mirror of
https://github.com/simtactics/mysimulation.git
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78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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static void read_bytes(FILE *fp, uint8_t *dest, size_t size)
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{
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size_t bytes_copied;
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if (!size)
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return;
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bytes_copied = fread(dest, 1, size, fp);
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if (bytes_copied < size) {
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if (ferror(fp))
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fprintf(stderr, "error: fread failed: %s\n", strerror(errno));
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else
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fprintf(stderr, "error: unexpected end of file\n");
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exit(EXIT_FAILURE);
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}
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}
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static uint32_t read_u32(FILE *fp)
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{
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uint8_t dest[4];
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read_bytes(fp, dest, sizeof(dest));
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return dest[0] | (dest[1] << 8) | (dest[2] << 16) | (dest[3] << 24);
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}
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static uint16_t read_u16(FILE *fp)
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{
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uint8_t dest[2];
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read_bytes(fp, dest, sizeof(dest));
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return dest[0] | (dest[1] << 8);
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}
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static uint16_t read_u8(FILE *fp)
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{
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uint8_t dest;
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read_bytes(fp, &dest, sizeof(dest));
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return dest;
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}
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static void write_bytes(FILE *fp, const uint8_t *dest, size_t size)
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{
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if (!size)
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return;
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if (fwrite(dest, 1, size, fp) != size) {
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fprintf(stderr, "error: fwrite failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
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}
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}
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static void write_u32(FILE *fp, uint32_t x)
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{
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uint8_t dest[4];
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dest[0] = (uint8_t)x;
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dest[1] = (uint8_t)(x>>8);
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dest[2] = (uint8_t)(x>>16);
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dest[3] = (uint8_t)(x>>24);
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write_bytes(fp, dest, sizeof(dest));
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}
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static void write_u16(FILE *fp, uint16_t x)
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{
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uint8_t dest[2];
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dest[0] = (uint8_t)x;
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dest[1] = (uint8_t)(x>>8);
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write_bytes(fp, dest, sizeof(dest));
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}
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static void write_u8(FILE *fp, uint8_t x)
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{
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write_bytes(fp, &x, sizeof(x));
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}
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