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longest_match: avoid using negative indices
Fixes madler#364
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,5 @@ | ||
| # ignore Makefiles; they're all automatically generated | ||
| Makefile | ||
| /switchlevels | ||
| /switchlevels.dSYM/ | ||
| /switchlevels.exe |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| /* Compresses a user-specified number of chunks from stdin into stdout as a single gzip stream. | ||
| * Each chunk is compressed with a user-specified level. | ||
| */ | ||
|
|
||
| #include "zbuild.h" | ||
| #ifdef ZLIB_COMPAT | ||
| # include "zlib.h" | ||
| #else | ||
| # include "zlib-ng.h" | ||
| #endif | ||
|
|
||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
|
|
||
| static int read_all(unsigned char *buf, size_t size) | ||
| { | ||
| for (size_t total_read = 0; total_read < size;) { | ||
| size_t n_read = fread(buf + total_read, 1, size - total_read, stdin); | ||
| if (ferror(stdin)) { | ||
| perror("fread\n"); | ||
| return 1; | ||
| } | ||
| if (n_read == 0) { | ||
| fprintf(stderr, "Premature EOF\n"); | ||
| return 1; | ||
| } | ||
| total_read += n_read; | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| static int write_all(unsigned char *buf, size_t size) | ||
| { | ||
| for (size_t total_written = 0; total_written < size;) { | ||
| size_t n_written = fwrite(buf + total_written, 1, size - total_written, stdout); | ||
| if (ferror(stdout)) { | ||
| perror("fwrite\n"); | ||
| return 1; | ||
| } | ||
| total_written += n_written; | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| static int compress_chunk(PREFIX3(stream) *strm, int level, int size, int last) | ||
| { | ||
| int ret = 1; | ||
| int err = PREFIX(deflateParams)(strm, level, Z_DEFAULT_STRATEGY); | ||
| if (err != Z_OK) { | ||
| fprintf(stderr, "deflateParams() failed with code %d\n", err); | ||
| goto done; | ||
| } | ||
| unsigned long compsize = 100 + 2 * PREFIX(deflateBound)(strm, size); | ||
| unsigned char *buf = malloc(size + compsize); | ||
| if (buf == NULL) { | ||
| fprintf(stderr, "Out of memory\n"); | ||
| goto done; | ||
| } | ||
| if (read_all(buf, size) != 0) { | ||
| goto free_buf; | ||
| } | ||
| strm->next_in = buf; | ||
| strm->avail_in = size; | ||
| strm->next_out = buf + size; | ||
| strm->avail_out = compsize; | ||
| err = PREFIX(deflate)(strm, last ? Z_FINISH : Z_SYNC_FLUSH); | ||
| if ((!last && err != Z_OK) || (last && err != Z_STREAM_END)) { | ||
| fprintf(stderr, "deflate() failed with code %d\n", err); | ||
| goto free_buf; | ||
| } | ||
| if (strm->avail_in != 0) { | ||
| fprintf(stderr, "deflate() did not consume %d bytes of input\n", strm->avail_in); | ||
| goto free_buf; | ||
| } | ||
| if (write_all(buf + size, compsize - strm->avail_out) != 0) { | ||
| goto free_buf; | ||
| } | ||
| ret = 0; | ||
| free_buf: | ||
| free(buf); | ||
| done: | ||
| return ret; | ||
| } | ||
|
|
||
| /* =========================================================================== | ||
| * Usage: switchlevels level1 size1 [level2 size2 ...] | ||
| */ | ||
|
|
||
| int main(int argc, char **argv) | ||
| { | ||
| int ret = EXIT_FAILURE; | ||
| PREFIX3(stream) strm; | ||
| memset(&strm, 0, sizeof(strm)); | ||
| int err = PREFIX(deflateInit2)(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, MAX_WBITS + 16, 8, Z_DEFAULT_STRATEGY); | ||
| if (err != Z_OK) { | ||
| fprintf(stderr, "deflateInit() failed with code %d\n", err); | ||
| goto done; | ||
| } | ||
| for (int i = 1; i < argc - 1; i += 2) { | ||
| int level = atoi(argv[i]); | ||
| int size = atoi(argv[i + 1]); | ||
| if (compress_chunk(&strm, level, size, i + 2 >= argc - 1) != 0) { | ||
| goto deflate_end; | ||
| } | ||
| } | ||
| ret = EXIT_SUCCESS; | ||
| deflate_end: | ||
| PREFIX(deflateEnd)(&strm); | ||
| done: | ||
| return ret; | ||
| } |