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103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
#ifndef GUARD_COMMON_H
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#define GUARD_COMMON_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <getopt.h>
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int getopt_long_index;
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#define getopt_long(c, v, s, l) getopt_long(c, v, s, l, &getopt_long_index)
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void *malloc_verbose(size_t size) {
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void *m = malloc(size);
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if (!m) {
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fprintf(stderr, "Could not allocate %zu bytes: %s\n", size, strerror(errno));
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exit(1);
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}
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return m;
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}
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FILE *fopen_verbose(const char *filename, char rw) {
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char mode[3] = {rw, 'b', '\0'};
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FILE *f = fopen(filename, mode);
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if (!f) {
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fprintf(stderr, "Could not open file \"%s\": %s\n", filename, strerror(errno));
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exit(1);
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}
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return f;
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}
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void fread_verbose(uint8_t *data, size_t size, const char *filename, FILE *f) {
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if (fread(data, 1, size, f) != size) {
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fprintf(stderr, "Could not read from file \"%s\": %s\n", filename, strerror(errno));
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fclose(f);
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exit(1);
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}
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}
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void fwrite_verbose(const uint8_t *data, size_t size, const char *filename, FILE *f) {
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if (fwrite(data, 1, size, f) != size) {
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fprintf(stderr, "Could not write to file \"%s\": %s\n", filename, strerror(errno));
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fclose(f);
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exit(1);
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}
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}
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long file_size(const char *filename, FILE *f) {
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long size = 0;
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if (!fseek(f, 0, SEEK_END)) {
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size = ftell(f);
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if (size != -1) {
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rewind(f);
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}
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}
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if (errno) {
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fprintf(stderr, "Could not measure file \"%s\": %s\n", filename, strerror(errno));
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exit(1);
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}
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return size;
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}
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uint8_t *read_u8(const char *filename, long *size) {
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FILE *f = fopen_verbose(filename, 'r');
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*size = file_size(filename, f);
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uint8_t *data = malloc_verbose(*size);
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fread_verbose(data, *size, filename, f);
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fclose(f);
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return data;
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}
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void write_u8(const char *filename, uint8_t *data, size_t size) {
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FILE *f = fopen_verbose(filename, 'w');
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fwrite_verbose(data, size, filename, f);
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fclose(f);
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}
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uint32_t read_png_width_verbose(const char *filename) {
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FILE *f = fopen_verbose(filename, 'r');
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uint8_t header[16] = {0};
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fread_verbose(header, sizeof(header), filename, f);
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static uint8_t expected_header[16] = {
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0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n', // signature
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0, 0, 0, 13, // IHDR chunk length
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'I', 'H', 'D', 'R', // IHDR chunk type
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};
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if (memcmp(header, expected_header, sizeof(header))) {
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fprintf(stderr, "Not a valid PNG file: \"%s\"\n", filename);
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fclose(f);
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exit(1);
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}
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uint8_t bytes[4] = {0};
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fread_verbose(bytes, sizeof(bytes), filename, f);
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fclose(f);
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return (bytes[0] << 24) | (bytes[1] << 16) | (bytes[2] << 8) | bytes[3];
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}
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#endif // GUARD_COMMON_H
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