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49 lines
1.4 KiB
49 lines
1.4 KiB
/* |
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Copyright 2020 Google LLC |
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Use of this source code is governed by a BSD-style |
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license that can be found in the LICENSE file or at |
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https://developers.google.com/open-source/licenses/bsd |
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*/ |
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#ifndef REFTABLE_BLOCKSOURCE_H |
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#define REFTABLE_BLOCKSOURCE_H |
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#include <stdint.h> |
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/* block_source is a generic wrapper for a seekable readable file. |
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*/ |
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struct reftable_block_source { |
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struct reftable_block_source_vtable *ops; |
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void *arg; |
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}; |
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/* a contiguous segment of bytes. It keeps track of its generating block_source |
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* so it can return itself into the pool. */ |
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struct reftable_block { |
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uint8_t *data; |
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int len; |
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struct reftable_block_source source; |
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}; |
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/* block_source_vtable are the operations that make up block_source */ |
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struct reftable_block_source_vtable { |
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/* returns the size of a block source */ |
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uint64_t (*size)(void *source); |
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/* reads a segment from the block source. It is an error to read |
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beyond the end of the block */ |
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int (*read_block)(void *source, struct reftable_block *dest, |
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uint64_t off, uint32_t size); |
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/* mark the block as read; may return the data back to malloc */ |
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void (*return_block)(void *source, struct reftable_block *blockp); |
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/* release all resources associated with the block source */ |
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void (*close)(void *source); |
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}; |
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/* opens a file on the file system as a block_source */ |
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int reftable_block_source_from_file(struct reftable_block_source *block_src, |
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const char *name); |
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#endif
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