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When asking the meta data reader for its current position and
we *just* read to the end of a block, report the start of the
next block as the current location.
Otherwise, trying to *seek* to the resulting position immediately
after reporting throws an out-of-bounds error.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Technically, this should *never* **ever** happen, because a SquashFS
file always starts with a super block, which isn't wrapped in a meta
data block, so a valid SquashFS file will never have a reason to read
from offset 0.
However, this does bite us when doing unit tests where the meta reader
and writer are used on an otherwise empty file. When trying to read
from offset 0, the caching code assumes that we already have that
block, since tha block_offset got initialized to 0.
This commit changes the initialization to set the current block
location to the maximum 64 bit integer, a location we are never
going to read from, since it will always be after the limit.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This patch adds a deep-copy callback to sqfs_object_t and removes the
copying mechanism from sqfs_compressor_t. This is also interesting for
other types.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Make every dynamically allocated, opaque data structure inherit from
a common sqfs_object_t structure with common entry points (e.g. destroy).
This removes tons of public API functions and replaces them with a
simple sqfs_destroy instead. If semantics of the (until now implicit)
object system need to be extended, it can be much more conveniantely
done this way.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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There were only a hand full of instances outside libsquashfs that used
the alloc code. In most cases, the thing allocated hat its size derived
from something already in memory anyway, so it is safe to assume its
size fits into a size_t.
At the same time, the opencoded Windows path conversion functions are
all unified into a single helper function.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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In most cases, including unistd.h and fcntl.h was a left over anyway.
In the cases where it was not, move it to compat.h.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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ssize_t is only available on POSIX platforms and even there it is
only defined to hold at least -1 in the range of negative numbers.
This commit replaces ssize_t return types with sqfs_s32 and the
coresponding function arguments with sqfs_u32. Because the range
of positiv numbers for a signed 32 bit number is only half that of
the unsigned version, additional checks have to be added.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is a fully automated search and replace, i.e. I ran this:
git grep -l uint8_t | xargs sed -i 's/uint8_t/sqfs_u8/g'
git grep -l uint16_t | xargs sed -i 's/uint16_t/sqfs_u16/g'
git grep -l uint32_t | xargs sed -i 's/uint32_t/sqfs_u32/g'
git grep -l uint64_t | xargs sed -i 's/uint64_t/sqfs_u64/g'
git grep -l int8_t | xargs sed -i 's/int8_t/sqfs_s8/g'
git grep -l int16_t | xargs sed -i 's/int16_t/sqfs_s16/g'
git grep -l int32_t | xargs sed -i 's/int32_t/sqfs_s32/g'
git grep -l int64_t | xargs sed -i 's/int64_t/sqfs_s64/g'
and than added the appropriate definitions to sqfs/predef.h
The whole point being better compatibillity with platforms that may
not have an stdint.h with the propper definitions.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This this commit, the code that is compiled and linked to produce
libsquashfs.so (and *only* libsquashfs.so) is released under the
terms and conditions of the GNU Lesser General Public license,
allowing 3rd party programs to dynamically link against it and still
being able to release their programs under a license of their choosing.
The libutil library is also relicensed, because it is statically linked
into libsquashfs.so. This does not affect the command line programs that
remain under the GPLv3.
At the current time, the two libraries do not contain any 3rd party
contributions and thus do not require anybodys consent other than mine
to change the licensing terms (unlike e.g. libfstree.a).
The libfstree.a and libsqfshelper.a utility libraries will also remain
under the GPLv3 license.
Going forward, some parts of libsqfshelper.a will be moved to
libsquashfs.so. The parts absorbed by libsquashfs.so will then also have
their licensing conditions changed *at that time*.
For the public headers, this commit adds the full boiler-plate comment
about the license, for the source files and internal headers, only the
SPDX identifier is changed.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This should make it easier to use libsquashfs with custom setups that
embedd a squashfs image inside something else. Also, it should make
it easier to port to non unix-like platforms.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This in turn allows for removing most of the header inclusions
within the public headers.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit adds a "predef.h" header to libsquashfs that exposes two
macros, SQFS_API and SQFS_INTERNAL that are used to explicilty set
the visibiliy of stuff that ends up in libsquashfs to default or
hidden.
For compatibillity with Windows which may at some point eventually be
considered, the SQFS_API define is set to dllexport IF the cpp symbol
SQFS_BUILDING_DLL is defined and set to import otherwise.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add sqfs_* prefix to compressor, move implementation prefix up front.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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In all cases where metadata blocks are read, we can roughly (in some
cases even preciesly) say in what range those metadata blocks will be,
so it makes sense to throw an error if an attempt is made to wander
outside this range.
Furthermore, when reading from an uncompressed block, it is more reasonable
to check against the actual block bounds than to padd it with 0 bytes.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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In most cases, we know exactely where the data that we want to read is
on disk, so instead of using read() on the squashfs (or lseek + read),
the code can in many places be cleaned up to use the pread wrapper
read_data_at instead.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Requires that config.h be included before other headers, since the macro
_FILE_OFFSET_BITS changes the definitions of things like 'struct stat'.
I chose to simply include it at the top of every C file and at
immediately after the double-inclusion guards of every header.
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If read_retry fails to read the expected amount of data (EOF or otherwise),
it is almost always an error.
This commit renames read_retry to read_data and moves error handling
into the function, making a lot of error handling code redundant.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Pass in an external destination buffer + size and allow for propper
bounds checking (especially when unpacking).
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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