pdfio/pdfio-stream.c
2021-05-01 22:38:11 -04:00

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//
// PDF stream functions for pdfio.
//
// Copyright © 2021 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
//
// Include necessary headers...
//
#include "pdfio-private.h"
//
// 'pdfioStreamClose()' - Close a (data) stream in a PDF file.
//
bool // O - `true` on success, `false` on failure
pdfioStreamClose(pdfio_stream_t *st) // I - Stream
{
// TODO: Implement me
(void)st;
return (false);
}
//
// 'pdfioStreamConsume()' - Consume bytes from the stream.
//
bool // O - `true` on success, `false` on EOF
pdfioStreamConsume(pdfio_stream_t *st, // I - Stream
size_t bytes)// I - Number of bytes to consume
{
// TODO: Implement me
(void)st;
(void)bytes;
return (false);
}
//
// '_pdfioStreamDelete()' - Free all memory used by a stream.
//
void
_pdfioStreamDelete(pdfio_stream_t *st) // I - Stream
{
if (st->filter == PDFIO_FILTER_FLATE)
{
// Free memory used for flate compression/decompression...
if (st->pdf->mode == _PDFIO_MODE_READ)
inflateEnd(&st->flate);
else // mode == _PDFIO_MODE_WRITE
deflateEnd(&st->flate);
}
free(st);
}
//
// 'pdfioStreamGetToken()' - Read a single PDF token from a stream.
//
bool // O - `true` on success, `false` on EOF
pdfioStreamGetToken(
pdfio_stream_t *st, // I - Stream
char *buffer, // I - String buffer
size_t bufsize) // I - Size of string buffer
{
return (_pdfioTokenRead(st->pdf, buffer, bufsize, (_pdfio_tpeek_cb_t)pdfioStreamPeek, (_pdfio_tconsume_cb_t)pdfioStreamConsume, st));
}
//
// 'pdfioStreamPeek()' - Peek at data in a stream.
//
ssize_t // O - Bytes returned or `-1` on error
pdfioStreamPeek(pdfio_stream_t *st, // I - Stream
void *buffer, // I - Buffer
size_t bytes) // I - Size of buffer
{
// TODO: Implement me
(void)st;
(void)buffer;
(void)bytes;
return (-1);
}
//
// 'pdfioStreamPrintf()' - Write a formatted string to a stream.
//
bool // O - `true` on success, `false` on failure
pdfioStreamPrintf(
pdfio_stream_t *st, // I - Stream
const char *format, // I - `printf`-style format string
...) // I - Additional arguments as needed
{
char buffer[8192]; // String buffer
va_list ap; // Argument pointer
// Format the string...
va_start(ap, format);
vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
// Write the string...
return (pdfioStreamWrite(st, buffer, strlen(buffer)));
}
//
// 'pdfioStreamPuts()' - Write a literal string to a stream.
//
bool // O - `true` on success, `false` on failure
pdfioStreamPuts(pdfio_stream_t *st, // I - Stream
const char *s) // I - Literal string
{
if (!st || !s)
return (false);
else
return (pdfioStreamWrite(st, s, strlen(s)));
}
//
// 'pdfioStreamRead()' - Read data from a stream.
//
ssize_t // O - Number of bytes read or `-1` on error
pdfioStreamRead(
pdfio_stream_t *st, // I - Stream
void *buffer, // I - Buffer
size_t bytes) // I - Bytes to read
{
// TODO: Implement me
(void)st;
(void)buffer;
(void)bytes;
return (-1);
}
//
// 'pdfioStreamWrite()' - Write data to a stream.
//
bool // O - `true` on success or `false` on failure
pdfioStreamWrite(
pdfio_stream_t *st, // I - Stream
const void *buffer, // I - Data to write
size_t bytes) // I - Number of bytes to write
{
// TODO: Implement me
(void)st;
(void)buffer;
(void)bytes;
return (false);
}