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/*
* Copyright 2017 Vincent Sanders <vince@netsurf-browser.org>
*
* This file is part of libnspsl
*
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
*/
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdio.h>
#include <nspdf/errors.h>
#include "cos_parse.h"
#include "byte_class.h"
#include "cos_object.h"
#include "pdf_doc.h"
nspdferror
nspdf__stream_skip_ws(struct cos_stream *stream, strmoff_t *offset)
{
uint8_t c;
if ((*offset) >= stream->length) {
return NSPDFERROR_OK;
}
c = stream_byte(stream, *offset);
while (((*offset) < stream->length) &&
((bclass[c] & (BC_WSPC | BC_CMNT) ) != 0)) {
(*offset)++;
/* skip comments */
if (((*offset) < stream->length) &&
((bclass[c] & BC_CMNT) != 0)) {
c = stream_byte(stream, *offset);
while ((*offset < stream->length) &&
((bclass[c] & BC_EOLM ) == 0)) {
(*offset)++;
c = stream_byte(stream, (*offset));
}
}
c = stream_byte(stream, (*offset));
}
return NSPDFERROR_OK;
}
/**
* move offset to next non eol byte
*/
nspdferror
nspdf__stream_skip_eol(struct cos_stream *stream, strmoff_t *offset)
{
uint8_t c;
/** \todo sort out keeping offset in range */
c = stream_byte(stream, *offset);
while ((bclass[c] & BC_EOLM) != 0) {
(*offset)++;
c = stream_byte(stream, *offset);
}
return NSPDFERROR_OK;
}
nspdferror
nspdf__stream_read_uint(struct cos_stream *stream,
strmoff_t *offset_out,
uint64_t *result_out)
{
uint8_t c; /* current byte from source data */
strmoff_t offset; /* current offset of source data */
unsigned int len; /* number of decimal places in number */
uint8_t num[21]; /* temporary buffer for decimal values */
uint64_t result=0; /* parsed result */
uint64_t tens;
offset = *offset_out;
for (len = 0; len < sizeof(num); len++) {
c = stream_byte(stream, offset);
if ((bclass[c] & BC_DCML) != BC_DCML) {
if (len == 0) {
return -2; /* parse error no decimals in input */
}
/* sum value from each place */
for (tens = 1; len > 0; tens = tens * 10, len--) {
result += (num[len - 1] * tens);
}
*offset_out = offset;
*result_out = result;
return NSPDFERROR_OK;
}
num[len] = c - '0';
offset++;
}
return NSPDFERROR_RANGE; /* number too long */
}
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