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/*
* Miscellaneous I/O functions
*/
#include "fitz_base.h"
#include "fitz_stream.h"
/*
* Read a line terminated by LF or CR or CRLF.
*/
fz_error
fz_readline(fz_stream *stm, char *mem, int n)
{
fz_error error;
char *s = mem;
int c = EOF;
while (n > 1)
{
c = fz_readbyte(stm);
if (c == EOF)
break;
if (c == '\r') {
c = fz_peekbyte(stm);
if (c == '\n')
c = fz_readbyte(stm);
break;
}
if (c == '\n')
break;
*s++ = c;
n--;
}
if (n)
*s = '\0';
error = fz_readerror(stm);
if (error)
return fz_rethrow(error, "cannot read line");
return fz_okay;
}
static inline int fz_fillbuf(fz_stream *stm, fz_buffer *buf)
{
int remaining = buf->ep - buf->wp;
int available = stm->buffer->wp - stm->buffer->rp;
if (available == 0)
{
int c = fz_readbytex(stm);
if (c == EOF)
return EOF;
*buf->wp++ = c;
remaining = buf->ep - buf->wp;
available = stm->buffer->wp - stm->buffer->rp;
}
memmove(buf->wp, stm->buffer->rp, MIN(remaining, available));
buf->wp += MIN(remaining, available);
stm->buffer->rp += MIN(remaining, available);
if (buf->rp == buf->wp && stm->buffer->eof)
return EOF;
return 0;
}
/*
* Utility function to consume all the contents of an input stream into
* a freshly allocated buffer.
*/
fz_error
fz_readall(fz_buffer **bufp, fz_stream *stm, int sizehint)
{
fz_error error;
fz_buffer *buf;
if (sizehint == 0)
sizehint = 4 * 1024;
error = fz_newbuffer(&buf, sizehint);
if (error)
return fz_rethrow(error, "cannot create scratch buffer");
while (fz_fillbuf(stm, buf) != EOF)
{
if (buf->wp == buf->ep)
{
error = fz_growbuffer(buf);
if (error)
{
fz_dropbuffer(buf);
return fz_rethrow(error, "cannot resize scratch buffer");
}
}
}
*bufp = buf;
return fz_okay;
}
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