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/* unzips a file. zipfd points to the open zip file, curzipnode to the entry to extract, and fulldestfilename is the destination file where to unzip it. returns 0 on success, non-zero otherwise. */
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/* unzips a file. zipfd points to the open zip file, curzipnode to the entry to extract, and fulldestfilename is the destination file where to unzip it. returns 0 on success, non-zero otherwise. */
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int zip_unzip(FILE *zipfd, struct ziplist *curzipnode, const char *fulldestfilename) {
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int zip_unzip(FILE *zipfd, struct ziplist *curzipnode, const char *fulldestfilename) {
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#define buffsize 32 * 1024l /* MUST be at least 32K */
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#define buffsize (12 * 1024) /* bigger buffer is better, but pkg has to work on a 256K PC so let's not get too crazy with RAM */
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FILE *filefd;
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FILE *filefd;
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unsigned long cksum;
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unsigned long cksum;
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int extract_res;
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int extract_res;
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unsigned char *buff;
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unsigned char *buff;
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struct utimbuf filetimestamp;
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struct utimbuf filetimestamp;
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crc32_feed(&cksum, buff, toread); /* update the crc32 checksum */
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crc32_feed(&cksum, buff, toread); /* update the crc32 checksum */
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if (fwrite(buff, toread, 1, filefd) != 1) extract_res = -4; /* write data chunk to dst file */
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if (fwrite(buff, toread, 1, filefd) != 1) extract_res = -4; /* write data chunk to dst file */
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i += toread;
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i += toread;
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}
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}
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} else if (curzipnode->compmethod == 8) { /* if the file is deflated, inflate it */
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} else if (curzipnode->compmethod == 8) { /* if the file is deflated, inflate it */
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/* use 1/3 of my buffer as input and 2/3 as output */
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extract_res = inf(zipfd, filefd, buff, &cksum, curzipnode->compressedfilelen);
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extract_res = inf(zipfd, filefd, buff, buffsize / 3, buff + (buffsize / 3), buffsize / 3 * 2, &cksum, curzipnode->compressedfilelen);
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}
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}
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/* clean up memory, close the dst file and terminates crc32 */
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/* clean up memory, close the dst file and terminates crc32 */
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free(buff);
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free(buff);
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fclose(filefd); /* close the dst file */
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fclose(filefd); /* close the dst file */
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/* Set the timestamp of the new file to what was set in the zip file */
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/* Set the timestamp of the new file to what was set in the zip file */
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filetimestamp.actime = curzipnode->timestamp;
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filetimestamp.actime = curzipnode->timestamp;
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filetimestamp.modtime = curzipnode->timestamp;
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filetimestamp.modtime = curzipnode->timestamp;
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utime(fulldestfilename, &filetimestamp);
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utime(fulldestfilename, &filetimestamp);
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return(0);
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return(0);
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#undef buffsize
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}
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}
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/* Call this to free a ziplist computed by zip_listfiles() */
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/* Call this to free a ziplist computed by zip_listfiles() */
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