diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
---|---|---|
committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /support/dktools/test-rld.ctr |
Initial commit
Diffstat (limited to 'support/dktools/test-rld.ctr')
-rw-r--r-- | support/dktools/test-rld.ctr | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/support/dktools/test-rld.ctr b/support/dktools/test-rld.ctr new file mode 100644 index 0000000000..2bd2984ceb --- /dev/null +++ b/support/dktools/test-rld.ctr @@ -0,0 +1,112 @@ + +#include <stdio.h> +#include "dk4rld.h" +#include "dk4edstm.h" + +/* + Example file for run-length decoding. + The program reads data from standard input, applies + run-length decoding and writes result data to standard + output. + + For better understanding we only do minimal diagnostics + here (set exit status code). + In real world programs one would issue more diagnostics + on problems. +*/ + + +int main(int argc, char *argv[]) +{ + dk4_rl_dec_t dec; /* Decoder */ + const unsigned char *ucptr; /* Address of output buffer */ + size_t sz; /* Number of output characters */ + size_t i; /* Current output char index */ +#if DK4_ON_WINDOWS + int oldimode; /* Old file mode for stdin */ + int oldomode; /* Old file mode for stdout */ +#endif + int ic; /* Current input char from stdin */ + int stopped = 0; /* Flag: EOD found */ + int exval = 0; /* Exit status code */ + + /* On Windows we must set stdin and stdout to binary mode explicitly. + */ +#if DK4_ON_WINDOWS + oldimode = _setmode(_fileno(stdin), _O_BINARY); + oldomode = _setmode(_fileno(stdout), _O_BINARY); +#endif + + /* Initialize decoder + */ + dk4rld_init(&dec, NULL); + + /* Process standard input. + */ + while (EOF != (ic = fgetc(stdin))) { + if (1 == stopped) { + stopped = 2; + /* Error: Addtional bytes after EOD marker */ + } + switch (dk4rld_add(&dec, (unsigned char)ic, NULL)) { + case DK4_EDSTM_FINISHED : { + ucptr = NULL; sz = 0; + if (0 != dk4rld_output(&ucptr, &sz, &dec, NULL)) { + if ((NULL != ucptr) && (0 < sz)) { + for (i = 0; i < sz; i++) { + if (EOF == fputc((int)(ucptr[i]), stdout)) { + exval = 1; + /* Error: Failed to write to standard output */ + } + } + } + } + } break; + case DK4_EDSTM_STOP : { + if (0 == stopped) { stopped = 1; } + } break; + case DK4_EDSTM_ERROR : { + exval = 1; + /* Error: Not properly run-length encoded data */ + } break; + } + } + + /* If successful so far, process final data from decoder + and check for syntax error. + */ + if (0 == exval) { + switch (dk4rld_finish(&dec, NULL)) { + case DK4_EDSTM_FINISHED : { + ucptr = NULL; sz = 0; + if (0 != dk4rld_output(&ucptr, &sz, &dec, NULL)) { + if ((NULL != ucptr) && (0 < sz)) { + for (i = 0; i < sz; i++) { + if (EOF == fputc((int)(ucptr[i]), stdout)) { + exval = 1; + /* Error: Failed to write to standard output */ + } + } + } + } + } break; + case DK4_EDSTM_ERROR : { + exval = 1; + /* Error: Not properly run-length encoded data */ + } break; + } + } + + /* Restore previous file mode for stdin and stdout on Windows. + */ +#if DK4_ON_WINDOWS + fflush(stdout); + _setmode(_fileno(stdout), oldomode); + _setmode(_fileno(stdin), oldimode); +#endif + + /* Exit, indicate success or error. + */ + exit(exval); return exval; +} + |