sqfs_file_t
First, this commit moves the create-blocks-from-fd function over to libsquashfs and ports it to work on an sqfs_file_t instead. Second, the function in the data_writer that reads from a file descriptor is adjusted to use an sqfs_file_t instead. Finally, the tools that use it have to be adjusted accordingly. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/io.c')
-rw-r--r--lib/sqfs/io.c146
1 files changed, 17 insertions, 129 deletions
diff --git a/lib/sqfs/io.c b/lib/sqfs/io.c
index f8773d0..4afb489 100644
--- a/lib/sqfs/io.c
+++ b/lib/sqfs/io.c
@@ -9,143 +9,31 @@
#include "sqfs/io.h"
#include "sqfs/error.h"
+#include "sqfs/block_processor.h"
+#include "util.h"
#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-
-typedef struct {
- sqfs_file_t base;
-
- uint64_t size;
- int fd;
-} sqfs_file_stdio_t;
-
-
-static void stdio_destroy(sqfs_file_t *base)
-{
- sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
-
- close(file->fd);
- free(file);
-}
-
-static int stdio_read_at(sqfs_file_t *base, uint64_t offset,
- void *buffer, size_t size)
-{
- sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
- ssize_t ret;
-
- while (size > 0) {
- ret = pread(file->fd, buffer, size, offset);
-
- if (ret < 0) {
- if (errno == EINTR)
- continue;
- return SQFS_ERROR_IO;
- }
-
- if (ret == 0)
- return SQFS_ERROR_OUT_OF_BOUNDS;
-
- buffer = (char *)buffer + ret;
- size -= ret;
- offset += ret;
- }
-
- return 0;
-}
-
-static int stdio_write_at(sqfs_file_t *base, uint64_t offset,
- const void *buffer, size_t size)
+int sqfs_file_create_block(sqfs_file_t *file, uint64_t offset,
+ size_t size, void *user, uint32_t flags,
+ sqfs_block_t **out)
{
- sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
- ssize_t ret;
-
- while (size > 0) {
- ret = pwrite(file->fd, buffer, size, offset);
-
- if (ret < 0) {
- if (errno == EINTR)
- continue;
- return SQFS_ERROR_IO;
- }
+ sqfs_block_t *blk = alloc_flex(sizeof(*blk), 1, size);
+ int err;
- if (ret == 0)
- return SQFS_ERROR_OUT_OF_BOUNDS;
+ if (blk == NULL)
+ return SQFS_ERROR_ALLOC;
- buffer = (const char *)buffer + ret;
- size -= ret;
- offset += ret;
+ err = file->read_at(file, offset, blk->data, size);
+ if (err) {
+ free(blk);
+ return err;
}
- if (offset >= file->size)
- file->size = offset;
+ blk->user = user;
+ blk->size = size;
+ blk->flags = flags;
+ *out = blk;
return 0;
}
-
-static uint64_t stdio_get_size(const sqfs_file_t *base)
-{
- const sqfs_file_stdio_t *file = (const sqfs_file_stdio_t *)base;
-
- return file->size;
-}
-
-static int stdio_truncate(sqfs_file_t *base, uint64_t size)
-{
- sqfs_file_stdio_t *file = (sqfs_file_stdio_t *)base;
-
- if (ftruncate(file->fd, size))
- return SQFS_ERROR_IO;
-
- file->size = size;
- return 0;
-}
-
-
-sqfs_file_t *sqfs_open_file(const char *filename, int flags)
-{
- sqfs_file_stdio_t *file;
- int open_mode, temp;
- sqfs_file_t *base;
-
- if (flags & ~SQFS_FILE_OPEN_ALL_FLAGS) {
- errno = EINVAL;
- return NULL;
- }
-
- file = calloc(1, sizeof(*file));
- base = (sqfs_file_t *)file;
- if (file == NULL)
- return NULL;
-
- if (flags & SQFS_FILE_OPEN_READ_ONLY) {
- open_mode = O_RDONLY;
- } else {
- open_mode = O_CREAT | O_RDWR;
-
- if (flags & SQFS_FILE_OPEN_OVERWRITE) {
- open_mode |= O_TRUNC;
- } else {
- open_mode |= O_EXCL;
- }
- }
-
- file->fd = open(filename, open_mode, 0600);
- if (file->fd < 0) {
- temp = errno;
- free(file);
- errno = temp;
- return NULL;
- }
-
- base->destroy = stdio_destroy;
- base->read_at = stdio_read_at;
- base->write_at = stdio_write_at;
- base->get_size = stdio_get_size;
- base->truncate = stdio_truncate;
- return base;
-}