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Make stream lookahead work; simplify the interface

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This commit is contained in:
Eric Fischer 2018-05-11 16:02:53 -07:00
parent 9f7dc4b46d
commit 14b618adc9
1 changed files with 32 additions and 9 deletions
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41
main.cpp
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@ -486,6 +486,7 @@ struct STREAM {
bool gz;
z_stream inflate_s;
Bytef buf[BUF];
std::vector<unsigned char> ahead;
int fclose() {
if (gz) {
@ -498,18 +499,40 @@ struct STREAM {
}
int peekc() {
int c = getc(fp);
if (c != EOF) {
ungetc(c, fp);
if (gz) {
if (ahead.size() > 0) {
return ahead[ahead.size() - 1];
}
char tmp[1];
size_t nread = read(tmp, 1);
if (nread == 0) {
return EOF;
}
ahead.push_back(tmp[0]);
return (unsigned char) tmp[0];
} else {
int c = getc(fp);
if (c != EOF) {
ungetc(c, fp);
}
return c;
}
return c;
}
int fread(char *out, size_t unit, size_t count) {
size_t read(char *out, size_t count) {
if (gz) {
if (ahead.size() > 0 && count > 0) {
out[0] = ahead[ahead.size() - 1];
ahead.resize(ahead.size() - 1);
return 1;
}
while (1) {
prime();
inflate_s.avail_out = count * unit;
inflate_s.avail_out = count;
inflate_s.next_out = (Bytef *) out;
int ret = inflate(&inflate_s, Z_SYNC_FLUSH);
@ -529,7 +552,7 @@ struct STREAM {
}
}
} else {
return ::fread(out, unit, count, fp);
return ::fread(out, 1, count, fp);
}
}
@ -551,7 +574,7 @@ struct STREAM {
};
static ssize_t read_stream(json_pull *j, char *buffer, size_t n) {
return ((STREAM *) j->source)->fread(buffer, 1, n);
return ((STREAM *) j->source)->read(buffer, n);
}
STREAM *streamfdopen(int fd, const char *mode, std::string const &fname) {
@ -1592,7 +1615,7 @@ int read_input(std::vector<source> &sources, char *fname, int maxzoom, int minzo
char buf[READ_BUF];
int n;
while ((n = fp->fread(buf, sizeof(char), READ_BUF)) > 0) {
while ((n = fp->read(buf, READ_BUF)) > 0) {
fwrite_check(buf, sizeof(char), n, readfp, reading.c_str());
ahead += n;