90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
#include "lzw.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int decompress_file(char* filename)
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{
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char* outfilename;
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FILE *fp, *outfp;
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int i;
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unsigned int ifnlen, ofnlen;
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struct lzw_ctx* ctx;
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uint8_t bufin[4096], bufout[4096];
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uint8_t *pin, *pout;
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size_t to_decompress, space;
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int res;
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ctx = (struct lzw_ctx*)malloc(sizeof(struct lzw_ctx));
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if (ctx == NULL)
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return 0;
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lzw_init(ctx);
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fp = fopen(filename, "rb");
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if (fp == NULL) {
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perror("fopen()");
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return -1;
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}
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/* NOLINTBEGIN(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling) */
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ifnlen = strlen(filename);
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ofnlen = ifnlen + 5;
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outfilename = (char*)malloc(ofnlen);
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strncpy(outfilename, filename, ofnlen);
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for (i = ifnlen - 1; i > 0 && outfilename[i] != '/'; i--)
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if (outfilename[i] == '.') {
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outfilename[i] = '\0';
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break;
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}
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if (strcmp(filename, outfilename) == 0)
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strncat(outfilename, ".out", ofnlen);
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/* NOLINTEND(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling) */
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printf("Writing to %s\n", outfilename);
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outfp = fopen(outfilename, "wb");
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if (outfp == NULL) {
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perror("fopen()");
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free(outfilename);
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return -1;
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}
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to_decompress = 0;
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space = sizeof(bufout);
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pout = bufout;
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while (ctx->eos == 0) {
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if (to_decompress == 0) {
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to_decompress = fread(bufin, 1, sizeof(bufin), fp);
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pin = bufin;
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}
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if (space == 0) {
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fwrite(bufout, 1, sizeof(bufout), outfp);
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space = sizeof(bufout);
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pout = bufout;
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}
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res = lzw_decompress(ctx, pin, &to_decompress, pout, &space);
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pin = bufin + sizeof(bufin) - to_decompress;
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pout = bufout + sizeof(bufout) - space;
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}
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if (space < sizeof(bufout))
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fwrite(bufout, 1, sizeof(bufout) - space, outfp);
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free(outfilename);
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fclose(outfp);
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fclose(fp);
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return 0;
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}
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int main(int argc, char* argv[])
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{
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int i;
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for (i = 1; i < argc; i++) {
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printf("Decompressing %s\n", argv[i]);
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decompress_file(argv[i]);
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}
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return EXIT_SUCCESS;
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}
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