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#define _LARGEFILE_SOURCE
#ifndef _FILE_OFFSET_BITS
#define _FILE_OFFSET_BITS 64
#endif
#include "mupdf/fitz.h"
#include "fitz-imp.h"
#include <string.h>
#include <errno.h>
#include <stdio.h>
int
fz_file_exists(fz_context *ctx, const char *path)
{
FILE *file;
#ifdef _WIN32
file = fz_fopen_utf8(path, "rb");
#else
file = fopen(path, "rb");
#endif
if (file)
fclose(file);
return !!file;
}
fz_stream *
fz_new_stream(fz_context *ctx, void *state, fz_stream_next_fn *next, fz_stream_drop_fn *drop)
{
fz_stream *stm = NULL;
fz_try(ctx)
{
stm = fz_malloc_struct(ctx, fz_stream);
}
fz_catch(ctx)
{
drop(ctx, state);
fz_rethrow(ctx);
}
stm->refs = 1;
stm->error = 0;
stm->eof = 0;
stm->pos = 0;
stm->bits = 0;
stm->avail = 0;
stm->rp = NULL;
stm->wp = NULL;
stm->state = state;
stm->next = next;
stm->drop = drop;
stm->seek = NULL;
return stm;
}
fz_stream *
fz_keep_stream(fz_context *ctx, fz_stream *stm)
{
return fz_keep_imp(ctx, stm, &stm->refs);
}
void
fz_drop_stream(fz_context *ctx, fz_stream *stm)
{
if (fz_drop_imp(ctx, stm, &stm->refs))
{
if (stm->drop)
stm->drop(ctx, stm->state);
fz_free(ctx, stm);
}
}
/* File stream */
// TODO: WIN32: HANDLE CreateFileW(), etc.
// TODO: POSIX: int creat(), read(), write(), lseeko, etc.
typedef struct fz_file_stream_s
{
FILE *file;
unsigned char buffer[4096];
} fz_file_stream;
static int next_file(fz_context *ctx, fz_stream *stm, size_t n)
{
fz_file_stream *state = stm->state;
/* n is only a hint, that we can safely ignore */
n = fread(state->buffer, 1, sizeof(state->buffer), state->file);
if (n < sizeof(state->buffer) && ferror(state->file))
fz_throw(ctx, FZ_ERROR_GENERIC, "read error: %s", strerror(errno));
stm->rp = state->buffer;
stm->wp = state->buffer + n;
stm->pos += (int64_t)n;
if (n == 0)
return EOF;
return *stm->rp++;
}
static void seek_file(fz_context *ctx, fz_stream *stm, int64_t offset, int whence)
{
fz_file_stream *state = stm->state;
#ifdef _WIN32
int64_t n = _fseeki64(state->file, offset, whence);
#else
int64_t n = fseeko(state->file, offset, whence);
#endif
if (n < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot seek: %s", strerror(errno));
#ifdef _WIN32
stm->pos = _ftelli64(state->file);
#else
stm->pos = ftello(state->file);
#endif
stm->rp = state->buffer;
stm->wp = state->buffer;
}
static void drop_file(fz_context *ctx, void *state_)
{
fz_file_stream *state = state_;
int n = fclose(state->file);
if (n < 0)
fz_warn(ctx, "close error: %s", strerror(errno));
fz_free(ctx, state);
}
static fz_stream *
fz_open_file_ptr(fz_context *ctx, FILE *file)
{
fz_stream *stm;
fz_file_stream *state = fz_malloc_struct(ctx, fz_file_stream);
state->file = file;
stm = fz_new_stream(ctx, state, next_file, drop_file);
stm->seek = seek_file;
return stm;
}
fz_stream *fz_open_file_ptr_no_close(fz_context *ctx, FILE *file)
{
fz_stream *stm = fz_open_file_ptr(ctx, file);
/* We don't own the file ptr. Ensure we don't close it */
stm->drop = NULL;
return stm;
}
fz_stream *
fz_open_file(fz_context *ctx, const char *name)
{
FILE *file;
#ifdef _WIN32
file = fz_fopen_utf8(name, "rb");
#else
file = fopen(name, "rb");
#endif
if (file == NULL)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open %s: %s", name, strerror(errno));
return fz_open_file_ptr(ctx, file);
}
#ifdef _WIN32
fz_stream *
fz_open_file_w(fz_context *ctx, const wchar_t *name)
{
FILE *file = _wfopen(name, L"rb");
if (file == NULL)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file %ls: %s", name, strerror(errno));
return fz_open_file_ptr(ctx, file);
}
#endif
/* Memory stream */
static int next_buffer(fz_context *ctx, fz_stream *stm, size_t max)
{
return EOF;
}
static void seek_buffer(fz_context *ctx, fz_stream *stm, int64_t offset, int whence)
{
int64_t pos = stm->pos - (stm->wp - stm->rp);
/* Convert to absolute pos */
if (whence == 1)
{
offset += pos; /* Was relative to current pos */
}
else if (whence == 2)
{
offset += stm->pos; /* Was relative to end */
}
if (offset < 0)
offset = 0;
if (offset > stm->pos)
offset = stm->pos;
stm->rp += (int)(offset - pos);
}
static void drop_buffer(fz_context *ctx, void *state_)
{
fz_buffer *state = (fz_buffer *)state_;
fz_drop_buffer(ctx, state);
}
fz_stream *
fz_open_buffer(fz_context *ctx, fz_buffer *buf)
{
fz_stream *stm;
fz_keep_buffer(ctx, buf);
stm = fz_new_stream(ctx, buf, next_buffer, drop_buffer);
stm->seek = seek_buffer;
stm->rp = buf->data;
stm->wp = buf->data + buf->len;
stm->pos = (int64_t)buf->len;
return stm;
}
fz_stream *
fz_open_memory(fz_context *ctx, const unsigned char *data, size_t len)
{
fz_stream *stm;
stm = fz_new_stream(ctx, NULL, next_buffer, NULL);
stm->seek = seek_buffer;
stm->rp = (unsigned char *)data;
stm->wp = (unsigned char *)data + len;
stm->pos = (int64_t)len;
return stm;
}
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