static l_int32
gifWriteFunc(GifFileType *gif, const GifByteType *src, l_int32 bytesToWrite)
{
L_BBUFFER *buffer;
PROCNAME("gifWriteFunc");
if ((buffer = (L_BBUFFER*)gif->UserData) == NULL)
return ERROR_INT("UserData not set", procName, -1);
if(bbufferRead(buffer, (l_uint8*)src, bytesToWrite) == 0)
return bytesToWrite;
return 0;
}
/*!
* zlibUncompress()
*
* Input: datain (byte buffer with compressed input data)
* nin (number of bytes of input data)
* &nout (<return> number of bytes of output data)
* Return: dataout (uncompressed data), or null on error
*
* Notes:
* (1) See zlibCompress().
*/
l_uint8 *
zlibUncompress(l_uint8 *datain,
size_t nin,
size_t *pnout)
{
l_uint8 *dataout;
l_uint8 *bufferin, *bufferout;
l_int32 status;
size_t nbytes;
BBUFFER *bbin, *bbout;
z_stream z;
PROCNAME("zlibUncompress");
if (!datain)
return (l_uint8 *)ERROR_PTR("datain not defined", procName, NULL);
if ((bufferin = (l_uint8 *)CALLOC(L_BUF_SIZE, sizeof(l_uint8))) == NULL)
return (l_uint8 *)ERROR_PTR("bufferin not made", procName, NULL);
if ((bufferout = (l_uint8 *)CALLOC(L_BUF_SIZE, sizeof(l_uint8))) == NULL)
return (l_uint8 *)ERROR_PTR("bufferout not made", procName, NULL);
if ((bbin = bbufferCreate(datain, nin)) == NULL)
return (l_uint8 *)ERROR_PTR("bbin not made", procName, NULL);
if ((bbout = bbufferCreate(NULL, 0)) == NULL)
return (l_uint8 *)ERROR_PTR("bbout not made", procName, NULL);
z.zalloc = (alloc_func)0;
z.zfree = (free_func)0;
z.next_in = bufferin;
z.avail_in = 0;
z.next_out = bufferout;
z.avail_out = L_BUF_SIZE;
inflateInit(&z);
for ( ; ; ) {
if (z.avail_in == 0) {
z.next_in = bufferin;
bbufferWrite(bbin, bufferin, L_BUF_SIZE, &nbytes);
/* fprintf(stderr, " wrote %d bytes to bufferin\n", nbytes); */
z.avail_in = nbytes;
}
if (z.avail_in == 0)
break;
status = inflate(&z, Z_SYNC_FLUSH);
/* fprintf(stderr, " status is %d, bytesleft = %d, totalout = %d\n",
status, z.avail_out, z.total_out); */
nbytes = L_BUF_SIZE - z.avail_out;
if (nbytes) {
bbufferRead(bbout, bufferout, nbytes);
/* fprintf(stderr, " read %d bytes from bufferout\n", nbytes); */
}
z.next_out = bufferout;
z.avail_out = L_BUF_SIZE;
}
inflateEnd(&z);
bbufferDestroy(&bbin);
dataout = bbufferDestroyAndSaveData(&bbout, pnout);
FREE(bufferin);
FREE(bufferout);
return dataout;
}
/*!
* zlibCompress()
*
* Input: datain (byte buffer with input data)
* nin (number of bytes of input data)
* &nout (<return> number of bytes of output data)
* Return: dataout (compressed data), or null on error
*
* Notes:
* (1) We repeatedly read in and fill up an input buffer,
* compress the data, and read it back out. zlib
* uses two byte buffers internally in the z_stream
* data structure. We use the bbuffers to feed data
* into the fixed bufferin, and feed it out of bufferout,
* in the same way that a pair of streams would normally
* be used if the data were being read from one file
* and written to another. This is done iteratively,
* compressing L_BUF_SIZE bytes of input data at a time.
*/
l_uint8 *
zlibCompress(l_uint8 *datain,
size_t nin,
size_t *pnout)
{
l_uint8 *dataout;
l_int32 status;
l_int32 flush;
size_t nbytes;
l_uint8 *bufferin, *bufferout;
BBUFFER *bbin, *bbout;
z_stream z;
PROCNAME("zlibCompress");
if (!datain)
return (l_uint8 *)ERROR_PTR("datain not defined", procName, NULL);
/* Set up fixed size buffers used in z_stream */
if ((bufferin = (l_uint8 *)CALLOC(L_BUF_SIZE, sizeof(l_uint8))) == NULL)
return (l_uint8 *)ERROR_PTR("bufferin not made", procName, NULL);
if ((bufferout = (l_uint8 *)CALLOC(L_BUF_SIZE, sizeof(l_uint8))) == NULL)
return (l_uint8 *)ERROR_PTR("bufferout not made", procName, NULL);
/* Set up bbuffers and load bbin with the data */
if ((bbin = bbufferCreate(datain, nin)) == NULL)
return (l_uint8 *)ERROR_PTR("bbin not made", procName, NULL);
if ((bbout = bbufferCreate(NULL, 0)) == NULL)
return (l_uint8 *)ERROR_PTR("bbout not made", procName, NULL);
z.zalloc = (alloc_func)0;
z.zfree = (free_func)0;
z.opaque = (voidpf)0;
z.next_in = bufferin;
z.avail_in = 0;
z.next_out = bufferout;
z.avail_out = L_BUF_SIZE;
status = deflateInit(&z, ZLIB_COMPRESSION_LEVEL);
if (status != Z_OK)
return (l_uint8 *)ERROR_PTR("deflateInit failed", procName, NULL);
do {
if (z.avail_in == 0) {
z.next_in = bufferin;
bbufferWrite(bbin, bufferin, L_BUF_SIZE, &nbytes);
#if DEBUG
fprintf(stderr, " wrote %d bytes to bufferin\n", nbytes);
#endif /* DEBUG */
z.avail_in = nbytes;
}
flush = (bbin->n) ? Z_SYNC_FLUSH : Z_FINISH;
status = deflate(&z, flush);
#if DEBUG
fprintf(stderr, " status is %d, bytesleft = %d, totalout = %d\n",
status, z.avail_out, z.total_out);
#endif /* DEBUG */
nbytes = L_BUF_SIZE - z.avail_out;
if (nbytes) {
bbufferRead(bbout, bufferout, nbytes);
#if DEBUG
fprintf(stderr, " read %d bytes from bufferout\n", nbytes);
#endif /* DEBUG */
}
z.next_out = bufferout;
z.avail_out = L_BUF_SIZE;
} while (flush != Z_FINISH);
deflateEnd(&z);
bbufferDestroy(&bbin);
dataout = bbufferDestroyAndSaveData(&bbout, pnout);
FREE(bufferin);
FREE(bufferout);
return dataout;
}
main(int argc,
char **argv)
{
char *filein, *fileout;
l_uint8 *array1, *array2, *dataout, *dataout2;
l_int32 i, blocksize;
size_t nbytes, nout, nout2;
BBUFFER *bb, *bb2;
FILE *fp;
static char mainName[] = "buffertest";
if (argc != 3)
exit(ERROR_INT(" Syntax: buffertest filein fileout", mainName, 1));
filein = argv[1];
fileout = argv[2];
if ((array1 = l_binaryRead(filein, &nbytes)) == NULL)
exit(ERROR_INT("array not made", mainName, 1));
fprintf(stderr, " Bytes read from file: %ld\n", nbytes);
/* Application of byte buffer ops: compress/decompress in memory */
#if 1
dataout = zlibCompress(array1, nbytes, &nout);
l_binaryWrite(fileout, "w", dataout, nout);
dataout2 = zlibUncompress(dataout, nout, &nout2);
l_binaryWrite("/tmp/junktest", "w", dataout2, nout2);
fprintf(stderr,
"nbytes in = %ld, nbytes comp = %ld, nbytes uncomp = %ld\n",
nbytes, nout, nout2);
lept_free(dataout);
lept_free(dataout2);
#endif
/* Low-level byte buffer read/write test */
#if 0
bb = bbufferCreate(array1, nbytes);
bbufferRead(bb, array1, nbytes);
array2 = (l_uint8 *)lept_calloc(2 * nbytes, sizeof(l_uint8));
fprintf(stderr, " Bytes initially in buffer: %d\n", bb->n);
blocksize = (2 * nbytes) / NBLOCKS;
for (i = 0; i <= NBLOCKS; i++) {
bbufferWrite(bb, array2, blocksize, &nout);
fprintf(stderr, " block %d: wrote %d bytes\n", i + 1, nout);
}
fprintf(stderr, " Bytes left in buffer: %d\n", bb->n);
bb2 = bbufferCreate(NULL, 0);
bbufferRead(bb2, array1, nbytes);
fp = lept_fopen(fileout, "wb");
bbufferWriteStream(bb2, fp, nbytes, &nout);
fprintf(stderr, " bytes written out to fileout: %d\n", nout);
bbufferDestroy(&bb);
bbufferDestroy(&bb2);
lept_free(array2);
#endif
lept_free(array1);
return 0;
}
