diff options
Diffstat (limited to 'tools/common.h')
| -rw-r--r-- | tools/common.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/common.h b/tools/common.h index 3664703ea..2010e9e9d 100644 --- a/tools/common.h +++ b/tools/common.h @@ -25,6 +25,15 @@ void *malloc_verbose(size_t size) { return m; } +void *calloc_verbose(size_t size) { + errno = 0; + void *m = calloc(size, 1); + if (!m) { + error_exit("Could not allocate %zu bytes: %s\n", size, strerror(errno)); + } + return m; +} + FILE *fopen_verbose(const char *filename, char rw) { char mode[3] = {rw, 'b', '\0'}; errno = 0; @@ -100,4 +109,19 @@ uint32_t read_png_width_verbose(const char *filename) { return (bytes[0] << 24) | (bytes[1] << 16) | (bytes[2] << 8) | bytes[3]; } +void read_dimensions(const char *filename, int *width) { + long filesize; + uint8_t *bytes = read_u8(filename, &filesize); + if (filesize != 1) { + error_exit("%s: invalid dimensions file\n", filename); + } + uint8_t dimensions = bytes[0]; + free(bytes); + *width = dimensions & 0xF; + int height = dimensions >> 4; + if (*width != height || (*width != 5 && *width != 6 && *width != 7)) { + error_exit("%s: invalid dimensions: %dx%d tiles\n", filename, *width, height); + } +} + #endif // GUARD_COMMON_H |