static int
add_data(zip_t *za, zip_source_t *src, zip_dirent_t *de)
{
zip_int64_t offstart, offdata, offend;
struct zip_stat st;
zip_source_t *s2;
int ret;
int is_zip64;
zip_flags_t flags;
if (zip_source_stat(src, &st) < 0) {
_zip_error_set_from_source(&za->error, src);
return -1;
}
if ((st.valid & ZIP_STAT_COMP_METHOD) == 0) {
st.valid |= ZIP_STAT_COMP_METHOD;
st.comp_method = ZIP_CM_STORE;
}
if (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method != ZIP_CM_STORE)
de->comp_method = st.comp_method;
else if (de->comp_method == ZIP_CM_STORE && (st.valid & ZIP_STAT_SIZE)) {
st.valid |= ZIP_STAT_COMP_SIZE;
st.comp_size = st.size;
}
else {
/* we'll recompress */
st.valid &= ~ZIP_STAT_COMP_SIZE;
}
flags = ZIP_EF_LOCAL;
if ((st.valid & ZIP_STAT_SIZE) == 0)
flags |= ZIP_FL_FORCE_ZIP64;
else {
de->uncomp_size = st.size;
if ((st.valid & ZIP_STAT_COMP_SIZE) == 0) {
if (( ((de->comp_method == ZIP_CM_DEFLATE || ZIP_CM_IS_DEFAULT(de->comp_method)) && st.size > MAX_DEFLATE_SIZE_32)
|| (de->comp_method != ZIP_CM_STORE && de->comp_method != ZIP_CM_DEFLATE && !ZIP_CM_IS_DEFAULT(de->comp_method))))
flags |= ZIP_FL_FORCE_ZIP64;
}
else
de->comp_size = st.comp_size;
}
if ((offstart = zip_source_tell_write(za->src)) < 0) {
return -1;
}
/* as long as we don't support non-seekable output, clear data descriptor bit */
de->bitflags &= (zip_uint16_t)~ZIP_GPBF_DATA_DESCRIPTOR;
if ((is_zip64=_zip_dirent_write(za, de, flags)) < 0)
return -1;
if (st.comp_method == ZIP_CM_STORE || (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method != de->comp_method)) {
zip_source_t *s_store, *s_crc;
zip_compression_implementation comp_impl;
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 -1;
}
if ((s_store=comp_impl(za, src, st.comp_method, ZIP_CODEC_DECODE)) == NULL) {
/* error set by comp_impl */
return -1;
}
}
else {
/* to have the same reference count to src as in the case where it's not stored */
zip_source_keep(src);
s_store = src;
}
s_crc = zip_source_crc(za, s_store, 0);
zip_source_free(s_store);
if (s_crc == NULL) {
return -1;
}
if (de->comp_method != ZIP_CM_STORE && ((st.valid & ZIP_STAT_SIZE) == 0 || st.size != 0)) {
if ((comp_impl=_zip_get_compression_implementation(de->comp_method)) == NULL) {
zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
zip_source_free(s_crc);
return -1;
}
s2 = comp_impl(za, s_crc, de->comp_method, ZIP_CODEC_ENCODE);
zip_source_free(s_crc);
if (s2 == NULL) {
return -1;
}
}
else {
s2 = s_crc;
}
}
else {
zip_source_keep(src);
s2 = src;
}
if ((offdata = zip_source_tell_write(za->src)) < 0) {
return -1;
}
ret = copy_source(za, s2);
if (zip_source_stat(s2, &st) < 0)
ret = -1;
zip_source_free(s2);
if (ret < 0)
return -1;
if ((offend = zip_source_tell_write(za->src)) < 0) {
return -1;
}
if (zip_source_seek_write(za->src, offstart, SEEK_SET) < 0) {
_zip_error_set_from_source(&za->error, za->src);
return -1;
}
if ((st.valid & (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) != (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) {
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
return -1;
}
if ((de->changed & ZIP_DIRENT_LAST_MOD) == 0) {
if (st.valid & ZIP_STAT_MTIME)
de->last_mod = st.mtime;
else
time(&de->last_mod);
}
de->comp_method = st.comp_method;
de->crc = st.crc;
de->uncomp_size = st.size;
de->comp_size = (zip_uint64_t)(offend - offdata);
if ((ret=_zip_dirent_write(za, de, flags)) < 0)
return -1;
if (is_zip64 != ret) {
/* Zip64 mismatch between preliminary file header written before data and final file header written afterwards */
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
return -1;
}
if (zip_source_seek_write(za->src, offend, SEEK_SET) < 0) {
_zip_error_set_from_source(&za->error, za->src);
return -1;
}
return 0;
}
static int
add_data(struct zip *za, struct zip_source *src, struct zip_dirent *de, FILE *ft)
{
off_t offstart, offdata, offend;
struct zip_stat st;
struct zip_source *s2;
int ret;
int is_zip64;
zip_flags_t flags;
if (zip_source_stat(src, &st) < 0) {
_zip_error_set_from_source(&za->error, src);
return -1;
}
if ((st.valid & ZIP_STAT_COMP_METHOD) == 0) {
st.valid |= ZIP_STAT_COMP_METHOD;
st.comp_method = ZIP_CM_STORE;
}
if (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method != ZIP_CM_STORE)
de->comp_method = st.comp_method;
else if (de->comp_method == ZIP_CM_STORE && (st.valid & ZIP_STAT_SIZE)) {
st.valid |= ZIP_STAT_COMP_SIZE;
st.comp_size = st.size;
}
else {
/* we'll recompress */
st.valid &= ~ZIP_STAT_COMP_SIZE;
}
flags = ZIP_EF_LOCAL;
if ((st.valid & ZIP_STAT_SIZE) == 0)
flags |= ZIP_FL_FORCE_ZIP64;
else {
de->uncomp_size = st.size;
if ((st.valid & ZIP_STAT_COMP_SIZE) == 0) {
if (( ((de->comp_method == ZIP_CM_DEFLATE || ZIP_CM_IS_DEFAULT(de->comp_method)) && st.size > MAX_DEFLATE_SIZE_32)
|| (de->comp_method != ZIP_CM_STORE && de->comp_method != ZIP_CM_DEFLATE && !ZIP_CM_IS_DEFAULT(de->comp_method))))
flags |= ZIP_FL_FORCE_ZIP64;
}
else
de->comp_size = st.comp_size;
}
offstart = ftello(ft);
/* as long as we don't support non-seekable output, clear data descriptor bit */
de->bitflags &= ~ZIP_GPBF_DATA_DESCRIPTOR;
if ((is_zip64=_zip_dirent_write(de, ft, flags, &za->error)) < 0)
return -1;
if (st.comp_method == ZIP_CM_STORE || (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method != de->comp_method)) {
struct zip_source *s_store, *s_crc;
zip_compression_implementation comp_impl;
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 -1;
}
if ((s_store=comp_impl(za, src, st.comp_method, ZIP_CODEC_DECODE)) == NULL) {
/* error set by comp_impl */
return -1;
}
}
else
s_store = src;
if ((s_crc=zip_source_crc(za, s_store, 0)) == NULL) {
if (s_store != src)
zip_source_pop(s_store);
return -1;
}
/* TODO: deflate 0-byte files for torrentzip? */
if (de->comp_method != ZIP_CM_STORE && ((st.valid & ZIP_STAT_SIZE) == 0 || st.size != 0)) {
if ((comp_impl=_zip_get_compression_implementation(de->comp_method)) == NULL) {
_zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
zip_source_pop(s_crc);
if (s_store != src)
zip_source_pop(s_store);
return -1;
}
if ((s2=comp_impl(za, s_crc, de->comp_method, ZIP_CODEC_ENCODE)) == NULL) {
zip_source_pop(s_crc);
if (s_store != src)
zip_source_pop(s_store);
return -1;
}
}
else
s2 = s_crc;
}
else
s2 = src;
offdata = ftello(ft);
ret = copy_source(za, s2, ft);
if (zip_source_stat(s2, &st) < 0)
ret = -1;
while (s2 != src) {
if ((s2=zip_source_pop(s2)) == NULL) {
/* TODO: set erorr */
ret = -1;
break;
}
}
if (ret < 0)
return -1;
offend = ftello(ft);
if (fseeko(ft, offstart, SEEK_SET) < 0) {
_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
return -1;
}
if ((st.valid & (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) != (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) {
_zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
return -1;
}
if (st.valid & ZIP_STAT_MTIME)
de->last_mod = st.mtime;
else
time(&de->last_mod);
de->comp_method = st.comp_method;
de->crc = st.crc;
de->uncomp_size = st.size;
de->comp_size = (zip_uint64_t)(offend - offdata);
if (zip_get_archive_flag(za, ZIP_AFL_TORRENT, 0))
_zip_dirent_torrent_normalize(de);
if ((ret=_zip_dirent_write(de, ft, flags, &za->error)) < 0)
return -1;
if (is_zip64 != ret) {
/* Zip64 mismatch between preliminary file header written before data and final file header written afterwards */
_zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
return -1;
}
if (fseeko(ft, offend, SEEK_SET) < 0) {
_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
return -1;
}
return 0;
}
zip_fopen_index_encrypted(struct zip *za, zip_uint64_t fileno, int flags,
const char *password)
{
struct zip_file *zf;
zip_compression_implementation comp_impl;
zip_encryption_implementation enc_impl;
struct zip_source *src, *s2;
zip_uint64_t start;
struct zip_stat st;
if (fileno >= za->nentry) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return NULL;
}
if ((flags & ZIP_FL_UNCHANGED) == 0
&& ZIP_ENTRY_DATA_CHANGED(za->entry+fileno)) {
_zip_error_set(&za->error, ZIP_ER_CHANGED, 0);
return NULL;
}
if (fileno >= za->cdir->nentry) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return NULL;
}
if (flags & ZIP_FL_ENCRYPTED)
flags |= ZIP_FL_COMPRESSED;
zip_stat_index(za, fileno, flags, &st);
enc_impl = NULL;
if ((flags & ZIP_FL_ENCRYPTED) == 0) {
if (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 ((start=_zip_file_get_offset(za, fileno)) == 0)
return NULL;
if (st.comp_size == 0) {
if ((src=zip_source_buffer(za, NULL, 0, 0)) == NULL)
return NULL;
}
else {
if ((src=_zip_source_file_or_p(za, NULL, za->zp, start, st.comp_size,
0, &st)) == NULL)
return NULL;
if (enc_impl) {
if ((s2=enc_impl(za, src, ZIP_EM_TRAD_PKWARE, 0,
password)) == NULL) {
zip_source_free(src);
/* XXX: set error (how?) */
return NULL;
}
src = s2;
}
if (comp_impl) {
if ((s2=comp_impl(za, src, za->cdir->entry[fileno].comp_method,
0)) == NULL) {
zip_source_free(src);
/* XXX: set error (how?) */
return NULL;
}
src = s2;
}
if ((flags & ZIP_FL_COMPRESSED) == 0
|| st.comp_method == ZIP_CM_STORE ) {
if ((s2=zip_source_crc(za, src, 1)) == NULL) {
zip_source_free(src);
/* XXX: set error (how?) */
return NULL;
}
src = s2;
}
}
if (zip_source_open(src) < 0) {
_zip_error_set_from_source(&za->error, src);
zip_source_free(src);
return NULL;
}
zf = _zip_file_new(za);
zf->src = src;
return zf;
}
static int
add_data(struct zip *za, struct zip_source *src, struct zip_dirent *de,
FILE *ft)
{
off_t offstart, offdata, offend;
struct zip_stat st;
struct zip_source *s2;
zip_compression_implementation comp_impl;
int ret;
if (zip_source_stat(src, &st) < 0) {
_zip_error_set_from_source(&za->error, src);
return -1;
}
offstart = ftello(ft);
if (_zip_dirent_write(de, ft, 1, &za->error) < 0)
return -1;
if ((s2=zip_source_crc(za, src, 0)) == NULL) {
zip_source_pop(s2);
return -1;
}
/* XXX: deflate 0-byte files for torrentzip? */
if (((st.valid & ZIP_STAT_COMP_METHOD) == 0
|| st.comp_method == ZIP_CM_STORE)
&& ((st.valid & ZIP_STAT_SIZE) == 0 || st.size != 0)) {
comp_impl = NULL;
if ((comp_impl=zip_get_compression_implementation(ZIP_CM_DEFLATE))
== NULL) {
_zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
zip_source_pop(s2);
return -1;
}
if ((s2=comp_impl(za, s2, ZIP_CM_DEFLATE, ZIP_CODEC_ENCODE))
== NULL) {
/* XXX: set error? */
zip_source_pop(s2);
return -1;
}
}
else
s2 = src;
offdata = ftello(ft);
ret = copy_source(za, s2, ft);
if (zip_source_stat(s2, &st) < 0)
ret = -1;
while (s2 != src) {
if ((s2=zip_source_pop(s2)) == NULL) {
/* XXX: set erorr */
ret = -1;
break;
}
}
if (ret < 0)
return -1;
offend = ftello(ft);
if (fseeko(ft, offstart, SEEK_SET) < 0) {
_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
return -1;
}
de->last_mod = st.mtime;
de->comp_method = st.comp_method;
de->crc = st.crc;
de->uncomp_size = st.size;
de->comp_size = offend - offdata;
if (zip_get_archive_flag(za, ZIP_AFL_TORRENT, 0))
_zip_dirent_torrent_normalize(de);
if (_zip_dirent_write(de, ft, 1, &za->error) < 0)
return -1;
if (fseeko(ft, offend, SEEK_SET) < 0) {
_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
return -1;
}
return 0;
}
static int
add_data(zip_t *za, zip_source_t *src, zip_dirent_t *de)
{
zip_int64_t offstart, offdata, offend;
struct zip_stat st;
zip_source_t *src_final, *src_tmp;
int ret;
int is_zip64;
zip_flags_t flags;
bool needs_recompress, needs_decompress, needs_crc, needs_compress, needs_reencrypt, needs_decrypt, needs_encrypt;
if (zip_source_stat(src, &st) < 0) {
_zip_error_set_from_source(&za->error, src);
return -1;
}
if ((st.valid & ZIP_STAT_COMP_METHOD) == 0) {
st.valid |= ZIP_STAT_COMP_METHOD;
st.comp_method = ZIP_CM_STORE;
}
if (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method != ZIP_CM_STORE)
de->comp_method = st.comp_method;
else if (de->comp_method == ZIP_CM_STORE && (st.valid & ZIP_STAT_SIZE)) {
st.valid |= ZIP_STAT_COMP_SIZE;
st.comp_size = st.size;
}
else {
/* we'll recompress */
st.valid &= ~ZIP_STAT_COMP_SIZE;
}
if ((st.valid & ZIP_STAT_ENCRYPTION_METHOD) == 0) {
st.valid |= ZIP_STAT_ENCRYPTION_METHOD;
st.encryption_method = ZIP_EM_NONE;
}
flags = ZIP_EF_LOCAL;
if ((st.valid & ZIP_STAT_SIZE) == 0)
flags |= ZIP_FL_FORCE_ZIP64;
else {
de->uncomp_size = st.size;
if ((st.valid & ZIP_STAT_COMP_SIZE) == 0) {
if (( ((de->comp_method == ZIP_CM_DEFLATE || ZIP_CM_IS_DEFAULT(de->comp_method)) && st.size > MAX_DEFLATE_SIZE_32)
|| (de->comp_method != ZIP_CM_STORE && de->comp_method != ZIP_CM_DEFLATE && !ZIP_CM_IS_DEFAULT(de->comp_method))))
flags |= ZIP_FL_FORCE_ZIP64;
}
else
de->comp_size = st.comp_size;
}
if ((offstart = zip_source_tell_write(za->src)) < 0) {
return -1;
}
/* as long as we don't support non-seekable output, clear data descriptor bit */
de->bitflags &= (zip_uint16_t)~ZIP_GPBF_DATA_DESCRIPTOR;
if ((is_zip64=_zip_dirent_write(za, de, flags)) < 0)
return -1;
needs_recompress = !((st.comp_method == de->comp_method) || (ZIP_CM_IS_DEFAULT(de->comp_method) && st.comp_method == ZIP_CM_DEFLATE));
needs_decompress = needs_recompress && (st.comp_method != ZIP_CM_STORE);
needs_crc = (st.comp_method == ZIP_CM_STORE) || needs_decompress;
needs_compress = needs_recompress && (de->comp_method != ZIP_CM_STORE);
needs_reencrypt = needs_recompress || (de->changed & ZIP_DIRENT_PASSWORD) || (de->encryption_method != st.encryption_method);
needs_decrypt = needs_reencrypt && (st.encryption_method != ZIP_EM_NONE);
needs_encrypt = needs_reencrypt && (de->encryption_method != ZIP_EM_NONE);
src_final = src;
zip_source_keep(src_final);
if (needs_decrypt) {
zip_encryption_implementation impl;
if ((impl = _zip_get_encryption_implementation(st.encryption_method, ZIP_CODEC_DECODE)) == NULL) {
zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
zip_source_free(src_final);
return -1;
}
if ((src_tmp = impl(za, src_final, st.encryption_method, ZIP_CODEC_DECODE, za->default_password)) == NULL) {
/* error set by impl */
zip_source_free(src_final);
return -1;
}
zip_source_free(src_final);
src_final = src_tmp;
}
if (needs_decompress) {
zip_compression_implementation comp_impl;
if ((comp_impl = _zip_get_compression_implementation(st.comp_method, ZIP_CODEC_DECODE)) == NULL) {
zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
zip_source_free(src_final);
return -1;
}
if ((src_tmp = comp_impl(za, src_final, st.comp_method, ZIP_CODEC_DECODE)) == NULL) {
/* error set by comp_impl */
zip_source_free(src_final);
return -1;
}
zip_source_free(src_final);
src_final = src_tmp;
}
if (needs_crc) {
if ((src_tmp = zip_source_crc(za, src_final, 0)) == NULL) {
zip_source_free(src_final);
return -1;
}
zip_source_free(src_final);
src_final = src_tmp;
}
if (needs_compress) {
zip_compression_implementation comp_impl;
if ((comp_impl = _zip_get_compression_implementation(de->comp_method, ZIP_CODEC_ENCODE)) == NULL) {
zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
zip_source_free(src_final);
return -1;
}
if ((src_tmp = comp_impl(za, src_final, de->comp_method, ZIP_CODEC_ENCODE)) == NULL) {
zip_source_free(src_final);
return -1;
}
zip_source_free(src_final);
src_final = src_tmp;
}
if (needs_encrypt) {
zip_encryption_implementation impl;
const char *password = NULL;
if (de->password) {
password = de->password;
} else if (za->default_password) {
password = za->default_password;
}
if ((impl = _zip_get_encryption_implementation(de->encryption_method, ZIP_CODEC_ENCODE)) == NULL) {
zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
zip_source_free(src_final);
return -1;
}
if ((src_tmp = impl(za, src_final, de->encryption_method, ZIP_CODEC_ENCODE, password)) == NULL) {
/* error set by impl */
zip_source_free(src_final);
return -1;
}
zip_source_free(src_final);
src_final = src_tmp;
}
if ((offdata = zip_source_tell_write(za->src)) < 0) {
return -1;
}
ret = copy_source(za, src_final);
if (zip_source_stat(src_final, &st) < 0) {
ret = -1;
}
zip_source_free(src_final);
if (ret < 0) {
return -1;
}
if ((offend = zip_source_tell_write(za->src)) < 0) {
return -1;
}
if (zip_source_seek_write(za->src, offstart, SEEK_SET) < 0) {
_zip_error_set_from_source(&za->error, za->src);
return -1;
}
if ((st.valid & (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) != (ZIP_STAT_COMP_METHOD|ZIP_STAT_CRC|ZIP_STAT_SIZE)) {
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
return -1;
}
if ((de->changed & ZIP_DIRENT_LAST_MOD) == 0) {
if (st.valid & ZIP_STAT_MTIME)
de->last_mod = st.mtime;
else
time(&de->last_mod);
}
de->comp_method = st.comp_method;
de->crc = st.crc;
de->uncomp_size = st.size;
de->comp_size = (zip_uint64_t)(offend - offdata);
if ((ret=_zip_dirent_write(za, de, flags)) < 0)
return -1;
if (is_zip64 != ret) {
/* Zip64 mismatch between preliminary file header written before data and final file header written afterwards */
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
return -1;
}
if (zip_source_seek_write(za->src, offend, SEEK_SET) < 0) {
_zip_error_set_from_source(&za->error, za->src);
return -1;
}
return 0;
}
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;
/* XXX: 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 {
/* XXX: 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);
/* XXX: 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);
/* XXX: 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);
/* XXX: 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);
/* XXX: set error (how?) (why?) */
return NULL;
}
src = s2;
}
}
return src;
}
