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@ -17,6 +17,7 @@
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ino_t serial_id = (ino_t)1;
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ino_t mem_serial_id = (ino_t)1;
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ino_t cut_out_serial_id = (ino_t)1;
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typedef struct
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{
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@ -175,7 +176,7 @@ int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
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return ISO_OUT_OF_MEM;
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}
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data = malloc(sizeof(FSrcStreamData));
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if (str == NULL) {
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if (data == NULL) {
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free(str);
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return ISO_OUT_OF_MEM;
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}
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@ -212,6 +213,193 @@ int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
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return ISO_SUCCESS;
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}
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struct cut_out_stream
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{
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IsoFileSource *src;
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/* key for file identification inside filesystem */
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dev_t dev_id;
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ino_t ino_id;
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off_t offset; /**< offset where read begins */
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off_t size; /**< size of this file */
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off_t pos; /* position on the file for read */
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};
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static
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int cut_out_open(IsoStream *stream)
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{
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int ret;
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struct stat info;
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IsoFileSource *src;
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struct cut_out_stream *data;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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data = stream->data;
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src = data->src;
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ret = iso_file_source_stat(data->src, &info);
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if (ret < 0) {
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return ret;
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}
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ret = iso_file_source_open(src);
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if (ret < 0) {
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return ret;
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}
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{
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off_t ret;
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if (data->offset > info.st_size) {
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/* file is smaller than expected */
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ret = iso_file_source_lseek(src, info.st_size, 0);
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} else {
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ret = iso_file_source_lseek(src, data->offset, 0);
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}
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if (ret < 0) {
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return (int) ret;
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}
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}
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data->pos = 0;
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if (data->offset + data->size > info.st_size) {
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return 3; /* file smaller than expected */
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} else {
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return ISO_SUCCESS;
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}
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}
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static
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int cut_out_close(IsoStream *stream)
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{
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IsoFileSource *src;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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src = ((struct cut_out_stream*)stream->data)->src;
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return iso_file_source_close(src);
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}
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static
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off_t cut_out_get_size(IsoStream *stream)
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{
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struct cut_out_stream *data = stream->data;
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return data->size;
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}
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static
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int cut_out_read(IsoStream *stream, void *buf, size_t count)
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{
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struct cut_out_stream *data = stream->data;
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count = (size_t)MIN(data->size - data->pos, count);
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if (count == 0) {
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return 0;
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}
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return iso_file_source_read(data->src, buf, count);
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}
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static
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int cut_out_is_repeatable(IsoStream *stream)
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{
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/* reg files are always repeatable */
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return 1;
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}
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static
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void cut_out_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
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ino_t *ino_id)
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{
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FSrcStreamData *data;
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IsoFilesystem *fs;
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data = (FSrcStreamData*)stream->data;
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fs = iso_file_source_get_filesystem(data->src);
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*fs_id = fs->get_id(fs);
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*dev_id = data->dev_id;
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*ino_id = data->ino_id;
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}
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static
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void cut_out_free(IsoStream *stream)
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{
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struct cut_out_stream *data = stream->data;
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iso_file_source_unref(data->src);
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free(data);
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}
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IsoStreamIface cut_out_stream_class = {
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0,
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"cout",
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cut_out_open,
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cut_out_close,
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cut_out_get_size,
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cut_out_read,
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cut_out_is_repeatable,
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cut_out_get_id,
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cut_out_free
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};
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int iso_cut_out_stream_new(IsoFileSource *src, off_t offset, off_t size,
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IsoStream **stream)
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{
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int r;
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struct stat info;
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IsoStream *str;
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struct cut_out_stream *data;
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if (src == NULL || stream == NULL) {
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return ISO_NULL_POINTER;
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}
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if (size == 0) {
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return ISO_WRONG_ARG_VALUE;
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}
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r = iso_file_source_stat(src, &info);
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if (r < 0) {
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return r;
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}
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if (!S_ISREG(info.st_mode)) {
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return ISO_WRONG_ARG_VALUE;
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}
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if (offset > info.st_size) {
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return ISO_FILE_OFFSET_TOO_BIG;
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}
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/* check for read access to contents */
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r = iso_file_source_access(src);
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if (r < 0) {
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return r;
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}
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str = malloc(sizeof(IsoStream));
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if (str == NULL) {
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return ISO_OUT_OF_MEM;
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}
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data = malloc(sizeof(struct cut_out_stream));
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if (data == NULL) {
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free(str);
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return ISO_OUT_OF_MEM;
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}
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/* take a new ref to IsoFileSource */
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data->src = src;
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iso_file_source_ref(src);
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data->offset = offset;
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data->size = MIN(info.st_size - offset, size);
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/* get the id numbers */
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data->dev_id = (dev_t) 0;
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data->ino_id = cut_out_serial_id++;
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str->refcount = 1;
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str->data = data;
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str->class = &cut_out_stream_class;
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*stream = str;
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return ISO_SUCCESS;
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}
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typedef struct
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