forked from 0ad/0ad
janwas
dda6268466
- compression: now use "fastest" compression mode and more memory unless in FINAL build. this greatly speeds up archive generation at expense of 1.5% size increase (fine during development). done because profiling shows ZLib accounts for 78% of CPU; practically nothing else shows up, which shows effectiveness of compressing in parallel with reading from disk. - file_cache: documented; fixed several potential issues with exact_buf when invalidating files. This was SVN commit r3586.
94 lines
4.1 KiB
C
94 lines
4.1 KiB
C
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struct BlockId
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{
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const char* atom_fn;
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u32 block_num;
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};
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extern bool block_eq(BlockId b1, BlockId b2);
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// create an id for use with the cache that uniquely identifies
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// the block from the file <atom_fn> starting at <ofs>.
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extern BlockId block_cache_make_id(const char* atom_fn, const off_t ofs);
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extern void* block_cache_alloc(BlockId id);
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extern void block_cache_mark_completed(BlockId id);
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extern void* block_cache_find(BlockId id);
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extern void block_cache_release(BlockId id);
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// allocate a new buffer of <size> bytes (possibly more due to internal
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// fragmentation). never returns 0.
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// <atom_fn>: owner filename (buffer is intended to be used for data from
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// this file).
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// <long_lived>: indicates the buffer will not be freed immediately
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// (i.e. before the next buffer alloc) as it normally should.
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// this flag serves to suppress a warning and better avoid fragmentation.
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// caller sets this when FILE_LONG_LIVED is specified.
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extern FileIOBuf file_buf_alloc(size_t size, const char* atom_fn, bool long_lived);
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// mark <buf> as no longer needed. if its reference count drops to 0,
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// it will be removed from the extant list. if it had been added to the
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// cache, it remains there until evicted in favor of another buffer.
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extern LibError file_buf_free(FileIOBuf buf);
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// interpret file_io parameters (pbuf, size, flags, cb) and allocate a
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// file buffer if necessary.
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// called by file_io and afile_read.
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extern LibError file_buf_get(FileIOBuf* pbuf, size_t size,
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const char* atom_fn, uint flags, FileIOCB cb);
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// inform us that the buffer address will be increased by <padding>-bytes.
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// this happens when reading uncompressed files from archive: they
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// start at unaligned offsets and file_io rounds offset down to
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// next block boundary. the buffer therefore starts with padding, which
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// is skipped so the user only sees their data.
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// we make note of the new buffer address so that it can be freed correctly
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// by passing the new padded buffer.
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extern void file_buf_add_padding(FileIOBuf exact_buf, size_t exact_size, size_t padding);
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// if buf is not in extant list, complain; otherwise, mark it as
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// coming from the file <atom_fn>.
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// this is needed in the following case: uncompressed reads from archive
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// boil down to a file_io of the archive file. the buffer is therefore
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// tagged with the archive filename instead of the desired filename.
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// afile_read sets things right by calling this.
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extern LibError file_buf_set_real_fn(FileIOBuf buf, const char* atom_fn);
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// "give" <buf> to the cache, specifying its size and owner filename.
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// since this data may be shared among users of the cache, it is made
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// read-only (via MMU) to make sure no one can corrupt/change it.
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//
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// note: the reference added by file_buf_alloc still exists! it must
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// still be file_buf_free-d after calling this.
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extern LibError file_cache_add(FileIOBuf buf, size_t size, const char* atom_fn);
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// called by trace simulator to retrieve buffer address, given atom_fn.
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// must not change any cache state (e.g. notify stats or add ref).
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extern FileIOBuf file_cache_find(const char* atom_fn, size_t* psize);
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// check if the contents of the file <atom_fn> are in file cache.
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// if not, return 0; otherwise, return buffer address and optionally
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// pass back its size.
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// <long_lived> indicates whether this file has FILE_LONG_LIVED flag set -
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// see file_buf_alloc docs.
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extern FileIOBuf file_cache_retrieve(const char* atom_fn, size_t* psize, bool long_lived);
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// invalidate all data loaded from the file <fn>. this ensures the next
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// load of this file gets the (presumably new) contents of the file,
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// not previous stale cache contents.
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// call after hotloading code detects file has been changed.
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extern LibError file_cache_invalidate(const char* P_fn);
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// reset entire state of the file cache to what it was after initialization.
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// that means completely emptying the extant list and cache.
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// used after simulating cache operation, which fills the cache with
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// invalid data.
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extern void file_cache_reset();
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extern void file_cache_init();
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extern void file_cache_shutdown();
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