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/*
* Copyright 2016 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "writer.h"
#include <assert.h>
#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#define ERROR0(msg) fprintf(stderr, "%s:%d: " msg, __FILE__, __LINE__)
#define ERROR(fmt, ...) \
fprintf(stderr, "%s:%d: " fmt, __FILE__, __LINE__, __VA_ARGS__)
#define INITIAL_OUTPUT_BUFFER_CAPACITY (64 * 1024)
static WasmResult write_data_to_file(size_t offset,
const void* data,
size_t size,
void* user_data) {
if (size == 0)
return WASM_OK;
WasmFileWriter* writer = user_data;
if (offset != writer->offset) {
if (fseek(writer->file, offset, SEEK_SET) != 0) {
ERROR("fseek offset=%" PRIzd " failed, errno=%d\n", size, errno);
return WASM_ERROR;
}
writer->offset = offset;
}
if (fwrite(data, size, 1, writer->file) != 1) {
ERROR("fwrite size=%" PRIzd " failed, errno=%d\n", size, errno);
return WASM_ERROR;
}
writer->offset += size;
return WASM_OK;
}
static WasmResult move_data_in_file(size_t dst_offset,
size_t src_offset,
size_t size,
void* user_data) {
if (size == 0)
return WASM_OK;
/* TODO(binji): implement if needed. */
ERROR0("move_data_in_file not implemented!\n");
return WASM_ERROR;
}
void wasm_init_file_writer_existing(WasmFileWriter* writer, FILE* file) {
WASM_ZERO_MEMORY(*writer);
writer->file = file;
writer->offset = 0;
writer->base.user_data = writer;
writer->base.write_data = write_data_to_file;
writer->base.move_data = move_data_in_file;
}
WasmResult wasm_init_file_writer(WasmFileWriter* writer, const char* filename) {
FILE* file = fopen(filename, "wb");
if (!file) {
ERROR("fopen name=\"%s\" failed, errno=%d\n", filename, errno);
return WASM_ERROR;
}
wasm_init_file_writer_existing(writer, file);
return WASM_OK;
}
void wasm_close_file_writer(WasmFileWriter* writer) {
fclose(writer->file);
}
void wasm_init_output_buffer(WasmAllocator* allocator,
WasmOutputBuffer* buf,
size_t initial_capacity) {
assert(initial_capacity != 0);
buf->allocator = allocator;
buf->start = wasm_alloc(allocator, initial_capacity, WASM_DEFAULT_ALIGN);
buf->size = 0;
buf->capacity = initial_capacity;
}
static void ensure_output_buffer_capacity(WasmOutputBuffer* buf,
size_t ensure_capacity) {
if (ensure_capacity > buf->capacity) {
assert(buf->capacity != 0);
size_t new_capacity = buf->capacity * 2;
while (new_capacity < ensure_capacity)
new_capacity *= 2;
buf->start = wasm_realloc(buf->allocator, buf->start, new_capacity,
WASM_DEFAULT_ALIGN);
buf->capacity = new_capacity;
}
}
static WasmResult write_data_to_output_buffer(size_t offset,
const void* data,
size_t size,
void* user_data) {
WasmMemoryWriter* writer = user_data;
size_t end = offset + size;
ensure_output_buffer_capacity(&writer->buf, end);
memcpy((void*)((size_t)writer->buf.start + offset), data, size);
if (end > writer->buf.size)
writer->buf.size = end;
return WASM_OK;
}
static WasmResult move_data_in_output_buffer(size_t dst_offset,
size_t src_offset,
size_t size,
void* user_data) {
WasmMemoryWriter* writer = user_data;
size_t src_end = src_offset + size;
size_t dst_end = dst_offset + size;
size_t end = src_end > dst_end ? src_end : dst_end;
ensure_output_buffer_capacity(&writer->buf, end);
void* dst = (void*)((size_t)writer->buf.start + dst_offset);
void* src = (void*)((size_t)writer->buf.start + src_offset);
memmove(dst, src, size);
if (end > writer->buf.size)
writer->buf.size = end;
return WASM_OK;
}
WasmResult wasm_init_mem_writer(WasmAllocator* allocator,
WasmMemoryWriter* writer) {
WASM_ZERO_MEMORY(*writer);
writer->base.user_data = writer;
writer->base.write_data = write_data_to_output_buffer;
writer->base.move_data = move_data_in_output_buffer;
wasm_init_output_buffer(allocator, &writer->buf,
INITIAL_OUTPUT_BUFFER_CAPACITY);
return WASM_OK;
}
WasmResult wasm_init_mem_writer_existing(WasmMemoryWriter* writer,
WasmOutputBuffer* buf) {
WASM_ZERO_MEMORY(*writer);
writer->base.user_data = writer;
writer->base.write_data = write_data_to_output_buffer;
writer->base.move_data = move_data_in_output_buffer;
writer->buf = *buf;
/* Clear buffer, since ownership has passed to the writer. */
WASM_ZERO_MEMORY(*buf);
return WASM_OK;
}
void wasm_steal_mem_writer_output_buffer(WasmMemoryWriter* writer,
WasmOutputBuffer* out_buf) {
*out_buf= writer->buf;
writer->buf.start = NULL;
writer->buf.size = 0;
writer->buf.capacity = 0;
}
void wasm_close_mem_writer(WasmMemoryWriter* writer) {
wasm_destroy_output_buffer(&writer->buf);
}
WasmResult wasm_write_output_buffer_to_file(WasmOutputBuffer* buf,
const char* filename) {
FILE* file = fopen(filename, "wb");
if (!file) {
ERROR("unable to open %s for writing\n", filename);
return WASM_ERROR;
}
ssize_t bytes = fwrite(buf->start, 1, buf->size, file);
if (bytes < 0 || (size_t)bytes != buf->size) {
ERROR("failed to write %" PRIzd " bytes to %s\n", buf->size, filename);
return WASM_ERROR;
}
fclose(file);
return WASM_OK;
}
void wasm_destroy_output_buffer(WasmOutputBuffer* buf) {
if (buf->allocator)
wasm_free(buf->allocator, buf->start);
}
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