56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
// SPDX-License-Identifier: ISC
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#pragma once
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#include <inttypes.h>
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#include <stddef.h>
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typedef struct {
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int fd;
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// offset is in 4KiB units
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size_t offset;
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} y16t_idx_t;
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// try to lookup the given coordinates,
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// and return the corresponding location via `result`.
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// the file given as `fh` is expected to be at least 256KiB large
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// returns a negative errno number in case of failure
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__attribute__((nonnull))
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int y16t_idx_lookup(
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y16t_idx_t idx,
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uint8_t x,
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uint8_t y,
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uint32_t *result
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);
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// update a table entry.
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int y16t_idx_update(
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y16t_idx_t idx,
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uint8_t x,
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uint8_t y,
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uint32_t newval
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);
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// insert a table entry if it doesn't already exist
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int y16t_idx_get_or_insert(
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y16t_idx_t idx,
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uint8_t x,
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uint8_t y,
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uint32_t *value,
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uint32_t (*palloc)(void*),
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void *context
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);
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// iterate over columns or rows
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int y16t_idx_foreach_x(
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y16t_idx_t idx,
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uint8_t y,
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int (*callback)(uint8_t, uint32_t, void*),
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void *context
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);
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int y16t_idx_foreach_y(
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y16t_idx_t idx,
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uint8_t χ,
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int (*callback)(uint8_t, uint32_t, void*),
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void *context
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);
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