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Update ZIP container writing to update the lengths and CRC-32 values of

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streamed files.
This commit is contained in:
Michael Sweet 2017-04-07 11:50:34 -04:00
parent ece51b6223
commit 6f32f8b4fa
1 changed files with 15 additions and 6 deletions
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21
zipc.c
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@ -615,7 +615,7 @@ zipcOpen(const char *filename, /* I - Filename of container */
* Open the container file...
*/
if ((zc->fp = fopen(filename, "wb")) == NULL)
if ((zc->fp = fopen(filename, "w+b")) == NULL)
{
free(zc);
return (NULL);
@ -776,16 +776,12 @@ zipc_write_local_header(
zipc_file_t *zf) /* I - ZIP container file */
{
int status = 0; /* Return status */
unsigned flags = zf->flags; /* General purpose flags */
size_t filenamelen = strlen(zf->filename);
/* Length of filename */
if (zf->uncompressed_size == 0 && zf->external_attrs != ZIPC_EXTERNAL_DIR)
flags |= ZIPC_FLAG_DATA;
status |= zipc_write_u32(zc, ZIPC_LOCAL_HEADER);
status |= zipc_write_u16(zc, zf->external_attrs == ZIPC_EXTERNAL_DIR ? ZIPC_DIR_VERSION : ZIPC_FILE_VERSION);
status |= zipc_write_u16(zc, flags);
status |= zipc_write_u16(zc, zf->flags);
status |= zipc_write_u16(zc, zf->method);
status |= zipc_write_u32(zc, zc->modtime);
status |= zipc_write_u32(zc, zf->uncompressed_size == 0 ? 0 : zf->crc32);
@ -809,12 +805,25 @@ zipc_write_local_trailer(
zipc_file_t *zf) /* I - ZIP container file */
{
int status = 0; /* Return status */
long pos = ftell(zc->fp); /* Position in file */
/*
* Update the CRC-32, compressed size, and uncompressed size fields...
*/
fseek(zc->fp, zf->offset + 14, SEEK_SET);
status |= zipc_write_u32(zc, zf->crc32);
status |= zipc_write_u32(zc, (unsigned)zf->compressed_size);
status |= zipc_write_u32(zc, (unsigned)zf->uncompressed_size);
/*
* Go back to the end of the file...
*/
fseek(zc->fp, pos, SEEK_SET);
return (status);
}