zip_source_seek.c File Reference

#include "zipint.h"

Go to the source code of this file.

Functions
ZIP_EXTERN int	zip_source_seek (zip_source_t *src, zip_int64_t offset, int whence)
zip_int64_t	zip_source_seek_compute_offset (zip_uint64_t offset, zip_uint64_t length, void *data, zip_uint64_t data_length, zip_error_t *error)

Function Documentation

zip_source_seek()

ZIP_EXTERN int zip_source_seek	(	zip_source_t *	src,
		zip_int64_t	offset,
		int	whence
	)

Definition at line 39 of file zip_source_seek.c.

                                                                   {
    zip_source_args_seek_t args;
 
    if (src->source_closed) {
        return -1;
    }
    if (!ZIP_SOURCE_IS_OPEN_READING(src) || (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END)) {
        zip_error_set(&src->error, ZIP_ER_INVAL, 0);
        return -1;
    }
 
    args.offset = offset;
    args.whence = whence;
 
    if (_zip_source_call(src, &args, sizeof(args), ZIP_SOURCE_SEEK) < 0) {
        return -1;
    }
 
    src->eof = 0;
    return 0;
}

References _zip_source_call(), args, SEEK_CUR, SEEK_END, SEEK_SET, src, ZIP_ER_INVAL, zip_error_set(), ZIP_SOURCE_IS_OPEN_READING, and ZIP_SOURCE_SEEK.

Referenced by _zip_checkcons(), _zip_dirent_size(), _zip_file_get_end(), _zip_file_get_offset(), _zip_find_central_dir(), _zip_read_cdir(), _zip_read_eocd64(), _zip_read_local_ef(), crc_read(), window_read(), zip_close(), and zip_fseek().

zip_source_seek_compute_offset()

zip_int64_t zip_source_seek_compute_offset	(	zip_uint64_t	offset,
		zip_uint64_t	length,
		void *	data,
		zip_uint64_t	data_length,
		zip_error_t *	error
	)

Definition at line 63 of file zip_source_seek.c.

                                                                                                                                   {
    zip_int64_t new_offset;
    zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, data_length, error);
 
    if (args == NULL) {
        return -1;
    }
 
    switch (args->whence) {
    case SEEK_CUR:
        new_offset = (zip_int64_t)offset + args->offset;
        break;
 
    case SEEK_END:
        new_offset = (zip_int64_t)length + args->offset;
        break;
 
    case SEEK_SET:
        new_offset = args->offset;
        break;
 
    default:
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return -1;
    }
 
    if (new_offset < 0 || (zip_uint64_t)new_offset > length) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return -1;
    }
 
    return new_offset;
}

References args, error(), length, NULL, SEEK_CUR, SEEK_END, SEEK_SET, ZIP_ER_INVAL, zip_error_set(), and ZIP_SOURCE_GET_ARGS.

Referenced by buffer_seek(), read_file(), and window_read().