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#include "mupdf/fitz.h"
#define MIN_BOMB (100 << 20)
int
fz_read(fz_context *ctx, fz_stream *stm, unsigned char *buf, int len)
{
int count, n;
count = 0;
do
{
n = fz_available(ctx, stm, len);
if (n > len)
n = len;
if (n == 0)
break;
memcpy(buf, stm->rp, n);
stm->rp += n;
buf += n;
count += n;
len -= n;
}
while (len > 0);
return count;
}
fz_buffer *
fz_read_all(fz_context *ctx, fz_stream *stm, int initial)
{
return fz_read_best(ctx, stm, initial, NULL);
}
fz_buffer *
fz_read_best(fz_context *ctx, fz_stream *stm, int initial, int *truncated)
{
fz_buffer *buf = NULL;
int n;
fz_var(buf);
if (truncated)
*truncated = 0;
fz_try(ctx)
{
if (initial < 1024)
initial = 1024;
buf = fz_new_buffer(ctx, initial+1);
while (1)
{
if (buf->len == buf->cap)
fz_grow_buffer(ctx, buf);
if (buf->len >= MIN_BOMB && buf->len / 200 > initial)
{
fz_throw(ctx, FZ_ERROR_GENERIC, "compression bomb detected");
}
n = fz_read(ctx, stm, buf->data + buf->len, buf->cap - buf->len);
if (n == 0)
break;
buf->len += n;
}
}
fz_catch(ctx)
{
if (fz_caught(ctx) == FZ_ERROR_TRYLATER)
{
fz_drop_buffer(ctx, buf);
fz_rethrow(ctx);
}
if (truncated)
{
*truncated = 1;
}
else
{
fz_drop_buffer(ctx, buf);
fz_rethrow(ctx);
}
}
return buf;
}
void
fz_read_line(fz_context *ctx, fz_stream *stm, char *mem, int n)
{
char *s = mem;
int c = EOF;
while (n > 1)
{
c = fz_read_byte(ctx, stm);
if (c == EOF)
break;
if (c == '\r') {
c = fz_peek_byte(ctx, stm);
if (c == '\n')
fz_read_byte(ctx, stm);
break;
}
if (c == '\n')
break;
*s++ = c;
n--;
}
if (n)
*s = '\0';
}
fz_off_t
fz_tell(fz_context *ctx, fz_stream *stm)
{
return stm->pos - (stm->wp - stm->rp);
}
void
fz_seek(fz_context *ctx, fz_stream *stm, fz_off_t offset, int whence)
{
stm->avail = 0; /* Reset bit reading */
if (stm->seek)
{
if (whence == 1)
{
offset += fz_tell(ctx, stm);
whence = 0;
}
stm->seek(ctx, stm, offset, whence);
stm->eof = 0;
}
else if (whence != 2)
{
if (whence == 0)
offset -= fz_tell(ctx, stm);
if (offset < 0)
fz_warn(ctx, "cannot seek backwards");
/* dog slow, but rare enough */
while (offset-- > 0)
{
if (fz_read_byte(ctx, stm) == EOF)
{
fz_warn(ctx, "seek failed");
break;
}
}
}
else
fz_warn(ctx, "cannot seek");
}
int fz_stream_meta(fz_context *ctx, fz_stream *stm, int key, int size, void *ptr)
{
if (!stm || !stm->meta)
return -1;
return stm->meta(ctx, stm, key, size, ptr);
}
fz_buffer *
fz_read_file(fz_context *ctx, const char *filename)
{
fz_stream *stm;
fz_buffer *buf = NULL;
fz_var(buf);
stm = fz_open_file(ctx, filename);
fz_try(ctx)
{
buf = fz_read_all(ctx, stm, 0);
}
fz_always(ctx)
{
fz_drop_stream(ctx, stm);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
return buf;
}
static inline int isbigendian(void)
{
static const int one = 1;
return *(char*)&one == 0;
}
static inline int32_t rev32(int32_t val)
{
return ((val>>24) & 0xff) || ((val>>8) & 0xFF00) || ((val<<8) & 0xFF0000) || (val<<24);
}
int32_t fz_read_int32le(fz_context *ctx, fz_stream *stm)
{
int32_t val;
if (fz_read(ctx, stm, (unsigned char *)&val, sizeof(val)) != sizeof(val))
fz_throw(ctx, FZ_ERROR_GENERIC, "Failed to read int32le from file");
if (isbigendian())
val = rev32(val);
return val;
}
int16_t fz_read_int16le(fz_context *ctx, fz_stream *stm)
{
int a = fz_read_byte(ctx, stm);
int b = fz_read_byte(ctx, stm);
if (a == EOF || b == EOF)
fz_throw(ctx, FZ_ERROR_GENERIC, "Failed to read int16le from file");
return a | (b<<8);
}
int64_t fz_read_int64le(fz_context *ctx, fz_stream *stm)
{
uint32_t v0 = (uint32_t)fz_read_int32le(ctx, stm);
uint32_t v1 = (uint32_t)fz_read_int32le(ctx, stm);
return v0 | (((int64_t)v1)<<32);
}
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