mirror of https://github.com/zeldaret/mm.git
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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// displays an error message and exits
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void util_fatal_error(const char* msgfmt, ...) {
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va_list args;
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fputs(ERRMSG_START, stderr);
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va_start(args, msgfmt);
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vfprintf(stderr, msgfmt, args);
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va_end(args);
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fputs(ERRMSG_END "\n", stderr);
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exit(1);
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}
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// reads a whole file into memory, and returns a malloc'd pointer to the data.
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void* util_read_whole_file(const char* filename, size_t* pSize) {
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FILE* file = fopen(filename, "rb");
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uint8_t* buffer;
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size_t size;
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if (file == NULL)
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util_fatal_error("failed to open file '%s' for reading: %s", filename, strerror(errno));
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// get size
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fseek(file, 0, SEEK_END);
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size = ftell(file);
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// allocate buffer
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buffer = malloc(size + 1);
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// read file
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fseek(file, 0, SEEK_SET);
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if (fread(buffer, size, 1, file) != 1)
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util_fatal_error("error reading from file '%s': %s", filename, strerror(errno));
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// null-terminate the buffer (in case of text files)
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buffer[size] = 0;
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fclose(file);
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if (pSize != NULL)
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*pSize = size;
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return buffer;
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}
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// writes data to file
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void util_write_whole_file(const char* filename, const void* data, size_t size) {
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FILE* file = fopen(filename, "wb");
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if (file == NULL)
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util_fatal_error("failed to open file '%s' for writing: %s", filename, strerror(errno));
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if (fwrite(data, size, 1, file) != 1)
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util_fatal_error("error writing to file '%s': %s", filename, strerror(errno));
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fclose(file);
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}
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uint32_t util_read_uint32_be(const uint8_t* data) {
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return data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3] << 0;
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}
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// writes a big-endian 32-bit integer
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void util_write_uint32_be(uint8_t* data, uint32_t val) {
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data[0] = val >> 24;
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data[1] = val >> 16;
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data[2] = val >> 8;
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data[3] = val >> 0;
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}
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