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126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef BR_BEARSSL_PEM_H__
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#define BR_BEARSSL_PEM_H__
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#include <stddef.h>
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#include <stdint.h>
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/*
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* Context for a PEM decoder.
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*/
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typedef struct {
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/* CPU for the T0 virtual machine. */
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struct {
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uint32_t *dp;
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uint32_t *rp;
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const unsigned char *ip;
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} cpu;
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uint32_t dp_stack[32];
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uint32_t rp_stack[32];
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int err;
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const unsigned char *hbuf;
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size_t hlen;
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void (*dest)(void *dest_ctx, const void *src, size_t len);
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void *dest_ctx;
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unsigned char event;
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char name[128];
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unsigned char buf[255];
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size_t ptr;
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} br_pem_decoder_context;
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/*
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* Initialise a PEM decoder structure.
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*/
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void br_pem_decoder_init(br_pem_decoder_context *ctx);
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/*
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* Push some bytes into the decoder. Returned value is the number of
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* bytes actually consumed; this may be less than the number of provided
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* bytes if an event is produced. When an event is produced, it must
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* be read (with br_pem_decoder_event()); until the event is read, this
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* function will return 0.
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*/
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size_t br_pem_decoder_push(br_pem_decoder_context *ctx,
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const void *data, size_t len);
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/*
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* Set the receiver for decoded data. The provided function (with opaque
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* context pointer) will be called with successive data chunks.
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*/
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static inline void
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br_pem_decoder_setdest(br_pem_decoder_context *ctx,
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void (*dest)(void *dest_ctx, const void *src, size_t len),
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void *dest_ctx)
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{
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ctx->dest = dest;
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ctx->dest_ctx = dest_ctx;
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}
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/*
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* Get the last event. This is 0 if no event has been produced. Calling
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* ths function clears the event and allows new source bytes to be
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* processed.
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*/
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int br_pem_decoder_event(br_pem_decoder_context *ctx);
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/*
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* This event is called when the start of a new object has been detected.
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* The object name (normalised to uppercase) can be accessed with
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* br_pem_decoder_name(). The caller MUST provide an appropriate receiver
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* (with br_pem_decoder_setdest()) before sending new data bytes.
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*/
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#define BR_PEM_BEGIN_OBJ 1
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/*
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* This event is called when the end of the current object is reached
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* (normally).
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*/
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#define BR_PEM_END_OBJ 2
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/*
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* This event is called when decoding fails while decoding an object.
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* This formally closes the current object and brings the decoder back
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* to the "out of any object" state. The offending line in the source
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* is consumed.
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*/
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#define BR_PEM_ERROR 3
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/*
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* Get the name of the encountered object. That name is normalised to
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* uppercase (for ASCII characters).
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*/
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static inline const char *
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br_pem_decoder_name(br_pem_decoder_context *ctx)
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{
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return ctx->name;
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}
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#endif
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