diff options
Diffstat (limited to 'ext/zip/lib/zip_source_zip_new.c')
| -rw-r--r-- | ext/zip/lib/zip_source_zip_new.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/ext/zip/lib/zip_source_zip_new.c b/ext/zip/lib/zip_source_zip_new.c new file mode 100644 index 0000000000..353489a653 --- /dev/null +++ b/ext/zip/lib/zip_source_zip_new.c @@ -0,0 +1,172 @@ +/* + zip_source_zip_new.c -- prepare data structures for zip_fopen/zip_source_zip + Copyright (C) 2012 Dieter Baron and Thomas Klausner + + This file is part of libzip, a library to manipulate ZIP archives. + The authors can be contacted at <libzip@nih.at> + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + 3. The names of the authors may not be used to endorse or promote + products derived from this software without specific prior + written permission. + + THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS + OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY + DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER + IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + + + +#include <stdlib.h> + +#include "zipint.h" + + + +struct zip_source * +_zip_source_zip_new(struct zip *za, struct zip *srcza, zip_uint64_t srcidx, zip_flags_t flags, + zip_uint64_t start, zip_uint64_t len, const char *password) +{ + zip_compression_implementation comp_impl; + zip_encryption_implementation enc_impl; + struct zip_source *src, *s2; + zip_uint64_t offset; + struct zip_stat st; + + if (za == NULL) + return NULL; + + if (srcza == NULL || srcidx >= srcza->nentry) { + _zip_error_set(&za->error, ZIP_ER_INVAL, 0); + return NULL; + } + + if ((flags & ZIP_FL_UNCHANGED) == 0 + && (ZIP_ENTRY_DATA_CHANGED(srcza->entry+srcidx) || srcza->entry[srcidx].deleted)) { + _zip_error_set(&za->error, ZIP_ER_CHANGED, 0); + return NULL; + } + + if (zip_stat_index(srcza, srcidx, flags|ZIP_FL_UNCHANGED, &st) < 0) { + _zip_error_set(&za->error, ZIP_ER_INTERNAL, 0); + return NULL; + } + + if (flags & ZIP_FL_ENCRYPTED) + flags |= ZIP_FL_COMPRESSED; + + if ((start > 0 || len > 0) && (flags & ZIP_FL_COMPRESSED)) { + _zip_error_set(&za->error, ZIP_ER_INVAL, 0); + return NULL; + } + + /* overflow or past end of file */ + if ((start > 0 || len > 0) && (start+len < start || start+len > st.size)) { + _zip_error_set(&za->error, ZIP_ER_INVAL, 0); + return NULL; + } + + enc_impl = NULL; + if (((flags & ZIP_FL_ENCRYPTED) == 0) && (st.encryption_method != ZIP_EM_NONE)) { + if (password == NULL) { + _zip_error_set(&za->error, ZIP_ER_NOPASSWD, 0); + return NULL; + } + if ((enc_impl=_zip_get_encryption_implementation(st.encryption_method)) == NULL) { + _zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0); + return NULL; + } + } + + comp_impl = NULL; + if ((flags & ZIP_FL_COMPRESSED) == 0) { + if (st.comp_method != ZIP_CM_STORE) { + if ((comp_impl=_zip_get_compression_implementation(st.comp_method)) == NULL) { + _zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0); + return NULL; + } + } + } + + if ((offset=_zip_file_get_offset(srcza, srcidx, &za->error)) == 0) + return NULL; + + if (st.comp_size == 0) { + if ((src=zip_source_buffer(za, NULL, 0, 0)) == NULL) + return NULL; + } + else { + if (start+len > 0 && enc_impl == NULL && comp_impl == NULL) { + struct zip_stat st2; + + st2.size = len ? len : st.size-start; + st2.comp_size = st2.size; + st2.comp_method = ZIP_CM_STORE; + st2.mtime = st.mtime; + st2.valid = ZIP_STAT_SIZE|ZIP_STAT_COMP_SIZE|ZIP_STAT_COMP_METHOD|ZIP_STAT_MTIME; + + /* TODO: check for overflow of st2.size */ + if ((src=_zip_source_file_or_p(za, NULL, srcza->zp, offset+start, (zip_int64_t)st2.size, 0, &st2)) == NULL) + return NULL; + } + else { + /* TODO: check for overflow of st.comp_size */ + if ((src=_zip_source_file_or_p(za, NULL, srcza->zp, offset, (zip_int64_t)st.comp_size, 0, &st)) == NULL) + return NULL; + } + + if (enc_impl) { + if ((s2=enc_impl(za, src, st.encryption_method, 0, password)) == NULL) { + zip_source_free(src); + /* TODO: set error (how?) */ + return NULL; + } + src = s2; + } + if (comp_impl) { + if ((s2=comp_impl(za, src, st.comp_method, 0)) == NULL) { + zip_source_free(src); + /* TODO: set error (how?) */ + return NULL; + } + src = s2; + } + if (((flags & ZIP_FL_COMPRESSED) == 0 || st.comp_method == ZIP_CM_STORE) + && (len == 0 || len == st.comp_size)) { + /* when reading the whole file, check for crc errors */ + if ((s2=zip_source_crc(za, src, 1)) == NULL) { + zip_source_free(src); + /* TODO: set error (how?) */ + return NULL; + } + src = s2; + } + + if (start+len > 0 && (comp_impl || enc_impl)) { + if ((s2=zip_source_window(za, src, start, len ? len : st.size-start)) == NULL) { + zip_source_free(src); + /* TODO: set error (how?) (why?) */ + return NULL; + } + src = s2; + } + } + + return src; +} |